JP2004147013A - Picture display system, picture input device and picture display device, which are used for the same and control method of picture display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve responsiveness of switching of a display picture to a picture display device. <P>SOLUTION: A file ID is given to the picture photographed by a digital camera (DC) 30 when it is stored in a memory 34 as a picture file. When a request operation of picture display is performed, the DC 30 displays the picture on a color liquid crystal display panel 32 and transmits all picture files with the file ID, which are stored in the memory 34. The picture display device 40 stores the received picture file in a memory 44 by associating it with the file ID. When a change request operation of picture display is performed, the DC30 changes the display picture of the color liquid crystal display panel 32 and transmits the file ID of the changed picture. The picture display device 40 retrieves the picture file stored in the memory 44 with the received file ID as a key and displays the retrieved picture. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image display system, an image input device used therefor, an image display device, and an image display control method. Specifically, an image input device for inputting an image and an image display device for displaying an image have a predetermined configuration. The present invention relates to an image display system connected via a communication interface of a communication standard, an image input device used therein, an image display device, and an image display control method for controlling display of an image on the image display device in the image display system.
[0002]
[Prior art]
Conventionally, a USB (Universal Serial Bus) has been known as a communication interface for connecting a general-purpose computer and a peripheral device. When the computer and the peripheral device are connected by the USB, the computer normally functions as a host and controls the peripheral device subordinately. Therefore, a computer supporting USB is equipped with a host controller for functioning as a host. In the USB standard, a format for transmitting and receiving data to and from a personal computer is defined for each device function, and is defined as a device class. The device class includes a storage class, an HID class, an STI class, a printer class, and the like.
[0003]
A device that directly connects a digital camera and a printer via a USB without using a computer has been proposed (see Patent Document 1). In this technology, a digital camera is connected as a mass storage class device by providing a printer with a host function in accordance with the USB standard, and an image stored in the digital camera is operated by an operation panel provided in the printer. The printer can automatically print without going through a computer.
[0004]
[Patent Document 1]
JP 2001-290612 A (FIG. 1)
[0005]
[Problems to be solved by the invention]
However, as described above, the USB standard presupposes that a computer has a host function and is connected to peripheral devices. Therefore, when devices other than a computer are connected to each other using a USB, The question is whether it is preferable for the device to function as a host. Now, consider a case where a digital camera and a projector as a display device are connected by USB, and an image recorded in the digital camera is reproduced by the projector. At this time, in consideration of improvement in operability, it is preferable that the digital camera be provided with a function as a host in order to enable the reproduction operation by the digital camera alone. However, considering the improvement in portability of digital cameras, it is a reality that digital cameras have a memory area for storing a large amount of device drivers for controlling devices from the host and a host function that requires a large current supply. Not a target.
[0006]
In recent years, the performance of digital cameras has been remarkably improved, and the quality of captured images tends to be high, and the amount of information of recorded images tends to be large. For this reason, when an image such as a slide show is reproduced by the projector, when an image file corresponding to the image is transmitted from the digital camera every time the image to be reproduced is switched, the time required for the process is increased. A large time lag occurs between the transmission of the image file from the digital camera and the reproduction of the image by the projector.
[0007]
Furthermore, many digital cameras have a display panel for displaying a subject at the time of photographing and for confirming the photographed image later. It is convenient to be able to manipulate the display of.
[0008]
The image display system of the present invention and the image input device and the image display device used in the image display device and the image display control method solve the above problems, and operate the image input device to display an image on the image display device. Another object is to further improve the responsiveness of a display device. Further, an image display system, an image input device, an image display device, and an image display control method used in the present invention enable a process of switching an image display on an image display device to be performed with simpler processing. It is one of the purposes. Further, the image display system, the image input device used therefor, the image display device, and the image display control method according to the present invention can perform an image display operation on the image display device while confirming the operation of the image display device with a display unit provided in the image input device. One of the purposes is to make sure that
[0009]
[Means for Solving the Problems and Their Functions and Effects]
An image display system, an image input device, an image display device, and an image display control method used in the present invention employ the following means in order to achieve at least a part of the above object.
