JP2019067413A - Transmission side computer, reception side computer, method performed by the same, and computer program - Google Patents

Abstract

To display an image displayed on a display provided in a transmission side computer on a display provided in a reception side computer for each pointer.SOLUTION: A communication system comprises a transmission side computer, a communication device, and a reception side computer. The transmission side computer transmits image data generated by capturing an image displayed on its display every several frames and positional data indicating coordinates of a pointer at that time point to the communication device. The communication device transmits those by use of a wireless LAN function to the reception side computer. The reception side computer generates a composite image which is an image composite displaying a pointer at a position determined by the positional data on an image by the image data, and displays it on the display.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a technique for displaying an image displayed on a display connected to a transmitting computer that is a first computer or connected to a transmitting computer on a display that a receiving computer that is a second computer has About.

  For example, in a presentation in a conference, a projector is generally used. When giving a presentation, the presenter projects a desired image on a screen or the like from a projector connected to a laptop computer or the like. An audience present at the meeting listens and sees the presenter's presentation while watching the projected image.

By the way, in the method of the conference as described above, an audience at a distance from the projected image may not see the image well. Such problems are likely to occur particularly when the image contains small characters.
In consideration of such a thing, the conference may distribute in advance a handout which is a printout of at least a part of the image to be projected to the audience. In such cases, the audience will listen to and watch the presentation, with occasional attention to the handouts. However, if such a presentation method is adopted, a paper called a handout is required. Depending on the number of people in the audience, the time and cost of making such handouts, and the time and effort of distributing handouts are not foolish.

Therefore, the inventor of the present invention considered.
Notebook computers have been popular for a long time, but the degree of widespread use of portable terminals such as smartphones and tablets is tremendous. One person is commonplace no longer.
And if the same image as the image currently displayed on the notebook type personal computer etc. which the presenter who makes a presentation uses is displayed on such a portable terminal, the above-mentioned subject may be able to be solved at once. If the same image as the image displayed on the notebook computer or the like used by the presenter is displayed on the screen of the portable terminal at hand of the audience, even if the audience is far from the image projected from the projector, The problem of difficulty in seeing that the displayed image is difficult to see hardly occurs.
Further, if the same image as the image displayed on the notebook computer or the like used by the presenter is displayed on the screen of the portable terminal, it is not necessary to distribute the paper distribution material. Moreover, if the audience can store the data of the image displayed on the display of the portable terminal on the portable terminal, the need to distribute the distribution material will be less and less.

  And if such a mechanism is made, the application is not limited to "the alternative to the conventional projector" in the scene of the conference as described above, for example, performing a play, watching a concert, or playing sports It is possible to disseminate desired information to visitors from one notebook computer or the like to the visitors watching the game. This is like a "small-scale, simplified version of the television broadcasting system", and if such a mechanism is born, it may be able to stimulate entirely new demand.

The inventor of the present invention is provided with the first computer, the transmitting computer which can at least be used for the above-mentioned "alternative to the conventional projector", or displayed on a display connected to the transmitting computer. We started to develop a system to provide a technology for displaying a second image on the display of the second computer, the receiving computer.
However, a problem arose.
The above-mentioned system may have other specifications, but roughly speaking, the image data obtained by capturing the image displayed on the display of the transmitting computer is compressed into compressed data with a small amount of data, The compressed data is transmitted to the receiving computer via the wireless LAN, and the image data obtained by decompressing the compressed data by the receiving computer is displayed on the display of the receiving computer.
However, simply capturing the image displayed on the display for obtaining the image data by the transmitting computer does not include the data of the pointer displayed on the display of the transmitting computer. It will be. If this system is used for presentation, it is essential to display a pointer for guiding the audience's gaze on the display of the receiving computer, and the presence or absence may affect the success or failure of the presentation. is there.
This is not limited to the case where there are a large number of receiving computers with respect to one sending computer, and the same applies when the sending computer and the receiving computer are one to one.

  In the present invention, a pointer is included in a display provided in a receiving computer, which is a second computer, including an image displayed on a display connected to the transmitting computer, which is a first computer, or connected to the transmitting computer. It is an object of the present invention to provide a technique for enabling display.

The inventor of the present invention proposes the following invention in order to solve the above-mentioned problems.
The present invention is easy to understand when grasped in the first to sixth inventions.

The first invention of the present application is used by being connected to a transmitting computer which is a computer having a display or connected to a display, and communicates with a receiving computer which is a computer having a display via a wireless LAN. It is a communication device that can be done.
Then, this communication apparatus is for one screen captured by dropping a frame from a display image which is an image displayed on the first display which is the display that the transmitting computer has or is connected to the transmitting computer. Acceptance of receiving image data, which is image data, and position data, which is data for specifying the position of the pointer displayed on the first display on the first display, from the transmitting computer at a predetermined timing Means, compression means for compressing the image data into a predetermined format, and the compressed data and the position data are transmitted to the receiving computer at predetermined time intervals using a wireless LAN function. Transmitting means, and the receiving computer which has received the compressed data, The compressed data is expanded into the image data, and a composite image, which is an image obtained by synthetically displaying a pointer at the position specified by the position data of the display image, is displayed on the second display as a display. It is supposed to be possible.

As in the case of the other inventions, the communication apparatus of the first invention is used in connection with the sending computer as described above. The sending computer is, for example, a computer provided with a display, such as a notebook computer, or connected to the display, for example, a desktop computer. The transmitting computer corresponds to a personal computer operated by the presenter if a presentation is to be performed.
The communication apparatus according to the first aspect of the present invention is, in many cases, the same image as the display image which is an image displayed on the first display which is a display included in the transmitting computer or connected to the transmitting computer. Data to be displayed on a second display, which is a display included in the receiving computer corresponding to the portable terminal described in the technical field, is transmitted to the receiving computer.
Thus, the communication system including the transmitting computer, the receiving computer, and the communication device of the present application can be applied to the "replacement of the conventional projector", and when there are a plurality of receiving computers, It will function as a small, simplified version of the television broadcast system.
More specifically, the communication system is a transmitting computer which is a computer having a display or connected to a display, and a receiving computer which is used in connection with the transmitting computer and which has a display. A communication system including: a communication apparatus configured to be able to communicate with the reception side computer via a wireless LAN.
Then, the communication device of this communication system is one captured from a display image which is an image displayed on the first display which is the display that the transmission side computer has or is connected to the transmission side computer Image data, which is image data of a screen, and position data, which is data for specifying the position on the first display of the pointer displayed on the first display, are transmitted from the transmitting computer to the predetermined timing. Using the function of the wireless LAN, receiving computer at a predetermined time interval using the function of the wireless LAN, and receiving means for accepting the data, compression means for converting the image data into compressed data into a predetermined format, and using the function of the wireless LAN Transmitting means for transmitting to the receiving side, and the receiving side receiving the compressed data. The computer is a display provided with a composite image which is an image obtained by decompressing the compressed data into the image data and combining and displaying a pointer at a position specified by the position data of the display image. It is supposed to be able to display on a display.
Transmission of data from the above-described communication apparatus to the receiving computer is realized using the transmission function of the wireless LAN. The portable terminal, which often becomes the receiving computer, has the function of the wireless LAN first of all, so that the receiving computer can receive the above data without difficulty. In addition, if a communication apparatus is equipped with a wireless LAN function, the communication function of the wireless LAN includes, from the beginning, a function of transmitting data on a one-to-one basis as well as a one-to-many basis. There is no difficulty in sending data to the receiving computer. The wireless LAN is, for example, Wi-Fi. The same applies to the following inventions, but the simultaneous communication function by wireless LAN is simultaneously 253 by default if it is Wi-Fi (when 8-bit data is used for identification data) Or, 65533 units (when using 16 bits of data for identification data) can be communicated wirelessly with a computer, and the communication distance depends on the performance of the antenna for communication, but the number It is possible from ten meters to several hundred meters.
However, there is also a limitation by using a wireless LAN without using a special communication method. That is, it is difficult to increase the communication speed in the communication between the communication device and the receiving computer as compared to the communication between the transmitting computer and the communication device, which may be wired communication.
The communication apparatus according to the present application captures data for a display image, which is an image displayed on the first display that is a display that the transmitting computer has or is connected to the transmitting computer, from the transmitting computer, The image data is generated by the image data, and the image data is compressed by the compression means, and the compressed data, which is the image data after compression, is sent to the receiving computer. The compressed data is, of course, smaller than the data before compression. As a result, the slow communication speed due to the communication by the wireless LAN does not cause a major problem.
The compression performed by the compression means may be any known image compression, such as JPEG compression or MPEG compression.
By the way, as described above, even if the image displayed on the first display is captured, the pointer displayed on the first display is not included in the captured image. Therefore, in the present invention, position data for specifying the position of the pointer on the first display at the moment of capturing the image displayed on the first display is acquired by the transmitting computer, and is acquired via the communication device. Sending to the receiving computer. The receiving computer receiving the compressed data receives the position data to decompress the compressed data into image data, and an image in which a pointer is synthesized and displayed at the position specified by the position data of the image according to the image data. Can be generated. Then, since the composite image can be displayed on the second display, a pointer is included in the image displayed on the second display of the first invention.
Communication between the communication apparatus and the receiving computer in the first invention is performed using a wireless LAN as described above. This communication is very compatible with the technology using UDP (User Datagram Protocol). Unlike TCP (Transmission Control Protocol), which is a well-known communication protocol, along with UDP, UDP is a protocol that enables not only one-to-one communication but also one-to-many communication from a transmitting device to a receiving device. Also, UDP has the disadvantage of low reliability of communication, but instead has high communication speed. Although this is compressed and the capacity is reduced, it is likely that the present invention for transmitting image data from the communication device to the receiving computer, and particularly for the case where the present invention is applied for presentation It's perfect for situations where you need to have one-to-many communication. From such a point of view, it is preferable to use UDP for communication using the above-mentioned wireless LAN. This point is that each communication using the wireless LAN used in the second to sixth inventions (in the case of the fifth and sixth inventions, not between the communication apparatus and the receiving computer but the transmitting computer and the receiving computer Communication between the side computers).

The inventor of the present invention also proposes a method to be executed by the communication apparatus of the first invention to produce the same operation and effect as the communication apparatus of the first invention of the present application.
The method is used by connecting to a transmitting computer which is a computer having a display or connected to a display, and performs communication via a wireless LAN with a receiving computer which is a computer having a display. It is a method that is performed by a communication device that is enabled.
And the method is captured by dropping a frame from a display image which is an image displayed on a first display which is executed by the communication device, which is the display possessed by or connected to the transmitting computer. Image data, which is data of an image for one screen, and position data, which is data for specifying a position on the first display of the pointer displayed on the first display, are predetermined from the transmission side computer Receiving the data at a predetermined timing, compressing the image data into compressed data into a predetermined format, receiving the compressed data and the position data at predetermined time intervals using a wireless LAN function Sending the data to the receiving computer, and receiving the compressed data. The computer decompresses the compressed data into the image data, and is a display including a composite image which is an image obtained by synthetically displaying a pointer at a position specified by the position data of the image according to the image data. It can be displayed on the second display.

The inventor of the present invention also proposes a computer program for causing a computer to function as the communication device of the first invention, as producing the same operation and effect as the communication device of the first invention of the present application.
The computer program is used by being connected to a transmitting computer which is a computer having a display or connected to a display, and performs communication via a wireless LAN with a receiving computer which is a computer having a display. Is a computer program for causing a computer, which is able to
Then, the computer program drops a frame from a display image which is an image displayed on the first display which is a display that the transmitting computer has or is connected to the transmitting computer to the computer included in the communication device. Image data which is data of one screen of captured image data, and position data which is data for specifying a position on the first display of the pointer displayed on the first display, the transmitting side A reception process for receiving from a computer at a predetermined timing, a compression process for converting the image data into compressed data into a predetermined format, the compressed data and the position data using a wireless LAN function for a predetermined time Sending the sending process to the receiving computer at intervals And the receiving computer which has received the compressed data decompresses the compressed data into the image data and compositely displays a pointer at a position specified by the position data of the image according to the image data. The composite image, which is an image, can be displayed on a second display, which is a display that it comprises.

The second invention of the present application is used by being connected to a transmitting computer which is a computer having a display or connected to a display, and communicates with a receiving computer which is a computer having a display via a wireless LAN. It is a communication device that can be done.
Then, the communication device is captured by dropping a frame from a display image which is an image displayed on the first display which is the display which the transmitting side computer has or is connected to the transmitting side computer. A compression unit that compresses image data, which is data of an image for one screen, into compressed data, and a position that is data that specifies the position on the first display of the pointer displayed on the first display A receiving unit for receiving the compressed data and the position data from the transmitting computer at a predetermined timing, and the position data generating unit for generating the data; , Transmission using the wireless LAN function to the receiving computer at predetermined time intervals And the receiving computer which has received the compressed data decompresses the compressed data into the image data, and a pointer at a position specified by the position data of the image according to the image data. The composite image, which is an image obtained by combining and displaying, can be displayed on a second display, which is a display provided with it.
The communication apparatus according to the first aspect of the invention receives image data and position data from the transmitting computer, and compresses the image data by itself to make compressed data. On the other hand, the communication apparatus according to the second aspect of the present invention receives compressed data and position data, which are already compressed image data, from the transmitting computer. Since the communication apparatus of the second invention can send compressed data and position data to the receiving computer, the receiving computer which communicates with the communication apparatus of the second invention also uses the second display in the case of the first invention The same image can be displayed. That is, the same effects as in the case of the first invention can be obtained by the communication device of the second invention.

The inventor of the present invention also proposes a method to be executed by the communication apparatus of the second invention, in order to produce the same effect as the communication apparatus of the second invention.
The method is used by connecting to a transmitting computer which is a computer having a display or connected to a display, and performs communication via a wireless LAN with a receiving computer which is a computer having a display. It is a method that is performed by a communication device that is enabled.
And the method is carried out by the communication apparatus from the display image which is an image displayed on the first display which is the display which the transmitting side computer has or is connected to the transmitting side computer. Compression means for compressing image data, which is image data of one screen, captured by dropping a frame into compressed data, and a position of the pointer displayed on the first display on the first display A reception process for receiving the compressed data and the position data from the transmitting computer at a predetermined timing when the apparatus has position data generating means for generating position data which is data to be specified; and the compressed data And the position data on the receiving side at predetermined time intervals using the wireless LAN function. Transmitting the data to the image data, the receiving computer receiving the compressed data decompresses the compressed data into the image data, and the position data of the image according to the image data A composite image, which is an image in which a pointer is composited and displayed at a specified position, can be displayed on a second display, which is a display provided with it.

