JP2004259089A - Information processing device and information processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information processing device which establishes wireless communication with external devices such as a plurality of projectors and designates a method for encripting information to be transmitted to each of the devices, and also to provide a method therefor. <P>SOLUTION: The wireless utility program 11 of a PDA 1 captures image data displayed on an LCD 19 and transmits the image data by radio to the plurality of wireless projectors 2 by means of a wireless LAN device 13. At that time, the encripted image data are transmitted to the wireless projectors which are set to a security mode, and the image data which are not encripted are transmitted to the wireless projectors which are not set to the security mode. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an information processing apparatus such as a PDA (Personal Digital Assistants) and an information processing method for transmitting image data to an external device such as a liquid crystal projector.
[0002]
[Prior art]
In recent years, various portable information processing devices such as PDAs and notebook personal computers have been developed. Many portable information processing apparatuses have a wireless communication function, and can be wirelessly connected to other information processing apparatuses and various types of consumer electronic devices.
[0003]
As an application system using a wireless communication function of an information processing device, there is known an information display system in which image data wirelessly transmitted from the information processing device is displayed on a large screen by a projector (for example, see Patent Document 1). .). In this information display system, image data stored in a storage device of the information processing device is wirelessly transmitted to the projector. Also, a system for encrypting and transmitting confidential data between a computer and a projector has been developed. (For example, see Patent Document 2.)
[0004]
[Patent Document 1]
JP-A-2002-218420 (page 2, FIG. 1)
[Patent Document 2]
JP-T-2002-503920 (page 17, FIG. 4)
[0005]
[Problems to be solved by the invention]
In an environment in which the information processing device and an external device such as a projector are wirelessly connected, the information processing device may display the same screen image on a plurality of external devices existing within a wirelessly connectable range. Is also possible.
[0006]
However, in the conventional device, there is only one of a mode of wirelessly transmitting information without encryption and a mode of wirelessly transmitting encrypted information to all wirelessly connected external devices. The function which considered the connection environment individually was not maintained.
[0007]
The present invention has been made in view of the above points, and provides an information processing apparatus and an information processing apparatus that can wirelessly communicate with external devices such as a plurality of projectors and that can specify encryption processing of information transmitted to each external device. It is intended to provide a processing method.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an information processing apparatus of the present invention is an information processing apparatus that performs wireless communication with a plurality of external devices that display received image data. Designation means for designating, for each of the external devices, whether or not to perform encryption processing; and an encryption means for performing encryption processing on image data to be transmitted to an external device designated to perform encryption processing by the designation means. Encoding means, and transmission means for wirelessly transmitting the image data subjected to the encryption processing by the encryption means to an external device designated to perform the encryption processing by the designation means. I do.
[0009]
In order to achieve the above object, an information processing method according to the present invention is directed to an information processing method in an information processing apparatus that executes wireless communication with a plurality of external devices that display received image data. A step of designating, for each of the external devices, whether or not to perform an encryption process on the data; and the external device designated to perform the encryption process by the designation step when transmitting image data to the external device. Performing an encryption process on the image data to be transmitted to the device; and transmitting the image data, which has been subjected to the encryption process in the encryption step, to an external device designated to be subjected to the encryption process in the above-mentioned designation step. And transmitting by the following.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a PDA 1 as an information processing apparatus according to an embodiment of the present invention.
[0011]
The PDA 1 is a portable information processing device that functions as a mobile terminal. The PDA 1 has a wireless LAN device 13 and a wireless presentation function. The wireless LAN device 13 is a wireless communication device configured to execute wireless communication in accordance with, for example, the IEEE 802.11a / IEEE 802.11b standard, and transmits and receives various data and transmits identification information of the PDA 1. And a transmission unit / reception unit for receiving device identification information transmitted from an external device.
[0012]
The wireless presentation function is a function of transmitting screen image data of the PDA 1 to the wireless projector 2 by radio, and displaying the image image data on the projection screen of the wireless projector 2. This function is realized using wireless communication between the PDA 1 and the wireless projector 2.
