JP6700355B2 - Display device - Google Patents

Description

  The present invention relates to a technique for displaying video information from a video device connected to a display device via an interface on the display device.

  In order to connect a video device and a video display device, which is another video device, to view a video or the like, a method of transmitting a video signal and an audio signal by analog connection has been used. However, with the spread of digital devices, a method of digitally connecting and encrypting and transmitting a video signal and an audio signal is used from the viewpoint of preventing image quality deterioration and protecting copyright.

  As one example of digital transmission, one using one cable conforming to the IEEE 1394 standard is known. This is a method in which mutual authentication is performed between transmitting and receiving devices, a video signal and an audio signal are multiplexed after the authentication, and the multiplexed data is subjected to encryption processing called DTCP and transmitted.

  As another example, the HDMI method is known. In the HDMI system, a baseband signal of a high definition video signal and an audio signal are time-division multiplexed and encryption processing called HDCP is performed to enable transmission.

  Such a conventional technique for multiplexing and transmitting a digitized video signal and audio signal is disclosed in, for example, Patent Document 1 below.

JP, 2002-232377, A

  Since the IEEE 1394 standard is used as a network and the transmission rate at which it can be transmitted and received is limited, it is not possible to send a high-definition video signal with a large amount of information as it is as a baseband signal. Therefore, the IEEE 1394 standard has a problem in that the baseband signal must be compressed to reduce the transmission rate for transmission. On the other hand, the HDMI system does not consider that the device that receives the transmitted high-definition video signal records the received signal.

  In addition, all of these methods are premised on the connection between stationary devices placed in the home, so that it is possible to conveniently connect a portable device such as a digital camera or a mobile phone to a video display device. The consideration was not enough.

  The present invention has been made in view of the above problems, and is a technique for improving convenience when displaying an image obtained by a portable image device such as a camera or a mobile phone on a display device. Is provided.

  The present invention transmits an image acquisition request for acquiring the image information from an external video device to the external video device, which is connected to the display device via a predetermined interface, at a predetermined cycle interval. According to the above, a plurality of pieces of video information are acquired from the external device and can be displayed.

  The plurality of images thus obtained may be displayed in a so-called slide show format, for example, by switching and displaying at a predetermined cycle interval. Further, a plurality of thumbnail images may be generated from the plurality of pieces of video information and displayed side by side on one screen of the display unit.

  According to the present invention, it is possible to improve convenience when displaying an image obtained by a portable image device such as a camera or a mobile phone on a display device.

FIG. 1 is a diagram showing an example of a system including a video device and a video display device according to an embodiment of the present invention. The figure which shows an example of the video equipment 100 which concerns on embodiment of this invention. It is explanatory drawing which showed the order of compression signal processing. The figure which shows an example of the video display apparatus 200 which concerns on embodiment of this invention. The figure which shows the other example of the video display apparatus 200 which concerns on embodiment of this invention. The figure which shows an example of the system which connected two video equipments. The figure which shows an example of the system which connected the video display apparatus and the video equipment. The figure which shows an example of the system which wirelessly connected two video equipments. The figure which shows the other example of the system which wirelessly connected two video equipments. The figure which shows one Example of the video display apparatus which concerns on this invention. The figure which shows the other Example of the video display apparatus which concerns on this invention. The figure which shows an example of a thumbnail display in a present Example. The figure which shows the other example of a thumbnail display in a present Example. The figure which shows the other example of a thumbnail display in a present Example. The figure which shows an example of the attribute information corresponding to each still image memorize|stored in the memory 1018 of the video equipment 1020. The figure which shows one structural example of an HDMI interface. The figure which shows an example of the format of a remote control code. The figure which shows an example of the method of transmitting a remote control code by a CEC line. The figure which shows an example of the table of the manufacturer code and apparatus code corresponding to each interface memorize|stored in the video display apparatus 200.

  Preferred embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a first embodiment of the present invention. In FIG. 1, for example, three video devices are shown as the video devices. One is a video device 100, which is, for example, a portable video device capable of receiving a digital broadcast signal from the base station antenna 20 of the mobile phone or the broadcast transmission tower 30, one is a video display device 200, and the other is , A receiver 300, such as a tuner, capable of receiving a digital broadcast signal from the broadcast transmission tower 30. The video equipment 100 and the video display device 200 are connected by, for example, the bidirectional interface 10, and the video display device 200 and the receiver 300 are connected by another bidirectional interface 11. This enables bidirectional communication of video signals, other information, and signals between each device.

  In this embodiment, the portable video device 100 is specifically a digital camera, a video camera, a mobile phone, a game machine, a personal media player, or the like. The constituent elements required for each form are not necessarily the same, but the embodiment shown in FIG. 1 mainly describes the constituent elements necessary for input/output with the outside.

  In FIG. 1, a base station antenna 20 of a mobile phone and an antenna 102 of a video device 100 send and receive signals. When the video equipment 100 is used as a mobile phone, signal processing as a normal mobile phone is performed. The video equipment 100 can also receive contents such as movies transmitted from the base station antenna 20 of the mobile phone. In this case, the content can be viewed on a display device and an audio output device built in the video equipment 100, or can be viewed on a large screen on the external video display device 200 via the terminal 101, the connection cable 10 and the terminal 201. You can also Further, the content is recorded in a storage medium built in the video equipment 100 or a storage medium connected to the video equipment 100 (for example, the memory 121) in order to view the content while viewing the content or later. You can also do it. The memory 121 can also be used as a recording medium for recording a movie or the like.

  Similarly, the program broadcast from the broadcast transmission tower 30 can be received by the broadcast receiver 180 of the video equipment 100 and viewed by the video equipment 100, or a storage medium (not shown) built in the video equipment 100. ) Or a connected storage medium (for example, the memory 121). Further, it can be viewed on the video display device 200 via the terminal 101, the connection cable 10 and the terminal 201.

  A program broadcast from the broadcast transmission tower 30 is received by a receiving antenna 310 connected to the receiver 300, input to the receiver 300 via an antenna terminal 302, and subjected to appropriate signal processing, and then the terminal 301. , And is viewed on the video display device 200 via the connection cable 11 and the terminal 202. Further, the program can be stored in the memory 321 at the same time as the viewing, or via a storage medium (not shown) or a memory interface 320 built in for the program selected separately from the viewing. The memory 321 recorded in the receiver 300 can also be connected to the memory interface 120 of the video equipment 100. If the video equipment 100 is taken out of the house and displayed on a display device (not shown) built in the video equipment 100, a program recorded at home can be viewed outside the home.

  Furthermore, by mounting the image pickup device 110 and the microphone 112 on the video equipment 100, it is possible to shoot a still image and a moving image together with sound, and to store them in a storage medium (not shown) or a memory 121 that is incorporated as appropriate. .. The video and audio stored in the built-in storage medium or the memory 121 can be viewed on the video display device 200 via the terminal 101, the connection cable 10 and the terminal 201.

  In the embodiment shown in FIG. 1, the terminal 101 of the video device 100 and the terminal 201 of the video display device 200, and the terminal 301 of the receiver 300 and the terminal 201 of the video display device 200 are connected by wired cables such as connection cables 10 and 11, respectively. It shows about the case. However, when signals are transmitted and received between these video devices, it is not necessary to connect using a cable, and wireless connection may be used. With wireless connection, there is no need for troublesome wiring and wiring arrangement. The use of the connection cable has an advantage that it is more resistant to interference such as noise as compared with the case of wireless connection.

  FIG. 2 shows a first embodiment of the present invention, and shows a specific configuration of the video equipment 100 of FIG. In FIG. 2, the imaging device 110 takes in a moving image or a still image input through an optical system and converts it into an electric signal. In the case of a moving image, the compression circuit 111 uses, for example, MPEG2, MPEG4, AVC/H. A captured image is efficiently bit-compressed by using a compression method such as H.264 or, in the case of a still image, a compression method such as JPEG.

  On the other hand, the microphone 112 converts a sound wave into an electric signal. The compression circuit 113 efficiently bit-compresses the captured audio signal using a compression method such as MPEG audio.