The inventor of the present invention also proposes a computer program for causing a computer to function as the communication device of the second aspect of the present invention to produce the same operation and effect as the communication device of the second aspect of the present invention.
The computer program is used by being connected to a transmitting computer which is a computer having a display or connected to a display, and performs communication via a wireless LAN with a receiving computer which is a computer having a display. Is a computer program for causing a computer, which is able to
The computer program is an image displayed on a first display, which is a display included in the transmitting computer or connected to the transmitting computer, on the computer included in the communication device. Compression means for compressing image data, which is image data of one screen, captured by dropping a frame from a display image into compressed data, and the first display of the pointer displayed on the first display A reception process for receiving the compressed data and the position data from the transmission side computer at a predetermined timing when the position data generation means for generating position data which is data for specifying the position of Using the function of a wireless LAN with the compressed data and the position data And a transmitting step of transmitting the data to the receiving computer at predetermined time intervals, and the receiving computer which has received the compressed data decompresses the compressed data into the image data. A composite image, which is an image obtained by combining and displaying a pointer at a position specified by the position data of the image according to the image data, can be displayed on a second display as a display.

As another aspect of the second invention, the inventor of the present invention proposes the following communication system which can obtain the same effect as that of the first invention.
The communication system includes a transmitting computer which is a computer having a display or is connected to a display, a receiving computer which is used by being connected to the transmitting computer and which is a computer having a display, and the receiving side. A communication system including a computer and a communication device capable of performing communication via a wireless LAN, wherein the communication device is the transmitting computer, the transmitting computer has, or the transmitting computer has. Compress the image data, which is the image data of one screen captured by dropping the frame from the display image, which is the image displayed on the first display, which is the display connected to the host computer, into compressed data Means, and displayed on the first display The position data generating means for generating position data which is data for specifying the position of the pointer on the first display, the compressed data and the position data are transmitted from the transmitting computer. It comprises: reception means for receiving at predetermined timing; and transmission means for transmitting the compressed data and the position data to the receiving computer at predetermined time intervals using the function of the wireless LAN, the compressed data The receiving computer, which has received the command, decompresses the compressed data to obtain the image data, and a composite image which is an image in which a pointer is synthetically displayed at the position specified by the position data of the image according to the image data. A communication system that is supposed to be able to display on a second display that is a display that it comprises .

The inventor of the present invention proposes the following receiving computer which can obtain the same effect as that of the first invention as another aspect of the first invention and the second invention.
The receiving computer is a receiving computer that communicates with the communication device according to the first and second inventions, the second receiving means receiving the second display, the compressed data, and the position data, and A composite image, which is an image obtained by combining and displaying a pointer at a position specified by the position data of the image based on the image data, on the display image based on the image data, and decompression means for decompressing compressed data to return to image data. A receiving computer having display means for displaying on a second display which is a display that it comprises.
The display means of the receiving computer compositely displays a pointer on the display image based on the one image data at a position specified by a plurality of position data received until the next image data of the image data is received. The plurality of composite images may be displayed on the second display a plurality of times. The receiving computer receives the compressed data and the position data. Here, compressed data is created based on image data. Here, the image data is created by dropping a frame from a display image which is an image displayed on the first display. That is, the speed of updating the image data is slower than the number of frames of the display image displayed on the first display. On the other hand, position data can be generated from all the frames of the display image being displayed on the first display. The position data for the coordinates is far smaller than the image data and compressed data, so the frame captured for generating the image data in the display image which is a moving image displayed on the first display Also, even if it is supposed to be generated from all the frames of the display image, for example, from all the frames of the display image and delivered to the receiving computer, it is performed using the wireless LAN between the communication device and the receiving computer. The burden on communications is not too big. In such a case, the receiving computer will receive position data from the communication device more, in other words more often, than the compressed data. At that time, the receiving computer receives the position data at the same time as or after receiving the certain compressed data as described above, and then receives the next compressed data after receiving at least one position data. The receiving computer can then use the position data received upon receiving one compressed data and all of the several position data received prior to receiving the next compressed data for pointer drawing. That is, until one image by image data obtained by decompressing compressed data is used as a background and drawing by an image by the next image data is performed, a composite image is generated by combining a pointer with one image data, Is displayed on the second display, and a composite image in which the same image data is combined with the pointer whose position is specified by the next position data is created and displayed on the second display, and the same image data is displayed on the next position data. It is possible to repeat the processing of creating a composite image in which the position-specified pointers are combined and displaying it on the second display until the timing of drawing with the next image data. By doing this, the update speed (the number of frames) of the drawing of the image based on the image data and the update speed (the number of frames) of the pointer in the second display are made different, more precisely the latter is made faster Is possible. Since the image provided by the software for presentation is mostly a still image, there is no problem in reducing the update speed of drawing the image on the second display, but the pointer often moves violently. If the update speed is slow, the pointer will move and become unsightly, but if the pointer update speed is increased, such a problem will not occur.

The inventor of the present invention also proposes a method to be executed by the receiving computer of the first invention and the second invention, as producing the same effect as the receiving computer of the first invention and the second invention.
The method is performed by a receiving computer having a second display in communication with the communication device according to the first invention or the second invention, the compressed data being executed by the receiving computer, and A second accepting step of accepting position data, an expanding step of decompressing the compressed data to return it to image data, and a position specified by the position data of the image by the image data in the display image based on the image data Displaying a composite image, which is an image obtained by combining and displaying the pointer, on a second display, which is a display provided with the pointer.

In order to produce the same function and effect as the receiving side computers of the first and second inventions, the inventor of the present application has a computer program for causing the computer to function as the receiving side computers of the first and second inventions. suggest.
A second receiving step of receiving the compressed data and the position data in a computer included in a receiving computer having a second display, the computer program communicating with the communication device according to the first invention or the second invention; Combining the compressed data and decompressing the compressed data back to image data; and combining the image by displaying a pointer at the position specified by the position data of the image based on the image data on the display image based on the image data. Displaying the image on a second display, which is a display that it comprises.

As another aspect of the second invention, the inventor of the present invention also proposes the following transmission side computer which can obtain the same effect as that of the first invention.
The transmission side computer is a transmission side computer which communicates with the communication apparatus of the second invention, and the image for one screen captured by dropping a frame from a display image which is an image displayed on the first display Compression means for compressing image data, which is data of the above, into compressed data, and position data for generating position data, which is data for specifying the position on the first display of the pointer displayed on the first display A transmitting computer comprising: generating means; and means for transmitting the compressed data and the position data to the communication device.

The inventor of the present invention also proposes a method to be executed by the sending computer of the second invention, which produces the same effect as the sending computer of the second invention of the present application.
The method is a method executed by a transmitting computer in communication with the communication device of the second invention, wherein the transmitting computer executes a frame from a display image which is an image displayed on the first display. And compressing the image data, which is the data of the image captured for one screen, into compressed data, and specifying the position on the first display of the pointer displayed on the first display The method includes: generating position data as data; and transmitting the compressed data and the position data to the communication device.

The inventor of the present invention also proposes a computer program for causing a computer to function as a transmission side computer according to the second aspect of the present invention, in order to produce the same effect as the transmission side computer according to the second aspect of the present invention.
The computer program is a computer program for causing a computer to function as a transmitting computer that communicates with the communication device of the second invention, and is displayed on the first display on the computer of the transmitting computer. A process of compressing image data which is data of an image of one screen captured by dropping a frame from a display image which is an image into compressed data, and the first display of the pointer displayed on the first display A computer program that causes a process of generating position data, which is data specifying an upper position, and a process of transmitting the compressed data and the position data to the communication device. .

The third invention of the present application is used by being connected to a transmitting computer which is a computer having a display or connected to a display, and communicates with a receiving computer which is a computer having a display via a wireless LAN. It is a communication device that can be done.
Then, this communication apparatus is for one screen captured by dropping a frame from a display image which is an image displayed on the first display which is the display that the transmitting computer has or is connected to the transmitting computer. Acceptance of receiving image data, which is image data, and position data, which is data for specifying the position of the pointer displayed on the first display on the first display, from the transmitting computer at a predetermined timing And compression means for compressing the composite image, which is an image obtained by combining and displaying a pointer at a position specified by the position data of the image corresponding to the image data, into a predetermined format; Transmission means for transmitting to the receiving computer at predetermined time intervals using the wireless LAN function , And the receiving computer receiving the compressed data decompresses the compressed data, and the image is synthesized and displayed as a pointer at the position specified by the position data of the image according to the image data. It is assumed that the image can be displayed on a second display which is a display provided with the image.
This communication device also receives image data and pointer position data from the sending computer. However, the communication apparatus according to the first aspect of the present invention sends compressed data obtained by compressing image data and position data to the receiving computer and combines the image and pointer with the image data obtained by expanding the compressed data to the receiving computer. It was decided to make a composite image. Instead, the communication apparatus of the third invention is to create a composite image by itself, compress it, and send it to the receiving computer. The receiving computer can obtain composite image data only by decompressing the compressed data, and can therefore display the composite image on the second display. That is, according to the third aspect of the invention, the same function and effect as the first aspect of the invention can be obtained.

The inventor of the present invention also proposes a method to be executed by the communication device of the third aspect of the present invention, in order to produce the same effect as that of the communication device of the third aspect of the present invention.
The method is used by connecting to a transmitting computer which is a computer having a display or connected to a display, and performs communication via a wireless LAN with a receiving computer which is a computer having a display. It is a method that is performed by a communication device that is enabled.
And the method is captured by dropping a frame from a display image which is an image displayed on a first display which is executed by the communication device, which is the display possessed by or connected to the transmitting computer. Image data which is data of an image for one screen, and position data which is data for specifying a position on the first display, which is displayed on the first display, are predetermined from the transmission side computer A process of accepting at a timing, a process of compressing the composite image, which is an image obtained by combining and displaying a pointer at a position specified by the position data of the image corresponding to the image data, into compressed data having a predetermined format; The compressed data is sent to the receiving computer at predetermined time intervals using the wireless LAN function. And the receiving computer receiving the compressed data decompresses the compressed data to compositely display a pointer at a position specified by the position data of the image according to the image data. The composite image is a composite image, which can be displayed on a second display as a display.

The inventor of the present invention also proposes a computer program for causing a computer to function as the communication device of the third aspect of the present invention as producing the same operation and effect as the communication device of the third aspect of the present invention.
The computer program is used by being connected to a transmitting computer which is a computer having a display or connected to a display, and performs communication via a wireless LAN with a receiving computer which is a computer having a display. Is a computer program for causing a computer, which is able to
Then, the computer program drops a frame from a display image which is an image displayed on the first display which is a display that the transmitting computer has or is connected to the transmitting computer to the computer included in the communication device. Image data which is data of one screen of captured image data, and position data which is data for specifying a position on the first display of the pointer displayed on the first display, the transmitting side An acceptance process accepted from a computer at a predetermined timing, and compression to generate a composite image, which is an image obtained by combining and displaying a pointer at a position specified by the position data of an image corresponding to the image data, into compressed data Process and the compressed data, using the function of the wireless LAN, And a transmitting step of transmitting the data to the receiving computer at a time interval, and the receiving computer which has received the compressed data decompresses the compressed data, and the image based on the image data is decompressed. The synthesized image is an image obtained by synthesizing and displaying the pointer at the position specified by the position data, and the image can be displayed on the second display, which is a display included in the image.

As another aspect of the third invention, the inventor of the present invention proposes the following communication system which can obtain the same effect as that of the first invention.
The communication system includes a transmitting computer which is a computer having a display or is connected to a display, a receiving computer which is used by being connected to the transmitting computer and which is a computer having a display, and the receiving side. A communication system including a computer and a communication device capable of performing communication via a wireless LAN, wherein the communication device is included in the transmission side computer or connected to the transmission side computer. Image data which is data of an image of one screen captured by dropping a frame from a display image which is an image displayed on a first display which is a display, and the first of the pointers displayed on the first display 1 Data for specifying the position on the display Reception means for receiving certain position data from the transmission side computer at a predetermined timing, and a composite image which is an image obtained by combining and displaying a pointer at the position specified by the position data of the image corresponding to the image data A compression unit configured to compress compressed data into a format, and a transmission unit configured to transmit the compressed data to the receiving computer at predetermined time intervals using a wireless LAN function, and receive the compressed data The receiving computer decompresses the compressed data to form a composite image which is an image obtained by synthetically displaying a pointer at the position specified by the position data of the image according to the image data, and the image is provided with the display It is a communication system which is supposed to be able to display on a certain second display.

As another aspect of the first invention and the third invention, the inventor of the present invention also proposes the following transmission side computer which can obtain the same effect as that of the first invention.
The transmission side computer is a transmission side computer which communicates with the communication device according to the first invention and the third invention, and has a first display or is connected to the first display and displayed on the first display Image data which is data of an image of one screen captured by dropping a frame from a display image which is an image, and a position on the first display of the pointer displayed on the first display Means for transmitting position data, which is data, to the communication device.

The inventor of the present invention also proposes a method to be executed by the sending computer of the first invention and the third invention, as producing the same effect as the sending computer of the first invention and the third invention of the present application.
The method is a method executed by a sending computer in communication with the communication device according to the first invention or the third invention, which is an image displayed on the first display, executed by the sending computer. Image data which is data of an image of one screen captured by dropping a frame from a display image, and position data which is data specifying the position on the first display of the pointer displayed on the first display And transmitting to the communication device.

In order to produce the same function and effect as the sending side computers of the first and third inventions of the present application, the inventor of the present invention has a computer program for causing the computer to function as the sending side computer of the first and third inventions. suggest.
The computer program is a computer program for causing a computer to function as a transmitting computer that communicates with the communication device according to the first invention or the third invention, wherein the computer of the transmitting computer is connected to the first display. Image data which is data of an image of one screen captured by dropping a frame from a display image which is a displayed image, and the position of the pointer displayed on the first display on the first display It is a computer program configured to execute a process of transmitting the position data, which is data to be specified, to the communication device.

A fourth invention is used by connecting to a transmitting computer which is a computer having a display or connected to a display, and performs communication via a wireless LAN with a receiving computer which is a computer having a display. Is a communication device that is designed to
Then, the communication device is captured by dropping a frame from a display image which is an image displayed on the first display which is the display which the transmitting side computer has or is connected to the transmitting side computer. It is an image obtained by combining and displaying a pointer displayed on the first display when an image corresponding to the image data is displayed on the first display with image data which is data of an image for one screen. A receiving unit for receiving the compressed data from the transmitting side computer at a predetermined timing, and a compression unit for receiving the compressed data when the composite image is compressed into a predetermined format; And transmission means for transmitting to the receiving computer at predetermined time intervals using the function. The receiving computer which has received the compressed data decompresses the compressed data to form a composite image which is an image in which a pointer is synthesized and displayed at a position specified by the position data of the image by the image data, It is supposed that the image can be displayed on the second display which is the display that it comprises.
In the first aspect of the invention, the receiving computer used in combination with the communication device combines the image by the image data and the pointer to create a combined image. On the other hand, in the second aspect of the invention, the communication device combines the image based on the image data and the pointer to create a combined image. In the fourth aspect of the invention, the transmitting computer combines the image based on the image data and the pointer to create a composite image. In the fourth aspect of the invention, data obtained by compressing the data of the composite image passes from the transmitting computer to the communication device and from the communication device to the receiving computer. Since the receiving computer can obtain composite image data by decompressing this compressed data, the receiving computer that communicates with the communication device of the fourth invention displays the same image as that of the first invention on its second display. become able to. That is, the same effects as those of the first invention can be obtained by the communication device of the fourth invention.

