JP2012222426A - Video distribution system, video transmission device and video reproduction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video distribution system that, even when a plurality of video reproduction devices with different reproduction capabilities are connected to a communication network, can avoid increase in processing load of stream generation in a video distribution server.SOLUTION: A server 2 transmits a stream S1 for reproducing a low-resolution two-dimensional video, a stream S2 that is a difference between a low-resolution three-dimensional video and the stream S1, a stream S3 that is a difference between a high-resolution two-dimensional video and the stream S1 and a stream S4 that is a difference between the high-resolution three-dimensional video and the streams S1-S3. The video reproduction device reproduces a video by selecting a necessary stream from among the streams S1-S4.

Description

  The present invention relates to a video distribution system, a video transmission device, and a video reproduction device, and more particularly to a video distribution system, a video transmission device, and a video reproduction device that include a plurality of video reproduction devices having different reproduction capabilities.

  Patent Document 1 below discloses a video display device in which a user can view a 3D video by wearing dedicated glasses having liquid crystal shutters in both eyes. In the video display device, the left-view video and the right-view video are alternately displayed on the display screen at a predetermined cycle. Then, by controlling the liquid crystal shutter, the left eye of the glasses is in a translucent state and the right eye is in a light-shielded state in synchronization with the display timing of the left-view image, and the glasses are synchronized in synchronization with the display timing of the right-view image. By making the right eye light-transmitting and the left eye light-shielding, it is possible to view a 3D image.

Japanese Patent No. 3273074

  Video distribution systems that transmit a 2D video stream from a video distribution server to a video reproduction device via a communication network have been put into practical use. In this type of video distribution system, multiple types of video playback devices with different playback capabilities, such as televisions that support high-resolution 2D video playback and mobile terminals that support low-resolution 2D video playback, are communication networks. May be connected. As TVs and mobile terminals that support 3D video playback become more widespread in the future, the types of video playback devices connected to a communication network are expected to increase further. In such a situation where various video playback devices having different playback capabilities are connected to the communication network, a stream corresponding to the playback capability of each video playback device is individually generated by the video distribution server and is transmitted from the server to each video playback device. The transmission increases the processing load for stream generation in the video distribution server.

  The present invention has been made in view of such circumstances, and avoids an increase in the processing load of stream generation in the video distribution server even when a plurality of video playback devices having different playback capabilities are connected to the communication network. It is an object of the present invention to obtain a video distribution system, a video transmission device, and a video reproduction device that can be used.

  A video distribution system according to a first aspect of the present invention includes: a video transmission device that transmits a video stream to a video playback device; and the video playback device that receives and plays back the video stream, wherein the video transmission device includes: A first stream for reproducing a 2D video having a first resolution as the video stream; a second stream that is a difference between the 3D video having the first resolution and the first stream; , A third stream that is a difference between the first resolution and the second resolution two-dimensional video higher than the first resolution, the second resolution three-dimensional video, and the first to third A fourth stream that is a difference from the stream is transmitted, and the video playback device selects a required stream from the first to fourth streams to play back the video. Than is.

  According to the video distribution system according to the first aspect, the video transmission device transmits the first to fourth streams, and the video playback device corresponds to one kind of video called a 3D video of the second resolution. Necessary streams are selected from the first to fourth streams, and other types of video such as 2D video, 3D video, and 2D video of the second resolution are also reproduced. Therefore, for example, even when a plurality of video playback devices having different playback capabilities such as the resolution of reproducible video and the possibility of playback of 3D video are connected to the communication network, the video transmission devices are first to fourth. Therefore, it is sufficient to generate and transmit the stream to the communication network, so that it is possible to avoid an increase in the processing load of stream generation in the video transmission apparatus.

  The video delivery system according to the second aspect of the present invention is the video delivery system according to the first aspect, particularly when the video playback device plays back the 3D video of the second resolution. When the received third stream cannot be used or when the received third stream cannot be used due to loss, the first resolution video of the first stream is scaled up to generate the second resolution video. And replaying.

  According to the video distribution system according to the second aspect, when the video playback device cannot receive the third stream, or when the received third stream cannot be used due to loss, the video playback device When playing back the 3D video with the second resolution, the video with the second resolution is generated by scaling up the video with the first resolution of the first stream. As a result, even when the third stream cannot be received, it is possible to ensure the reproduction of the 3D video with the second resolution.

  The video delivery system according to the third aspect of the present invention is the video delivery system according to the first or second aspect, particularly when the video playback device plays back the 3D video of the second resolution. When the fourth stream cannot be received, or when the received fourth stream cannot be used due to a loss, the first resolution video of the second stream is scaled up to have the second resolution. It is characterized by generating and playing back video.

  According to the video distribution system according to the third aspect, when the video playback device cannot receive the fourth stream, or when the received fourth stream cannot be used due to a loss, the video playback device When playing back the 3D video with the second resolution, the video with the second resolution is generated by scaling up the video with the first resolution of the second stream. Thereby, even when the fourth stream cannot be received, it is possible to ensure the reproduction of the 3D video with the second resolution.