  When a still image is captured by the video equipment 100, the video equipment is rotated according to the object to be captured, and the video equipment is used in a horizontal position or in a vertical position for shooting. The sensor 114 detects whether the video equipment 100 is used for shooting in the horizontal position or for shooting in the vertical position. When used in the vertical position, whether the right side or the left side of the video equipment 100 is up is detected at the same time. The information detected by the sensor 114 is input to the microprocessor 115.

  The multiplexed circuit 116 receives the bit-compressed video signal and audio signal from the compression circuits 111 and 113, and further various information from the microprocessor 115, and multiplexes them according to a predetermined format. When a still image is taken, the audio signal is not normally taken in, but the audio signal may be multiplexed in accordance with the still image shooting.

  Various information from the microprocessor 115 includes position information (horizontal, right vertical, left vertical) using the sensor 114, date, exposure information at the time of shooting, and the like.

  FIG. 3 is a diagram showing an order of signal processing for each block which is generally performed in image compression. As shown in FIG. 3A, signal processing is performed in order from left to right in the upper stage of the image, and then signal processing is performed in sequence from left to right in the second stage. As shown in FIG. 3B, when the right side of the video equipment 100 is set to the vertical position, the signal processing is performed from the bottom of the left column to the top and then from the bottom of the second column from the left. As shown in (c) of FIG. 3, when the left side of the video equipment 100 is set in the vertical position, the signal processing is performed from top to bottom in the right column and then from top to bottom in the second column from the right. ..

  When the vertical position is set at the time of shooting, it is not possible to display the shot video as it was shot when it is displayed on the display device unless there is information on which of the left and right is up. Therefore, as described above, position information as various information from the microprocessor 115 is multiplexed on the video signal and the audio signal. By expanding the compressed signal and performing signal processing of rotating the expanded image using the position information by 90 degrees in accordance with the output of the display device, it is possible to display the photographed image.

  Further, instead of multiplexing the position information, as shown by a dotted line from the microprocessor 115 to the compression circuit 111 in FIG. 2, the position information is given from the microprocessor 115 to the compression circuit 111 to control the compression circuit 111. As a result, the compression circuit 111 performs the compressed signal processing itself in accordance with the image capturing operation or the image capturing position of the image device 100, thereby eliminating the need for rotation processing during reproduction. For example, as shown in (d) and (e) of FIG. 3, based on the position information, the compressed signal processing is performed from the upper left of the image at the time of shooting to the right, and then from the second left to the right. With, it is possible to display the image as it was taken during playback.

  When both the still image and the moving image can be captured by the video device 100, the still image is captured in the horizontal position or the vertical position as described above. Similarly, there are users who consider using the video equipment 100 in a vertical position even when shooting a moving image.

In the case of a moving image, rotation signal processing is not generally prepared, and if it is displayed on the image display device 200 as it is, a horizontally rotated image will be displayed, resulting in unintended shooting for the user. .
Therefore, in the case of capturing an image in the moving image mode, when the user rotates and uses the video equipment 100, the sensor 114 detects the use in the vertical position, and the microprocessor 115 causes the display device 160 to call attention. Is displayed. The display device 160 is used as a monitor of the image captured by the image capturing device 110, so that the user can easily confirm the message while capturing the image, and if not intended, the user can capture the image in the normal horizontal position. Call attention to change.

  At the same time, in the case of use in the vertical position, position information is sent from the microprocessor 115 to the compression circuit 111 to control the compression circuit 111. As a result, for example, the compression circuit 111 can reproduce the compression signal processing according to the image capturing operation of the image and the image capturing position of the image device 100, as shown in (d) and (e) of FIG. Compressed signal processing is performed from left to right in the upper row. As a result, it can be viewed in the vertical position even on the current television. The detailed description will be given later.

  In FIG. 2, the signal multiplexed by the multiplexing circuit 116 is stored in the storage device 130 via the encryption/decryption circuit 140. As the storage device, for example, a hard disk device, an optical disk device, a semiconductor memory device, or the like can be used. What kind of storage device to use depends on the desired storage capacity, size, and ease of taking out the storage medium. It may be decided considering the price. It can also be stored in the memory 121 via the signal processing circuit 124 and the memory interface 120.

  As for the information photographed by an individual, the person who photographed the image has a copyright, and therefore, it is usually unnecessary to encrypt the information when the information is accumulated. However, since the medium stored in the storage device 130 may be lost, by storing the output signal of the multiplexing circuit 116 in the storage device 130 or the memory 121 after encrypting it with the encryption/decryption circuit 140, The safety can be improved.

  The video equipment 100 may support a removable (removable) memory, or may have a mobile phone function or a wireless LAN function. The memory interface 120 is an interface of the removable memory 121, and a still image or a moving image of a video or audio content is recorded in the memory 121 by another device, and by connecting it to the interface 120, the signal processing circuit 124, encryption/encryption. It can be recorded in the storage device 130 via the decoding circuit 140.

  At this time, the signal processing circuit 124 detects whether or not the content recorded in the memory 121 is copyright protected and copy is restricted, and the encryption/decryption circuit 140 encrypts the content according to the condition to store the content. Move to 130.

  Similarly, even when a still image, a moving image, or audio content is received by the wireless interface 122 and input, it is recorded in the storage device 130 via the signal processing circuit 124 and the encryption/decryption circuit 140. Also in this case, the encryption/decryption circuit 140 encrypts the content according to the requirements of copyright protection and copy restriction.

  When reproducing and viewing the content stored in the storage device 130, the content to be viewed is selected using an input key (not shown) or a remote controller, and the selected content is read from the storage device 130 and encrypted. / The encryption/decryption circuit 140 decrypts the encryption, and the demultiplexing circuit 141 separates it into a video signal and an audio signal.

  Further, when the broadcast is received by the broadcast receiver 180, the encryption/decryption circuit 140 decrypts the encryption for the broadcast, and if necessary, the encryption/decryption circuit 140 also performs the encryption process for storage. Then, the data is recorded in the storage device 130 and the memory 121. When the received broadcast is directly viewed, the demultiplexing circuit 141 is separated into a video signal and an audio signal.

  The separated and compressed video signal is expanded by the expansion circuit 142 and input to the signal processing circuit 150. In the signal processing circuit 150, scanning line conversion is performed according to the scanning line of the display device 160, and output to the display device 160.

  The separated and compressed audio signal is expanded by the expansion circuit 143 and output to the audio output device 161. As described above, since the video equipment 100 has the display device 160 and the audio output device 161, it is possible to view the video data as it is without connecting the video display device to the outside. It should be noted that if there is a time difference between the video display and the audio output due to the difference in the time required for the expansion processing of the video signal and the audio signal, the presence or absence of the scanning line conversion processing, etc. In particular, since it takes time to process the video signal and the sense of incongruity increases when the audio signal precedes the video signal, a so-called lip sync adjustment is performed, for example, by delaying the audio signal in the expansion process. As a result, it is possible to eliminate the discomfort caused by the shift between the video signal and the audio signal.

  On the other hand, when the video signal and the audio signal are viewed on the external video display device 200, the scan lines that can be supported by the video display device 200 are confirmed, and if they match the scan line of the video signal to be displayed. If it is output as it is, and if it is different, it is converted into a necessary scanning line in the signal processing circuit 150, and then the multiplexing circuit 170 performs time-axis multiplexing with the audio signal processed by the signal processing circuit 151. The signal processing circuit 151 compresses the audio signal on the time axis in a period corresponding to the blanking period of the video signal, and adjusts the time for lip sync adjustment as necessary. The video signal and the audio signal multiplexed by the multiplexing circuit 170 are input to the encryption circuit 171, and the encryption processing necessary for transmission between the video device 100 and the video display device 200 is performed, and the interface 172 and the terminal 101 are used. Output to the video display device 200.

  As described above, in spite of the moving image, when the video equipment 100 is used in the vertical position and the signal processing is performed by the compressed signal processing as shown in (d) and (e) of FIG. In processing 150, scanning line conversion is performed, and the number of scanning lines that can be captured by the image display device 200 is converted and output. In that case, there are portions where no signal is displayed on the left and right sides of the screen. It is displayed on the display device 160 in a so-called side panel state.