The inventor of the present invention also proposes a method to be executed by the communication device of the fourth aspect of the present invention, as it produces the same effect as the communication device of the fourth aspect of the present invention.
The method is used by connecting to a transmitting computer which is a computer having a display or connected to a display, and performs communication via a wireless LAN with a receiving computer which is a computer having a display. It is a method that is performed by a communication device that is enabled.
And the method is carried out by the communication apparatus from the display image which is an image displayed on the first display which is the display which the transmitting side computer has or is connected to the transmitting side computer. Image data, which is data of an image of one screen captured by dropping a frame, is a pointer displayed on the first display when the image corresponding to the image data is displayed on the first display. A receiving step of receiving the compressed data from the transmitting computer at a predetermined timing when the image forming apparatus has compression means for converting the composite image, which is a composite image, into a predetermined format; Data is sent to the receiving computer at predetermined time intervals using the function of the wireless LAN An image in which the receiving computer which has received the compressed data decompresses the compressed data and compositely displays a pointer at a position specified by the position data of the image according to the image data. And a second display, which is a display with which the image is provided.

The inventor of the present invention also proposes a computer program for causing a computer to function as the communication device of the fourth aspect of the present invention to produce the same function and effect as the communication device of the fourth aspect of the present invention.
The computer program is used by being connected to a transmitting computer which is a computer having a display or connected to a display, and performs communication via a wireless LAN with a receiving computer which is a computer having a display. Is a computer program for causing a computer, which is able to
The computer program is an image displayed on a first display, which is a display included in the transmitting computer or connected to the transmitting computer, on the computer included in the communication device. The image corresponding to the image data is displayed on the first display when the image corresponding to the image data is displayed on the first display in image data which is data of an image of one screen captured by dropping a frame from the display image A reception process for receiving the compressed data from the transmitting computer at a predetermined timing when the image forming apparatus has compression means for converting the composite image, which is an image obtained by composite display, into compressed data having a predetermined format; , The compressed data, using a wireless LAN function, a predetermined time And the transmitting process of transmitting to the receiving computer at different intervals, the receiving computer having received the compressed data decompressing the compressed data, and the position data of the image according to the image data The pointer is composited and displayed at the position specified in (1), and the image is made to be able to be displayed on the second display which is the display provided.

As another aspect of the fourth invention, the inventor of the present invention proposes the following communication system which can obtain the same effect as that of the first invention.
The communication system includes a transmitting computer which is a computer having a display or is connected to a display, a receiving computer which is used by being connected to the transmitting computer and which is a computer having a display, and the receiving side. A communication system including a computer and a communication device configured to be able to communicate via a wireless LAN, wherein the communication device is the transmitting computer, the transmitting computer has, or The image data corresponds to image data which is data of an image of one screen captured by dropping a frame from a display image which is an image displayed on a first display which is a display connected to a transmission side computer An image is displayed on the first display And transmitting the compressed data to the transmitting side when the compressed data is provided as compressed data obtained by compressing the pointer displayed on the first display into a predetermined format. Reception means for receiving from the computer at a predetermined timing, and transmission means for transmitting the compressed data to the receiving computer at predetermined time intervals using a wireless LAN function, and the compressed data is received The receiving computer decompresses the compressed data to form a composite image which is an image obtained by combining and displaying a pointer at a position specified by the position data of the image according to the image data, and the image is provided with the image It is a communication system which is supposed to be able to display on the second display.

As another aspect of the third invention and the fourth invention, the inventor of the present invention also proposes the following receiving computer which can obtain the same effect as that of the first invention.
The receiving computer is a receiving computer that communicates with the communication device according to the third and fourth inventions, wherein the second display, the second receiving unit for receiving the compressed data, and the compressed data are expanded. The display image includes decompression means for returning data of a composite image in which a pointer is composited and displayed at a position specified by the position data of the image according to the image data, and the display image includes the position data of the image according to the image data And a display means for displaying a composite image, which is an image obtained by combining and displaying a pointer at a specified position, on a second display, which is a display provided with the composite image.

The inventors of the present invention also propose a method to be executed by the receiving computer of the third invention and the fourth invention, as to produce the same effect as the receiving computer of the third invention and the fourth invention of the present application.
The method is performed by a receiving computer having a second display in communication with the communication device according to the third invention or the fourth invention, wherein the receiving computer receives the compressed data. (2) an accepting process, and an expanding process for decompressing the compressed data and returning to the display image data of a composite image which is an image obtained by synthetically displaying a pointer at a position specified by the position data of the image according to the image data; Displaying a composite image, which is an image obtained by combining and displaying a pointer at a position specified by the position data of the image according to the image data, in the display image, on a second display as a display thereof. Is the way.

In order to produce the same function and effect as the receiving side computers of the third and fourth inventions of the present application, the inventor of the present application has a computer program for causing the computer to function as the receiving side computers of the third and fourth inventions suggest.
The computer program decompresses the compressed data, a second accepting step of accepting the compressed data to a computer included in a receiving computer having a second display, which communicates with the communication device according to the third invention or the fourth invention. Then, the display image is expanded into data of a composite image which is an image obtained by combining and displaying a pointer at a position specified by the position data of the image according to the image data, and the image according to the image data as the display image And displaying the combined image, which is an image obtained by combining and displaying the pointer at the position specified by the position data, on the second display that is the display provided with the computer program.

As another aspect of the fourth invention, the inventor of the present invention also proposes the following transmission side computer which can obtain the same effect as that of the first invention.
The transmission side computer is a transmission side computer which communicates with the communication apparatus of the fourth invention, and the image for one screen captured by dropping a frame from a display image which is an image displayed on the first display The image data, which is data of a predetermined format, is a composite image that is a composite image of the pointer displayed on the first display when the image corresponding to the image data is displayed on the first display. A transmitting computer comprising: compression means for converting compressed data into compressed data; and means for transmitting the compressed data to the communication device.

The inventor of the present invention also proposes a method to be executed by the sending computer of the fourth invention, which produces the same effect as the sending computer of the fourth invention of the present application.
The method is a method executed by a transmitting computer in communication with the communication device of the fourth invention, wherein the transmitting computer executes a frame from a display image which is an image displayed on the first display. The image data, which is data of an image of one screen captured by dropping the image, is combined with the pointer displayed on the first display when the image corresponding to the image data is displayed on the first display. The method may include the steps of: setting a composite image, which is a displayed image, into compressed data compressed into a predetermined format; and transmitting the compressed data to the communication device.

The inventor of the present invention also proposes a computer program for causing a computer to function as a transmission side computer according to the fourth aspect of the present invention, in order to produce the same effect as the transmission side computer according to the fourth aspect of the present invention.
The computer program is a computer program for causing a computer to function as a transmitting computer that communicates with the communication device of the fourth invention, and is displayed on the first display on the computer of the transmitting computer. When an image corresponding to the image data is displayed on the first display in image data which is data of an image of one screen captured by dropping a frame from a display image which is an image on the first display A process of making a composite image which is an image obtained by combining and displaying the displayed pointer into compressed data compressed into a predetermined format and a process of transmitting the compressed data to the communication device are executed. It is a computer program.

In the receiving computer according to any one of the first to fourth aspects of the invention, the communication device receives the compressed data, and the receiving computer decompresses the compressed data into the image data, and the image by the image data It is possible to change specification information for specifying software for enabling display of a composite image, which is an image obtained by combining and displaying a pointer at a position specified by the position data, on a second display, which is a display provided with the pointer. When it is configured, the receiving computer may include an input unit for inputting at least a part of the designation information.
Generally, various protocols are implemented in computers that communicate. Then, among the protocols, some computers that transmit data can specify which software installed in the computer that receives the data should process the transmitted data. When the communication apparatus of the present invention can perform such specification, it is possible to specify which software installed in the receiving computer is to process compressed data by specifying information designating the software. it can. In particular, in the case where the communication apparatus can change the designation information, and the receiving computer includes an input unit for inputting at least a part of the specification information, the communication apparatus can change the designation information. And the receiving computer has correctly input at least a part of the designated information, and the compressed data sent from the communication device to the receiving computer is processed by the received software installed in the receiving computer. Can be processed as planned. Conversely, when at least a part of the designation information is not correctly input at the receiving computer, the receiving computer does not display a display image based on the compressed data on the second display. That is, assuming that there are a plurality of computers that can be the receiving computer in the communication range from the communication device, those that should function as the receiving computer (those that cause the display image to be displayed on the second display) There may be a mixture of those that should not function as the receiving computer (those that should not display the display image on the second display). In such a case, only a user having a computer to function as a receiving computer can verbally notify correct information about at least a part of the specified information, and at least a part of the specified information can be received by the receiving computer By causing the computer to be input to be input, only the computer to be functioned as the receiving computer can be functioned as the receiving computer. This roughly means that only the person who wants to show the same image displayed on the first display can be shown. The designation information in this case is, for example, UDP (User Datagram Protocol).

The following contents are defeated in the first invention and the second invention.
The transmission means of the communication device may simultaneously transmit the compressed data and the position data to the plurality of receiving computers. By doing so, in the case where the communication system including the communication device of the present application is applied to "a substitute for a conventional projector", it can cope with a plurality of audiences, and "small scale, simple It is possible to apply the version to the "TV broadcasting system".
The following contents apply to all of the first to fourth inventions.
The transmission means of the communication apparatus may simultaneously transmit the compressed data to the plurality of receiving computers. This serves to cause the communication system including the communication device of the present application to function as a "small-scale, simplified version of the television broadcasting system".
The transmission of data such as image data from the transmitting computer to the communication apparatus may be performed in any manner. For example, this transmission may be wired or wireless, but wired transmission may be suitable in the sense that there is no speed limitation. As an example of wired transmission, data transmission using a USB terminal can be mentioned. For example, the reception unit of the communication apparatus may be a USB terminal, and may be connected to a USB terminal of the transmission side computer. The sending computer is often a laptop computer or a desktop computer, and may be a portable terminal, but in any case, since these are often equipped with a USB terminal, such a configuration There is a good possibility that there is no inconvenience in adopting
Of course, data about an image (image data or compressed data) is intermittently sent from the sending computer to the receiving computer. These data may be sent at predetermined intervals, whether they are constant or not, for example, data of several frames to several tens of frames per second. The predetermined interval may or may not be a constant interval.
The communication device may include a projector device that projects the display image. For example, presentation can be realized using this communication device while projecting a display image with the projector device.

A fifth invention of the present application is a receiving side computer which is a computer having a display, and a transmitting side which is a computer having a display or connected to a display, which can communicate via a wireless LAN. It is a computer.
Then, the transmitting computer is a screen captured by dropping a frame from a display image which is an image displayed on a first display which is a display that the transmitting computer has or is connected to the transmitting computer. Compression means for converting image data, which is image data, into compressed data in a predetermined format, and position data, which is data for specifying the position on the first display of the pointer displayed on the first display And transmitting means for transmitting the compressed data and the position data to the receiving computer at predetermined time intervals using the function of the wireless LAN, and the compressed data When the receiving computer that has received the image data decompresses the compressed data into the image data. In addition, a composite image, which is an image obtained by combining and displaying a pointer at a position specified by the position data of an image based on the image data, can be displayed on a second display as a display. .
The transmitting computer sends compressed data obtained by compressing image data and position data to the receiving computer using the function of the wireless LAN by itself without using a communication device. From the viewpoint of the receiving computer, it is the same as the first and second inventions to receive. Therefore, the receiving computer can display on its second display the same image as displayed on the second display of the receiving computer used in combination with the first and second inventions. That is, the same effects as those of the first invention can be obtained by the communication device of the fifth invention.

The inventor of the present invention also proposes a method to be executed by the sending computer of the fifth invention, which produces the same effect as the sending computer of the fifth invention of the present application.
The method consists of a receiving computer being a computer having a display and a transmitting computer being able to communicate via a wireless LAN, having a display or being a computer connected to a display. It is the method to be performed.
Then, the method captures a frame from a display image which is an image displayed on a first display which is executed by the transmitting computer, which is a display that the transmitting computer has or is connected to the transmitting computer. A compression process for converting image data, which is data of one screen of image data, into compressed data compressed into a predetermined format, and specifying a position on the first display of the pointer displayed on the first display Including a position data generation process of generating position data which is data, and a transmission process of transmitting the compressed data and the position data to the receiving computer at predetermined time intervals using a wireless LAN function. And the receiving computer receiving the compressed data decompresses the compressed data to With the image data, the composite image is an image obtained by synthesizing and displaying the pointer on the position specified by the position data of the image by the image data, so that it can be displayed on the second display is a display with.

The inventor of the present invention also proposes a computer program for causing a computer to function as a transmission side computer according to the fifth aspect of the present invention as producing the same operation and effect as the communication device according to the fifth aspect of the present invention.
The computer program includes, as a transmitting computer, a receiving computer, which is a computer having a display, and a computer having a display or connected to the display, capable of communicating via a wireless LAN. It is a computer program to make it function.
Then, the computer program causes the computer included in the transmitting computer to display a frame from a display image which is an image displayed on the first display which is a display that the transmitting computer has or is connected to the transmitting computer. A compression process for converting image data, which is data of one screen of captured image data, into compressed data compressed into a predetermined format, and a position of the pointer displayed on the first display on the first display A position data generation process for generating position data which is data specifying the transmission data, and a transmission process for transmitting the compressed data and the position data to the receiving computer at predetermined time intervals using the function of the wireless LAN; To receive the compressed data. While the compressed data is decompressed into the image data by the side computer, a display provided with a composite image which is an image obtained by synthetically displaying a pointer at the position specified by the position data of the image based on the image data It can be displayed on a second display.