[0010]
The image display system of the present invention includes:
An image display system in which an image input device for inputting an image and an image display device for displaying an image are connected via a communication interface of a predetermined communication standard,
(A) The image input device comprises:
Input-side storage means for storing the input image in association with identification information for identifying the image,
Image transmission means for transmitting, when a predetermined first operation is performed, an image stored in the input side storage means to the image display device together with corresponding identification information;
When a desired image is selected from the stored images by a predetermined second operation after the first operation is performed, the identification information corresponding to the selected image is transmitted to the image display device. Means for transmitting information;
With
(B) the image display device comprises:
Image receiving means for receiving the image and the identification information transmitted by the image transmitting means of the image input device,
Output-side storage means for storing the received image in association with the corresponding identification information,
Information receiving means for receiving the identification information transmitted by the information transmitting means of the image input device,
Image search means for searching for a corresponding image from the images stored in the output side storage means based on the received identification information;
Output side display means for displaying the searched image;
The gist is to provide
[0011]
In the image display system of the present invention, the image input device stores the input image together with the identification information for identifying the image in the input side storage means, and when the first predetermined operation is performed, the stored image is stored. Is transmitted together with the corresponding identification information to the connected image display device via a communication interface of a predetermined communication standard. Further, when a desired image is selected from the images stored in the input side storage means by a predetermined second operation after the first operation is performed, the identification information corresponding to the selected image is displayed on the image. Send to device. Then, the image display device receives the image and the identification information transmitted from the image input device, and stores the received image in the output side storage unit in association with the corresponding identification information. Further, the identification information transmitted by the image input device is received, a corresponding image is searched from the images stored in the output side storage means based on the received identification information, and the searched image is displayed. The image data input by the image input device is stored in the image input device in association with identification information for identifying the image, and the same information is transmitted to the image display device when the first operation is performed. Since the image is transmitted and stored, it is only necessary to transmit only the corresponding identification information from the image input device to the image display device when the image is selected by the second operation later, and the image corresponding to the operation of the image input device is obtained. Responsiveness of image display on the display device can be improved.
[0012]
In the image display system of the present invention, the predetermined first operation may be an operation including an operation of selecting a plurality of images to be displayed on the image display device. In this way, unnecessary images that are not to be displayed on the image display device are not transmitted to the image display device.
[0013]
In the image display system according to the present invention, the image input device includes an input-side display unit that displays, when a desired image is selected by the second predetermined operation, the selected image. You can also. In this case, the same image can be displayed on both the image input device and the image display device. In the image display system according to the aspect of the present invention, the predetermined second operation may be an operation of switching display of an image on an input-side display unit of the image display device.
[0014]
Further, in the image display system according to the present invention, the image input device may be an imaging device that captures an image.
[0015]
Alternatively, in the image display system of the present invention, the communication interface of the predetermined communication standard is an interface that communicates so that one controls the other in a dependent manner, and the image input device is dependent on the predetermined communication standard in accordance with the predetermined communication standard. The image display device may further include a non-dependent communication unit that is controlled in accordance with the predetermined communication standard. With this configuration, since the communication between the image input device and the image display device is performed by using the image display device as a host, the image input device and the image display device can be directly connected without passing through a general-purpose computer, and the image input device can be connected. The size of the device can be reduced.
[0016]
The image input device of the present invention includes:
An image input device in an image display system in which an image input device for inputting an image and an image display device for displaying an image are connected via a communication interface of a predetermined communication standard,
Input-side storage means for storing the input image in association with identification information for identifying the image,
Image transmitting means for transmitting, when a predetermined first operation is performed, the image display device having an output-side storage means for storing the stored image together with the corresponding identification information in association with the identification information; ,
When a desired image is selected from the stored images by a predetermined second operation after the first operation is performed, identification information corresponding to the selected image is determined based on the identification information. Information transmitting means for transmitting an image stored in the output side storage means to an image display device for searching and displaying the image,
The gist is to provide
[0017]
In the image input device of the present invention, the input image is stored in association with the identification information for identifying the image, and when the predetermined first operation is performed, the stored image is stored in the image together with the corresponding identification information. Is transmitted to the image display device that stores the information in association with the identification information. Then, when a desired image is selected from the images stored by the predetermined second operation after the first operation is performed, the identification information corresponding to the selected image is stored based on the identification information. The corresponding image is retrieved and transmitted to an image display device for displaying. The image data input by the image input device is stored in the image input device in association with identification information for identifying the image, and the same information is transmitted to the image display device by a first operation and stored. Therefore, when an image is selected by the second operation, only the identification information needs to be transmitted from the image input device to the image display device, and the image display on the image display device in response to the operation of the image input device can be performed. Responsiveness can be improved.