When the signal output from the terminal 101 is stored at the receiver, the compressed signal is output without being expanded. In this case, the compressed signal from the encryption/decryption circuit 140 is input to the encryption circuit 171, and after the encryption required for transmission is performed, it is output via the interface 172 and the terminal 101.
In the above description, the video signal and audio signal fetched from the imaging device 110 and the microphone 112, and the content input from the memory 121 and the wireless interface 122 are recorded once in the storage device 130 and then reproduced. I chose However, when the accumulation is unnecessary or when the content is viewed directly, the demultiplexing circuit 141 may perform the processing without performing the encryption or the decryption processing for the accumulation in the encryption/decryption circuit 140. By doing so, the display device 160 and the audio output device 161 built in the video equipment 100 can be used to view video and audio, or can be viewed on a receiver connected to the outside via the output interface 172. It becomes possible to do.

  FIG. 4 shows a specific configuration of the video display device 200 shown in FIG. The same parts are designated by the same reference numerals, and the details thereof will not be described.

  First, a case where the signal input from the terminal 201 or the terminal 202 is a baseband signal of an uncompressed moving image will be described. The signal input from the terminal 201 or the terminal 202 is input to the encryption/decryption circuit 211 via the input/output interface 210. The encryption/decryption circuit 211 corresponds to the encryption of the encryption circuit 171 shown in FIG. 2, and decrypts the encryption by the encryption circuit 171. The decrypted signal is input to the demultiplexing circuit 250, and the video signal and the audio signal are input to the signal processing circuits 251 and 252, respectively. The signal processing circuit 251 performs scanning line conversion and resolution conversion according to the number of displayable pixels on the display 260. The signal processing circuit 252 expands the time axis of the audio signal that is time axis compressed and multiplexed with the blanking of the video signal, and further performs lip sync adjustment, sound quality adjustment, and the like as necessary. The output signals of the signal processing circuits 251 and 252 are input to the display 260 and the audio output device 270, respectively, and viewed.

  Next, a case where a compressed moving image signal is input from the terminal 201 or the terminal 202 will be described. The purpose of inputting the compressed signal is to store the moving image signal in the storage device 230 built in the video display device side 200.

  The signal input from the terminal 201 or the terminal 202 is input to the encryption/decryption circuit 211 via the input/output interface 210. The encryption/decryption circuit 211 corresponds to the encryption of the encryption circuit 171 shown in FIG. 2, and decrypts the encrypted one by the encryption circuit 171. The encrypted/decrypted signal is input to the encryption/decryption circuit 240. The encryption/decryption circuit 240 reads the copy control information of the content to be stored, and performs the encryption process for storage according to the read control information. The encrypted signal is input to the storage device 230 and stored while being compressed.

  When viewing while accumulating the compressed signal input from the terminal 201 or the terminal 202, first, the signal corresponding to the compressed signal decrypted by the encryption/decryption circuit 211 is demultiplexed from the encryption/decryption circuit 240. It is input to the circuit 241. Then, the demultiplexing circuit 241 separates the compressed video signal and audio signal. The separated video and audio signals are decompressed by decompression circuits 242 and 243, respectively, returned to the baseband, and then input to signal processing circuits 251 and 252, respectively. Similarly, the same is input to the display 260 and the audio output device 270 for viewing.

  When reproducing and viewing the content stored in the storage device 230, the title of the content stored in the storage device 230 is displayed on the display 260, and the signal of the selected content is selected and stored. To the encryption/decryption circuit 240. The encryption/encryption/decryption circuit 240 decrypts the encryption of the signal of the selected content, inputs it to the demultiplexing circuit 241, and thereafter performs the same processing, so that it can be viewed.

  Similarly, the content stored in the memory 221 can be reproduced. Similar to the reproduction of the content stored in the storage device 230, the content desired to be viewed is selected from the content stored in the memory 221, and the selected content is encrypted/decrypted by the memory interface 220 and the signal processing circuit 224. To enter. The signal processing circuit 224 performs processing necessary for reading the content from the memory 221, inputs the compressed and multiplexed video signal and audio signal to the encryption/decryption circuit 240. The subsequent signal processing is the same as when the content is read from the storage device 230.

  Further, the content can be stored in the memory 221 in the same manner as the storage is stored in the storage device 230. Although detailed description of the processing in that case is omitted, the content encrypted by the encryption/decryption circuit 240 is accumulated in the memory 221 via the signal processing circuit 224 and the memory interface 220.

  The same process is performed when viewing or accumulating content transmitted wirelessly. The compressed content sent by radio is input to the encryption/decryption circuit 240 via the wireless interface 222 and the signal processing circuit 224. The encryption/decryption circuit 240 decrypts the encryption of the encryption processing required for wireless transmission. The subsequent process is the same as the process at the time of reproduction from the storage device 230.

  Even when an uncompressed baseband signal is input from the terminal 201 or the terminal 202, the content can be efficiently stored in the storage device 230 and the memory 221. The operation in that case will be described below.

  The content input from the terminal 201 or the terminal 202 is separated into a video signal and an audio signal via the input/output interface 210, the encryption/decryption circuit 211, and the demultiplexing circuit 250. The separated video signal and audio signal are input to the compression circuits 281 and 282 via the copy control circuit 280. The duplication control circuit 280 reads the duplication control information multiplexed with the input content, and determines whether or not duplication is possible. The copy control information can be multiplexed with the video information or the audio information itself by assigning a bit to a designated portion or by using a digital watermark technique.

  The compression circuit 281 converts the video signal into, for example, MPEG2, MPEG4, AVC/H. A compression method such as H.264 is used for compression. The compression circuit 282 compresses the audio signal using a compression method such as MPEG audio. The compressed video signal and audio signal are input to the multiplexing circuit 283, multiplexed and then input to the encryption/decryption circuit, and can be stored in the storage device 230 and the memory 221 in the same manner. Thereby, the content can be efficiently recorded for a long time according to the copyright information.

  So far, the present embodiment has been described mainly regarding the case of transmitting the video signal and the audio signal output from the video equipment 100 to the video display device 200. Further, the present embodiment will be described with reference to FIG. 6 regarding the case where two video devices 100 are connected to each other. In FIG. 6, the video equipment 1 and the video equipment 2 are both configured by a portable video equipment 100 such as a mobile phone or a digital camera, and a connection cable which is a bidirectional interface is provided between respective terminals 101. Connected by 10. With this configuration, the content such as a movie from the base station antenna 20 of the mobile phone received by the video equipment 1 is transmitted to the video equipment 2 via the connection cable 10, and the contents of the video equipment 2 are transmitted. It is possible to display using the display device 160 of No. 1 and to output audio using the audio output device 161 in the video equipment 2. When transmitting the content stored in the storage device 130 in the video device 1, the desired content is read from the storage device 130 based on the content of the control signal from the video device 2, and encrypted/decrypted. The circuit 140 decrypts the cipher. Then, the cryptographic circuit 171 performs cryptographic processing required for external transmission, and then outputs it via the interface 172 and the terminal 101. At this time, the control signal from the video equipment 2 includes mutual authentication for confirming that the video equipment 1 and the video equipment 2 are legitimate equipment, a synchronization control signal for synchronizing signal processing, A transmission request signal, an identification signal indicating that it is the video device 1, and the like are used. The control signal is transmitted from the video equipment 1 to the video equipment 2 as necessary.

  The signals transmitted/received between the video equipment 1 and the video equipment 2 are not limited to those received from the base station antenna 20 of the mobile phone as described above, but also those received by the broadcast receiver 180 and stored. It may be stored content on the device 130 or content on the memory 121.