As another aspect of the fifth invention, the inventor of the present invention also proposes the following receiving computer which can obtain the same effect as that of the first invention.
The receiving computer is a receiving computer that communicates with the transmitting computer according to the fifth aspect of the invention, and includes a second display, second receiving means for receiving the compressed data, and the position data, and the compressed data. A composite image, which is an image obtained by combining and displaying a pointer at a position specified by the position data of the image based on the image data, on the display image based on the image data, and decompression means for decompressing and returning to image data And a display means for displaying on a second display, which is a display provided.
The display means of the receiving computer compositely displays a pointer on the display image based on the one image data at a position specified by a plurality of position data received until the next image data of the image data is received. The plurality of composite images may be displayed on the second display a plurality of times. Thereby, the same effects as those in the case where the receiving computers of the first and second inventions are obtained can be obtained.

The inventor of the present invention also proposes a method to be executed by the receiving computer of the fifth invention, which produces the same effect as the receiving computer of the fifth invention of the present application.
The method is a method executed by a receiving computer having a second display, which communicates with the transmitting computer according to the fifth aspect of the invention, wherein the compressed data and the position data are executed by the receiving computer. A second accepting process for accepting the image data, an expansion process for decompressing the compressed data to return it to image data, a pointer to the position specified by the position data of the image by the image data in the display image based on Displaying a composite image, which is a composite-displayed image, on a second display, which is a display provided with the composite image.

The inventor of the present invention also proposes a computer program for causing a computer to function as the reception side computer of the fifth aspect of the present invention as producing the same effects as the reception side computer of the fifth aspect of the present application.
The computer program receives the compressed data and the position data from the computer included in the receiving computer having the second display, which communicates with the transmitting computer according to the fifth aspect of the invention; An extension process for decompressing data and returning it to image data, and a composite image which is an image obtained by combining and displaying a pointer at a position specified by the position data of the image according to the image data on the display image based on the image data. A computer program for causing a display process to be displayed on a second display that is a display that it comprises.

As another aspect of the fifth invention, the inventor of the present invention also proposes the following communication system which can obtain the same effect as that of the first invention.
The communication system comprises: a receiving computer which is a computer having a display; and a computer having a display or connected to the display so as to be able to communicate with the receiving computer via a wireless LAN. It is a communication system including a certain sending side computer.
Then, the transmitting computer is a screen captured by dropping a frame from a display image which is an image displayed on a first display which is a display that the transmitting computer has or is connected to the transmitting computer. Compression means for converting image data, which is image data, into compressed data in a predetermined format, and position data, which is data for specifying the position on the first display of the pointer displayed on the first display And transmitting means for transmitting the compressed data and the position data to the receiving computer at predetermined time intervals using the function of the wireless LAN, and the compressed data When the receiving computer that has received the image data decompresses the compressed data into the image data. In addition, a composite image, which is an image obtained by combining and displaying a pointer at a position specified by the position data of an image based on the image data, can be displayed on a second display as a display. .

According to a sixth aspect of the present invention, there is provided a receiving side computer which is a computer having a display, and a transmitting side which is a computer having a display or connected to a display, capable of communicating via a wireless LAN. It is a computer.
Then, the transmitting computer is a screen captured by dropping a frame from a display image which is an image displayed on a first display which is a display that the transmitting computer has or is connected to the transmitting computer. The image data, which is the data of the image, is a composite image which is an image obtained by combining and displaying the pointer displayed on the first display when the image corresponding to the image data is displayed on the first display. And compression means for compressing the compressed data into the following format, and transmission means for transmitting the compressed data to the receiving computer at predetermined time intervals using a wireless LAN function, The receiving computer that has received the data decompresses the compressed data to generate an image of the image data. A composite image is a pointer composite display image at a position specified by the serial position data, and the image is assumed to be able to display on the second display is a display with it.
The sending computer sends the compressed data obtained by compressing the data of the composite image to the receiving computer using the function of the wireless LAN by itself without using the communication device. From the viewpoint of the receiving computer, it is the same as the third and fourth inventions that it receives. Therefore, the receiving computer can display on its second display the same image as displayed on the second display of the receiving computer used in combination with the third and fourth inventions. That is, the same effects as those of the first invention can be obtained by the communication device of the sixth invention.

The inventor of the present invention also proposes a method to be executed by the transmitting computer of the sixth aspect of the present invention, which produces the same effect as the transmitting computer of the sixth aspect of the present invention.
The method consists of a receiving computer being a computer having a display and a transmitting computer being able to communicate via a wireless LAN, having a display or being a computer connected to a display. It is the method to be performed.
Then, the method captures a frame from a display image which is an image displayed on a first display which is executed by the transmitting computer, which is a display that the transmitting computer has or is connected to the transmitting computer. The image data, which is the data of the image for one screen, is an image obtained by combining and displaying the pointer displayed on the first display when the image corresponding to the image data is displayed on the first display. It includes a compression process for converting a composite image into compressed data compressed into a predetermined format, and a transmission process for transmitting the compressed data to a receiving computer at predetermined time intervals using a wireless LAN function. The receiving computer receiving the compressed data decompresses the compressed data to obtain the image Over data pointer to a position specified by the position data of the image and the composite image is synthesized and displayed image by, to be able to display the image on the second display is a display with it.

The inventor of the present invention also proposes a computer program for causing a computer to function as a transmission side computer according to the sixth aspect of the present invention, in order to produce the same effect as the communication device according to the sixth aspect of the present invention.
The computer program includes, as a transmitting computer, a receiving computer, which is a computer having a display, and a computer having a display or connected to the display, capable of communicating via a wireless LAN. It is a computer program to make it function.
Then, the computer program causes the computer included in the transmitting computer to display a frame from a display image which is an image displayed on the first display which is a display that the transmitting computer has or is connected to the transmitting computer. The image data, which is the data of one screen of the image captured by dropping, is combined with the pointer displayed on the first display when the image corresponding to the image data is displayed on the first display A compression process for converting compressed data obtained by compressing a composite image into a predetermined format, and a transmission process for transmitting the compressed data to the receiving computer at predetermined time intervals using a wireless LAN function And the receiving side receiving the compressed data. A second display, which is a display provided with a computer, which decompresses the compressed data into a composite image which is an image obtained by synthetically displaying a pointer at the position specified by the position data of the image according to the image data It can be displayed on the

As another aspect of the sixth invention, the inventor of the present invention also proposes the following receiving computer which can obtain the same effect as that of the first invention.
The receiving computer is a receiving computer which communicates with the transmitting computer according to the sixth aspect of the invention, and the second image, the second accepting means for accepting the compressed data, and the display image by decompressing the compressed data A decompression means for returning data of a composite image in which a pointer is composited and displayed at a position specified by the position data of the image by the image data, and the display image is specified by the position data of the image by the image data And a display means for displaying a composite image, which is an image obtained by combining and displaying a pointer at a position, on a second display, which is a display provided with the composite image.

The inventor of the present invention also proposes a method to be executed by the receiving computer of the sixth aspect of the present invention to produce the same effect as that of the receiving computer of the sixth aspect of the present invention.
The method is a method executed by a receiving computer having a second display in communication with the transmitting computer according to the sixth aspect of the invention, wherein the receiving computer receives the compressed data, which is executed by the receiving computer. And a decompression process for decompressing the compressed data and returning to the display image data of a composite image which is an image obtained by synthetically displaying a pointer at the position specified by the position data of the image according to the image data. Displaying a composite image, which is an image obtained by combining and displaying a pointer at a position specified by the position data of the image according to the image data, on a second display that is a display provided with the method; is there.

The inventor of the present invention also proposes a computer program for causing a computer to function as the receiving side computer of the sixth aspect of the present invention as producing the same effect as the receiving side computer of the sixth aspect of the present invention.
The computer program includes a second accepting step of accepting the compressed data to a computer included in a receiving computer having a second display, which communicates with the transmitting computer of the sixth invention, and decompressing the compressed data to obtain the compressed data. In the display image, a decompression process for returning data of a composite image which is an image obtained by combining and displaying a pointer at a position specified by the position data of the image according to the image data, and in the display image, the position of the image according to the image data It is a computer program for performing the display process which displays on a 2nd display which is a display with which the synthetic | combination image which is the image which carried out the synthetic | combination display of the pointer in the position specified by data.

As another aspect of the sixth invention, the inventor of the present invention proposes the following communication system which can obtain the same effect as that of the first invention.
The communication system comprises: a receiving computer which is a computer having a display; and a computer having a display or connected to the display so as to be able to communicate with the receiving computer via a wireless LAN. It is a communication system including a certain sending side computer.
Then, the transmitting computer is a screen captured by dropping a frame from a display image which is an image displayed on a first display which is a display that the transmitting computer has or is connected to the transmitting computer. The image data, which is the data of the image, is a composite image which is an image obtained by combining and displaying the pointer displayed on the first display when the image corresponding to the image data is displayed on the first display. And compression means for compressing the compressed data into the following format, and transmission means for transmitting the compressed data to the receiving computer at predetermined time intervals using a wireless LAN function, The receiving computer that has received the data decompresses the compressed data to generate an image of the image data. A composite image is a pointer composite display image at a position specified by the serial position data, and the image is assumed to be able to display on the second display is a display with it.

In the receiving side computer according to the fifth to sixth aspects of the invention, the transmitting side computer receives the compressed data, and the receiving side computer decompresses the compressed data into the image data, and an image by the image data Change the specification information for specifying the software for enabling the composite image, which is an image obtained by combining and displaying the pointer at the position specified by the position data of the above, to be displayed on the second display that is the display provided with it The receiving computer may be provided with input means for inputting at least a part of the designated information when it is possible.
As in the case where the receiving computer in the first to fourth inventions has an input means for inputting at least a part of the designation information, roughly speaking, it is the same as that displayed on the first display. It can be shown only to the person who wants to show the image. The designation information in this case is, for example, UDP (User Datagram Protocol).

The figure which shows the outline of the communication system of 1st Embodiment. FIG. 2 is a diagram showing a hardware configuration of a transmission side computer included in the communication system shown in FIG. 1. FIG. 2 is a block diagram showing functional blocks formed inside a transmitting computer included in the communication system shown in FIG. 1; FIG. 6 is a view for explaining a method of generating image data in the communication system shown in FIG. 1; FIG. 2 is a diagram showing a hardware configuration of a communication apparatus included in the communication system shown in FIG. 1. FIG. 2 is a block diagram showing functional blocks formed in the communication device included in the communication system shown in FIG. 1; FIG. 2 is a diagram showing a hardware configuration of a receiving computer included in the communication system shown in FIG. 1. FIG. 2 is a block diagram showing functional blocks formed inside a receiving computer included in the communication system shown in FIG. 1; FIG. 7 is a view showing a method of image composition in an image composition unit of a receiving computer included in the communication system shown in FIG. FIG. 10 is a perspective view showing an overview of a communication device included in the communication system of the modification 1; The block diagram which shows the functional block formed in the inside of the transmission side computer contained in the communication system of 2nd Embodiment. The block diagram which shows the functional block formed inside the communication apparatus contained in the communication system of 2nd Embodiment. The block diagram which shows the functional block formed in the inside of the transmission side computer contained in the communication system of 3rd Embodiment. The block diagram which shows the functional block formed inside the receiving side computer contained in the communication system of 3rd Embodiment. The block diagram which shows the functional block formed in the inside of the communication apparatus contained in the communication system of 4th Embodiment. The figure which shows the outline of the communication system of 5th Embodiment. The block diagram which shows the functional block formed inside the transmission side computer contained in the communication system of 5th Embodiment. The block diagram which shows the functional block formed inside the transmission side computer contained in the communication system of 6th Embodiment.

Hereinafter, communication systems according to first to sixth embodiments of the present invention will be described. In addition, a common symbol shall be attached | subjected to the object which is common in description of each embodiment, and the overlapping description shall be abbreviate | omitted depending on the case.
The communication system in each embodiment is not limited to this, but is used for presentation in a conference.

First Embodiment
The outline | summary of the communication system in 1st Embodiment is shown in FIG.
The communication system includes a transmitting computer 100, a communication device 200, and a plurality of receiving computers 300.
The transmitting computer 100 and the communication device 200 are operated by a presenter (or an assistant thereof, the same applies hereinafter) giving a presentation, and the receiving computer 300 is operated by an audience. The receiving computer 300 may be private to the audience, or may be distributed or lent to the audience by the presenter or a collaborator of the presenter.

The sending computer 100 is a computer. The transmission side computer 100 of this embodiment is a notebook computer provided with a display 101. However, the sending computer 100 may be connected to an external display 101 like a desktop computer. The sending computer 100 also comprises an input device 102. The input device 102 in this embodiment is a keyboard, but in addition to or in place of that, the transmission computer 100 may have another input device such as a trackball, a mouse, a touch panel or the like. The sending computer 100 also has several output terminals (not shown). The output terminal is used for connection with the communication device 200, and may be a known one. In this embodiment, it is assumed that at least the USB terminal is present in the transmitting computer 100.
The transmission side computer 100 is equipped with known presentation software and can perform presentation. The software for presentation is, for example, PowerPoint (trademark) manufactured by Microsoft Japan Corporation. A display image, which is an image used for the presentation, is displayed on the display 101, and the presenter makes a presentation while watching it.

The transmission side computer 100 is equipped with hardware as shown in FIG.
The hardware includes a CPU 111, a ROM 112, a RAM 113, an interface 114, and a hard disk drive 115, which are mutually connected by a bus 116.
The CPU 111 is an arithmetic device that performs arithmetic operations. The CPU 111 executes processing to be described later by executing a computer program recorded in, for example, the ROM 112 or the hard disk drive 115. Note that the sending computer 100 may execute various functions that can be normally performed by a notebook computer such as sending and receiving e-mails, browsing the Internet, and creating a document. Although it is such, the computer program here is a computer program for causing the transmitting computer 100 to function as the transmitting computer of the present invention. The computer program may be preinstalled on the sending computer 100 or may be installed after the fact. The installation of the computer program on the transmission side computer 100 may be performed via a predetermined recording medium such as a memory card, or may be performed via a communication line such as a LAN or the Internet.
The ROM 112 stores computer programs and data necessary for the CPU 111 to execute processing to be described later. The same applies to the hard disk drive 115, and a part or all of the computer program and data may be recorded. In addition to the presentation software described above, the hard disk drive 115 stores a computer program for executing various functions normally performed by a notebook computer such as e-mail transmission / reception, Internet browsing, document creation, etc. .
The RAM 113 provides a work area necessary for the CPU 111 to perform processing. Further, data generated as a result of the processing performed by the CPU 111 may be recorded in the RAM 113. A part of the RAM 113 is a frame buffer described later.
The interface 114 exchanges data between the CPU 111 and the RAM 113 connected via the bus 116 and the like and the outside. The interface 114 is connected to the input device 102 described above and a USB terminal (not shown). The operation content from the input device 102 is input from the interface 114, and the data output from the interface 114 to the USB terminal is output from the USB terminal to the outside. A display 101 is connected to the interface 114, and data for controlling a display image displayed on the display 101 is output via the interface 114.