[0018]
In the image input device of the present invention, the predetermined first operation may be an operation including an operation of selecting a plurality of images to be displayed on the image display device. In this way, unnecessary images that are not to be displayed on the image display device are not transmitted to the image display device.
[0019]
The image display device of the present invention includes:
An image display device in an image display system in which an image input device for inputting an image and an image display device for displaying an image are connected via a communication interface of a predetermined communication standard,
Image receiving means for receiving from the image input device an image stored in the image input device and identification information for identifying the image,
Output-side storage means for storing the received image in association with the corresponding identification information,
Information receiving means for receiving the identification information transmitted by the operation of the image input device,
Image search means for searching for the stored image based on the received identification information;
Output side display means for displaying the searched image;
The gist is to provide
[0020]
In the image display device of the present invention, an image stored in the image input device and identification information for identifying the image are received from the image input device, the received image is stored in association with the corresponding identification information, and the image input device stores the received image. The identification information transmitted by the operation from the device is received, the stored image is searched based on the received identification information, and the searched image is displayed. Since the same information as the image stored in the image input device and the identification information for identifying the image is stored in the image display device in advance, the corresponding image is received with good responsiveness only by receiving the identification information from the image input device later. Can be displayed.
[0021]
An image display control method according to the present invention includes:
In an image display system in which an image input device that inputs an image and an image display device that displays an image are connected via a communication interface of a predetermined communication standard, an image display that controls display of an image on the image display device A control method,
The image input device stores the input image in association with identification information for identifying the image, and stores the image together with the corresponding identification information when a predetermined first operation is performed. When a desired image is selected from the stored images by a predetermined second operation after the first operation is performed, the identification information corresponding to the selected image is transmitted to the image. Control to be sent to the display device,
The image display device, the image and the identification information transmitted by the image input device is received, the received image is stored in association with the corresponding identification information, the identification information transmitted by the image input device The gist of the present invention is to receive a received image, search for a corresponding image from the stored images based on the received identification information, and control the displayed image to be displayed.
[0022]
According to the image display control method of the present invention, the input image is stored in the input image together with identification information for identifying the image, and the image stored when a predetermined first operation is performed corresponds to the identification information. The desired image is transmitted from the stored image to the connected image display device via the communication interface of the predetermined communication standard together with the information, and after the first operation, the predetermined second operation is performed. When this is done, control is performed so that the identification information corresponding to the selected image is transmitted to the image display device. The image cover device receives the image transmitted by the image input device together with the corresponding identification information, stores the received image in association with the corresponding identification information, and receives the identification information transmitted by the image input device. Then, a control is performed so that a corresponding image is searched from the stored images based on the received identification information, and the searched image is displayed. The image data input by the image input device is stored in the image input device in association with identification information for identifying the image, and the same information is transmitted to the image display device when the first operation is performed. Since the image is transmitted and stored, it is only necessary to transmit only the corresponding identification information from the image input device to the image display device when the image is selected by the second operation later, and the image corresponding to the operation of the image input device is obtained. Responsiveness of image display on the display device can be improved.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described using examples. FIG. 1 is a configuration diagram schematically showing the configuration of an image display system 20 according to one embodiment of the present invention. As shown in the figure, the image display system 20 of the embodiment is configured such that a digital camera 30 as an image input device and an image display device 40 are connected by a USB communication interface cable 50.
[0024]
The digital camera 30 is mainly composed of a camera controller 31 that controls each unit in response to an input from an operation unit 36, and includes a color liquid crystal display panel 32 that displays a subject and displays necessary for various operations. And a memory for assigning and storing a file ID for identifying an image file to an image file created by the camera controller 31 based on the electric signal from the imaging device 33 34, and a mass storage class USB device controller 35 in the USB standard for communicating with a USB host. The operation unit 36 includes, for example, various operation buttons such as a shutter button 36a, a mode dial 36b, a cross button 36c, a menu button 36d, and an enter button 36e, as shown in FIG. In particular, among the operation buttons constituting the operation unit 36, the mode dial 36b is used for various operations such as a "photographing mode" for photographing the subject and a "playback mode" for reproducing the photographed subject on the color liquid crystal display panel 32. The mode can be selected by dial operation.