  The video equipment 1 and the video equipment 2 are, for example, the same video equipment 100. Then, these video devices are connected to each other by the bidirectional interface as described above. Information such as video and audio may be sent from the video device 1 to the video device 2, but it is also possible to send information such as video and audio from the video device 2 to the video device 1. Here, the direction in which information is transmitted from the video device 1 to the video device 2 is referred to as “upstream”, and conversely, the direction in which information is transmitted from the video device 2 to the video device 1 is defined as “downstream”. .. Of course, the opposite directions may be referred to as "up" and "down", respectively. The bidirectional interface that connects the video equipment 1 and the video equipment 2 to each other has an asymmetrical transmission rate between upstream and downstream, that is, the transmission rate is different from each other. Then, when transmitting information such as broadband video and audio from the video device 1 to the video device 2 in the up direction, narrow band control from the video device 2 to the video device 1 (compared with video and audio). A signal is sent. On the contrary, when transmitting information such as wideband video and audio from the video device 2 to the video device 1 in the down direction, a narrowband control signal is sent from the video device 1 to the video device 2. Therefore, of the up and down directions, the transmission rate in the direction of transmitting wideband video and audio is increased, while the transmission rate in the direction of transmitting the narrowband control signal is decreased. As described above, in the present embodiment, information and signals of different bands are transmitted between the plurality of different video devices in the up and down directions, so that a video signal requiring a wide band for transmission and a narrow band. However, the good control signal can be used in a limited frequency band at the same time, and the use efficiency of radio waves can be improved. The control signal is not transmitted from only one device, but is also transmitted from the device on the other side as necessary.

  FIG. 7 is a configuration diagram when the video display device 200 and the video device 100 are wirelessly connected in the first embodiment. 7, only the input/output interface 210 and the interface 172 are not shown for simplification of description. As described above, the bidirectional interface for connecting the video devices is not limited to the wired cable, and the bidirectional interface may be wirelessly configured. In this case, the degree of freedom of arrangement of each device is increased.

FIG. 8 is an explanatory diagram when the video device 100 and the video display device 200 are wirelessly connected. In FIG. 8, the video equipment 100 and the video display device 200 are the same as those described in FIGS. 1 and 2, respectively. For simplification of description, in FIG. 8, only the interface circuit 172 is described as the constituent requirements of the video equipment 100, and the other constituent requirements are not shown. Further, regarding the video display device 200, only the input/output interface 210 is described, and other constituent elements are not shown. Here, the interface circuit 172 and the input/output interface 210 are both bidirectional interfaces, and the transmission rates are asymmetrical between the upstream and the downstream as in the above example. In FIG. 8, a space between the antennas 81 and 84 and a space between the antennas 82 and 85 are channels for bidirectionally transmitting a video signal, an audio signal, and a control signal indicating a copyright protection condition and a copy restriction condition of the content. On the other hand, the channel between the antennas 83 and 86 is for transmitting an inter-device control signal.
In addition, the bit selection circuits 811, 812 are input with a video signal, an audio signal, a control signal indicating copyright protection and copy restriction conditions of content, and an inter-device control signal. Regarding the modulation/demodulation method described above, the QPSK modulation/demodulation method has higher tolerance to transmission errors than the 64QAM modulation/demodulation method. On the other hand, regarding the transmission efficiency, the 64QAM modulation/demodulation method is higher in efficiency than the QPSK modulation/demodulation method. Here, a case will be described in which the video device 100 sends a control signal indicating video and audio and content related copyright protection and copy restriction conditions to the video display device 200. Here, the direction in which information is transmitted from the video device 100 to the video display device 200 is an upward direction, and conversely, the direction in which information is transmitted from the video display device 200 to the video device 100 is a downward direction.

  In order for the video equipment 100 to transmit information, first, a carrier wave detection circuit (not shown) investigates whether the used channel is already occupied by another equipment. This carrier wave detection is performed by detecting whether a carrier wave exists in a predetermined frequency band for a predetermined period. When the carrier wave detection circuit detects that another device is using the channel, it waits for a while and then checks the idle state of the channel again. After that, when it is detected that the channel is not used by another device, the microprocessor 115 of the video device 100 is notified that the channel is vacant. The microprocessor 115 outputs a channel use request signal as an inter-device control signal from the QPSK modulation/demodulation circuit 803 to secure the channel use right. Next, the microprocessor 115 outputs a transmission request signal to the bit selection circuit 811. The error control circuit 843 adds an error control bit for error detection/correction to this transmission request signal and sends it to the QPSK modulation/demodulation circuit 803. The QPSK modulation/demodulation circuit 803 performs QPSK modulation and transmits a wireless signal to the video display device 200 via the antenna 83. On the other hand, the video display device 200 demodulates the wireless signal received by the antenna 86 by the QPSK modulation/demodulation circuit 806 and outputs the inter-device control signal by performing error detection/correction control by the error control circuit 847, and performs bit selection. Tell circuit 812.

  The microprocessor in the video display device 200 decodes the received inter-device control signal, and together with the transmission request signal from the video device 100, device category information regarding the video device 100 (category such as display device or recording device). Information for identifying) and the device identification number of the video device 100. Since the display screen of the video display device 200 displays whether or not to connect to the video device 100, the user uses an input device such as a remote controller of the video display device 200 based on this display. And give an instruction to allow the connection. After that, the device category information and the identification number for identifying the device are exchanged between the video device 100 and the video display device 200, and the copyright protection of content and the copy restriction condition are observed. Information exchange for each other, and if there is no problem, mutual connection is permitted. If there is no point in connecting to each other, such as when the devices are input-only devices or output-only devices, or when the content copyright protection and copy restriction conditions are violated, the connection processing is performed. The process is stopped, and a message to that effect is displayed on each device. The following describes the case where there is no problem with the content copyright protection and copy restriction conditions.

  Of the control signals, which are input to the interface circuit 172 and indicate the video signal, the audio signal, and the copyright protection and copy restriction conditions for the contents related thereto, select 2 bits from the MSB of the video signal, and select the 2 bits. On the other hand, the error control circuit 841 adds a control bit for error detection/correction and sends it to the QPSK modulation/demodulation circuit 801. Then, the QPSK modulation/demodulation circuit 801 QPSK-modulates this signal, and transmits a radio signal from the antenna 81. The error control circuit 842 adds control bits for error detection/correction to the remaining 3rd to 8th bits and sends them to the 64QAM modulation/demodulation circuit 802. Then, the 64QAM modulation/demodulation circuit 802 subjects this signal to 64QAM modulation, and transmits a radio signal from the antenna 82.

  In the video display device 200, the QPSK modulation/demodulation circuit 804 demodulates the signal received by the antenna 84 and performs error control by the error control circuit 845, and then the upper 2 bits of the video signal are sent to the bit control circuit 812. Output. The 64QAM modulation/demodulation circuit 805 performs 64QAM demodulation on the remaining signal received by the antenna 85, performs error control by the error control circuit 846, and outputs the signal to the bit control circuit 812.

  Here, the inter-device control signal will be described. The inter-device control signal is modulated in the downstream direction, that is, when the signal is sent from the video display device 200 to the video device 100, is modulated from the bit selection circuit 812 via the error control circuit 847 by the QPSK modulation/demodulation circuit 806 and then the antenna 86. Output from. The video equipment 100 receives this signal by the antenna 83, performs QPSK demodulation by the QPSK modulation/demodulation circuit 803 via the QPSK modulation/demodulation circuit 83, performs error detection/correction by the error control circuit 843, and then performs the bit selection circuit 811. Transmit to. On the contrary, when the inter-device control signal is transmitted in the upstream direction, that is, when the signal is sent from the video device 100 to the video display device 200, it is modulated by the QPSK modulation/demodulation circuit 803 from the bit selection circuit 811 through the error control circuit 843. Output from the antenna 83. The image display device 200 receives this signal at the antenna 86, QPSK demodulates it by the QPSK modulation/demodulation circuit 806, and performs error detection/correction by the error control circuit 847, and then transmits it to the bit selection circuit 812. By doing so, it is possible to reduce the malfunction of the inter-device control signal, which is important in constructing the system, even in a noisy environment.

  With the configuration of the present embodiment, it is possible to perform transmission with high noise resistance, although the transmission rate is low for the upper 2 bits of the digital signal. That is, taking advantage of the fact that the upper bits of the video signal have a greater effect on the image quality, two bits are sequentially extracted from the MSB of the video signal, and a transmission path using QPSK modulation is assigned to these pieces of information to obtain the image quality. To reduce the deterioration of. By the way, in a system in which audio information is more important than video, it is possible to allocate important (for example, upper) 2 bits of an audio signal to a transmission path using QPSK modulation.