As the CPU 111 executes the computer program, functional blocks as shown in FIG. 3 are generated inside the transmitting computer 100. The following functional blocks may be generated by the functions of the above-described computer program alone, but are generated by the cooperation of the above-described computer program and the OS and other computer programs installed in the transmitting computer 100. It is good.
An operation signal analysis unit 121, a control unit 122, a display image data generation unit 123, an image data generation unit 124, a position data generation unit 125, and a transmission unit 126 are generated inside the transmission side computer 100.

The operation signal analysis unit 121 analyzes the content of the operation signal input from the input device 102. The operation signals associated with this embodiment include the operation of software for presentation. For example, operation signals relating to page turning in presentation software, execution of an animation, and the like are input from the input device 102. Further, the operation signal analysis unit 121 receives an operation signal for moving a pointer on a display image to be described later from a mouse or other input device 102. The operation signal analysis unit 121 analyzes the contents when the operation signal designates each of the contents described above. The operation content analyzed by the operation signal analysis unit 121 is sent to the control unit 122.
Here, the control unit 122 executes software for presentation. The control unit 122 executes presentation software based on the information received from the operation signal analysis unit 121 regarding the content of the operation signal input from the input device 102 by the presenter. A signal about the result of the execution is sent to the display image data generation unit 123. The control unit 122 also determines where on the display image the pointer should be displayed based on the content of the operation signal for moving the pointer, and sends it to the display image data generation unit 123. There is.
The display image data generation unit 123 generates display image data, which is data of a display image to be displayed on the display 101, based on the signal about the execution result of the presentation software received from the control unit 122. It is. The display image data also includes a pointer. The signal generated by the display image data generation unit 123 is sent to the display 101, the image data generation unit 124, and the position data generation unit 125. An image is displayed on the display 101 based on display image data. This is a display image.
The image data generation unit 124 generates image data from the display image data received from the display image data generation unit 123. The display image data is a moving image signal, and as shown in FIG. 4, the signals for the frame are continuous. One convex in the signal shown in FIG. 4 is a signal of one frame, that is, a signal of one screen of a display image. The image data generation unit 124 performs an operation so-called frame removal by extracting one screen's worth of signals for every several from the analog signal. For example, when the original analog signal is 30 fps, as shown by the arrow in FIG. 4, when every third screen of signal is extracted, the moving image created by the image data obtained by this becomes 10 fps . Performing such a frame dropping process takes into consideration that the speed of communication by the wireless LAN is limited. The image data generated by the image data generation unit 124 is sent to the transmission unit 126 each time it is created. The image data does not include pointer information.
The position data generation unit 125 detects position data which is data for specifying the position in the display image of the pointer included in the display image which is an image of the display image data. Usually, this data specifies the position in the display image by its vertical and horizontal (X-Y) coordinates, which is the case in this embodiment. The position data generated by the position data generator 125 is sent to the transmitter 126 each time it is created. The position data is created for at least a number of frames of the display image that are greater than the number of frames for which an image signal is to be generated. In this embodiment, position data is generated from all the frames displayed on the display 101. However, the position data need not necessarily be generated from the display image data, and in this embodiment, since the control unit 122 determines where on the display image the pointer should be displayed, the control unit 122 determines It is possible to obtain data on the coordinates, etc. and use it as position data.
The transmission unit 126 transmits the image data and the position data to the communication device 200. Transmission of image data and position data to the communication device 200 is performed from the USB terminal of the transmission side computer 100. The image data and the position data are sent to the communication device 200 from another port. The position data will be sent to the communication device 200 more frequently than the image data.

Next, the communication device 200 will be described.
The communication apparatus 200 is connected to the transmission side computer 100, and receives an image including a pointer substantially similar to the display image displayed on the display 101 of the transmission side computer 100 received from the transmission side computer 100 as the reception side computer Data to be displayed on the display 300, which will be described later, is transmitted to the plurality of receiving computers 300.

The communication device 200 is a computer. The communication device 200 also comprises an input device 202. Although the input device 202 in this embodiment is a ten key, a keyboard, a mouse, a touch panel or the like can be used as the input device 202. The communication device 200 also includes a USB terminal which is an input terminal (not shown).
The communication device 200 also has a wireless LAN function. The function of the wireless LAN is realized by a wireless LAN communication unit (not shown). The wireless LAN is, but not limited to, Wi-FiTM in this embodiment. By default, Wi-Fi has 253 computers (when using 8-bit data for identification data) or 65533 (when using 16-bit data for identification data) by default. And wireless communication. The wireless LAN communication unit is configured to send data described below to the receiving computer 300 using a UDP (User Datagram Protocol).

The communication device 200 includes hardware as shown in FIG.
The hardware includes a CPU 211, a ROM 212, a RAM 213, and an interface 214, which are connected to one another by a bus 216.
The functions of the CPU 211, the ROM 212, the RAM 213, the interface 214, and the bus 216 are basically the same as the CPU 111, the ROM 112, the RAM 113, and the interface 114 included in the transmitting computer 100.
However, in the RAM 213, a computer program used to perform the processing described later executed by the communication device 200 and data are recorded. The computer program is, although not necessarily limited to this, preinstalled on the communication device 200. The input terminal may be a known one, and in this embodiment, it is assumed that an analog input terminal and a USB terminal exist in the communication device 200. However, the input terminal that is not used in the description of each embodiment may not exist in the communication device 200.
An interface 214 exchanges data between the CPU 211 and the RAM 213 connected via the bus 216 and the outside. The interface 214 is connected to an input / output terminal including the input device 202 described above and a USB terminal. The operation content from the input device 202 and the data from the USB terminal are input from the interface 214. Also, compressed data to be sent to each receiving computer 300 as described later is sent from the interface 214 to the wireless LAN communication unit.
The USB terminal of this embodiment is connected to the USB terminal of the transmission side computer 100 by a USB USB cable 100A. Then, image data and position data are input to the USB terminal of the communication device 200 via the USB cable 100A.
In this embodiment, the USB terminal of the transmission side computer 100 and the USB terminal of the reception side computer are connected by the USB cable 100A, but instead, two computers are connected by wire. Alternatively, a wired LAN, a memory card interface, an express card interface or the like can be used. The connection between the USB terminals can be similarly substituted in the other embodiments and the like.

As the CPU 211 executes the computer program, functional blocks as shown in FIG. 6 are generated in the communication device 200. The following functional blocks may be generated by the functions of the above-described computer program alone, but are generated by the cooperation of the above-described computer program and the OS and other computer programs installed in the communication device 200. Also good.
An operation signal analysis unit 221, a control unit 222, a reception unit 223, a compression unit 224, and a wireless LAN control unit 225 are generated in the communication apparatus 200.

The operation signal analysis unit 221 analyzes the content of the operation signal input from the input device 202. In this embodiment, a numerical value, which is information for specifying designation information to be described later, is input from the input device 202. When an operation signal related to the numerical value is input from the input device 202, the operation signal analysis unit 221 analyzes the numerical value designated by the operation signal. The operation content analyzed by the operation signal analysis unit 221, that is, the numerical value is sent to the control unit 222. The information on the numerical value may be input not from the input device 202 but from the input device 102 of the transmission side computer 100.
Based on the numerical value, the control unit 222 determines a numerical value specifying the software in the receiving computer 300 that processes the compressed data sent from the communication device 200 to each receiving computer 300 as described later. This numerical value is UDP / IP (User Datagram Protocol / Internet Protocol) in this embodiment. The UDP / IP designated by the control unit 222 may be a numerical value itself input from the input device 202 or may be a numerical value obtained by performing some arithmetic operation thereon. The UDP / IP determined by the control unit 222 is sent to the wireless LAN control unit 225.
Image data sent from the transmitting computer 100 and position data are input to the receiving unit 223 from the USB terminal. The receiving unit 223 is configured to send image data to the compression unit 224 and position data to the wireless LAN control unit 225.
The compression unit 224 compresses the received image data each time the image data is received. The compression of the image data may be performed in any format, for example, may be in the MPEG format, but in this embodiment, compression in the JPEG format is performed. Data obtained by compressing image data is compressed data. The compression unit 224 sends the compressed data to the wireless LAN control unit 225 each time it generates the compressed data.
As described above, the wireless LAN control unit 225 receives UDP / IP from the control unit 222, position data from the reception unit 223, and compressed data from the compression unit 224, respectively. The wireless LAN control unit 225 causes them to be sent to the receiving computer 300 by the wireless LAN communication unit. In order to do that, the wireless LAN control unit 225 divides data to be transmitted, such as compressed data and position data, into packets by an existing method. In addition, a header is attached to the end of the packet, and the capacity of data including its own IP address, compressed data and position data to be transmitted from these is received in the header, and the software installed in each receiving computer 300 is received. Writes UDP / IP etc. specifying the software to process the compressed data. These headers and a large number of packets are sent to the wireless LAN communication unit, and sent from the wireless LAN communication unit to each receiving computer 300 using UDP / IP.

Next, the receiving computer 300 will be described.
The receiving computer 300 is a portable computer. The receiving computer 300 is, for example, a notebook computer, or a smartphone or a tablet. For example, the smartphone is an iPhone manufactured and sold by Apple Japan, and the tablet is an iPad manufactured and sold by the company.
The receiving computer 300 comprises a display 301. The receiving computer 300 also comprises an input device 302. The input device 302 can also be configured by a touch panel integrated with the display 301 as well known, in addition to the physical keys as shown in FIG.
Also, the receiving computer 300 has a wireless LAN function. The function of the wireless LAN is realized by a wireless LAN communication unit (not shown). The wireless LAN is, but not limited to, Wi-Fi in this embodiment. The wireless LAN communication unit of the reception side computer 300 can communicate with the wireless LAN communication unit of the communication apparatus 200.

The receiving computer 300 includes hardware as shown in FIG.
The hardware includes a CPU 311, a ROM 312, a RAM 313, an interface 314, and a hard disk drive 315, which are mutually connected by a bus 316.
The functions of the CPU 311, the ROM 312, the RAM 313, the interface 314, the hard disk drive 315, and the bus 316 are basically the same as the functions of the CPU 111, the ROM 112, the RAM 113, the interface 114, the hard disk drive 115, and the bus 116 in the transmitting computer 100. .
However, the ROM 312 or the hard disk drive 315 stores a computer program necessary for realizing the following processing executed by the receiving computer 300. In addition, the ROM 312 or the hard disk drive 315 stores software necessary for executing a process of enlargement (for example, pinch) to be described later and recording of a display image (for example, print screen).
Also, the interface 314 of the receiving computer 300 is connected to the above-described wireless LAN communication unit installed in the receiving computer 300, and the wireless LAN communication unit receives compressed data received from the communication apparatus 200. It has become. Further, the interface 314 is connected to the input device 302, and receives an operation content from the input device 302. The operation content includes at least specification information to be described later. The interface 314 is also connected to the display 301, and sends data for displaying a predetermined display image on the display 301.

When the CPU 311 executes the computer program, functional blocks as shown in FIG. 8 are generated in the receiving computer 300. The following functional blocks may be generated by the functions of the above computer program alone, but are generated by the cooperation of the above computer program and the OS and other computer programs installed in the receiving computer 300. It is good.
An operation signal analysis unit 321, a control unit 322, a designation information analysis unit 323, a reception unit 324, a decompression unit 325, a pointer image generation unit 326, and an image combination unit 327 are generated inside the reception side computer 300.

The operation signal analysis unit 321 analyzes the content of the operation signal input from the input device 302. As operation signals associated with this embodiment, there is specification information. The designation information designates at least a part of a numerical value for determining which software installed in the receiving computer 300 processes the compressed data received by the receiving computer 300 as described later. It is. This numerical value is sent to the control unit 322.
The control unit 322 has a function of determining a numerical value for determining which software installed in the receiving computer 300 processes the compressed data received by the receiving computer 300 when the numerical value is received. Have. This numerical value may be a numerical value itself indicated by the operation content input from the operation signal analysis unit 321, or may be a numerical value obtained as a result of performing some operation on the numerical value. Then, in this embodiment, as a result of such an operation, a numerical value for determining which software installed in the receiving computer 300 is to be used to determine the compressed data received by the receiving computer 300 is determined. It has become so. This numerical value is sent to the designated information analysis unit 323.
The receiver 324 is a header received from the wireless LAN communication unit of the communication apparatus 200 and received by the wireless LAN communication unit of the receiving computer 300, and packets of compressed data and position data (hereinafter, these will be described for simplicity. At the same time, it may be referred to as “packets of compressed data etc.” via the interface 314 each time. When the receiving unit 324 receives them, the data on UDP / IP in the header of the packet such as compressed data is sent to the designated information analyzing unit 323. Also, as described later, the receiving unit 324 sends the compressed data received by the receiving computer 300 to the decompressing unit 325 and the position data received by the receiving computer 300 to the pointer image generating unit 326. There is.
The designated information analysis unit 323 receives UDP / IP in the header of the packet such as compressed data received from the receiving unit 324, and the compressed data received by the receiving computer 300 transmitted from the control unit 322, on the receiving side. A numerical value for determining which software installed in the computer 300 is to be processed is compared. If the numerical values match, the designated information analysis unit 323 sends information indicating that to the reception unit 324. In addition, even when the numerical values do not match, the designated information analysis unit 323 sends the information indicating that effect to the reception unit 324. The UDP / IP in the header of the compressed data packet in the designated information analysis unit 323 and the compressed data received by the receiving computer 300 sent from the control unit 322 are installed in the receiving computer 300. The process of comparing the value with which the software is to be processed is to be performed only when the first compressed data is received, or at predetermined time intervals such as every 10 minutes. It does not matter.
When the reception unit 324 receives the above information indicating that the numerical values match, the compressed data packet is put together to make the original compressed data, and then the compressed data is sent to the decompression unit 325, and the position data is generated as a pointer image Each unit 326 is to be sent. When the reception unit 324 receives the above information indicating that the numerical values do not match, the reception unit 324 discards the compressed data and the position data, and cancels the subsequent processing.
When the decompressing unit 325 receives compressed data from the receiving unit 324, the decompressing unit 325 decompresses the compressed data into image data. The decompressing unit 325 sends image data obtained by decompressing the compressed data to the image combining unit 327.
When the pointer image generation unit 326 receives position data from the reception unit 324, the pointer image generation unit 326 generates an image of a pointer to be superimposed on the image based on the image data, and the background is transparent and has the same size as the image by the image data. It generates data of a pointer image drawn on the image. The position of the pointer on the pointer image is the position indicated by the position data. The pointer image generation unit 326 sends data of the pointer image to the image combining unit 327. The data of the pointer image is created more than the data of the display image.
The image combining unit 327 combines the image data received from the extension unit 325 and the data of the pointer image obtained from the pointer image generation unit 326 to generate data of an image to be finally displayed on the display 301. An image based on the data of the image is displayed on the display 301. The combining of the image data and the data of the pointer image performed by the image combining unit 327 is performed by superimposing the latter image on the former image. This generates an image in which the pointer is synthesized on the image of the image data.
As described above, the number of pointer image data is larger than that of image data. In this embodiment, an image by pointer image data is generated at a speed of 30 fps, and an image by image data is generated at a speed of 10 fps. As shown in FIG. 9, the image combining unit 327 according to this embodiment does not update the image based on the image data until receiving the next image data, and when it receives some image data, it receives it at the same time or Thereafter, the pointer image data received before the next image data is received are combined one after another to generate composite image data for the composite image. In the figure, P is a pointer. Then, a composite image based on the composite image data is displayed on the display 301 at a speed of 30 fps. As described above, since the frame dropping process has already been performed, the portion based on the image data in the display image displayed on the display 301 of the receiving computer 300 is the display image displayed on the display 101 of the transmitting computer 100. However, the number of frames is somewhat smaller than that of the display image displayed on the display 101 of the transmission side computer 100. On the other hand, the part based on the pointer image data in the display image displayed on the display 301 of the reception side computer 300 (that is, the pointer) is the same including the display image displayed on the display 101 of the transmission side computer 100 up to the number of frames. The movement is smooth.