[0013]
A wireless utility program 11, an application program 12, and the like are installed in the PDA 1 in advance. The wireless utility program 11 is a program for controlling a wireless presentation function (wireless communication between the PDA 1 and the wireless projector 2). The application program 12 is, for example, a presentation program that generates screen image data and executes a slide show of the generated screen image data.
[0014]
When the image data is generated by the application program 12, the generated image data is drawn in the video memory (VRAM) 15 via the display driver 14. This image data is converted as necessary to correspond to the display resolution of the LCD 19 provided as a display device of the PDA 1 and displayed on the LCD 19 under the control of the graphics controller 18.
[0015]
Upon receiving a command input from a user (not shown), the wireless utility program 11 captures screen image data displayed on the LCD 19, compresses and encodes the captured screen image data, and then converts the captured screen image data into compressed wireless LAN device 13 Is transmitted to the wireless projector 2 using a wireless signal.
[0016]
The wireless utility program 11, as will be described later, encrypts the compressed and encoded image data, which is compressed and encoded as necessary, and uses the wireless LAN device 13 as the encrypted data. Send to
[0017]
In this embodiment, the wireless utility program 11 captures the updated image data only when the image data drawn in the VRAM 15 is updated, and sends the updated image data to the wireless projector 2 via the wireless LAN device 13. Send. Instead, in the present embodiment, it is assumed that the image data is not transmitted from the PDA 1 to the wireless projector 2 during a period in which the content of the image data does not change, but the present invention is not limited to this. .
[0018]
On the other hand, the wireless projector 2 also includes the wireless LAN device 21. The wireless LAN device 21 is a wireless communication device configured to execute wireless communication in accordance with, for example, the IEEE 802.11a / IEEE 802.11b standard, and transmits and receives various data and receives identification information of the PDA 1. Or a transmission unit / reception unit for transmitting external device identification information.
[0019]
The wireless projector 2 receives compressed image data or encrypted data via the wireless LAN device 21. Further, when the wireless projector 2 receives the compressed image data or the encrypted data to be received by the wireless projector, the wireless projector 2 decrypts the received encrypted data and receives the received compressed image data or the decrypted compressed and encoded data. The decoded image data is subjected to decompression decoding.
[0020]
Then, the wireless projector 2 writes the image data into the frame buffer, and projects an optical image corresponding to the image data stored in the frame buffer onto a large screen for projection.
[0021]
Next, a system configuration of the PDA 1 will be described with reference to FIG. The PDA 1 includes a CPU 101, a memory 102, a system controller 103, a tablet controller 105, an I / O controller 106, a memory card 107, as shown in the figure, in addition to the above-described wireless LAN device 13, VRAM 15, graphics controller 18 and LCD 19. A button group 108 and a tablet 112 are provided.
[0022]
The CPU 101 is a processor provided to control the operation of the PDA 1, and executes an operating system (OS), various application programs / utility programs, an encryption processing program, and the like. The operating system (OS) has a tablet control function for implementing a pen input operation.
[0023]
The memory 102 includes a non-volatile memory storing an operating system (OS) and various application programs / utility programs, and a RAM used as a main memory.
[0024]
The non-volatile memory stores a program for performing an encryption process in addition to the wireless utility program 11 and the application program 12 described above. The RAM stores the device identification information received via the wireless LAN device 13 and various mode settings (for example, ON / OFF of a security mode described later) set corresponding to the device identification information.
[0025]
The system controller 103 is a bridge device that connects between the local bus of the CPU 101 and the system bus 100. The system controller 103 also has a built-in memory controller for controlling the memory 102. The graphics controller 18 displays screen image data drawn on the VRAM 15 on the LCD 19 by controlling an LCD 19 used as a display device of the PDA 1.
[0026]
The VRAM 15 has an on-screen area and an off-screen area. The off-screen area is a storage area for storing image data generated by the application program 12. In this embodiment, the wireless utility program 11 captures the screen image data stored in the off-screen area of the VRAM 15.
[0027]
The on-screen area is a storage area for storing screen image data displayed on the LCD 19, and is used as a frame buffer. The graphics controller 18 sequentially reads out the screen image data from this on-screen area via the display driver 14 and displays it on the LCD 19.
