JP4681329B2 - Display device - Google Patents

Description

  The present invention relates to a display device, such as digital broadcasting, suitable for a mobile object.

Conventional video display control techniques for display devices include, for example, a technique that automatically controls video characteristics according to the brightness of a room so as not to burden the eyes in a dark room, or light stimulation. There is a technique related to a filter that prevents a light sudden brain wave reaction.
On the other hand, in recent years, there have been cases in which light-sensitive seizures occur in the light sudden brain wave reaction in TV (television) viewers due to intermittent red blink video. It has been reported that these light-sensitive seizures occur at home in a room with relatively low illuminance and in a situation where the distance between the television receiver and the viewer is very close.
Japanese Patent Laid-Open No. 06-267664 Japanese Patent Laid-Open No. 10-174017 JP-A-10-210386 JP 2001-125526 A

  When watching TV on a moving object, for example, when a moving object is traveling in a dark area such as a tunnel, a viewer sitting on the back seat views a TV receiver with a bright and small screen in a dark car May occur. Such a viewing situation may be similar to an environment in which a light-sensitive seizure occurs when a specific video is viewed. In the above prior art, the method of controlling the brightness of the television receiver according to the external environment is mainly used, and when watching a movie having a clear color in recent years and a digital broadcast, a red video is blinking. Because there are often scenes to do, there may be an image where the luminance does not change so much and the hue changes greatly. When such a video appears, not only the external environment for viewing the video, but also the video content itself displayed on the television receiver can suppress the occurrence of light-sensitive seizures, so that more comfortable video content can be viewed. It is necessary to give some ingenuity.

  Accordingly, an object of the present invention is to provide a display device that can suppress the occurrence of light-sensitive seizures and can more comfortably view video content even when the brightness of the viewing environment changes.

In order to solve the above-described problem, in the present invention, an illuminance sensor device that measures the illuminance of a viewing environment in a television receiver that receives a broadcast wave of a television or the like and reproduces video content transmitted by the broadcast wave. When a motion vector detection apparatus for detecting a motion vector of the received video content and color (chroma) detector for detecting red chroma video, the measured illuminance and the motion vector detected from the image of the viewing environment Multiply the amount of change by the saturation of red detected by the color detection device, calculate an evaluation value divided by the illuminance measured by the optical sensor, and change the display of the video by changing the video display based on this evaluation value. A video control device is provided. This video control apparatus performs video operations such as changing the hue of the video, reducing the luminance, or thinning the frames to be displayed.

  In the display device of the present invention, an image change occurs suddenly by a motion vector detection device, a color detection device, and an image control device that changes the color tone of the image based on information from the illuminance sensor. When large video content data is received, the color tone of the video content is changed during digital buffering. Alternatively, by reducing the number of frames displayed per second, the blinking of the screen in a scene in which, for example, a red system screen that blinks intensely continues is reduced.

  Furthermore, for storage media video content such as DVDs, the luminance information is analyzed in advance and stored as information. The color tone at the time of display is changed, or the number of frames displayed per second is reduced. As a result, even if scenes that are likely to cause strong light stimulation continue, it is possible to enjoy viewing video content such as TV in the car more comfortably and safely by changing the display content in advance. .

  Hereinafter, the best mode (embodiment) for carrying out the present invention will be described with reference to the drawings.

<< First Embodiment >>
As a first embodiment of the present invention, a vehicle-mounted display device (vehicle-mounted television display device) in which the display device of the present invention is applied to a vehicle as a moving body will be described with reference to FIG. FIG. 1 is a block diagram illustrating a configuration of the in-vehicle display device according to the first embodiment.

  As shown in FIG. 1, an in-vehicle display device 100A includes a tuner (TV tuner) 102 for selecting and receiving a broadcast from radio waves received by a connected antenna 101, and a demodulator that demodulates the received broadcast into a digital signal. 103, a TS processing device 104 that separates various data included in the digital signal, a decoder 105 that converts the digital data separated by the TS processing device 104 into video, audio, and other data, and an in-vehicle display device 100A An illuminance sensor 106 that measures the degree of external light in the environment in which it is used is provided. Then, for the digital data related to the video after being decoded by the decoder 105, a motion vector detecting device 107 for calculating the sum of motion vectors for the video every predetermined (fixed) time, and after decoding by the decoder 105, A color detection device 108 for calculating the degree of color of the video is provided, and the quality of the digital data decoded by the decoder 105 is changed based on information from the illuminance sensor 106, the motion vector detection device 107, and the color detection device 108. Whether or not to perform the determination is determined by the determination device 109, and the quality of the digital data decoded by the decoder 105 is changed by the video control device 110 based on the calculation result of the determination device 109. Video and audio and other data from the video control device 110 are output from the playback device 111.