  Further, when a person recognizes an image, with respect to each of the frequency component in the horizontal direction of the screen and the frequency component in the vertical direction of the screen, there is a tendency that the high frequency component is relatively unnoticeable to the low frequency component. In addition, among the moving objects on the screen, there is a tendency that the human eye does not follow the fast movement. By utilizing these tendencies, the horizontal direction of the screen may be divided into a low frequency component and a high frequency component, and QPSK modulation may be used for the low frequency component and 64QAM modulation may be used for the high frequency component. By doing so, it is possible to improve noise resistance to important information and secure the entire transmission capacity within a limited transmission band. Similarly, the vertical direction of the screen may be divided into low frequency components and high frequency components, and QPSK modulation may be used for the low frequency components and 64QAM modulation may be used for the high frequency components. By doing so, it is possible to improve noise resistance to important information and secure the entire transmission capacity within a limited transmission band. Furthermore, the handling of frequency components in the horizontal direction of the screen and the handling of frequency components in the vertical direction can be combined to enhance noise resistance with respect to desired important information.

  In the above description, the error control circuits 841, 842, 843 have been described as adding the error control information to each bit input to the error control circuits 841, 842, 843, but the error control circuits 841, 842 are described. , 843, the bits input may be collectively treated as one word, and error control information may be added to this one word. With this configuration, the error control circuit is simple and easy to configure.

  With the configuration shown in FIG. 8, for example, a plurality of still images captured by the video equipment 1 are switched to the video display device 200 or the video equipment 2 at predetermined intervals, for example, every 1 second, and transmitted. A plurality of still images can be displayed on the video display device 200 or the video device 2. From the video display device 200 or the video device 2, a video request signal for sending an image is sent to the video device 1, and the video device 1 switches a plurality of still images based on the video request signal to switch the still image. Is transmitted to the video display device 200 or the video equipment 2. With such a configuration, when the image cannot be reproduced on the image display device 200 or the image device 2, the image request signal is sent again to the image device 1 so that the image can be repeated until the image is correctly received. .. In this case as well, the video request signal uses QPSK modulation, and therefore has excellent noise resistance.

  An embodiment for acquiring an image from the video equipment 1 using the video request signal and displaying the image on the display device will be described with reference to FIG. In the present embodiment, a case where a plurality of still images captured by the video equipment 1 are switched and displayed on the video display device 200 will be described as an example, but the same can be performed when displaying on the video equipment 2. Is.

  FIG. 10 shows an embodiment of a display device configured to display a still image from the video equipment 1. In this embodiment, a television display provided with a high-definition HD display 1002 as a display device. The device is used. In FIG. 10, the video device 1020 is specifically a digital camera, a mobile phone, a game machine, a personal media player, or the like. In this embodiment, a still image is transmitted from the video device 1020 to the video display device 200 (television display device) via two interfaces. One is HDMI for transmitting a still image as baseband video information, and the other is a USB for transmitting a still image as compressed video information. Here, it is assumed that the compressed video information transmitted by USB is compressed in the JPEG format.

  First, the configuration and operation of the video equipment 1020 side will be described. When transmitting the still image of the compressed video information, the video device 1020 reads the still image compressed in the JPEG format from the memory 1018 formed of, for example, a flash memory. This is supplied from the USB mass storage interface circuit 1019 to the USB terminal 1012, which is the first input unit of the video display device 200, without performing signal processing such as expansion processing.

  On the other hand, when transmitting a still image of baseband video information, the video equipment 1020 first reads the still image from the memory 1018. Since this still image is compressed in the JPEG format, the signal processing circuit 1016 performs signal processing for expanding the compressed image to generate baseband video information. This baseband video information is transmitted from the HDMI interface circuit 1017 to the HDMI terminal 1005 which is the second input unit of the video display device 200.

  Next, the configuration and operation of the video display device 200 side will be described. The still image of the compressed video information input to the USB terminal 1012, which is the first input unit, is supplied to the image processing circuit 1006 via the USB host interface circuit 1011. The image processing circuit 1006 includes a JPEG data file access circuit 1010, a JPEG decoding circuit 1009, a resizing/effect adding circuit 1008, and an image stream signal converting circuit 1007. The still image input to the USB terminal 1012 is supplied to the JPEG decoding circuit 1009 via the JPEG data file access circuit 1010, and the still image compressed in the JPEG format is decoded, that is, expanded, in the circuit. .. The display size (the number of pixels in the horizontal and vertical directions) of the still image subjected to the decompression processing is changed by the resize/effect adding circuit 1008, and a desired effect processing (for example, rotation processing) is performed. It The still image that has been subjected to size change processing or the like in the resizing/effect adding circuit 1008 is converted into an image signal for display by the image stream signal converting circuit 1007, and is supplied to the HD display 1002 via the switching circuit 1003. As a result, the display of the compressed still image input via the USB host interface circuit 1011 is displayed on the screen of the HD display 1002.

  In this embodiment, a LAN terminal 1014 that can be connected to various networks 1015 such as a wireless LAN, a wired LAN, and the Internet is provided as a first input unit to which compressed video information is input. Therefore, in the present embodiment, it is possible to acquire the compressed video through the network 1015 as well as the USB interface. The compressed video information input to the LAN terminal 1014 is input to the image processing circuit 1006 via a LAN/DLNA (Digital Living Network Alliance) interface circuit. Since the processing in the image processing circuit 1006 is the same as the processing for the compressed video information input via the USB terminal 1012 described above, the duplicated description will be omitted here.

  On the other hand, the still image of the baseband video information input to the HDMI terminal 1005, which is the second input unit, is subjected to predetermined decoding processing (decryption processing) by the HDMI interface/decoding circuit 1004. The still image subjected to the descrambling process is supplied to the HD display 1002 via the switching circuit 1003, and the still image is displayed on the screen of the HD display 1002.

  The switching circuit 1003 selects either the still image input to the HDMI terminal 1005 or the still image input to the USB terminal or the LAN terminal 1014 and supplies it to the HD display 1002. It is controlled by the user's operation on the remote controller for the display device 200. Therefore, the user can select either compressed video information or baseband video information according to his/her preference and display it on the HD display 1002.

  In the above embodiment, the HDMI and USB interfaces are used as the interfaces for connecting to the video equipment 1020, but naturally, interfaces of other standards may be used.

  Here, before describing the operation of the present embodiment based on the video request signal, the HDMI interface will be supplementarily described. FIG. 16 shows an example of the configuration of the HDMI interface, which is mainly composed of a transmitting side and a receiving side. The transmission side includes a transmission section 1601 and a transmission side control section 1603 that controls the transmission section 1601. The transmission section 1601 encodes video signals (Y, Pb, Pr) and audio signals and outputs them to the reception section 1604. Is configured. Further, the transmission unit 1601 includes a TMDS encoding circuit 1602, and converts the video signal (Y, Pb, Pr) and the audio signal into serial video data and serial audio data, respectively. On the other hand, the reception side includes a reception section 1604 and a transmission side control section 1606 that controls the reception section 1604. The reception section 1604 uses TMDS decoding 1605 to TMDS the video data and audio data transmitted from the transmission section 1601. Decode and reproduce baseband video and audio data. The CEC line 1607 constitutes a device control line for transmitting a control signal for the device, and display specification information called DDC is transmitted via the DDC line 1608. Further, the receiving side transmits an HPD (Hot Plug Detect) signal 1609 indicating that the transmitting side device and the receiving side device are connected to the transmitting side.

  FIG. 17 shows an example of the format of the remote control code transmitted by the CEC line 1607. As shown in FIG. 17, the remote control code has a length of 48 bits and includes a 16-bit maker code for identifying the maker and a 12-bit device code for identifying the device such as the model number and manufacturing number of the device. . The format of the remote control code may be other than that shown in FIG. Further, the remote control code length is not limited to the 48-bit length and may be another bit length. Next, an example of a method of transmitting the remote control code by the CEC line will be described with reference to FIG. First, when the video device and the display device are connected, the display device sends an HPD signal 1609 indicating that the two devices are connected to the video device. Then, the display device 200 next reads the manufacturer code and the device code of the video device through the CEC line 1607 of the HDMI cable. Then, the read manufacturer code and device code are stored in the display device 200 together with the reception interface number. The manufacturer code and the device code may be stored in the memory of the microcomputer (not shown) of the display device 200. If another HDMI cable is connected, the same process is performed for that HDMI cable, and the corresponding manufacturer code and device code are recorded on the display device together with the reception interface number. The manufacturer code and device code thus read are stored as a table shown in FIG. With this configuration, for example, even when the display device 200 and the video equipment 1020 connected to each other have different manufacturers, communication between the display apparatus 200 and the video equipment 1020 can be performed by referring to the stored manufacturer code and equipment code. The display device 200 can be established, the display device 200 can be controlled from the video device 1020 side, and the display specification information (DDC) can be transmitted from the display device 200 to the video device 1020.