[0025]
As shown in FIG. 1, the image display device 40 mainly includes an image display controller 41 that controls each unit, and includes an image display unit 42 that displays an image, and an image file that is displayed on the image display unit 42. And a USB host controller 45 for communicating with a USB device. For example, the image display device 40 can be configured as a display device such as a projector illustrated in FIG.
[0026]
FIG. 4 is a diagram showing a storage structure of the memory 34 of the digital camera 30. As shown in FIG. 4, in the memory 34, a directory (DCIM) for storing a still image is created under a root directory (Root), and directories (100ABC, 102ABC, etc.) for storing image files are created under the DCIM directory. ) Has been created. Image files (ABC0001.JPG, ABC0002.JPG, ABC0003.JPG, ABC0004.JPG, etc.) created by the camera controller 31 are stored in the image file storage directory. Such an image file has a file ID corresponding to the path information of the image file, more specifically, an ID (for example, 100ABC directory) composed of the directory number of the DCIM directory in which the image file is stored and the file number of the image file. The file ID of the image file “ABC0001.JPG” stored in the file is “1000001”.
[0027]
Next, communication in the image display system 20 of the embodiment, that is, communication between the digital camera 30 and the image display device 40 will be described. Communication between the digital camera 30 and the image display device 40 according to the embodiment is performed using a USB device controller 35 and a USB host controller 45. Communication between the USB device controller 35 and the USB host controller 45 includes a control pipe 51 used for transmitting various commands, a bulk pipe 52 used for transmitting data such as image files, and an interrupt, as shown in FIG. This is performed using three logical pipes (communication channels) of the pipe 53. Among these pipes, the interrupt pipe 53 does not specify any communication in the mass storage class in the USB standard. In the image display system 20 of the embodiment, by using the interrupt pipe 53, the image display device 40 is operated by operating the digital camera 30, even though the image display device 40 is a USB host.
[0028]
Specifically, first, a command for inquiring a request from the digital camera 30 from the image display device 40 at an extremely short time (for example, every 1 msec) with respect to the time required for a human operation using the interrupt pipe 53 (in the embodiment, , An interrupt-in command [Interrupt In command]) is transmitted to the digital camera 30 side, and every time this interrupt-in command is received from the digital camera 30, if there is no request, there is no request. A meaning "NAK" is transmitted as a response, and if there is any request, a control command corresponding to the request is transmitted as a response. When the image display device 40 receives a control command from the digital camera 30 as a response to the interrupt-in command, the image display controller 41 of the image display device 40 analyzes the control command and executes an operation corresponding to the control command. You do it. Hereinafter, a process for transmitting an image file stored in the memory 34 of the digital camera 30 from the digital camera 30 to the image display device 40 by using such communication and displaying an image on the image display device 40 will be described.
[0029]
The process of displaying an image from the digital camera 30 on the image display device 40 is executed when an image display (reproduction) on the image display device 40 is requested by the operation of the operation unit 36 by the operator. In response to an image display request to the image display device 40, for example, by operating the mode dial 36b, "playback mode" is selected as the operation mode, and the menu is displayed on the color liquid crystal display panel 32 by pressing the menu button 36d. Then, “external playback” is selected from the displayed menu by operating the cross button 36c, and the determination button 36e is pressed. When “playback mode” is selected as the operation mode of the digital camera 30, the camera controller 31 of the digital camera 30 outputs the latest (last imaged) image (file ID) among the images captured by the digital camera 30. (The image file with the largest (number)) is displayed on the color liquid crystal display panel 32.
[0030]
When display of an image on the image display device 40 is requested, the camera controller 31 of the digital camera 30 generates a control command for requesting display of the image on the image display device 40 and interrupts the control command. It is transmitted to the image display device 40 as a response to the IN command. The image display device 40 reads all the images stored in the memory 34 of the digital camera 30 connected as USB as a storage class together with information for identifying the image (file ID) as an operation of the analysis result of the control command. The read image is stored in the memory 44 in association with the file ID. Then, a process of displaying the image of the image file having the largest file ID on the image display unit 42 as in the digital camera 30 among the read image files is performed. As a result, the same image as the image displayed on the color liquid crystal display panel 32 of the digital camera 30 is displayed on the image display unit 42 of the image display device 40.