[0028]
The tablet controller 105 controls the tablet 112. The tablet 112 includes a transparent coordinate detection device provided on the display surface of the LCD 19, and detects a position (coordinate) specified from the outside. The LCD 19 and the tablet 112 constitute a touch screen on which a pen input operation can be performed.
[0029]
The I / O controller 106 controls the memory card 107 detachably mounted on the PDA 1 and controls the operation button group 108. The operation button group 108 includes, for example, a plurality of operation buttons such as a power button, an application button for starting a specific application, a cursor key, and the like.
[0030]
A process of transmitting image data from the PDA 1 to the wireless projector 2 under such a system configuration will be described below. Here, it is assumed that image data is transmitted to the wireless projector 2 while being displayed on the LCD 19.
[0031]
The application program 12 executes, for example, a slide show for sequentially displaying a plurality of image data on the LCD 19. In the slide show, the application program 12 sequentially generates image data, and draws the image data in an off-screen area of the VRAM 15 via the display driver 14. Further, from this screen image data, image image data actually displayed on the LCD 19 is generated and drawn in the on-screen area of the VRAM 15. The graphics controller 18 reads out image data from the on-screen area and displays it on the LCD 19.
[0032]
The wireless utility program 11 reads out the image data generated by the application program 12 from the off-screen area via the display driver 14 and performs a compression encoding process on the image data and an encryption process according to the security mode setting. Thereafter, the data is supplied to the wireless LAN device 13 as transmission data.
[0033]
When transmitting from the wireless LAN device 13 to the plurality of wireless projectors 2, the encrypted data / compressed image data to be transmitted is provided with an identifier such as device identification information of the wireless projector 2. The projector 2 can determine whether the data is data to be received. The encryption process performed on the encrypted data is also performed by using an encryption key based on an identifier such as device identification information of the wireless projector 2 or an encryption key previously exchanged with the wireless projector 2. I do.
[0034]
Through the above processing, it is possible to transmit the original image data used for generating the image data to the target wireless projector 2 accurately while displaying the image data on the LCD 19.
[0035]
Next, a system configuration of the wireless projector 2 will be described with reference to FIG. The wireless projector 2 includes an operation button 201, a controller 202, an image decoding unit 203, an image output unit 204, a liquid crystal panel 205, and the like as shown in the figure, in addition to the wireless LAN device 21 described above.
[0036]
The user can operate the operation button 201 to perform a power operation of the wireless projector 2, an operation at the time of projection, and the like. The controller 202 controls the wireless projector 2 and executes processes such as input from the operation buttons 201 and reception of commands via the wireless LAN device 21.
[0037]
Further, the controller 202 receives the encrypted data / compressed image data received via the wireless LAN device 21 because the identifier such as the device identification information of the wireless projector 2 is added to the encrypted data / compressed image data. If it is determined that the data is power data, it outputs the received encrypted data / compressed image data to the image decryption unit 203.
[0038]
The image decoding unit 203 performs decoding on the received encrypted data, and performs decompression decoding on the received compressed image data / the decoded compression-encoded image image data. The image decoding unit 203 may be realized by hardware processing such as a decoder chip or software processing by a processor and software. The decryption is performed using an encryption key based on an identifier such as device identification information of the wireless projector 2 or an encryption key previously exchanged with the wireless projector 2.
[0039]
The controller 202 outputs the image data decoded by the image decoding unit 203 to the image output unit 204 and writes the image data in the frame buffer. The image output unit 204 displays an image corresponding to the image data stored in the frame buffer on the liquid crystal panel 205, and transmits the light from the light source to the liquid crystal panel to project the image on a large screen for projection. .
[0040]
Next, FIGS. 4 to 7 illustrate details of the wireless presentation function provided by the wireless utility program 11. FIG.
FIG. 4 shows a wireless utility window 301 displayed on the LCD 19 by the wireless utility program 11. When the wireless utility program 11 is started by the user, a wireless utility window 301 is displayed on the LCD 19 screen.
[0041]
As shown, the wireless utility window 301 includes a transmission indicator 302, a [GO] button 303, a [STOP] button 304, a [Security] check box 305, a projector list 307, and an [individual Security] check button 309. I have.