  Returning to FIG. 10 again, the operation of this embodiment based on the video request signal will be described. In FIG. 10, the user operates an input device such as a remote controller or a keyboard of the video display device 200 to control the input device to enter the display mode for switching and displaying the still image as described above. Is output. According to this control command, the JPEG data file access circuit 1010 of the video display device 200 outputs a still image which is compressed video information to the external video device 1020 via the USB host interface circuit 1011 and the USB terminal 1012. To transmit the video request signal. That is, in this example, the JPEG data file access circuit 1010 has a function as a transmission unit for transmitting the video request signal to the external video device 1020. The video request signal is transmitted from the video display device 200 to the video device 1020 at a predetermined cycle (for example, every one second). Upon receiving this video request signal, the video equipment 1020 outputs the still image data recorded in the memory 1018 via the USB mass storage interface circuit 1019. The USB host interface circuit 1011 takes in the still image data via the USB terminal 1012. Then, the JPEG decoding circuit 1009 JPEG-decodes the read JPEG data and restores the original image data. Then, the resizing/effect adding circuit 1008 performs resizing and effect processing, the image stream signal converting circuit 1007 converts the image signal for display, and displays the image signal on the HD display 1002.

  The process from the transmission of the video request signal to the conversion process of the image signal for display by the image stream signal conversion circuit 1007 described above is repeated every predetermined period (for example, 1 second) to obtain from the video device 1020 called a slide show. It is possible to perform an image display method in which the plurality of still images are switched and displayed at predetermined intervals. Of course, this time interval can be set to another time instead of one second, and this interval can be appropriately changed by the user by the input device described above. Further, the video request signal may be repeatedly output until all the still images are read from the video equipment 1020, but a predetermined period (for example, 10 seconds to 1 minute) is set and a predetermined period is set within the predetermined period. The video request signal may be transmitted in a cycle.

  It is also possible to send the above-mentioned video request signal from a microcomputer (not shown) of the video display device 200 to the video device 1020 via the HDMI interface/decode circuit 1004 and the HDMI terminal 1005. In this case, since the HDMI interface is an interface for transmitting a moving image as a transmission format, a moving image that does not change with time is sent unless there is specific control.

  First, a user operates an input device such as a remote controller or a keyboard of the video display device 200 to cause the input device to output a control command to enter the display mode. According to this control command, the HDMI interface/decode circuit 1004 transmits a video request signal to the video equipment 1020 via the CEC line in the HDMI terminal 1005. That is, in this example, the HDMI interface/decode circuit 1004 has a function as a transmission unit for transmitting the video request signal to the external video device 1020. This video request signal is transmitted from the video display device 200 to the video device 1020 from the video display device 200 at predetermined intervals (for example, every 1 second), for example, for several seconds to 1 minute, as in the above example. In response to this, the video equipment 1020 converts the still image data recorded in the memory 1018 into a signal format that can be displayed as a moving image by the signal processing circuit 1016, and outputs the signal format via the HDMI interface circuit 1017. The video display device 200 receives this data via the HDMI terminal 1005 and the HDMI interface circuit/decode circuit 1004 and displays it on the HD display. By repeating this processing every predetermined time, it is possible to display an image called a slide show as well. Of course, this time interval may be appropriately changeable by the user as in the above case. Further, the video request signal may be repeatedly output until all the still images are read from the video device 1020, or as described above, the video request signal may be transmitted at a predetermined cycle within a predetermined period. May be.

  Further, although the description so far has been made on the method of displaying the image information from the video equipment 1020 on the video display device 200, even when the image information is present on the network 1015, the slide show display is performed in the same manner. It is possible to do. In this case, the JPEG data file access circuit 1010 of the video display device 200 receives the control command from the input device and transmits it to the network 1015 via the LAN/DLNA interface circuit 1013 and the LAN terminal 1014. In this case, the network address (for example, IP address) of the video device connected to the network is added to the video request signal. The video signal corresponding to the address added to the video request signal receives the video request signal and transmits still image data as compressed video information. The still image data is input via the LAN terminal 1014 and the LAN/DLNA interface circuit 1013 and supplied to the JPEG decoding circuit 1009. Subsequent processing is the same as the processing for the still image input to the USB terminal 1012 described above, and therefore, redundant description will be omitted here.

  In order to realize this network function, the LAN terminal 1014 and the LAN/DLNA interface circuit 1013 are provided in this embodiment, but it is also possible to extend the HDMI interface or the USB interface so as to have the same function. ..

  FIG. 11 shows the configuration of another embodiment according to the present invention. 11, the same components as those in FIG. 10 are given the same numbers as in FIG. 11 is different from the configuration of FIG. 11 in that the signal path from the USB terminal 1012 and the signal path from the LAN terminal 1014 are deleted from the display device 200 in FIG. Further, in the configuration of the video device 1020, instead of the USB mass storage interface circuit 1019, a PTP (protocol for connecting a digital camera and a PC or the like by USB to transfer and control an image) control circuit 1101, a LAN interface The difference is that a circuit 1102 is newly provided. Regarding the operation, in FIG. 10 and FIG. 11, the path of the HDMI terminal works similarly, and a slide show can be performed. When the configuration of FIG. 11 is used, the configuration of the display device 200 is simplified, and complicated connection is not required, which has the effect of improving the convenience for the user. That is, the present embodiment can be applied to a configuration in which only the first input unit is provided, that is, a configuration for displaying a still image of the baseband video information. Further, in this example, the HDMI interface is one system, but two or more systems may be provided.

  Here, another display mode of the plurality of still images captured by the video equipment 1 on the video display device 200 will be described with reference to FIG. 10. In this display form, a plurality of still images are reduced and simultaneously displayed on one screen of the HD display 1002.

  In FIG. 10, the JPEG data file access circuit 1010 of the video display device 200 sends a still image video acquisition request to the video device 1020 via the USB host interface circuit 1011 and the USB terminal 1012. In response to this, the video equipment 1020 outputs the still image data, which is the compressed video information recorded in the memory 1018, via the USB mass storage interface circuit 1019. The USB host interface circuit 1011 reads this still image data via the USB terminal 1012. Then, the JPEG decoding circuit 1009 JPEG-decodes the read JPEG data and restores the original image data. Then, the resizing/effect adding circuit 1008 performs resizing and effect processing, and temporarily stores it as an image of a portion corresponding to the display position 1 in FIG. Similarly, the JPEG data file access circuit 1010 sends a video acquisition request for the next still image to the video device 1020 via the USB host interface circuit 1011 and the USB terminal 1012. In response to this, the video equipment 1020 outputs the still image data, which is the next compressed video information recorded in the memory 1018, via the USB mass storage interface circuit 1019. The USB host interface circuit 1011 reads this still image data via the USB terminal 1012. Then, the JPEG decoding circuit 1009 JPEG-decodes the read JPEG data and restores the original image data. Then, the resizing/effect adding circuit 1008 performs resizing and effect processing, and temporarily saves it as an image of a portion corresponding to the display position 2 in FIG. By repeating such processing from the image acquisition request to the temporary storage of images 12 times, for example, as shown in FIG. 12, it is possible to collectively display a plurality of still images, which is called thumbnail display. This process is performed, for example, by transmitting 12 video acquisition requests to the video device 1020 during a predetermined time (for example, less than 1 second).

  When the video device 1020 has 12 or more still images, thumbnail display is performed for each 12 images. With such a display method, since a plurality of images can be viewed at the same time, there is an effect that it is easy to distinguish a color difference or a subtle scene difference and the convenience is good.