  Next, the usage method and operation of this communication system will be described.

In order to use this communication system, first, the presenter connects the USB terminal of the transmission side computer 100 and the USB terminal of the communication device 200 with the USB cable 100A.
Then, the presenter operates the input device 202 of the communication device 200 to process the compressed data sent to the respective receiving computers 300 to the communication device 200, regardless of the above-mentioned operation or the reception side. Software in the receiving computer 300 which inputs the numerical value specifying the software in the computer 300 and processes the compressed data sent to the receiving computer 300 to the receiving computer 300 which the audience owns. Allows you to enter part of the number you want to specify. The audience inputs the numerical value by the operation of the input device 302.
Generally, the UDP / IP value is determined by adding a predetermined value to the default value of 8255. In this embodiment, the presenter operates the input device 202 so that 8255 + predetermined value (e.g., 1000) + a number (e.g. 10) to be input to an audience to be permitted to receive and decompress compressed data by the receiving computer 300. Among them, a numerical value obtained by adding together a predetermined numerical value (for example, 1000) and a numerical value (for example, 10) to be input to an audience to be permitted to receive and decompress compressed data by the receiving computer 300 is input. The control unit 222 having received this determines UDP / IP as 9265.
On the other hand, in this embodiment, 8255 + predetermined numerical value (for example, 1000) is input in advance to the computer program installed in the receiving computer 300 of the audience, and the audience operates the input device 302 The input numerical value is further added to this by the control unit 322. And 8255 + predetermined numerical value (for example, 1000) is set so as not to be seen from the audience. The presenter participates in the presentation and informs the audience, who may receive and decompress the compressed data, in some way only from the correct number that the audience should enter (which is 10 as described above). Only the audience notified of the correct numerical value can obtain a numerical value 9265 which is a numerical value specifying the software in the receiving computer 300 for processing the compressed data sent to the receiving computer 300. As described above, in addition to the default value of 8255 for UDP / IP, the receiving computer 300 processes compressed data sent to the receiving computer 300 by a predetermined value (eg 1000) invisible to the user. Since it is used to determine the numerical value specifying the software, a malicious third party knows the numerical value specifying the software in the receiving computer 300 that processes the compressed data sent to the receiving computer 300. Is getting harder.
In the communication apparatus 200, the determined numerical value for UDP / IP is sent from the control unit 222 to the wireless LAN control unit 225.
Further, in the receiving computer 300, the numerical value specifying the software in the receiving computer 300, which processes the determined compressed data sent to the receiving computer 300, is sent to the specified information analysis unit 323.

In this state, the presenter starts the presentation.
At this time, the presenter operates the input device 102, and the control unit 122 executes known software for presentation according to the operation content from the input device 102, and specifies the position of the pointer in the display image. A signal about the execution result is sent to the display image data generation unit 123.
The display image data generation unit 123 generates data of an image including a pointer to be displayed on the display 101 of the transmission side computer 100. This data is written to the frame buffer each time and sent to the display 101 each time. The number of frames in this case is, for example, 30 fps. Based on this data, the display 101 displays an image used for a presentation. This image is a display image.
On the other hand, the display image data generation unit 123 sends data on the display image to the image data generation unit 124. The image data generation unit 124 generates image data while performing frame dropping processing. The image data is sent to the transmission unit 126. On the other hand, the display image data generation unit 123 sends data on the display image to the position data generation unit 125. The position data generation unit 125 generates position data that specifies the position of the pointer. The position data is sent to the transmission unit 126.
The transmitting unit 126 transmits the image data and the position data to the USB terminal of the transmitting computer 100. Those data are sent from there to the USB terminal of the communication device 200 via the USB cable 100A. The image data and the position data are not necessarily sent to the receiving computer 300 as a set. In other words, only position data may be sent to the receiving computer 300.

The following processing in the communication device 200 is basically performed automatically.
The image data and position data input from the USB terminal of the communication device 200 are sent to the reception unit 223. The receiving unit 223 sends the image data to the compression unit 224 and the position data to the wireless LAN control unit 225.
Each time the image data is received, the compression unit 224 compresses the received image data to generate compressed data. The compression unit 224 sends the compressed data to the wireless LAN control unit 225 each time it generates the compressed data.
As described above, the wireless LAN control unit 225 receives UDP / IP from the control unit 222, position data from the reception unit 223, and compressed data from the compression unit 224. The wireless LAN control unit 225 causes them to be sent to the receiving computer 300 by the wireless LAN communication unit. In order to do that, the wireless LAN control unit 225 divides data to be transmitted, such as compressed data and position data, into packets by an existing method. In addition, a header is attached to the end of the packet, and the capacity of data including its own IP address, compressed data and position data to be transmitted from these is received in the header, and the software installed in each receiving computer 300 is received. Writes UDP / IP etc. specifying the software to process the compressed data. These headers and a large number of packets are sent to the wireless LAN communication unit, and are sent from the wireless LAN communication unit to each receiving computer 300 using UDP / IP.

A series of packets for compressed data starting from the header is received by the receiving unit 324 via the wireless LAN communication unit of the receiving computer 300. Among the received data, the reception unit 324 sends the data on the UDP / IP written in the header to the designated information analysis unit 323.
The designated information analysis unit 323 receives UDP / IP in the header of the packet such as compressed data received from the receiving unit 324, and the compressed data received by the receiving computer 300 transmitted from the control unit 322, on the receiving side. The numerical values are compared to determine which software installed in the computer 300 is to be processed. When the numerical values match, the designated information analysis unit 323 sends information indicating that to the reception unit 324. Also, even when the numerical values do not match, the designated information analysis unit 323 sends information indicating that to the reception unit 324. In this embodiment, this process is performed only when the receiving computer 300 receives the first compressed data, and the compressed data received by the receiving computer 300 is received.
When the reception unit 324 receives the above information indicating that the numerical values match, the compressed data packet is put together to make the original compressed data, and then the compressed data is sent to the decompression unit 325, and the position data is generated as a pointer image Send to section 326, respectively. When the receiving unit 324 receives the above information indicating that the numerical values do not match, the receiving unit 324 discards the compressed data and the position data, and cancels the subsequent processing.
When the decompressing unit 325 receives the compressed data from the receiving unit 324, the decompressing unit 325 decompresses the compressed data into image data. The decompressing unit 325 sends the image data obtained by decompressing the compressed data to the image combining unit 327.
Further, when receiving the position data from the receiving unit 324, the pointer image generating unit 326 generates data of the pointer image. The pointer image generation unit 326 sends pointer image data to the image combining unit 327 each time it is generated.
The image combining unit 327 combines the image data received from the extension unit 325 and the data of the pointer image obtained from the pointer image generation unit 326 to generate data of an image to be finally displayed on the display 301. Then, an image based on the data of the image is displayed on the display 301.
As described above, the number of pointer image data is larger than that of image data. The composite image based on the composite image data is displayed on the display 301 at a speed of 30 fps. The portion based on the pointer image data in the display image (that is, the pointer) has a faster updating speed than the portion based on the image data in the display image displayed on the display 301 of the reception side computer 300.

The audience can listen to the presentation provided by the presenter while viewing the display image displayed on the display 301. This eliminates the need for paper distribution of presentation materials. The pointer is displayed smoothly on the display image.
If it is difficult to see the display image because, for example, small characters are displayed on the display image, the audience enlarges the display image using a function such as pinch if the receiving computer 300 has one. By doing this, small characters can be clearly recognized, and a portion of the displayed image that you particularly want to focus on can be enlarged and seen.
Also, if the receiving computer 300 has the display image displayed on the display 301 at the timing when the display image to be stored is displayed on the display 301 while watching the display image displayed on the display 301, the audience can display the display image such as a print screen. With the storage function, display image data can be stored, for example, in the hard disk drive 315 of the receiving computer 300. This will eliminate the need to distribute handouts on paper.
The present portable terminal, which is also scheduled to be used as the receiving computer 300, is usually provided with a display image enlargement function and a display image storage function, but at least one of these functions will The computer according to the invention may be included in a computer program for functioning as the receiving computer 300. The computer program for causing the computer according to the present invention to function as the receiving computer 300 may have at least one of the enlarged display image and the stored display image functions in the following embodiments. The same is true for cases.

<Modification 1>
The communication system of the modification 1 is almost the same as the communication system of the first embodiment.
The only difference is that the communication device 200 of the communication system of the modification 1 includes a projector. The projector is, for example, for projecting an image based on the image data received by the communication device 200 of the second embodiment onto an external screen. Since the configuration of the projector is well known, the description of the configuration is omitted. Note that FIG. 10 illustrates the communication device 200 in which the projection unit 203 of the projector is exposed to the outside.
In the first modification, the above-described projector is connected to the interface 214 of the communication apparatus 200 in addition to the USB terminal.
In the first modification, the receiving unit 223 that has received the image data passes the image data to the projector as it is. Based on this data, the projector projects a moving image based on the image data on a screen or the like. This moving image is the same as a display image described later displayed on the display 301 of the receiving computer 300, but since it is based on image data, it is better than that displayed on the display 101 of the transmitting computer 100. The number of frames is down. Also, since this image is based solely on image data, no pointer is included. If it is desired to display a pointer, image composition using position data as performed in the image composition unit 327 of the reception side computer 300 of the first embodiment is performed on image data before being sent to the projector. You should do it.
Although image data is used to display an image on the projector in the above-described example, for example, a display image displayed on the display 101 of the transmitting computer 100 from an analog output terminal of the transmitting computer 100 Is output from the analog input terminal of the communication device 200 and the projector is displayed by the analog signal, the display 101 of the transmitting computer 100 is displayed. You can easily project the same image as on the projector. Examples of the analog terminal include an analog RGB terminal, an HDMI terminal, a DVI terminal, a display port, and a Thunderbolt terminal.
A projector similar to that according to the first modification can be provided in the communication device 200 according to the second to fourth embodiments.

Second Embodiment
A communication system according to the second embodiment will be described.
Similarly to the communication system of the first embodiment, the communication system of the second embodiment is configured to include a transmitting computer 100, a communication device 200, and a plurality of receiving computers 300.

  The transmission side computer 100 of the second embodiment is a computer as in the first embodiment. The hardware configuration is the same as that of the first embodiment. The transmission side computer 100 of the second embodiment includes a display 101, an input device 102, and a USB terminal. The transmission side computer 100 according to the second embodiment also includes a CPU 111, a ROM 112, a RAM 113, an interface 114, a hard disk drive 115, and a bus 116 connecting these components to one another. These functions are basically the same as in the first embodiment.

When the CPU 111 executes the computer program, functional blocks as shown in FIG. 11 are generated inside the transmitting computer 100 of the second embodiment. The following functional blocks may be generated by the functions of the above-described computer program alone, but are generated by the cooperation of the above-described computer program and the OS and other computer programs installed in the transmitting computer 100. It is good.
In addition to the functional blocks in the first embodiment, a compression unit 127 is generated inside the transmission side computer 100.

The functions of the operation signal analysis unit 121, the control unit 122, the display image data generation unit 123, the image data generation unit 124, the position data generation unit 125, and the transmission unit 126 are the same as in the first embodiment. The only difference is that the image data generation unit 124 sends the generated image data not to the transmission unit 126 but to the compression unit 127.
The function of the compression unit 127 of the second embodiment is the same as that of the compression unit 224 in the communication device 200 in the first embodiment. The compression unit 127 compresses the image data received from the image data generation unit 124 into compressed data, and sends the compressed data to the transmission unit 126.

Next, the communication device 200 will be described.
The communication device 200 is basically configured in the same manner as the communication device 200 in the first embodiment.
The communication device 200 is a computer, and includes an input device 202. The communication apparatus 200 also implements the function of a wireless LAN, which is Wi-Fi in this embodiment.

  The communication device 200 according to the second embodiment includes the same hardware as the communication device 200 according to the first embodiment has. Specifically, the communication device 200 according to the second embodiment includes a CPU 211, a ROM 212, a RAM 213, an interface 214, and a bus 216 interconnecting them. The functions of the CPU 211, the ROM 212, the RAM 213, the interface 214, and the bus 216 are the same as in the first embodiment.

When the CPU 211 executes the computer program, functional blocks as shown in FIG. 12 are generated in the communication device 200. The following functional blocks may be generated by the functions of the above-described computer program alone, but are generated by the cooperation of the above-described computer program and the OS and other computer programs installed in the communication device 200. Also good.
In the communication device 200, the functional blocks other than the compression unit 224 existing in the first embodiment, that is, the operation signal analysis unit 221, the control unit 222, the reception unit 223, and the wireless LAN control unit 225. Is generated. Each of these functions is basically the same as in the first embodiment. The difference is that in the first embodiment, the receiving unit 223 sends the reception and compression unit 224 to the position data and the image data, and the image data is compressed and generated by the compression unit 224 and the wireless LAN control unit 225 is generated therefrom. However, in the second embodiment, the compressed data received by the receiving unit 223 is sent to the wireless LAN control unit 225 as it is to the position data in the second embodiment.
That is, in the communication system of the second embodiment, the compression unit 224, which was included in the communication apparatus 200 in the first embodiment, can be grasped as being merely transferred as the compression unit 127 inside the transmission side computer 100. it can.

Next, the receiving computer 300 will be described.
The hardware configuration of the reception side computer 300 of the second embodiment, the functional blocks generated therein, and the operation thereof are the same as in the first embodiment.