[0031]
Thereafter, when an operation of changing the display image on the color liquid crystal display panel 32 is performed, the camera controller 31 of the digital camera 30 performs a process of changing the display image on the color liquid crystal display panel 32 and issues a request to change the display image. A process for transmitting to the display device 40 is performed. To change the image on the color liquid crystal display panel 32, for example, pressing the right button of the cross button 36c switches the display screen to the next image, and pressing the left button of the cross button 36c switches the display screen to the previous image. It was taken. When the right button of the cross button 36c is pressed when the display screen of the color liquid crystal display panel 32 is the last image, the display is switched to the first image, and when the display screen is the first image, the left button of the cross button 36c is pressed. And switch to the last image. The request to change the display image to the image display device 40 is made by transmitting the file ID of the image to be changed to the image display device 40 as a response to the interrupt-in command from the image display device 40. The image display device 40 performs a process of searching for an image file stored in the memory 44 based on the acquired file ID of the image, generating image data from the searched image file, and displaying the image. As described above, by transmitting only the file ID of the image file to the image display device 40 in response to the request for changing the display image, when the display image on the color liquid crystal display panel 32 of the digital camera 30 is changed, the same image is displayed. This can be displayed on the image display unit 42 of the image display device 40.
[0032]
Next, the state of communication between the digital camera 30 and the image display device 40 will be described in further detail. FIG. 6 is a sequence diagram illustrating an example of a communication procedure when a communication connection by USB is established between the digital camera 30 and the image display device 40. The digital camera 30 and the image display device 40 are connected by the USB communication interface cable 50 while the power is on, or the digital camera 30 and the image display device 40 are connected by the USB communication interface cable 50 Is input, first, as shown in the sequence illustrated in FIG. 6, a USB communication connection is established, and the USB host controller 45 of the image display device 40 is switched from the USB device controller 35 of the digital camera 30 to a USB device. A device descriptor describing the configuration is obtained (S100). This device descriptor includes an interface descriptor including a fact that the digital camera 30 is a device of the mass storage class and a string descriptor listing USB endpoints used by the digital camera 30. In the embodiment, the string descriptor listing the endpoints describes the “Interrupt In” endpoint as an additional endpoint. As a result, the USB host controller 45 of the image display device 40 according to the embodiment determines from the interface descriptor and the string descriptor that the digital camera 30 is a mass storage class device and an interrupt-in command (a command for inquiring a request on the USB device side). ) Can be recognized as a device. When the digital camera 30 is connected to the USB port of a normal computer, the device descriptor is sent to the computer in the same manner, but the USB host controller incorporated in the computer ignores the additional “Interrupt In” endpoint. The digital camera 30 operates as a normal mass storage class device for the computer.
[0033]
When the USB communication connection is established between the digital camera 30 and the image display device 40 in this manner, the image display device 40 sends an interrupt-in command at an extremely short time interval (for example, 1 msec interval) using the interrupt pipe 53. Then, a process for transmitting to the digital camera 30 is started (S102 and S108), and a "Confirmation" command for confirming the protocol within a predetermined time after the communication connection is established (S106). By transmitting this command, the image display device 40 notifies that the communication protocol of the type using the interrupt-in command is used, the protocol version, and the like.
[0034]
Each time the digital camera 30 receives the interrupt-in command, the digital camera 30 checks whether any control command has been generated at that point in time. When no control command has been generated, the digital camera 30 sets “NAK” meaning no request, to some form. When the control command is issued, the control command is transmitted to the image display device 40 using the control pipe 51 as a response to the interrupt-in command. In the example of FIG. 6, “StatusReq” which is a control command as a request for acquiring the state of the image display device 40 with the digital camera 30 in response to the interrupt-in command of S108 is displayed from the digital camera 30 as a response. The data is transmitted to the device 40 (S110). The image display apparatus 40 checks the state of the apparatus in response to the control command, and when the apparatus is in a state capable of accepting a display request, sends the control pipe 51 a command "SEND_STATUS" to notify the transmission of the state of the apparatus. Is transmitted to the digital camera 30 by using (S112), and “PLAY_OK”, which is a code in which the device can receive a display request, is written into a predetermined area in the memory 34 of the digital camera 30 by using the bulk pipe 52. (S114). The digital camera 30 displays on the color liquid crystal display panel 32 the state of the image display device 40 thus obtained (a state in which an image display request can be accepted).