  The in-vehicle display device 100A further includes an I / O device 112 that accepts various input data, a ROM device 113 that stores programs and data required when the in-vehicle display device 100A is activated, and a RAM that temporarily stores data. A device 114, a recording device 115 for storing data of the in-vehicle display device 100A, a CPU 116 for operating the in-vehicle display device 100A, and a bus 161 for connecting these devices are provided. It is also possible to connect to the Internet via the communication device 173 and input the stream distribution data received via the Internet to the TS processing device 104 to reproduce the content (video content).

  In addition, for the signal lines 151 to 158 shown in the figure, the signal line 151 has an RF signal, the signal line 152 has a digital data (for example, transport stream) signal, and the signal lines 153 and 154 have digital data (for example, an electronic signal). In addition to the intensity signal from the illuminance sensor 106, the signal line 156, the decoded digital data, the attribute information about the video from the motion vector detection device 107 and the color detection device 108, and the illuminance Information about the illuminance of the viewing environment from the sensor 106 flows. The signal line 157 contains decoded digital data and a signal relating to the change policy of the digital data calculated by the determination device 109. The signal line 158 contains a VGA (Video Graphics Array) signal or NTSC (National Television Standards Committee), A video signal typified by PAL (Phase Alternating (by) Line), an audio signal typified by AAC (Advanced Audio Coding), WAV (WAVE file) format, and other signals related to text data flow.

  Next, the motion vector detection device 107 will be described. When an observer or object in the image moves, a change occurs on the screen. A motion vector corresponds to this change as a velocity vector at each point in the video, and corresponds to an amount of deviation from the corresponding position between two frames of the video, that is, a displacement per unit time. This motion vector is defined for each dot of video to be detected or for each unit of 8 × 8 or 16 × 16 dots called a macroblock. The sum of the magnitudes of the motion vectors for each dot or macroblock is obtained for each frame of the video, and is stored in the memory of the motion vector detection device 107 as an evaluation index.

  Next, the color detection device 108 will be described. The color detection device 108 is a device that detects the color in the video for each frame based on the video created by the decoding process as described above. As a color detection method, a calculation formula of L * a * b * uniform color space (hereinafter referred to as “CIELAB”) by the International Illumination Commission (CIE), which is generally known, is used in this embodiment. Of course, it is also possible to evaluate using other XYZ display systems or RGB color systems. In the CIELAB formula, the value of L * represents lightness. Further, a * and b * are chromaticity coordinates, where a * indicates the red / green axis, and the larger the value of a *, the more red, and the smaller the value, the green. B * indicates the yellow / blue axis, and the larger the value of b *, the more yellow, and the smaller the value, the blue. When the white tristimulus values based on Xw, Yw, and Zw, that is, the tristimulus values of illumination light, and X, Y, and Z are tristimulus values of the colors in the image, the calculation formula of CIELAB is as follows: Become.

L * = 116 (Y / Yw) ^ (1/3) -16
a * = 500 ((X / Xw) ^ (1/3)-(Y / Yw) ^ (1/3))
b * = 200 ((Y / Yw) ^ (1/3)-(Z / Xw) ^ (1/3))

  Here, in order to detect red, which is a color having a strong influence on human color vision, it is only necessary to calculate the value of a * from the decoded video and monitor the magnitude of the value. The value of a * detected by the calculation is stored in a buffer or memory in the color detection device 108.

  Next, the determination device 109 changes the decoded video based on the video information from the motion vector detection device 107 and the color detection device 108 and the external light situation during viewing based on the illuminance measured by the illuminance sensor 106. Decide whether or not. It is said that a light-sensitive seizure is particularly likely to occur when a blinking video of a red system blinks at 10 to 30 Hz in a relatively dark room. Therefore, in the in-vehicle display device 100A of the present embodiment, the image obtained by the color detection device 108 is a red image having a large a * value and the motion vector change amount Σν obtained by the motion vector detection device 107. Is large and the illuminance λ measured by the illuminance sensor 106 is low, it is determined that there is a possibility of strong light stimulation that increases the possibility of occurrence of a photosensitive attack.