[0042]
The transmission indicator 302 indicates a state of communication between the PDA 1 and the wireless projector 2. [GO] button 303 is a button for instructing start of a wireless presentation function for automatically transmitting screen image data from PDA 1 to wireless projector 2. When the [GO] button 303 is tapped (clicked) by the user's pen operation, the wireless presentation function is started. [STOP] button 304 is a button for instructing stop of the wireless presentation function.
[0043]
The projector list 307 displays a list of wireless projectors existing within a range where a wireless signal transmitted from the PDA 1 can reach. That is, a list of device identification information (for example, MAC address) corresponding to each wireless projector detected by the wireless utility program 11 is displayed in the projector list 307.
[0044]
In the projector list 307, a check box is displayed for each device identification information of each wireless projector. By tapping this check box, the user can select a destination projector to which the image data is to be transmitted.
[0045]
For example, consider an environment in which a wireless projector is installed in each of a plurality of adjacent conference rooms. As shown in FIG. 5, a PDA 1 and one wireless projector 2A (device identification information: 00003D518FF1) are set in the conference room A. One wireless projector 2B (device identification information: 00003D518FF3) is installed in the conference room B adjacent to the conference room A. One wireless projector 2C (device identification information: 00003D518FF2) is installed in the conference room C adjacent to the conference rooms A and B.
[0046]
Then, it is assumed that the meeting room A and the meeting room B are used at the same time under the same case, but the meeting room C is used for a completely different case by a third party. However, the PDA 1 in the conference room A has three wireless projectors 2A, 2B, and 2C installed within its communicable range, and can communicate with each of the plurality of wireless projectors 2A, 2B, and 2C.
[0047]
As a result, a list of device identification information corresponding to each of the three communicable wireless projectors 2A to 2C is displayed in the projector list 307 of the wireless utility window 301 shown in FIG.
[0048]
In such a display state of the wireless utility window 301, the check box in the projector list 307 allows the user to select the other projector, thereby preventing the image data from being erroneously transmitted to the unintended projector. It can be prevented beforehand. Further, the [GO] button 303 is not displayed on the wireless utility window 301 until the destination projector is selected by the user.
[0049]
In the projector list 307 of the wireless utility window 301 shown in FIG. 4, check boxes corresponding to two pieces of device identification information “00033D518FF1” and “00033D518FF2” are checked as projectors to which image data is transmitted. Therefore, in the situation shown in FIG. 5, the PDA 1 wirelessly transmits image data to the two wireless projectors 2A and 2B, and does not wirelessly transmit image data to the wireless projector 2C.
[0050]
In the wireless utility window 301 shown in FIG. 4, an [individual security] check button 309 is further displayed for each device identification information of each wireless projector listed in the projector list 307. By tapping the [Individual Security] check button 309, the user can select a projector to be encrypted and transmitted with the image data.
[0051]
In the [Individual Security] check button 309 of the wireless utility window 301 shown in FIG. 4, a check box corresponding to one piece of device identification information "00033D518FF2" is checked as a destination projector to which image data is to be encrypted and transmitted. ing.
[0052]
As a result, the wireless utility program 11 outputs the corresponding device identification information (“00033D518FF2” in FIG. 5) from the plurality of device identification information (“00033D518FF1”, “00033D518FF2”, and “00033D518FF3”) stored in the memory 102. The security mode setting corresponding to ()) is turned ON. Further, the setting of the security mode corresponding to the device identification information “00033D518FF1” and “00033D518FF3” is OFF.
[0053]
Therefore, in the situation shown in FIG. 5, the PDA 1 encrypts the image data and wirelessly transmits the encrypted image data to the wireless projector 2B disposed at a remote position (adjacent conference room B), and transmits the encrypted data to the same room (conference room) as the PDA 1. The unencrypted image data is wirelessly transmitted to the wireless projector 2A arranged in A). In addition, the wireless projector 2C installed in the conference room C can receive particularly encrypted image data through the wireless LAN device 21, but the identifier assigned to the received data is different, And so on, the data content cannot be confirmed by the wireless projector 2C which is not the transmission target.