  The video distribution system according to a fourth aspect of the present invention is the video distribution system according to any one of the first to third aspects, and in particular, the video reproduction device reproduces the 3D video of the second resolution. When the second stream cannot be received, or when the received second stream cannot be used due to a loss, the first and third streams are substituted for the images of the second and fourth streams. The video of the stream is used.

  According to the video distribution system of the fourth aspect, when the video playback device cannot receive the second stream, or when the received second stream cannot be used due to a loss, the video playback device When playing back the 3D video of the second resolution, the video of the first and third streams is used instead of the video of the second and fourth streams. As a result, even when the second stream cannot be received, it is possible to guarantee the reproduction of the second resolution while maintaining the format of the 3D video although it is a 2D video.

  The video distribution system according to a fifth aspect of the present invention is the video distribution system according to any one of the first to fourth aspects, in particular, the video reproduction device reproduces the 3D video of the second resolution. When the second and third streams cannot be received, or when the received second and third streams cannot be used due to loss, the first resolution video of the first stream is displayed. The second resolution image is generated by scaling up, and the image is used in place of the second to fourth stream images.

  According to the video distribution system according to the fifth aspect, when the video reproduction device cannot receive the second and third streams, or when the received second and third streams cannot be used due to loss, The video playback apparatus scales up the first resolution video of the first stream to generate the second resolution video when playing back the 3D video of the second resolution. The video is used instead of the video of the stream. As a result, even when the second and third streams cannot be received, it is possible to guarantee the reproduction of the second resolution while maintaining the 3D video format although it is a 2D video.

  The video distribution system according to a sixth aspect of the present invention is the video distribution system according to any one of the first to fifth aspects, and in particular, the video reproduction device reproduces the 2D video of the second resolution. When the third stream cannot be received or when the received third stream cannot be used due to a loss, the first resolution video of the first stream is scaled up to It is characterized in that a video having a resolution of 2 is generated and played back.

  According to the video distribution system of the sixth aspect, when the video playback device cannot receive the third stream, or when the received third stream cannot be used due to a loss, the video playback device When playing back the 2D video of the second resolution, the video of the first resolution of the first stream is scaled up to generate the video of the second resolution. Thereby, even when the third stream cannot be received, it is possible to ensure reproduction of the second resolution.

  The video distribution system according to a seventh aspect of the present invention is the video distribution system according to any one of the first to sixth aspects, and in particular, the video reproduction device reproduces the 3D video of the first resolution. When the second stream cannot be received or the received second stream cannot be used due to a loss, the first stream video is used instead of the second stream video. It is characterized by doing.

  According to the video delivery system of the seventh aspect, when the video playback device cannot receive the second stream, or when the received second stream cannot be used due to loss, the video playback device When playing back the 3D video of the first resolution, the video of the first stream is used instead of the video of the second stream. As a result, even when the second stream cannot be received, it is possible to guarantee the reproduction of the video while maintaining the format of the 3D video although it is a 2D video.

  According to another aspect, the present invention can provide a video transmission device that transmits a video stream to a video reproduction device. The video transmission device is a first stream for reproducing a 2D video of a first resolution as the video stream, and a difference between the 3D video of the first resolution and the first stream. A second stream, a third stream that is the difference between the first resolution and the second resolution higher than the first resolution, and the first resolution three-dimensional video and the first resolution Thru | or the 4th stream which is a difference with a 3rd stream are produced | generated and transmitted.

  According to another aspect, the present invention can provide a video reproduction device that reproduces a video stream received from a video transmission device. The video reproduction device transmits a first stream for reproducing a two-dimensional video having a first resolution, transmitted from the video transmission device as the video stream, the three-dimensional video having the first resolution, and the first resolution. A second stream that is a difference from the stream, a third stream that is a difference between the two-dimensional video having a second resolution higher than the first resolution and the first stream, and a third order of the second resolution A necessary stream is selected from the fourth stream which is a difference between the original video and the first to third streams, and the video is reproduced.

  According to the present invention, it is possible to avoid an increase in the processing load for stream generation in the video distribution server even when a plurality of video playback devices having different playback capabilities are connected to the communication network.

It is a figure which shows the whole structure of the video delivery system which concerns on embodiment of this invention. It is a block diagram which simplifies and shows the structure of STB. It is a block diagram which simplifies and shows the structure of STB. It is a figure which shows the process of STB in the case of reproducing | regenerating the content of a three-dimensional video on a television. It is a block diagram which simplifies and shows the structure of a mobile terminal. It is a block diagram which simplifies and shows the structure of a mobile terminal. It is a figure which shows the relationship between the stream which STB receives, and the video signal used for reproduction | regeneration of an image | video. It is a figure which shows the relationship between the stream which STB receives, and the video signal used for reproduction | regeneration of an image | video. It is a figure which shows the relationship between the stream which a mobile terminal receives, and the video signal used for reproduction | regeneration of an image | video.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the element which attached | subjected the same code | symbol in different drawing shall show the same or corresponding element.