For this reason, when the evaluation function f of the following expression 1 becomes larger than a preset threshold value, the video control device 110 is represented by a change in the color of the video, that is, the content, or a change in the number of display frames per second. By controlling the image, the light stimulus is suppressed.
f = ((a * × Σν) / λ) (Formula 1)

In Equation 1, it is implicitly assumed that a *, Σν, and λ equally affect human visual stimuli, but each of a *, Σν, and λ has an effect on human visual stimuli. The weighting factors p1, p2, and p3 corresponding to the force can be multiplied by a *, Σν, and λ, respectively, to obtain an evaluation function as shown in Equation 2.
f = ((p1 × a *) × (p2 × Σν)) / (p3 × λ)) (Formula 2)

  However, p1, p2, and p3 are constants and p3 ≠ 0. As a method for determining the weighting coefficient at this time, a lot of sample data relating to each a *, Σν, λ and human visual stimulus is collected, and regression analysis or heuristic technique (for example, a neural network) is performed based on the collected data. By determining the relationship between the influence of a *, Σν, and λ on the visual stimulus using parameter determination by learning of the parameters or optimization method represented by parameter determination using fuzzy inference) It is possible. In the present embodiment, although three parameters of illuminance sensor value, motion vector change amount, and color are used, by tuning the values of the weighting factors p1, p2, and p3, each parameter is set for the evaluation function f. The amount of contribution can be changed.

  The video control device 110 is a device that uses the determination result in the determination device 109 to change the video data to be displayed during buffering performed after the video data is decoded. The change here refers to the number of frames to be reproduced by thinning out frames from the decoded video when it is determined that the determination result regarding the evaluation function f of the determination device 109 is the content that needs to be changed. It is a process to reduce. Alternatively, video data can be changed by reducing the number of frames, changing the video saturation to black and white video even if the decoded video is color video, or reducing the video a * value. To reduce the red color or to further reduce the number of frames to stop still image display, to lower the brightness L * and to change the screen brightness, to send the video signal to the playback device 111 Stop and black out the video to output only the audio, or output only the audio for the received content, and display the still image stored in advance on the screen of the playback device 111. Only one of the video operations represented by the processing such as displaying only the part where the value of the motion vector in the video is small and both sides do not move violently on the screen of the playback device 111, or changing the hue of the video, Change saturation It refers to a video operation that combines the thinning of the frame.

  In the video control device 110, when it is determined that the video needs to be changed, the number of frames to be reproduced per second is thinned to reduce the number of frames, or the color of the video to be reproduced is changed at a stroke. It can be changed gradually. For example, let us consider a case where an image that is normally played back at about 30 frames / second is reduced to 5 frames / second by reducing the number of frames played back every second by reducing every five frames to reduce light stimulation. In this case, instead of reducing from 30 frames / second to 5 frames / second at a time, the first few seconds from the state of playback at 30 frames / second are played every other frame and dropped to 15 frames / second. After that, the frames to be gradually reproduced may be thinned out in such a manner that every two frames are reproduced to 10 frames / second and finally to 5 frames / second. In addition, when the video is in a control state (for example, a state in which frames to be reproduced are thinned out and reproduced at 5 frames / second) different from the original reproduction state (for example, a state of reproduction at 30 frames / second), the original control is performed. Even when returning to the non-display state, as in the previous example, instead of returning from the state of reproducing at 5 frames / second, for example, to the state of reproducing at 30 frames / second at a time, 5 frames / second, 10 frames / second The number of frames that are thinned out in stages, such as seconds, 15 frames / second, and 30 frames / second, may be reduced. Such gradual content change can be applied not only to changing the number of frames to be reproduced per second but also to changing the color of the video.

  The video on which these video operations have been performed is displayed on the playback device 111. In the playback device 111 of the present embodiment, the user is informed of the current playback state of the content by presenting whether the original content is displayed or whether the video has been changed by the video control device 110. It has a function.

  A detailed example of display on the playback apparatus 111 will be described with reference to FIG. Reference numerals 201, 202, and 203 in FIG. 2 are all displays.

  The display example of the display 201 is a format in which a watermark 211 is put in the screen. This is because the determination device 109 determines that it is necessary to change the video, and when the video changed by the video control device 110 is reproduced, the data of a predetermined watermark is superimposed on the screen. The watermark is not limited to a character string, and may be a still image such as an icon. At this time, if the watermark appears and disappears frequently, conversely, it may be possible to prevent comfortable viewing of the screen. Therefore, once the watermark appears or disappears, it is displayed or erased continuously for a certain period of time. The superimposition display state is controlled so as to maintain the displayed state.