[0054]
In the wireless utility window 301 shown in FIG. 4, a [Security] check box 305 is further displayed. The [Security] check box 305 is used to allow the user to specify whether to encrypt the image data to be transmitted.
[0055]
Then, when the [Security] check box 305 is checked by the user, the wireless utility program 11 automatically checks all the [Individual Security] check buttons 309 and sets the security mode as shown in FIG. Is done.
[0056]
That is, the wireless utility program 11 turns on the security mode setting for all of a plurality of device identification information (“00033D518FF1”, “00033D518FF2”, and “00033D518FF3” in FIG. 5) stored in the memory 102.
[0057]
Therefore, in the situation shown in FIG. 5, even if the PDA 1 is the wireless projector 2A arranged in the same room (meeting room A) as the PDA 1, the PDA 1 is the wireless projector 2B arranged in a remote position (adjacent meeting room B). Even in this case, the image data is encrypted and transmitted wirelessly.
[0058]
As described above, the wireless utility program 11 sets the security mode setting to “ON” for the partner projector for which the “individual security” check button 309 is checked.
[0059]
When the security mode is set to “ON”, the wireless utility program 11 transmits image data to be transmitted to the destination projector set to the security mode “ON” in advance to the wireless projector 2 (2A or 2B). ) Is encrypted using the encryption key exchanged, and then transmitted. As a result, it becomes possible to decrypt the encrypted data received only by the wireless projector that exchanged the encryption key.
[0060]
An instruction means for designating whether or not to perform encryption processing on image data to be transmitted to each external device such as the wireless projector 2 by setting an [individual security] check button 309 and a security mode, and a first instruction unit. Instruction means is configured. The [Security] check button 305 and the setting of the security mode constitute second instruction means for designating whether or not to perform encryption processing on image data to be transmitted to all of the plurality of external devices.
[0061]
When the [GO] button 303 is tapped by the user, the wireless utility window 301 is minimized and stored in the command bar 402 as an icon 403 as shown in FIG. At the same time, the application program is started, and the operation window 401 of the application program is displayed on the LCD 19.
[0062]
If the icon 403 is tapped by the user, the wireless utility window 301 will be displayed again. When the [STOP] button 304 is tapped, the execution of the wireless presentation function is stopped.
[0063]
Next, the procedure of the wireless presentation process executed by the wireless utility program 11 in the setting environment using the wireless utility window 301 shown in FIG. 4 will be described with reference to the flowcharts of FIGS.
[0064]
The description of the compression encoding process and the encryption process is omitted because a known technique is used. However, the encrypted image data can be decrypted only by the corresponding wireless projector in the security mode, and cannot be decrypted by the incompatible wireless projector.
[0065]
As shown in FIG. 8, when the wireless utility program 11 is started, the wireless utility program 11 displays a wireless utility window 301 and then detects a wireless projector existing around the PDA 1 (step ST11). In step ST11, a device discovery process (device discovery process) for detecting a device that can communicate with the PDA 1 is executed.
[0066]
That is, the wireless utility program 11 broadcasts a device discovery command for device discovery using the wireless LAN device 13 and waits for a response to the device discovery command.
[0067]
When each of the wireless projectors 2 (for example, 2A to 2C) receives the device discovery command, the PDA 1 sends a response including the MAC address assigned to its own wireless LAN device 21 and an identifier indicating its own device type (= projector) to the PDA 1. return. With this response, the wireless utility program 11 can detect each wireless projector existing within the range where the wireless signal transmitted from the PDA 1 reaches.
[0068]
Then, the wireless utility program 11 displays a list of detected wireless projectors on the projector list 307 (step ST12). When a certain wireless projector on the projector list 307 is selected by the user (YES in step ST13), the wireless utility program 11 displays a [GO] button 303 on the wireless utility window 301 (step ST14).
[0069]
When [GO] button 303 is tapped by the user (YES in step ST15), wireless utility program 11 checks whether there is a wireless projector whose security mode is set to “ON” (step ST16).