  Here, in order to explain the operation in an easy-to-understand manner, one video device 1020 was connected, but it is also possible to connect two video devices 1020. It is also possible to view them side by side. By doing so, it is possible to confirm the difference in color and the difference in brightness due to the difference between the two video devices 1020 and the difference in the shooting conditions. Therefore, the required image can be easily selected from the images of the two video devices. There is an effect that you can.

  This display function can also be realized by using the configuration of FIG. Regarding the operation, there is the same effect in FIG. 10 and FIG. 11, and it is possible to collectively display a plurality of still images captured by the video equipment 1. When the configuration of FIG. 11 is used, the configuration of the display device 200 is simplified, and complicated connection is not required, which has the effect of improving the convenience for the user. In this case, a memory for combining a plurality of small images is required, but a plurality of small screens may be combined in advance on the memory 1018 on the video equipment 1020 and then sent to the video display device 200. A memory (not shown) may be formed after the HDMI interface circuit and the decoding circuit 1004, and this memory may form a small screen. Both configurations have the same effect as in FIG.

  In the above description, the number of still images to be displayed at the same time is 12, but as shown in FIG. 13, it is also possible to display as two vertical rows and two horizontal columns. Further, as shown in FIG. 14, it is also possible to display them in two vertical rows and two horizontal columns. When the number of divisions as shown in FIGS. 13 and 14 is used, the resolution of the HD display 1002 is 1080×1920, and the resolution of one small screen is about 300×500. Become. Further, when the small screen itself becomes small, screen flicker or the like occurs. However, by using the divisions of FIGS. 13 and 14, this flicker can be reduced. On the other hand, using the division of FIG. 12, when an image from a digital camera is input, the aspect ratio of the image is approximately 4:3, so that the images are efficiently arranged and displayed on the HD display 1002 having an aspect ratio of 16:9. There is an effect that can be done. Further, even if the images are displayed side by side as shown in FIGS. 13 and 14, almost the same effect can be obtained, although some areas are not displayed.

  By the way, attribute information such as image rotation information and erroneous erasure prevention lock information for erroneous erasure prevention is added to each image stored in the memory 1018 of the video equipment 1020. In this embodiment, the attribute information is sent from the video display device 200 to the video device 1020 via the HDMI terminal 1005 and stored in the memory 1018 by an operation from the remote controller or the keyboard of the video display device 200. I am trying. FIG. 15 shows an example of a management table of attribute information recorded on the memory 1018. As shown in FIG. 15, with respect to each of the plurality of still images stored in the memory 1018 of the video device 1020, attribute information relating to whether or not the erase lock is possible and the rotation angle are added and stored by a signal from the video display device 200. Can be made With this configuration, since the device directly controlled by the user is the video display device 200, even if any video device 1020 is connected, erroneous erasure prevention lock control and video display can be performed by the same operation. Control such as rotation can be performed, there is no need to remember complicated operations for each video device 1020, and convenience is improved.

  Although details of the cryptographic processing are not described in the embodiment shown in FIG. 8, the cryptographic circuit 171 and the interface circuit 172 may be combined to perform the processing as shown in FIG. FIG. 9 shows an example of a configuration for performing cryptographic processing in the system shown in FIG. 8. The system of FIG. 9 has encryption/decryption circuits 821 to 826 and interface circuits 830 and 831 including cryptographic processing. , Error control circuits 841, 842, 843, 845, 846, 847.

  In the example shown in FIG. 9, as in the example of FIG. 8, a predetermined bit is selected by the bit selection circuit 811, each bit is subjected to error control by the error control circuits 841 and 842, and then the encryption/decryption circuit 821 is selected. , 822, and is input to the QPSK modulation/demodulation circuit 801 and the 64QAM modulation/demodulation circuit 802. Further, the signals demodulated by the QPSK modulation/demodulation circuit 804 and the 64QAM modulation/demodulation circuit 805 are input to the encryption/decryption circuits 824 and 825, respectively, and after being encrypted/decrypted, the bits are combined by the bit selection circuit 812. By performing the processing in this manner, signal processing according to the degree of importance can be performed, important information is less likely to cause an error, and therefore deterioration in image quality can be reduced and efficient transmission can be performed.

  Further, by combining the encryption/decryption circuits 821 to 826 with a reversible code, more efficient transmission becomes possible. For example, in the example shown in FIG. 9, before performing encryption processing in the encryption/decryption circuits 821 to 823, encryption is performed after reducing bits to be transmitted by a reversible arithmetic code using statistical properties, for example. .. In the video device display device 200, after encryption/decryption by the encryption/decryption circuits 824 to 826, decryption of a reversible code corresponding to the encryption/decryption circuits 821 to 823, error detection by the error control circuits 845 to 847 is performed. -Correction is performed and the bit selection circuit 812 synthesizes bits. By combining reversible codes, the transmission rate of information to be transmitted can be reduced, so that the transmission can be performed more efficiently.

  Furthermore, a supplementary explanation will be given regarding encryption. If all the encryption circuits are processed using the AES 128-bit encryption process, it is possible to perform a protection process with a high degree of security. In addition, if the AES128-bit encryption process is used for the content encryption circuit 821 and the DES encryption process is used for the other encryption circuits, the balance between the content protection important for the system and the processing efficiency is achieved. It becomes easy to configure the system.

  Further, the baseband signal transmission and the compressed signal transmission may be switched according to the inter-device control signal. With such a configuration, when a compressed signal is transmitted in response to a request for content protection or the like, transmission using QPSK modulation enables transmission with excellent error resistance on the transmission path. In addition, when transmitting a baseband signal, 64QAM modulation enables transmission with good transmission efficiency.

  The operations of the video equipment 100 and the video display apparatus 200 in FIG. 9 are basically the same as the operations of the video equipment 100 and the video display apparatus 200 in FIG. In order for the video equipment 100 to perform transmission, first, a carrier wave detection circuit (not shown) investigates whether or not the used channel is already occupied by another equipment. This carrier wave detection is performed by detecting whether a carrier wave exists in a predetermined frequency band for a predetermined period. When the carrier wave detection circuit detects that another device is using the channel, it waits for a while and then checks the idle state of the channel again. After that, when it is detected that the channel is not used by another device, the microprocessor 115 of the video device 100 is notified that the channel is vacant. The microprocessor 115 outputs a channel use request signal as an inter-device control signal from the QPSK modulation/demodulation circuit 803 to secure the channel use right. Next, the microprocessor 115 outputs a transmission request signal to the bit selection circuit 811.

  The error control circuit 843 adds an error control bit for error detection/correction to this transmission request signal, encrypts it by the encryption/decryption circuit 823, and sends it to the QPSK modulation/demodulation circuit 803. The QPSK modulation/demodulation circuit 803 performs QPSK modulation and transmits a wireless signal to the video display device 200 via the antenna 83. On the other hand, in the video display device 200, the wireless signal received by the antenna 86 is QPSK demodulated by the QPSK modulation/demodulation circuit 806, and the encryption/decryption circuit 826 decrypts it. The error control circuit 847 performs error detection/correction control on the decoded signal to output an inter-device control signal, which is transmitted to the bit selection circuit 812. The microprocessor in the video display device 200 decodes the received inter-device control signal, and together with the transmission request signal from the video device 100, device category information regarding the video device 100 (category such as display device or recording device). Information for identifying) and the device identification number of the video device 100. Since the display screen of the video display device 200 displays whether or not to connect to the video device 100, the user uses an input device such as a remote controller of the video display device 200 based on this display. And give an instruction to allow the connection. After that, the device category information and the identification number for identifying the device are exchanged between the video device 100 and the video display device 200, and the copyright protection of content and the copy restriction condition are observed. Information exchange for each other, and if there is no problem, mutual connection is permitted. If there is no point in connecting to each other, such as when the devices are input-only devices or output-only devices, or when the content copyright protection and copy restriction conditions are violated, the connection processing is performed. The process is stopped, and a message to that effect is displayed on each device. In this way, if there is no problem with the copyright protection and copy restriction conditions of the content, connection is established and video, audio, etc. are transmitted from the video equipment 100 to the video display device 200.

  FIG. 5 is a second embodiment of the present invention and is a diagram showing another configuration of the image display device 200 shown in FIG. 5 is partly common to the embodiment shown in FIG. 4, and the common parts are given the same reference numerals and detailed description thereof is omitted. The video display device 200 shown in FIG. 5 includes an encryption/decryption circuit 212, encryption/decryption circuits 245 and 290, compression/transcoding circuits 291, 292, and a duplication control circuit 293 which is a multiplexing circuit.