[0035]
FIG. 7 is a sequence diagram illustrating an example of a communication procedure when an image display request is issued from the digital camera 30 and an image is displayed on the image display device 40. This sequence is performed when a request to display an image on the image display device 40 is made. First, in the digital camera 30, a control command “PlayReq”, which is a request for notifying that an image display request has been generated by the processing of the camera controller 31, is generated. This control command is transmitted from the digital camera 30 to the image display device 40 using the control pipe 51 in response to the interrupt-in command (S200) transmitted from the image display device 40 (S202). The image display device 40 transmits “GET_PLAYREQ”, which is a command for acquiring an image display request in response to the received “PlayReq” command, to the digital camera 30 by using the control pipe 51 (S204). All the file IDs of the image files stored in the memory 34 are read out through the bulk pipe 52, and the image files of all the images are read out using the file IDs as keys (S204, S206). And stored in the memory 44. In response to the interrupt-in command transmitted from the image display device 40 after accepting the display request in this manner (S208), "StatusReq" which is a control command of the request for acquiring the status of the device from the digital camera 30 is responded to. Is transmitted, the image display device 40 transmits “SEND_STATUS”, which is a command for notifying the transmission of the status of the device, to the digital camera 30 using the control pipe 51 (S212), and the command is normally received. “CMDACPT”, which is a code indicating that the operation has been performed, is transmitted to the digital camera 30 using the control pipe 51 (S214). Note that “id01” immediately after the code “CMDACPT” in the figure is an id number for identifying the display job on the digital camera 30 side. Hereinafter, the same applies to “id01” immediately after other codes. Accordingly, the image display device 40 first performs a process of displaying the image file having the largest file ID among all the read image files on the image display unit 42. At this time, since the digital camera 30 also displays the image file having the largest file ID among the image files stored in the memory 34 on the color liquid crystal display panel 32, the digital camera 30 displays the image file on both the digital camera 30 and the image display device 40. The same image will be displayed. After the digital camera 30 receives the “CMDACPT” code indicating that the “playReq” command has been normally received, the “CIMimageReq” command for requesting a change of a display image, which will be described later, or the end of image display. Unless a “CompleteReq” command for requesting “SEND_STATUS” is generated, the transmission of the “SEND_STATUS” command is continued.
[0036]
When a request to change the display image is made to the digital camera 30 (for example, when the cross button 36c is pressed left or right during image playback), the digital camera 30 uses the color liquid crystal display panel 32 Is generated, a "CImageReq" is generated as a control command requesting the image display device 40 to change the display image, and transmitted to the image display device 40 as a response to the interrupt-in command. In the image display device 40, “GET_CHIMAGEREQ” is transmitted to the digital camera 30 using the control pipe 51 (S220), and the file ID of the changed image file is read out via the bulk pipe 52. Then, the image display device 40 searches the image file stored in the memory 44 using the acquired file ID as a key, generates image data from the searched image file, and processes the image display unit 40 by the processing of the image display controller 41. 42. Therefore, when the display image on the color liquid crystal display panel 32 of the digital camera 30 is changed, the display screen on the image display unit 42 of the image display device 40 is changed so as to synchronize with the change.
[0037]
After such a change operation of the display screen, when a request to end the image display is made, for example, “end external reproduction” is selected by operating the cross button 36c on the menu screen displayed by pressing the menu button 36d. When the enter button 36e is pressed, the digital camera 30 transmits a “CompleteReq” command for requesting termination of image display as a response to the interrupt-in command (S232), and the image display device 40 that has received the transmission transmits the “CompleteReq” command. A process for ending the display of the image is performed. Then, when a “StatusReq” command transmitted from the digital camera 30 in response to the interrupt-in command after receiving the end request is transmitted (S236), “SEND_STATUS” notifying of the transmission of the status of the device is transmitted. The command is transmitted to the digital camera 30 via the control pipe 51 (S238), and “COMPid01”, which is a code indicating that the command has been normally received and the image display has been completed, is transmitted to the digital camera 30 (S240). ), The image display processing ends.