[0070]
In this step ST16, the [individual Security] check button 309 in the wireless utility window 301 is checked, and if it is determined that there is a wireless projector whose security mode is set to “ON” (Yes in step ST16), the wireless utility The program 11 skips the processing of steps ST17 to ST18 and proceeds to the processing of step ST19.
[0071]
In this step ST16, if none of the [individual Security] check buttons 309 in the wireless utility window 301 are checked and there is no wireless projector with the security mode set to “ON” (No in step ST16), The utility program 11 displays a confirmation screen on the LCD 19 of the PDA 1 for asking the user whether to execute transmission of the image data without encryption (step ST17).
[0072]
In response to the confirmation screen displayed in step ST17, when a reset is instructed by the user, the wireless utility program 11 displays a wireless utility window 301 on the LCD 19, returns to the process of step ST12, and again executes the wireless utility program. The window 301 is now in a state where various settings can be changed.
[0073]
After receiving the confirmation screen displayed in step ST17, if the user instructs data transmission without encryption, the wireless utility program 11 proceeds to step ST19.
[0074]
When the [GO] button 303 is tapped by the user (Yes in step ST15, Yes in ST16, Yes in ST18), the wireless utility program 11 selects the wireless projector 2 selected from the projector list 307 as shown in FIG. A connection request is transmitted as an image data transmission request to establish a wireless connection with the selected wireless projector 2 (step ST19).
[0075]
In this step ST19, not only a physical wireless link between the PDA 1 and the selected wireless projector 2 is established, but also a session therebetween. That is, the PDA 1 also executes a session for generating and transmitting / receiving an encryption key used for encryption processing / decryption processing within the PDA 1 with each wireless projector 2 that has established a wireless link.
[0076]
After the wireless connection with the wireless projector 2 is established in step ST19, the wireless utility program 11 minimizes the wireless utility window 301 and activates the application program 12 as shown in FIG. 7 (step ST20). .
[0077]
The activated application program 12 starts a slide show for sequentially drawing the generated image data in the off-screen area of the VRAM 15. Further, the wireless utility program 11 acquires image data from the off-screen area of the VRAM 15 (step ST21).
[0078]
That is, the wireless utility program 11 issues to the display driver 14 a command requesting reading of screen image data from the off-screen area of the VRAM 15 in step ST21. The display driver 14 reads out screen image data from the off-screen area via the graphics controller 18 and passes it to the wireless utility program 11.
[0079]
The wireless utility program 11 determines whether the image image data has been updated by comparing the newly acquired screen image data with the screen image data previously transmitted in step ST27 described later (step ST22).
[0080]
If it is determined that the screen image data acquired in step ST22 is the same as the previously transmitted screen image data (No in step ST23), the wireless utility program 11 performs a process of acquiring image image data (step ST21). ) And a process of determining whether or not the acquired image data is different from the image data transmitted last time (steps ST22 and ST23) is repeatedly executed at regular time intervals.
[0081]
If it is determined that the screen image data acquired in step ST22 is different from the screen image data transmitted last time, the wireless utility program 11 recognizes that the image image data has been updated by the application program 12, Is determined to be data to be transmitted. The image data acquired first after the [GO] button 303 is pressed is unconditionally determined to be data to be transmitted.
[0082]
If it is determined that the acquired image data is data to be transmitted (Yes in step ST23), the wireless utility program 11 performs compression encoding on the acquired image data (step ST24). Next, the wireless utility program 11 determines whether or not the security mode is set to “ON” for each wireless projector 2 (2A, 2B) set to transmit (step ST25).
[0083]
For the wireless projector 2 (2B) for which the security mode is set to “ON” (Yes in step ST25), the wireless utility program 11 encrypts the image data compressed and encoded using the encryption key. Then, it is transmitted (step ST26) and transmitted using the wireless LAN device 13 (step ST27).
[0084]
For the wireless projector 2 (2A) for which the security mode is set to “OFF” (No in step ST25), the wireless utility program 11 skips the processing in step ST26 and performs the compression encoding in step ST24. The image data is transmitted as compressed image data using the wireless LAN device 13 (step ST27).