  The display example of the display 202 indicates that the video displayed on the screen is not the original video of the content but is changed by the video control device 110 and the video with reduced visual stimulation is displayed on the screen. In this example, the telop 212 is superimposed and displayed. This telop may be a static display or a display that slowly flows from right to left.

  The display example of the display 203 is an example in which a message indicating that a video that has been changed by the video control device 110 and reduced visual stimulation is displayed on the screen is drawn in an L-shaped display area. A telop 212 is drawn in an L-shaped display area that is distinguished from the area 221. The video display area 221 has a fixed size in which the video control device 110 secures an L-shaped display area in which the message display does not overlap the video while maintaining the aspect ratio of the screen in order to make the video easier to see. And Alternatively, the video control device 110 (a display area adjusting unit (not shown) of the video control device 110) sets the magnitude inversely proportional to the degree of deviation between the value of the evaluation function f calculated by the determination device 109 and the set threshold value. Thus, for example, it is possible to reduce the visual stimulation by the displayed image by making the display area 221 smaller as the degree of the evaluation function f exceeding the threshold value increases. In this case, a theoretical upper limit value and a threshold value of the evaluation function f calculated by the determination device 109 are obtained, and a screen is displayed according to a value obtained by normalizing the value of the evaluation function f calculated by the determination device 109 using these numerical values. It is better to change the size. This is because the display area 221 can be made smaller or restored with linear characteristics between the threshold value and the upper limit value. In addition, a video that has been changed by the video control device 110 and has reduced visual stimulation is being displayed on the screen, and it is also possible to notify the viewer that the video has changed from the original.

  In the first embodiment of the present invention described so far, the motion vector detection device 107, the color detection device 108, and the determination device 109 are related to the in-vehicle display device 100A that is a terminal that receives a stream type digital broadcast after video decoding. By providing the video control device 110, it is possible to reduce the light stimulation caused by the video even while watching a severe video in which the viewing environment changes rapidly together with the illuminance detection value of the illuminance sensor 106. As a result, even when the brightness of the viewing environment changes, it is possible to suppress the occurrence of light-sensitive seizures and to allow more comfortable viewing of video content, so that viewers can view videos more comfortably and comfortably. Can be enjoyed.

<< Second Embodiment >>
Next, as a second embodiment in which the display device of the present invention is applied to a vehicle as a moving body, an in-vehicle display device for viewing a storage medium represented by a DVD in a vehicle will be described with reference to FIG. explain. FIG. 3 is a block diagram showing the configuration of the in-vehicle display device according to the second embodiment of the present invention. The in-vehicle display device 100B in FIG. 3 is substantially the same as the in-vehicle display device 100A in FIG. 1, and therefore, common portions are denoted by the same reference numerals and description thereof is omitted, and the differences from FIG. explain.

  In the first embodiment described above, the content to be reproduced was distributed by broadcasting. However, in the second embodiment shown in FIG. 3, the content is stored in the DVD reader 171 from the DVD 170 as a storage medium. Is read. Of course, when the storage medium is other than DVD, the content read by the reading device corresponding to the storage medium is reproduced. In the in-vehicle display device 100B shown in FIG. 3, since the content from the storage medium is analyzed and reproduced in real time, the configuration after the decoder 105 is the same as that of the first embodiment.

  Also, depending on the storage medium, storage media attribute information such as information on video movement or color related to the content recorded on the storage medium and content arrangement information on the storage medium may be stored in advance in a track of the storage medium in time series. It is assumed to be additionally included. An example of a format of attribute information of the storage medium recorded on the track of the storage medium is shown in FIG. The attribute information of the storage medium includes the track ID 401, the playback time 402 of each track with the beginning of the content as the origin, the motion vector information 403 and color information 404 of the video in the track, and the evaluation value 405 by the evaluation function for the video in the track. Consists of each item. The motion vector information 403 and the color information 404 are calculated in advance using the same mathematical expressions as those described in the first embodiment. Each track corresponds to a storage unit of content. For example, a different track is assigned every time a scene changes in a video. Therefore, in this storage unit, for example, the same scene continues, and the change in the image is small, and the image characteristics can be regarded as almost uniform.

  Even in the in-vehicle display device 100B of the second embodiment, similarly to the in-vehicle display device 100A of the first embodiment, even when the brightness of the viewing environment changes, the occurrence of light-sensitive seizures is suppressed and more comfortable. Video content can be viewed, and thus the viewer can enjoy comfortable and comfortable video viewing.