[0038]
According to the image display system 20 of the embodiment described above, when an image display request is made, the image is displayed on the color liquid crystal display panel 32, and all of the image files stored with the file IDs are assigned the file IDs. At the same time, it is transmitted to the image display device 40 in advance and stored in the memory 44 of the image display device 40. When the image display device 40 is requested to change the display of the image, the digital camera 30 displays the image corresponding to the change request on the color liquid crystal display panel 32 and displays the file ID of the image corresponding to the change request. The image is transmitted as a request to display an image on the display device 40, and the image display device 40 searches for an image stored in the memory 44 using the transmitted file ID as a key and displays the image. The same image can be displayed on both of the image display devices 40 with good responsiveness. Further, since the image display device 40 is a USB host and the digital camera 30 is a USB device, the hardware configuration mounted on the digital camera 30 can be simplified. Furthermore, since the digital camera 30 uses a mass storage class of the USB standard and performs processing using an interrupt-in command only at the time of USB connection with the image display device 40, the digital camera 30 is a normal mass storage class. It can be connected to a computer as a class USB device.
[0039]
Here, in the image display system 20 of the embodiment, the digital camera 30 corresponds to an image input device capable of inputting and storing a plurality of images, and one of the devices to which the USB is connected is a predetermined device in which the other is controlled in a dependent manner. It corresponds to a communication standard. In addition, the USB device controller 35 of the digital camera 30 corresponds to a dependent communication means on the side that is dependently controlled in a predetermined communication standard, and the camera controller 31 and the memory 34 convert an image input to the image input device into an image. The camera controller 31 corresponds to an input-side storage unit that stores the image in association with the identification information to be identified, and the camera controller 31 corresponds to an image transmission unit that transmits the stored image together with the corresponding identification information to an image display device in advance. The liquid crystal display panel 32 corresponds to input side display means for displaying an image selected from images stored in the input side storage means by a predetermined operation, and the camera controller 31 selects the selected image. Corresponds to information transmitting means for transmitting the identification information corresponding to the image display device to the image display device. Further, the USB host controller 45 of the image display device 40 corresponds to a non-dependent communication device on the side controlled in a predetermined communication standard, and the image display controller 41 transmits the image transmitted from the image display device to the identification information. The image display controller 41 and the memory 44 correspond to output-side storage means for storing images received by the image display controller 41 and the memory 44 in association with corresponding identification information. The image display controller 41 and the image display unit 42 correspond to an information receiving unit that receives the received identification information and an image search unit that searches for an image stored in the output side storage unit based on the received identification information. It corresponds to an output-side display means for displaying the resulting image.
[0040]
In the image display system 20 of the embodiment, when an image display request is made to the image display device 40, all image files stored in the memory 34 of the digital camera 30 are transmitted to the image display device 40. However, it is not necessary to transmit all the image files, and a part of the image files may be transmitted. At this time, the image file stored in the memory 44 of the image display device 40 becomes a part of the image file stored in the memory 34 of the digital camera 30. There is a case where the image file corresponding to the file ID transmitted from is not present in the memory 44 of the image display device 40. In this case, the image file stored in the memory 34 of the digital camera 30 is read based on the file ID. I just need to put it out. When transmitting a part of the image file stored in the memory 34 of the digital camera 30, the image file to be transmitted may be selected by the operator.
[0041]
In the image display system 20 of the embodiment, the USB is used as a predetermined communication standard in which one of the connected devices controls the other independently, but the communication standard in which the image display device 40 controls the digital camera 30 in a dependent manner. Any communication standard can be used.
[0042]
In the image display system 20 of the embodiment, the digital camera 30 has been described as an example of the image input device. However, any device may be used as long as the device can input and store a plurality of images.
[0043]
In the embodiment, the present invention has been described as the image display system 20. However, the present invention is not limited to the form of the system, and may be a form of the digital camera 30 or the image display device 40 used in the image display system 20. Further, a mode of a control method for controlling the digital camera 30 and the image display device 40 constituting the image display system 20 may be adopted.
[0044]
As described above, the embodiments of the present invention have been described using the examples. However, the present invention is not limited to these examples, and may be implemented in various forms without departing from the gist of the present invention. Obviously you can get it.
[Brief description of the drawings]
FIG. 1 is a configuration diagram schematically illustrating the configuration of an image display system 20 according to an embodiment.
FIG. 2 is a configuration diagram illustrating an external configuration of the digital camera 30;
FIG. 3 is a configuration diagram illustrating an external configuration of an image display device;
FIG. 4 is an explanatory diagram showing a storage structure of a memory 34 of the digital camera 30.
FIG. 5 is an explanatory diagram illustrating a logical pipe used for command transmission and the like;
FIG. 6 is a sequence diagram showing an example of a communication procedure when a communication connection is established.