[0085]
Until the user taps the [STOP] button 304, the wireless connection between the PDA 1 and the projector 2 is maintained. During the period in which the wireless connection is maintained, steps ST21 to ST27 are repeatedly executed.
[0086]
In the case where it takes time to encrypt the image data compressed and encoded, the security mode “OFF” for transmitting the data without encryption and the security mode “ON” for transmitting the data after encryption are performed. In the case where wireless projectors of the type described above are mixed, the wireless utility program 11 of the PDA 1 executes compression-encoded image image data (data for transmission to a wireless projector that transmits data without encryption). ) Is temporarily stored until the encryption processing of the compression-encoded image data is completed.
[0087]
Then, when the encryption process is completed, the wireless utility program 11 compresses and encodes the encrypted image data into the wireless projector 2 (2B) set in the security mode. (Not shown) image data can be sequentially transmitted to the corresponding wireless projector 2 (2A).
[0088]
As a result, the wireless utility program 11 wirelessly transmits image image data to both the wireless projector in the security mode “ON” and the wireless projector in the security mode “OFF” that transmits without encryption. It becomes possible.
[0089]
Next, referring to FIG. 10, communication performed between one PDA 1 and two wireless projectors 2 (2A, 2B) of three wireless projectors 2 (2A, 2B, 2C). Will be described.
[0090]
When activated, the wireless utility program 11 of the PDA 1 displays a wireless utility window 301 on the LCD 19 and then executes a device discovery process for detecting a wireless projector existing around the PDA 1. In the case shown in FIG. 10, three wireless projectors 2A, 2B, and 2C are detected by the device discovery process.
[0091]
Then, when necessary settings are checked in the wireless utility window 301 displayed on the LCD 19 of the PDA 1 and the [GO] button 303 is tapped, the wireless utility program 11 opens the projector list 307 of the wireless utility window 301. A connection request command is transmitted to the wireless projector 2 (2A, 2B) checked in the check box as an image data transmission request.
[0092]
When there is no other device transmitting image data to the wireless projector 2 (2A, 2B), the connection permission is notified to the PDA 1 from each wireless projector 2 (2A, 2B). When the wireless projector 2 notifies the PDA 1 of the connection permission, the wireless connection between the PDA 1 and the wireless projector 2 is established. In addition, transmission and reception of an encryption key used for later encryption processing are performed.
[0093]
When activated, the application program 12 of the PDA 1 starts a slide show. Each time the application program 12 writes new image data to the VRAM 15, the wireless utility program 11 of the PDA 1 automatically transmits the image data to the wireless projector 2 (2A, 2B) wirelessly.
[0094]
At this time, the wireless utility program 11 of the PDA 1 performs compression encoding on the wireless projector 2A for which the [Individual Security] check button 309 of the wireless utility window 301 is not checked and the security mode is set to “OFF”. The processed image data is transmitted wirelessly.
[0095]
Also, the wireless utility program 11 of the PDA 1 performs the compression encoding process on the wireless projector 2A for which the [Individual Security] check button 309 of the wireless utility window 301 is checked and the security mode is set to “ON”. After that, the image data which has been subjected to the encryption processing is transmitted wirelessly.
[0096]
When the [STOP] button 304 is tapped in the wireless utility window 301 displayed on the LCD 19 of the PDA 1, the wireless utility program 11 sends the wireless utility program 11 to the wireless projector 2 (2A, 2B) that has been performing wireless communication. A disconnection request command is transmitted as an image data disconnection request.
[0097]
As described above, in the present embodiment, when the PDA 1 as the information processing apparatus transmits data wirelessly to a plurality of external devices, ie, the wireless projector, whether the transmission data is encrypted for each external device to maintain security. You can set whether or not. For this reason, security can be set according to the wireless connection environment with each external device. Even if the transmission data is received by a malicious third party, the contents of the transmission data can be protected because the transmission data is encrypted.
[0098]
【The invention's effect】
As described above, according to the present invention, it is possible to wirelessly communicate with external devices such as a plurality of projectors, and it is possible to specify encryption processing of information transmitted to each external device.