  Here, a modification of the second embodiment will be described. In this modified example, (1) attribute information including information on motion vectors in video for each storage unit of video content and information on color in video for each storage unit is acquired by communication with the outside and stored in a storage device. (2) At the time of reproduction, information on the magnitude and color of the motion vector corresponding to the video to be reproduced is obtained from the attribute information stored in the storage device, and (3) the motion vector thus obtained is obtained. The change which reduces the change of the image | video to display is performed from the magnitude | size of this, the said color, and the illumination intensity measured with the said optical sensor.

  Specifically, in the modification of the second embodiment, the in-vehicle display device 100C (see FIG. 5) is connected to the Internet via the communication device 173, and is displayed on the Internet based on the ID information of the storage medium. The storage medium attribute information as shown in FIG. 4 is searched, and the search result is read and recorded in the recording device 115. Then, when reproducing the content recorded on the storage medium, motion vector information, color information or evaluation value information based on the evaluation function corresponding to the content to be reproduced is extracted from the attribute information of the storage medium recorded on the recording device 115, It is also possible to pass the information to the determination device 109.

  The configuration of the in-vehicle display device 100C in such a case is shown in FIG. In this case, in the determination device 109, the video control device 110 performs the first embodiment based on the information from the illuminance sensor 106 and the characteristic information of the content shown in FIG. 4 acquired from the recording device 115 via the bus 161. As in the example shown in FIG. When the in-vehicle display device 100C obtains the video information of the content shown in FIG. 4 from the content information management center 300 via the Internet, the in-vehicle display device 100C transmits the ID information of the storage medium to the content information management center 300. From the content information management center 300 that manages the video information of the content, the content information regarding the storage medium is transmitted to the in-vehicle display device 100C. Thereby, the evaluation value 405 of the evaluation function shown in FIG. 4 stored in the recording device 115 can be updated to one corresponding to the new DVD 170.

  In the second embodiment (and the modification), although an example in which the DVD 170 is used as the storage medium has been described, a large-capacity storage medium represented by a hard disk is used for the recording device 115 provided in the in-vehicle display device 100B. It is possible to realize the functions of the present invention with a similar mechanism even for server-type broadcast received contents stored in the recording device 115. In the server type broadcasting, in the configuration including the recording device 115 and the communication device 173, after receiving the digital broadcasting, the content itself and auxiliary data in which information about the video related to the content is selected are selected and recorded in the recording device 115. To do. When there is no auxiliary data corresponding to the content in the recording device 115, the video is analyzed in real time as shown in the first embodiment. On the other hand, if auxiliary data exists in the recording device 115, the determination device 109 determines whether or not a video change is necessary based on the auxiliary data and the data from the illuminance sensor 106. . The availability of these auxiliary data is inquired to a server-type broadcast contractor via a communication line. If a contract is made, an encryption key is installed in the vehicle so that the auxiliary data can be used. It is sent to the terminal so that auxiliary data cannot be used when no contract is made. In this way, it is possible to provide a higher service to the viewer by combining with the contract pattern. The auxiliary data can also be broadcast as a digital broadcast data broadcast. Also in this case, it is stored in the recording device 115 in the terminal, and the video change process can be performed in the same manner as in the above example.

  In the modification of the second embodiment of the present invention, it is possible to perform an operation for reducing light stimulation at a high speed by simultaneously storing information relating to video in a storage medium in advance. In addition, by acquiring information related to the video from the outside, the video is controlled by the newly updated evaluation function, so that the content in the car can be viewed comfortably and comfortably.

  This is effective in a case where the visual stimulus caused by the light of the display device is reduced according to the viewing state when displaying / reproducing content in a moving vehicle in which the viewing environment changes rapidly.