  In the embodiment shown in FIG. 5, when the baseband signal is input from the terminal 201 or the terminal 202, the operation is similar to that of the embodiment shown in FIG. The compression/transcoding circuits 292 and 291 operate as compression circuits for baseband signals. When the compressed signal is input from the terminal 201 or the terminal 202, the encryption necessary for transmission is decrypted by the encryption/decryption circuit 212 via the input/output interface 210, and the video signal compressed by the demultiplexing circuit 250 is transmitted. It is separated into a compressed audio signal. The respective signals are input to the duplication control circuit 290, and the duplication propriety is judged from the information indicating the duplication propriety. When the duplication is possible, the compression/transcoding circuits 291 and 292 reduce the bit rates of the compressed video signal and the compressed audio signal by using a compression method with higher compression efficiency, if necessary. It The output signals of the compression/transcoding circuits 291 and 292 are multiplexed by the multiplexing circuit 293 and input to the encryption/decryption circuit 245. Here, when the duplication control circuit 290 detects that duplication is permitted, the encryption/decryption circuit 245 performs an encryption process for appropriate accumulation on the input signal and accumulates it. It is stored in the device 230 and/or the memory 221. When reproducing the stored signal, the reproduction/reproduction signals from the storage device 230 and the memory 221 are decrypted by the encryption/decryption circuit 245 and separated by the demultiplexing circuit 241 into a video signal and an audio signal. After that, the same processing as above can be performed for viewing. When viewing while accumulating in the storage device 230 or the memory 221, the signal from the multiplexing circuit 293 is input to the demultiplexing circuit 241 via the encryption/decryption circuit 245 and processed in the same manner. In this case, the transcoded image quality can be confirmed. In the case of direct viewing without accumulation, a signal is input from the encryption/decryption circuit 212 to the demultiplexing circuit 241 via the encryption/decryption circuit 245, where it is separated into a video signal and an audio signal, and so on. Is processed.

  In the embodiment shown in FIG. 5, transcoding is performed even when a compressed signal is input, so that the data can be efficiently stored at a higher compression rate. In addition, in the present embodiment, an example is shown in which the compression circuits 111 and 113 as well as the means for performing signal processing are realized by circuits. However, various circuit elements may be configured by software means to perform the above-described processing, and even in that case, the same effect can be obtained. The invention does not limit how the signal processing is implemented.

100 video equipment 121, 221, 321 memory 122, 222 wireless interface 110 imaging device 111, 113, 281, 282, 291, 292 compression circuit 112 microphone 114 sensor 116, 170, 283, 293 multiplex circuit 124, 150, 151, 224 , 251, 252 signal processing circuit 130, 230 storage device 140, 240, 245 encryption/decryption circuit 141, 250, 241 demultiplexing circuit 142, 143, 242, 243 decompression circuit 160 display device 161, 270 audio output device 171 cipher Circuit 180 Broadcast receiver 200 Video display device 211, 212 Encryption/decryption circuit 260 Display 280 Copy control circuit 300 Receiver

Claims (13)

In the display device,
A first interface unit capable of wirelessly inputting compressed image information from an external device;
A second interface unit capable of inputting compressed image information by wire from an external device;
A third interface unit capable of inputting uncompressed image information from an external device by wire;
A decompression unit capable of decompressing the compressed image information input to the first interface unit or the second interface unit;
A first image based on image information obtained by expanding the compressed image information input to the first interface unit by the expansion unit, and the compressed image information input to the second interface unit is expanded by the expansion unit. A second image based on the image information, or a display unit capable of displaying a third image based on the non-compressed image information input to the third interface unit,
In the case of displaying the first image on the display unit, based on an operation for displaying a slide show on the input device of the display device,
The first interface unit wirelessly transmits a first signal for outputting compressed image information from an external device to the external device, and wirelessly inputs the compressed image information output from the external device. The display unit performs a slide show display at predetermined time intervals using a plurality of first images based on the image information obtained by expanding the input compressed image information by the expansion unit,
In the case of displaying the second image on the display unit, based on an operation for displaying a slide show on the input device of the display device,
The second interface unit transmits a second signal for outputting the compressed image information from the external device to the external device by wire, and inputs the compressed image information output from the external device by wire. , The display unit performs slide show display at predetermined time intervals using a plurality of second images based on the input compressed image information,
In the case of displaying the third image on the display unit, based on an operation for displaying a slide show on the input device of the display device,
The third interface unit transmits a third signal for converting the compressed image information to non-compressed image information by an external device and outputting the non-compressed image information to the external device by wire, and the non-compressed signal output from the external device By inputting image information by wire, the display unit performs slide show display at predetermined time intervals using a plurality of third images based on the input uncompressed image information,
A display device characterized by the above.   The display device according to claim 1, wherein a predetermined time interval of slide show display using the first image or a predetermined time interval of slide show display using the second image is an operation performed on the input device of the display device. A display device characterized by being changeable by.   The display device according to claim 1, wherein the image based on the compressed image information input to the first interface unit or the second interface unit is rotated based on an operation of the input device, and the display unit is rotated. A display device which is capable of being displayed on.   The display device according to any one of claims 1 to 3, wherein attribute information of compressed image information of the external device can be added or changed according to an operation of the input device of the display device. Display device. The display device according to any one of claims 1 to 4, wherein the first interface unit transmits the first signal to the external device via the network, and from the external device via the network A display device characterized by inputting a compressed video signal. In the display device,
A LAN interface unit capable of inputting compressed image information from an external device via a network,
A USB interface unit that can input compressed image information from an external device,
A decompression unit capable of decompressing the compressed image information input to the LAN interface unit or the USB interface unit;
An HDMI interface unit capable of inputting uncompressed image information from an external device,
A first image based on image information obtained by expanding the compressed image information input to the LAN interface unit by the expansion unit, or based on image information obtained by expanding compressed image information input to the USB interface unit by the expansion unit A display unit capable of displaying a second image or a third image based on the non-compressed image information input to the HDMI interface unit,
In the case of displaying the first image on the display unit, based on an operation for displaying a slide show on the input device of the display device,
The LAN interface unit transmits a first signal for outputting compressed image information from an external device to the external device via the network, and the compressed image information output from the external device via the network. By inputting, the display unit performs a slide show display at a predetermined time interval using a plurality of first images based on the image information expanded by the expansion unit of the input compressed image information,
In the case of displaying the second image on the display unit, based on an operation for displaying a slide show on the input device of the display device,
The USB interface unit transmits a second signal for outputting compressed image information from an external device to the external device, and inputs the compressed image information output from the external device, whereby the display unit: Performing slide show display at predetermined time intervals using a plurality of second images based on the input compressed image information,
In cases where Ru to display the third image on the display unit, based on the operation for the slide show display with respect to the input device of the display device,
The HDMI interface unit transmits to the external device a third signal for converting the compressed image information into the non-compressed image information and outputting the non-compressed image information by the external device, and inputs the non-compressed image information output from the external device. By doing so, the display unit performs a slide show display at a predetermined time interval using a plurality of third images based on the input uncompressed image information,
A display device characterized by the above.   The display device according to claim 6, wherein a predetermined time interval of slide show display using the first image or a predetermined time interval of slide show display using the second image is an operation performed on the input device of the display device. A display device characterized by being changeable by.   The display device according to claim 6 or 7, wherein an image based on compressed image information input to the USB interface unit or the LAN interface unit can be rotated and displayed on the display unit based on an operation of the input device. A display device characterized by the above.   The display device according to any one of claims 6 to 8, wherein attribute information of compressed image information of the external device can be added or changed according to an operation of the input device of the display device. Display device.   10. The display device according to claim 6, wherein the LAN interface unit is a wireless LAN interface. The display device according to claim 4, wherein the attribute information includes information regarding erasure prevention of the compressed image information. The display device according to claim 4 or 9, wherein the attribute information includes information regarding rotation of the compressed image information. The display device according to any one of claims 1 to 12, wherein the input device of the display device is a remote controller or a keyboard of the display device.

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