  Next, the usage method and operation of the communication system of the second embodiment will be described.

  In order to use this communication system, first, the presenter connects the USB terminal of the transmission side computer 100 and the USB terminal of the communication device 200 with a USB cable. In addition, the presenter operates the input device 202 of the communication device 200 to input to the communication device 200 a numerical value designating software in the receiving computer 300 for processing the compressed data sent to each receiving computer 300. At the same time, the audience is allowed to input a part of numerical values specifying software in the receiving computer 300 which processes compressed data sent to the receiving computer 300 to the receiving computer 300 owned by the audience.

In this state, the presenter starts the presentation.
The presenter operates the input device 102, and the control unit 122 specifies the position of the pointer in accordance with the operation content from the input device 102, and executes known presentation software. A signal about the execution result is sent to the display image data generation unit 123.
The display image data generation unit 123 generates data of an image including a pointer to be displayed on the display 101 of the transmission side computer 100. This data is written to the frame buffer each time and sent to the display 101 each time. The number of frames in this case is, for example, 30 fps. Based on this data, the display 101 displays a display image used for a presentation.
On the other hand, the display image data generation unit 123 sends data on the display image to the image data generation unit 124. The image data generation unit 124 performs the frame dropping process as described above to generate image data. The image data generation unit 124 intermittently sends the generated image data to the compression unit 127. The compression unit 127 compresses the image data into compressed data, and sends the compressed data to the USB terminal of the transmitting computer 100. Image data is received by the USB terminal of the communication device 200 via the USB cable.

In the communication device 200, the following processing is basically performed automatically.
In addition, since the process which the operation signal analysis part 221 and the control part 222 perform is the same as that of the case of 1st Embodiment, the description is abbreviate | omitted.
The receiving unit 223 receives compressed data and position data input from the USB terminal. The receiving unit 223 sends them to the wireless LAN control unit 225. The wireless LAN control unit 225 divides them into packets in the same manner as in the first embodiment. The wireless LAN control unit 225 divides the compressed data and the position data into packets, adds a header similar to that of the first embodiment, and sends them to the wireless LAN communication unit. The wireless LAN communication unit sends the data to each receiving computer 300.

  The data received by the receiving computer 300 from the communication device 200 does not change between the first embodiment and the second embodiment. That is, the subsequent processes executed by the receiving computer 300 of the second embodiment are the same as those of the first embodiment.

Third Embodiment
A communication system according to the third embodiment will be described.
Similarly to the communication system of the first embodiment, the communication system of the third embodiment is configured to include a transmission side computer 100, a communication apparatus 200, and a plurality of reception side computers 300.

  The transmission side computer 100 of the third embodiment is a computer as in the first embodiment. The hardware configuration is the same as that of the first embodiment. The transmission side computer 100 of the third embodiment includes a display 101, an input device 102, and a USB terminal. The transmission side computer 100 according to the third embodiment also includes a CPU 111, a ROM 112, a RAM 113, an interface 114, a hard disk drive 115, and a bus 116 for interconnecting them. These functions are basically the same as in the first embodiment.

When the CPU 111 executes the computer program, functional blocks as shown in FIG. 13 are generated in the transmitting computer 100 of the third embodiment. The following functional blocks may be generated by the functions of the above-described computer program alone, but are generated by the cooperation of the above-described computer program and the OS and other computer programs installed in the transmitting computer 100. It is good.
In addition to the functional blocks in the second embodiment, a pointer image generation unit 128 and an image synthesis unit 129 are generated inside the transmission side computer 100.

The functions of the operation signal analysis unit 121, the control unit 122, the display image data generation unit 123, the image data generation unit 124, the position data generation unit 125, the transmission unit 126, and the compression unit 127 are the same as those in the first embodiment. The difference is that the image data generation unit 124 sends the generated image data to the image synthesis unit 129 instead of the compression unit 127, and the position data generation unit 125 transmits the position data to the transmission unit 126. Rather, they are sent to the pointer image generation unit 128.
The functions of the pointer image generation unit 128 and the image combining unit 129 according to the third embodiment are the same as the pointer image generation unit 326 and the image combining unit 327 that were included in the receiving computer 300 in the first embodiment.
That is, when receiving the position data from the position data generation unit 125, the pointer image generation unit 128 generates data of the pointer image. The pointer image generation unit 128 sends data of the pointer image to the image combining unit 129.
The image combining unit 129 combines the image data received from the image data generating unit 124 and the data of the pointer image obtained from the pointer image generating unit 128, and is a combined image which is data of an image to be finally displayed on the display 301. It generates data. The generated composite image data is sent to the compression unit 127.
The compression unit 127 compresses the composite image data to generate compressed data. This compressed data is different from the case of the first embodiment and the second embodiment, and is not image data but compressed composite image data of an image obtained by combining pointers. The compressed data is sent to the transmitter 126.
The transmission unit 126 is configured to transmit compressed data to the communication device 200. Unlike in the first embodiment and the second embodiment, the position data is not sent to the communication device 200.

Next, the communication device 200 will be described.
The communication device 200 is basically configured in the same manner as the communication device 200 in the first embodiment.
The communication device 200 is a computer, and includes an input device 202. The communication apparatus 200 also implements the function of a wireless LAN, which is Wi-Fi in this embodiment.

  The communication device 200 according to the third embodiment includes the same hardware as the communication device 200 according to the first embodiment has. Specifically, the communication device 200 according to the third embodiment includes a CPU 211, a ROM 212, a RAM 213, an interface 214, and a bus 216 interconnecting them. The functions of the CPU 211, the ROM 212, the RAM 213, the interface 214, and the bus 216 are the same as in the first embodiment.

As the CPU 211 executes the computer program, the same functional blocks as those in the second embodiment are generated in the communication device 200. The functional blocks of the communication device 200 may be generated by the function of the above-described computer program alone, but are generated by the cooperation of the above-described computer program and the OS and other computer programs installed in the communication device 200. It may be done.
The function of each functional block generated inside the communication device 200 is basically the same as in the second embodiment. The difference is that in the second embodiment, the receiving unit 223 receives and transmits compressed data and position data to the wireless LAN control unit 225, while in the third embodiment, the receiving unit 223 receives the wireless LAN control unit. The point is that only compressed data is sent to 225.
The wireless LAN control unit 225 sends compressed data, which has been divided into packets, to the receiving computer 300 via the wireless LAN communication unit.

Next, the receiving computer 300 will be described.
The receiving computer 300 is configured in the same manner as in the first embodiment. The hardware configuration is also the same as in the first embodiment, and the receiving computer 300 of the third embodiment includes a CPU 311, a ROM 312, a RAM 313, an interface 314, a hard disk drive 315, and a bus 316.
When the CPU 311 executes the computer program, functional blocks as shown in FIG. 14 are generated in the receiving computer 300. The following functional blocks may be generated by the functions of the above computer program alone, but are generated by the cooperation of the above computer program and the OS and other computer programs installed in the receiving computer 300. It is good.
Roughly speaking, the functional blocks generated inside the receiving computer 300 remove the pointer image generating unit 326 from the functional blocks generated inside the receiving computer 300 of the first embodiment, and The display unit 328 is provided instead.

The functions of the operation signal analysis unit 321, the control unit 322, the designation information analysis unit 323, the reception unit 324, and the decompression unit 325 are the same as in the first embodiment.
What differs between the first embodiment and the third embodiment is that the reception unit 324 receives compressed data and position data in the first embodiment but only position data in the third embodiment. There is a point. The compressed data is sent from the reception unit 324 to the decompression unit 325 when the same conditions as in the first embodiment are satisfied.
The decompressing unit 325 decompresses the compressed data as in the case of the first embodiment, but the data obtained as a result is different from the case of the first embodiment, which is the image data, and in the case of the third embodiment, the composition is combined. It is image data. The composite image data is sent from the decompression unit 325 to the display unit 328.
The display unit 328 displays an image based on the composite image data on the display 301. Since the pointer is already written in the image based on the composite image data received by the display unit 328, the display unit 328 does not have to perform the image combining process as the image combining unit 327 in the first embodiment.
In short, it can be said that the communication system of the third embodiment is one in which the image compositing performed in the first embodiment has all been completed by the transmission side computer 100.

  Next, the usage method and operation of the communication system of the third embodiment will be described.

  In order to use this communication system, first, the presenter connects the USB terminal of the transmission side computer 100 and the USB terminal of the communication device 200 with a USB cable. In addition, the presenter operates the input device 202 of the communication device 200 to input to the communication device 200 a numerical value designating software in the receiving computer 300 for processing the compressed data sent to each receiving computer 300. At the same time, the audience is allowed to input a part of numerical values specifying software in the receiving computer 300 which processes compressed data sent to the receiving computer 300 to the receiving computer 300 owned by the audience.

In this state, the presenter starts the presentation.
The presenter operates the input device 102, and the control unit 122 specifies the position of the pointer in accordance with the operation content from the input device 102, and executes known presentation software. A signal about the execution result is sent to the display image data generation unit 123.
The display image data generation unit 123 generates data of an image including a pointer to be displayed on the display 101 of the transmission side computer 100. Based on this data, the display 101 displays a display image used for a presentation.
On the other hand, the display image data generation unit 123 sends data on the display image to the image data generation unit 124. The image data generation unit 124 intermittently sends the generated image data to the image synthesis unit 129. The display image data generation unit 123 also sends data on the display image to the position data generation unit 125. The position data generation unit 125 generates position data and sends it to the pointer image generation unit 128.
The pointer image generation unit 128 generates pointer image data and sends it to the image combining unit 129.
The image combining unit 129 combines the image based on the image data and the pointer image to generate combined image data which is data of an image to be finally displayed on the display 301 of the receiving computer 300. The composite image data is sent from the image combining unit 129 to the compression unit 127.
The compression unit 127 compresses the composite image data to generate compressed data. The compression unit 127 sends the compressed data generated by the compression unit 127 to the transmission unit 126.
The transmitter 126 sends it to the communication device 200.

In the communication device 200, the following processing is basically performed automatically.
In addition, since the process which the operation signal analysis part 221 and the control part 222 perform is the same as that of the case of 1st Embodiment, the description is abbreviate | omitted.
The reception unit 223 receives the compressed data input from the USB terminal. The receiving unit 223 sends the compressed data to the wireless LAN control unit 225 as it is. The wireless LAN control unit 225 divides compressed data into packets in the same manner as in the first embodiment, adds a header similar to that in the first embodiment, and transmits them to the wireless LAN communication unit. Send to The wireless LAN communication unit sends the data to each receiving computer 300.

A series of packets for compressed data starting from the header is received by the receiving unit 324 via the wireless LAN communication unit of the receiving computer 300. Among the received data, the reception unit 324 sends the data on the UDP / IP written in the header to the designated information analysis unit 323.
The designated information analysis unit 323 receives UDP / IP in the header of the packet such as compressed data received from the receiving unit 324, and the compressed data received by the receiving computer 300 transmitted from the control unit 322, on the receiving side. The numerical values are compared to determine which software installed in the computer 300 is to be processed. When the numerical values match, the designated information analysis unit 323 sends information indicating that to the reception unit 324. Also, even when the numerical values do not match, the designated information analysis unit 323 sends information indicating that to the reception unit 324. In this embodiment, this process is performed only when the receiving computer 300 receives the first compressed data, and the compressed data received by the receiving computer 300 is received.
When the receiving unit 324 receives the above information indicating that the numerical values match, the receiving unit 324 puts together the packets of the compressed data into the original compressed data, and then sends the compressed data to the decompressing unit 325. When the reception unit 324 receives the above information indicating that the numerical values do not match, the reception unit 324 discards the compressed data and cancels the subsequent processing.
When the decompressing unit 325 receives the compressed data from the receiving unit 324, the decompressing unit 325 decompresses the compressed data into composite image data. The decompression unit 325 sends the composite image data to the display unit 328.
The display unit 328 displays an image including a pointer based on the composite image data on the display 301.

Fourth Embodiment
A communication system according to the fourth embodiment will be described.
Similarly to the communication system of the first embodiment, the communication system of the fourth embodiment is configured to include a transmission side computer 100, a communication device 200, and a plurality of reception side computers 300.

  The transmission side computer 100 of the fourth embodiment is a computer as in the first embodiment. The hardware configuration is the same as that of the first embodiment. The transmission side computer 100 of the fourth embodiment includes a display 101, an input device 102, and a USB terminal. The transmission side computer 100 according to the fourth embodiment also includes a CPU 111, a ROM 112, a RAM 113, an interface 114, a hard disk drive 115, and a bus 116 for interconnecting them. These functions are basically the same as in the first embodiment.

When the CPU 111 executes the computer program, the same functional blocks as those in the first embodiment are generated in the transmission side computer 100 of the fourth embodiment. The function of each functional block generated in the transmission side computer 100 in the fourth embodiment is the same as that in the first embodiment.
The functional blocks generated in the transmission side computer 100 in the fourth embodiment may be generated by the function of the above-described computer program alone, but the above computer program, the OS installed in the transmission side computer 100, etc. It may be generated in cooperation with a computer program.

Next, the communication device 200 will be described.
The communication device 200 is basically configured in the same manner as the communication device 200 in the first embodiment.
The communication device 200 is a computer, and includes an input device 202. The communication apparatus 200 also implements the function of a wireless LAN, which is Wi-Fi in this embodiment.

  The communication device 200 according to the fourth embodiment includes the same hardware as the communication device 200 according to the first embodiment has. Specifically, the communication apparatus 200 according to the fourth embodiment includes a CPU 211, a ROM 212, a RAM 213, an interface 214, and a bus 216 for interconnecting them. The functions of the CPU 211, the ROM 212, the RAM 213, the interface 214, and the bus 216 are the same as in the first embodiment.

When the CPU 211 executes a computer program, in addition to the functional blocks generated in the communication device 200 in the first embodiment, a pointer image generation unit 226 and an image combining unit 227 are generated in the communication device 200. (Figure 15).
The functions of the functional blocks of the operation signal analysis unit 221, the control unit 222, the reception unit 223, the compression unit 224, and the wireless LAN control unit 225 are basically the same as in the first embodiment. However, the receiving unit 223 sends the position data received from the transmitting computer 100 to the pointer image generating unit 226 instead of the wireless LAN control unit 225, and the image data received from the transmitting computer 100 to the image instead of the compression unit 224. It is sent to the combining unit 227. Also, instead of receiving the position data and the image data, the wireless LAN control unit 225 receives compressed data as described later.
The functions of the pointer image generation unit 226 and the image combining unit 227 in the fourth embodiment are the same as the pointer image generation unit 326 and the image combining unit 327 in the first embodiment, which are included in the receiving computer 300.
That is, when receiving the position data from the receiving unit 223, the pointer image generating unit 226 generates data of the pointer image. The pointer image generation unit 226 sends data of the pointer image to the image combination unit 227.
The image combining unit 227 combines the image data received from the receiving unit 223 and the data of the pointer image obtained from the pointer image generating unit 226, and finally generates combined image data as image data to be displayed on the display 301. It is generated. The generated composite image data is sent to the compression unit 224.
The compression unit 224 compresses the image data to be compressed data in the first embodiment, but in the fourth embodiment, the composite image data is compressed to be compressed data. The compression unit 224 is configured to send, to the wireless LAN control unit 225, compressed data obtained by compressing the combined image data of the image combined with the pointer.
The wireless LAN control unit 225 sends compressed data, which has been divided into packets, to the receiving computer 300 via the wireless LAN communication unit. The data sent from the wireless LAN control unit 225 to the receiving computer 300 does not include position data in the fourth embodiment.
In short, it can be said that the communication system of the fourth embodiment is one in which all the image composition performed in the first embodiment has been completed by the communication device 200.