[Brief description of the drawings]
FIG. 1 is an exemplary block diagram for explaining a function of a PDA 1 as an information processing apparatus according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a system configuration of the PDA 1.
FIG. 3 is a block diagram showing a system configuration of the projector 2.
FIG. 4 is a diagram showing an example of a wireless utility window 301 displayed on the display device of the PDA 1.
FIG. 5 is a diagram illustrating a wireless communication environment between a PDA 1 and a plurality of projectors 2.
FIG. 6 is a diagram showing an example of a wireless utility window 301.
FIG. 7 is a view showing a state where a wireless utility window 301 is minimized.
FIG. 8 is an exemplary flowchart showing the procedure of a wireless presentation process to the wireless projector 2 executed by the PDA 1.
FIG. 9 is an exemplary flowchart showing the procedure of a wireless presentation process to the wireless projector 2 executed by the PDA 1.
FIG. 10 is a view showing a state of communication executed between a PDA 1 and a plurality of projectors 2;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... PDA, 2, 2A-2C ... Wireless projector, 11 ... Wireless utility program, 12 ... Application program, 13, 21 ... Wireless LAN device, 15 ... VRAM, 303 ... [GO] button, 305 ... [Security] check box , 307 ... Projector list, 309 ... [Individual Security] check button.

Claims (9)

In an information processing apparatus that performs wireless communication with a plurality of external devices that display received image data,
Designation means for designating, for each of the external devices, whether to perform an encryption process on the image data to be transmitted to the external device;
Encrypting means for performing encryption processing on image data to be transmitted to an external device designated to perform encryption processing by the designation means;
Transmitting means for wirelessly transmitting the image data subjected to the encryption processing by the encryption means to an external device designated to perform the encryption processing by the designation means;
An information processing apparatus comprising: When the image data is transmitted to the external device, the image processing apparatus has a determination unit that determines whether the encryption process is specified by the specification unit. 2. The information processing apparatus according to claim 1, wherein the encryption unit performs encryption processing on the image data to be transmitted to the external device determined to be encrypted. Holding input screen information that is provided for each of the external devices in correspondence with the specifying unit and that indicates an input unit for specifying whether to perform encryption processing on image data to be transmitted to the external device; The information processing apparatus according to claim 1 or 2, wherein: The above designation means,
First specifying means for specifying, for each of the external devices, whether or not to perform encryption processing on the image data to be transmitted to the external device;
Second specifying means for specifying whether or not to perform encryption processing on the image data transmitted to all of the plurality of external devices;
The information processing apparatus according to claim 1, wherein the information processing apparatus includes: A first input unit provided for each of the external devices corresponding to the first specifying means for specifying whether or not to perform an encryption process on image data to be transmitted to the external device; And a second input unit for specifying whether or not to perform encryption processing on the image data to be transmitted to all of the plurality of external devices corresponding to the second specifying means. The information processing apparatus according to claim 4, wherein When transmitting the image data to the external device, if none of the plurality of external devices is specified to perform the encryption process by the specifying unit, the image data is transmitted without performing the encryption process. The information processing apparatus according to claim 1, further comprising a notification unit configured to notify the user. In an information processing method in an information processing apparatus that performs wireless communication with a plurality of external devices that display received image data,
Specifying for each external device whether or not to perform encryption processing on the image data to be transmitted to the external device;
When transmitting image data to the external device, performing an encryption process on the image data to be transmitted to the external device that is specified to perform the encryption process by the specifying step,
Wirelessly transmitting the image data that has been subjected to the encryption processing in the encryption step to an external device that is specified to perform the encryption processing in the specification step;
An information processing method comprising: A step of determining whether or not an encryption process is specified by the specification unit when transmitting the image data to the external device. As a result of the determination step, the user is specified to perform the encryption process. 8. The information processing apparatus according to claim 7, wherein the image data to be transmitted to the external device determined to be encrypted is subjected to an encryption process in the encryption step. When transmitting the image data to the external device, if none of the plurality of external devices is designated to perform the encryption process by the designation step, the image data is transmitted without performing the encryption process. 8. The information processing method according to claim 7, further comprising a step of notifying the user.

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