FIG. 7 is a sequence diagram showing an example of a communication procedure when executing image display.
[Explanation of symbols]
Reference Signs List 20 image display system, 30 digital camera, 31 camera controller, 32 color liquid crystal display panel, 33 shooting device, 34 memory, 35 USB device controller, 36 operation unit, 36a shutter button, 36b mode dial, 36c cross button, 36d menu button , 36e Enter button, 40 image display device, 41 image display controller, 42 image display unit, 44 memory, 45 USB host controller, 50 USB communication interface cable, 51 control pipe, 52 bulk pipe, 53 interrupt pipe.

Claims (10)

An image display system in which an image input device for inputting an image and an image display device for displaying an image are connected via a communication interface of a predetermined communication standard,
(A) The image input device comprises:
Input-side storage means for storing the input image in association with identification information for identifying the image,
Image transmission means for transmitting, when a predetermined first operation is performed, an image stored in the input side storage means to the image display device together with corresponding identification information;
When a desired image is selected from the stored images by a predetermined second operation after the first operation is performed, the identification information corresponding to the selected image is transmitted to the image display device. Means for transmitting information;
With
(B) the image display device comprises:
Image receiving means for receiving the image and the identification information transmitted by the image transmitting means of the image input device,
Output-side storage means for storing the received image in association with the corresponding identification information,
Information receiving means for receiving the identification information transmitted by the information transmitting means of the image input device,
Image search means for searching for a corresponding image from the images stored in the output side storage means based on the received identification information;
An image display system comprising: output side display means for displaying the searched image. The image display system according to claim 1, wherein
The image display system, wherein the predetermined first operation is an operation including an operation of selecting a plurality of images to be displayed on the image display device. The image display system according to claim 1 or 2,
The image input device,
An image display system comprising input side display means for displaying a selected image when a desired image is selected by the predetermined second operation. The image display system according to claim 3, wherein
The image display system, wherein the predetermined second operation is an operation of switching display of an image on an input-side display unit of the image display device. The image display system according to claim 1, wherein:
An image display system, wherein the image input device is an imaging device that captures an image. The image display system according to claim 1, wherein:
The communication interface of the predetermined communication standard is an interface that communicates so that one subordinately controls the other,
The image input device includes a dependent communication unit that is controlled in accordance with the predetermined communication standard,
An image display system, wherein the image display device includes a non-dependent communication unit that performs control in accordance with the predetermined communication standard. An image input device in an image display system in which an image input device for inputting an image and an image display device for displaying an image are connected via a communication interface of a predetermined communication standard,
Input-side storage means for storing the input image in association with identification information for identifying the image,
Image transmitting means for transmitting, when a predetermined first operation is performed, the image display device having an output-side storage means for storing the stored image together with the corresponding identification information in association with the identification information; ,
When a desired image is selected from the stored images by a predetermined second operation after the first operation is performed, identification information corresponding to the selected image is determined based on the identification information. Information transmitting means for transmitting an image stored in the output side storage means to an image display device for searching and displaying the image,
An image input device comprising: The image input device according to claim 7, wherein
The image input device, wherein the predetermined first operation is an operation including an operation of selecting a plurality of images to be displayed on the image display device. An image display device in an image display system in which an image input device for inputting an image and an image display device for displaying an image are connected via a communication interface of a predetermined communication standard,
Image receiving means for receiving from the image input device an image stored in the image input device and identification information for identifying the image,
Output-side storage means for storing the received image in association with the corresponding identification information,
Information receiving means for receiving the identification information transmitted by the operation of the image input device,
Image search means for searching for the stored image based on the received identification information;
An image display device comprising: output side display means for displaying the searched image. In an image display system in which an image input device that inputs an image and an image display device that displays an image are connected via a communication interface of a predetermined communication standard, an image display that controls display of an image on the image display device A control method,
The image input device stores the input image in association with identification information for identifying the image, and stores the image together with the corresponding identification information when a predetermined first operation is performed. When a desired image is selected from the stored images by a predetermined second operation after the first operation is performed, the identification information corresponding to the selected image is transmitted to the image. Control to be sent to the display device,
The image display device, the image and the identification information transmitted by the image input device is received, the received image is stored in association with the corresponding identification information, the identification information transmitted by the image input device An image display control method for receiving a received image, searching for a corresponding image from the stored images based on the received identification information, and controlling to display the searched image.

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