The block diagram which shows the structure of the vehicle-mounted display apparatus of the 1st Embodiment of this invention. Figure showing an example of the display screen The block diagram which shows the structure of the vehicle-mounted display apparatus of the 2nd Embodiment of this invention. Figure showing format example of attribute information The block diagram which shows the structure of the vehicle-mounted display apparatus of the modification of the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100A * 100B * 100C ... Vehicle-mounted display apparatus, 101 ... Antenna, 102 ... Tuner, 103 ... Demodulator, 104 ... TS processing apparatus, 105 ... Decoder, 106 ... Illuminance sensor, 107 ... Motion vector detection apparatus, 108 ... Color detection apparatus , 109 ... determination device, 110 ... video control device, 111 ... reproduction device, 112 ... I / O device, 113 ... ROM device, 114 ... RAM device, 115 ... recording device, 116 ... CPU, 161 ... bus, 173 ... communication apparatus

Claims (12)

In a display device for playing back video content,
An optical sensor that measures the illuminance of the viewing environment;
A motion vector detection device for detecting a change amount of a motion vector of a video of the video content;
A color detection device for detecting red saturation of the video content video;
Multiplying the amount of change of the motion vector detected by the motion vector detection device by the red saturation detected by the color detection device, and calculating an evaluation value divided by the illuminance measured by the photosensor, And a video control device that performs a change to reduce a change in the video to be displayed based on the value .   2. The display device according to claim 1, wherein the video content is acquired by receiving broadcast waves or reading data stored in a medium. In a display device that includes a reading unit that reads video content stored in a medium and a decoder that converts the read video content into video information, and reproduces the video information converted by the decoder,
And record device attribute information serial to record containing information on the change amount of the motion vector, and information about the red saturation in a video of each of the storage units in the video storage per unit before Kiutsu image content,
An optical sensor that measures the illuminance of the viewing environment;
Change amount of the motion vector corresponding to the image to be reproduced from the attribute information recorded in the Symbol recording device, and obtain information regarding the red saturation, the red color to the variation of the motion vectors thus obtained A video control device that multiplies degrees and calculates an evaluation value divided by the illuminance measured by the optical sensor, and performs a change to reduce a change in video to be reproduced and displayed based on the evaluation value. A display device. The display device according to claim 3 further includes:
  A motion vector detection device for detecting a change amount of a motion vector of a video of the video content;
  A color detection device for detecting red saturation of the video content video,
  When the attribute information related to the video content cannot be acquired, the motion vector detection device detects the change amount of the motion vector, and the color detection device detects the red saturation. Multiply the amount of change in the motion vector obtained by the saturation of red, and calculate an evaluation value divided by the illuminance measured by the photosensor, and reduce the change in the displayed video based on the evaluation value A video control device to make changes
  A display device comprising: The display device according to claim 3 or claim 4,
  The video for each storage unit of the video content is a video in each track stored in the media,
  The video content and the attribute information are acquired by reading data stored in the medium and recorded on the recording device.
  A display device characterized by that. The display device according to claim 3 or claim 4,
  The video for each storage unit of the video content is a video in each track stored in the media,
  The attribute information is acquired via the Internet based on the ID information of the medium and recorded on the recording device.
  A display device characterized by that. A recording device for storing the received content of the server-type broadcast; a reading unit for reading the video content stored in the recording device; and a decoder for converting the read video content into video information. In a display device for reproducing video information,
  An optical sensor that measures the illuminance of the viewing environment;
  Information on the change amount of the motion vector corresponding to the video to be reproduced and the red saturation is obtained from the attribute information recorded on the recording device, and the red saturation is obtained as the change amount of the motion vector thus obtained. And calculating an evaluation value divided by the illuminance measured by the optical sensor, and based on the evaluation value, a video control device that performs a change to reduce a change in video to be displayed, and
  The attribute information is acquired by auxiliary data in which information about the video content is described,
  The recording apparatus further records attribute information including information relating to a change amount of a motion vector in a video for each storage unit of the video content and information relating to red saturation in the video for each storage unit.
  A display device characterized by that. The display device according to claim 7,
  Inquire the server through the communication line,
  A display device, comprising: an encryption key that makes the auxiliary data available from the server. The display device according to claim 7,
  The display device, wherein the attribute information is acquired by data broadcasting of the digital broadcasting. The display device according to any one of claims 1 to 9 ,
Changes to reduce the change in the image to be displayed in the image control device for changing the display of the image, a process of gradually changing the thinning playback frame per unit of video time, the hue of the image color of red is gradually At least one of processing for reducing, processing for enlarging and displaying an area in which the amount of change in the motion vector in the video is smaller than a predetermined value , and processing for reducing the video display area based on the evaluation value A display device characterized by being one process. The fact that a change that reduces the change in the image is being performed is displayed by at least one of a message displayed in the watermark, icon, telop superimposed display, and L-shaped display area. 10. A display device according to any one of claims 1 to 9, wherein: The display device according to any one of claims 1 to 9, wherein a notification that a change to reduce a change in video is being made is made by voice.

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