Next, the receiving computer 300 will be described.
The receiving computer 300 is the same as that of the third embodiment, including the hardware configuration and the functional blocks generated therein.

  Next, a method of using the communication system of the fourth embodiment and an operation thereof will be described.

  In order to use this communication system, first, the presenter connects the USB terminal of the transmission side computer 100 and the USB terminal of the communication device 200 with a USB cable. In addition, the presenter operates the input device 202 of the communication device 200 to input to the communication device 200 a numerical value designating software in the receiving computer 300 for processing the compressed data sent to each receiving computer 300. At the same time, the audience is allowed to input a part of numerical values specifying software in the receiving computer 300 which processes compressed data sent to the receiving computer 300 to the receiving computer 300 owned by the audience.

In this state, the presenter starts the presentation.
The processing at the transmitting computer 100 is the same as in the first embodiment.
Image data and position data are sent from the transmitting computer 100 to the communication device 200.

The receiving unit 223 receives the image data and the position data from the transmitting computer 100, and sends the position data to the pointer image generating unit 226 and the image data to the image combining unit 227.
When receiving the position data from the reception unit 223, the pointer image generation unit 226 generates data of the pointer image. The pointer image generation unit 226 sends the data of the pointer image to the image combining unit 227.
The image combining unit 227 combines the image data received from the receiving unit 223 and the data of the pointer image obtained from the pointer image generating unit 226, and finally generates combined image data as image data to be displayed on the display 301. Generate The generated composite image data is sent to the compression unit 224.
The compression unit 224 compresses the composite image data to generate compressed data. The compression unit 224 sends, to the wireless LAN control unit 225, compressed data obtained by compressing composite image data.
The wireless LAN control unit 225 sends the divided compressed data as a packet to the receiving computer 300 via the wireless LAN communication unit.

The receiving computer 300 receives compressed data divided into packets from the communication device 200. The compressed data is obtained by compressing the composite image data, and is the same as the compressed data received by the receiving computer 300 of the third embodiment from the communication device 200.
As described above, the receiving computer 300 of the fourth embodiment is the same as the receiving computer 300 of the third embodiment. The subsequent processes performed by the receiving computer 300 of the fourth embodiment are the same as the processes performed by the receiving computer 300 of the third embodiment.

Fifth Embodiment
Next, the communication system of the fifth embodiment will be described.
Unlike the communication system of the first embodiment, the communication system of the fifth embodiment does not include the communication device 200, as shown in FIG. That is, the communication system of the fifth embodiment is configured to include the transmission side computer 100 and the plurality of reception side computers 300.

The transmission side computer 100 of the fifth embodiment is a computer as in the first embodiment. The hardware configuration is the same as that of the first embodiment. The transmission side computer 100 of the fifth embodiment includes a display 101 and an input device 102. The output terminal may not include the USB terminal. The transmission side computer 100 of the fifth embodiment has a communication function by wireless LAN. The function is the same as that implemented by the communication device 200 of the first embodiment. Roughly speaking, it can be said that the transmission side computer 100 of the fifth embodiment is a combination of the transmission side computer 100 and the communication device 200 of the first embodiment.
The transmission side computer 100 of the fifth embodiment is also provided with a CPU 111, a ROM 112, a RAM 113, an interface 114, a hard disk drive 115, and a bus 116 for interconnecting them. These functions are basically the same as in the first embodiment.
The same wireless LAN communication unit as that included in the communication apparatus 200 of the first embodiment is connected to the interface 114.

The execution of the computer program by the CPU 111 generates functional blocks as shown in FIG. 17 in the transmission side computer 100 of the fifth embodiment. The following functional blocks may be generated by the functions of the above-described computer program alone, but are generated by the cooperation of the above-described computer program and the OS and other computer programs installed in the transmitting computer 100. It is good.
The operation signal analysis unit 121, the control unit 122, the display image data generation unit 123, the image data generation unit 124, the position data generation unit 125, the compression unit 224, and the wireless LAN control unit 225 are generated inside the transmission side computer 100. Be done.
The functions of the operation signal analysis unit 121, the control unit 122, the display image data generation unit 123, the image data generation unit 124, and the position data generation unit 125 of the fifth embodiment are the same as those of the transmission side computer 100 in the first embodiment. It is not different from those functions that are generated. The functions of the compression unit 224 and the wireless LAN control unit 225 of the fifth embodiment are the same as the functions generated in the communication apparatus 200 in the first embodiment.
However, the operation signal analysis unit 121 of the fifth embodiment has the functions of the operation signal analysis unit 121 of the transmission side computer 100 of the first embodiment and the operation signal analysis unit 221 of the communication device 200. It has become. In addition, the control unit 122 of the fifth embodiment has the functions of the control unit 122 included in the transmission side computer 100 according to the first embodiment and the control unit 222 included in the communication apparatus 200. That is, the input device 102 according to the fifth embodiment can input numerical values for specifying software in the receiving computer 300, which processes compressed data sent to each receiving computer 300. The operation signal analysis unit 121 according to the fifth embodiment can analyze the numerical value, and the control unit 122 according to the fifth embodiment transmits the compressed data to the receiving computers 300. It is possible to determine the numerical value specifying the software on the receiving computer 300 that processes the data. The control unit 122 also sends the determined value to the wireless LAN control unit 225.
The wireless LAN control unit 225 in the fifth embodiment has the same function as the wireless LAN control unit 225 included in the communication apparatus 200 in the first embodiment. That is, when the wireless LAN control unit 225 receives the compressed data from the compression unit 224 and the position data from the position data generation unit 125, the wireless LAN control unit 225 divides the compressed data and the position data or the position data into packets. With the same header as in the case of the form, they are sent to the wireless LAN communication unit. The wireless LAN control unit 225 in the fifth embodiment receives, from the control unit 122, a numerical value for specifying software in the receiving computer 300, which processes compressed data sent to each receiving computer 300. It is possible to write numerical values for / IP in the header as in the first embodiment.
The wireless LAN communication unit is configured to send a header and a packet of compressed data to each receiving computer 300 in the same manner as the wireless LAN communication unit included in the communication apparatus 200 according to the first embodiment.

Next, the receiving computer 300 will be described.
The hardware configuration of the reception side computer 300 of the fifth embodiment, the functional blocks generated therein, and the operation thereof are the same as in the first embodiment.

  Next, a method of using the communication system of the fifth embodiment and an operation thereof will be described.

  To use this communication system, first, the presenter operates the input device 102 of the transmitting computer 100 to process the compressed data sent to each receiving computer 300 to the transmitting computer 100, the receiving computer At the same time as inputting the numerical value for designating the software in 300, designating the software in the receiving computer 300 for processing the compressed data sent to the receiving computer 300 to the audience computer 300 which the audience owns. Input part of the

In this state, the presenter starts the presentation.
The presenter operates the input device 102, and the control unit 122 executes known presentation software according to the operation content from the input device 102. A signal about the execution result is sent to the display image data generation unit 123.
The display image data generation unit 123 generates data on an image to be displayed on the display 101 of the transmission side computer 100. This data is sent to the display 101 each time. The number of frames in this case is, for example, 30 fps. Based on this data, the display 101 displays a display image used for a presentation.
On the other hand, the display image data generation unit 123 sends data on the display image to the image data generation unit 124. The image data generation unit 124 performs the frame dropping process as described above to generate image data. The image data generation unit 124 intermittently sends the generated image data to the compression unit 224.
Each time the image data is received, the compression unit 224 compresses the image data to generate compressed data. The compression unit 224 intermittently sends the compressed data to the wireless LAN control unit 225.
Every time the wireless LAN control unit 225 receives compressed data, it divides the compressed data into packets, adds a header similar to that of the first embodiment, and sends them to the wireless LAN communication unit. Along with the compressed data, position data may also be sent, or only position data may be sent.
The wireless LAN communication unit sends the data to each receiving computer 300.

  In the case of the fifth embodiment, the series of packets for compressed data with the header at the top is received by the wireless LAN communication unit of the receiving computer 300 as in the first embodiment. The subsequent processes in the receiving computer 300 are all the same as in the first embodiment.

Sixth Embodiment
Next, the communication system of the sixth embodiment will be described.
The communication system of the sixth embodiment is configured to include a transmitting computer 100 and a plurality of receiving computers 300 as in the fifth embodiment.

The transmission side computer 100 of the sixth embodiment is a computer as in the fifth embodiment. The hardware configuration is the same as that of the first embodiment. The transmission side computer 100 of the sixth embodiment includes a display 101 and an input device 102. The output terminal may not include the USB terminal. The transmission side computer 100 of the sixth embodiment has a function of communication by wireless LAN. The function is the same as that implemented by the communication device 200 of the first embodiment. Roughly speaking, it can be said that the transmission side computer 100 of the sixth embodiment is a combination of the transmission side computer 100 and the communication device 200 of the third embodiment.
The transmission side computer 100 according to the sixth embodiment also includes a CPU 111, a ROM 112, a RAM 113, an interface 114, a hard disk drive 115, and a bus 116 for interconnecting them. These functions are basically the same as in the first embodiment.
The same wireless LAN communication unit as that included in the communication apparatus 200 of the second embodiment is connected to the interface 114.

When the CPU 111 executes the computer program, functional blocks as shown in FIG. 18 are generated in the transmitting computer 100 of the sixth embodiment. The following functional blocks may be generated by the functions of the above-described computer program alone, but are generated by the cooperation of the above-described computer program and the OS and other computer programs installed in the transmitting computer 100. It is good.
Inside the transmission side computer 100, an operation signal analysis unit 121, a control unit 122, a display image data generation unit 123, an image data generation unit 124, a position data generation unit 125, a compression unit 127, a pointer image generation unit 128, an image synthesis A unit 129 and a wireless LAN control unit 225 are generated.
Each function of the operation signal analysis unit 121, the control unit 122, the display image data generation unit 123, the image data generation unit 124, the position data generation unit 125, the compression unit 127, the pointer image generation unit 128, and the image combining unit 129 is the third embodiment. It is not different from the case of form. The only difference is that the destination to which the image combining unit 129 sends combined image data is not the transmitting unit 126 but the wireless LAN control unit 225.
Further, the function of the wireless LAN control unit 225 of the sixth embodiment is the same as that of the wireless LAN control unit 225 of the third embodiment.

Next, the receiving computer 300 will be described.
The hardware configuration of the reception side computer 300 of the sixth embodiment, the functional blocks generated therein, and the operation thereof are the same as those of the third embodiment.

  Next, the usage method and operation of the communication system of the sixth embodiment will be described.

The usage method and operation of this communication system are the same as those of the communication system of the third embodiment.
The only difference is that the image combining unit 129 sends combined image data not to the transmitting unit 126 but to the wireless LAN control unit 225.

Reference Signs List 100 transmission side computer 101 display 102 input device 121 operation signal analysis unit 122 control unit 123 display image data generation unit 124 image data generation unit 125 position data generation unit 126 transmission unit 127 compression unit 128 pointer image generation unit 129 image synthesis unit 200 communication Device 202: Input device 221: Operation signal analysis unit 222: Control unit 223: Reception unit 224: Compression unit 225: Wireless LAN control unit 226: Pointer image generation unit 227: Image combining unit 300: Reception computer 301: Display 302: Input device 321: Operation signal analysis unit 322: Control unit 323 Designated information analysis unit 324 Reception unit 325 Decompression unit 326 Pointer image generation unit 327 Image composition unit

The following contents will be appropriate to the first invention and the second invention.
The transmission means of the communication device may simultaneously transmit the compressed data and the position data to the plurality of receiving computers. By doing so, in the case where the communication system including the communication device of the present application is applied to "a substitute for a conventional projector", it can cope with a plurality of audiences, and "small scale, simple It is possible to apply the version to the "TV broadcasting system".
The following contents apply to all of the first to fourth inventions.
The transmission means of the communication apparatus may simultaneously transmit the compressed data to the plurality of receiving computers. This serves to cause the communication system including the communication device of the present application to function as a "small-scale, simplified version of the television broadcasting system".
The transmission of data such as image data from the transmitting computer to the communication apparatus may be performed in any manner. For example, this transmission may be wired or wireless, but wired transmission may be suitable in the sense that there is no speed limitation. As an example of wired transmission, data transmission using a USB terminal can be mentioned. For example, the reception unit of the communication apparatus may be a USB terminal, and may be connected to a USB terminal of the transmission side computer. The sending computer is often a laptop computer or a desktop computer, and may be a portable terminal, but in any case, since these are often equipped with a USB terminal, such a configuration There is a good possibility that there is no inconvenience in adopting
Of course, data about an image (image data or compressed data) is intermittently sent from the sending computer to the receiving computer. These data may be sent at predetermined intervals, whether they are constant or not, for example, data of several frames to several tens of frames per second. The predetermined interval may or may not be a constant interval.
The communication device may include a projector device that projects the display image. For example, presentation can be realized using this communication device while projecting a display image with the projector device.

Claims (1)

It is used by being connected to a transmitting computer which is a computer having a display or connected to a display, and can communicate with a receiving computer which is a computer having a display via a wireless LAN. Communication device, and
Image data which is image data of one screen captured by dropping a frame from a display image which is an image displayed on the first display which is the display which the transmission side computer has or is connected to the transmission side computer And reception means for receiving from the transmission side computer at a predetermined timing, position data which is data specifying the position on the first display of the pointer displayed on the first display.
Compression means for converting the image data into compressed data compressed into a predetermined format;
Transmitting means for transmitting the compressed data and the position data to the receiving computer at predetermined time intervals using a wireless LAN function;
Equipped with
The receiving computer which has received the compressed data decompresses the compressed data to form the image data, and a combined image is displayed by synthetically displaying a pointer at a position specified by the position data of the image according to the image data. To allow the image to be displayed on a second display, which is the display it comprises
Communication device.

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