  FIG. 1 is a diagram showing an overall configuration of a video distribution system 1 according to an embodiment of the present invention. As shown in FIG. 1, a video distribution system 1 includes a server 2 and an STB (Set Top Box) 41 as a video playback device connected to the server 2 via a communication network 3 such as an IP (Internet Protocol) network. , 42, televisions 51, 52 such as liquid crystal display devices, and mobile terminals 43, 44 as video reproducing devices. The television 51 is connected to the STB 41, and the television 52 is connected to the STB 42. Note that the functions of the STBs 41 and 42 may be incorporated in the televisions 51 and 52. For example, the server 2 receives a broadcast wave of terrestrial digital broadcast or BS digital broadcast, and transmits a video transport stream (hereinafter referred to as “stream”) via the communication network 3. Device. The video distribution system 1 includes a plurality of video playback devices (STBs 41 and 42 and mobile terminals 43 and 44) having different resolutions of reproducible video and whether or not 3D video can be played back. Note that the video distribution system 1 may include a plurality of video playback devices that have the same resolution of reproducible video and whether or not 3D video can be played back.

  In the example illustrated in FIG. 1, the television 51 supports playback of high-definition (HD: High Definition) 2D video, and does not support playback of 3D video. The television 52 supports playback of high-resolution 3D video. The television 52 may support playback of high-resolution 2D video in addition to playback of high-resolution 3D video. The mobile terminal 43 supports playback of low resolution (SD: Standard Definition) 2D video, and does not support playback of 3D video. The mobile terminal 44 supports playback of low-resolution 3D video. The mobile terminal 44 may support playback of low-resolution 2D video in addition to playback of low-resolution 3D video. In this embodiment, an example in which there are two types of resolution (HD and SD) will be described, but the present invention is not limited to this example, and there may be three or more types of resolution. In addition, video playback devices other than the STBs 41 and 42 and the mobile terminals 43 and 44 illustrated in FIG. 1 may be connected to the communication network 3.

  The server 2 generates four streams S1 to S4 for the same content and transmits them to the communication network 3 (for example, multicast transmission). By using the four streams S1 to S4 together, it is possible to configure a high-resolution 3D video for the content. That is, the server 2 may generate a stream corresponding to a high-resolution 3D video for the content. In the present embodiment, each video playback device can perform playback according to each playback capability by combining and playing the necessary streams out of the four streams S1 to S4.

  The stream S1 is a stream representing a low-resolution 2D video, and can be used as a left-view video stream in the reproduction of a low-resolution 3D video. The stream S1 is, for example, a stream that is compression-encoded as a base view (Base View) in MVC (Multiview Video Coding).

  The stream S2 is a stream that is used together with the stream S1 to form a right-view video when playing back a low-resolution 3D video. The stream S2 is a stream that is compression-encoded as a non-base view by the MVC, and the stream S2 includes difference information from the stream S1 (that is, difference information between the left-view video and the right-view video regarding each frame). Is included.

  The stream S3 is a stream that is used together with the stream S1 when reproducing a high-resolution 2D video, and can be used as a left-view video stream in the reproduction of a high-resolution 3D video. The stream S3 is a stream that is compression-encoded by SVC (Scalable Video Coding). The stream S3 includes difference information from the stream S1 (that is, a high-resolution left-view video and a low-resolution left-view for each frame). Difference information from the video for use).

  The stream S4 is a stream that is used together with the stream S2 to form a right-view video when playing back a high-resolution 3D video. The stream S4 is a stream that is compression-encoded by SVC. The stream S4 includes difference information from the stream S2 (that is, the difference between the high-resolution right-view video and the low-resolution right-view video for each frame). Information).

  Here, the streams S1 to S4 can be transmitted using different packet identifiers (PIDs). Each video playback device can distinguish streams by their packet identifiers. When the server 2 transmits the streams S1 to S4 to the communication network 3, the communication priority may be set to different values for the streams S1 and S2 to S4. Desirably, the priority of the stream S1 as the Base view is set higher than the priority of the streams S2 to S4 as the Enhanced view. The communication priority can be set by, for example, a QoS (Quality of Service) rank. By setting the rank of the stream S1 high, the stream S1 is transmitted without causing data loss as much as possible.

  FIG. 2 is a block diagram showing the configuration of the STB 41 in a simplified manner. As shown in FIG. 2, the STB 41 includes a receiving unit 111, a buffer 121, a decoder 131, a video processing unit 141, and a transmitting unit 151. Since the television 51 connected to the STB 41 supports high-resolution 2D video playback (not 3D video playback), the reception unit 111 receives the stream S1 transmitted from the server 2. ˜S4, the streams S1 and S3 are selected and received from the communication network 3.

  The streams S1 and S3 are input from the receiving unit 111 to the buffer 121 and temporarily stored in the buffer 121. The streams S1 and S3 output from the buffer 121 are input to the decoder 131. The decoder 131 outputs a video signal by decoding the streams S1 and S3. The video signal output from the decoder 131 is input to the video processing unit 141. The video processing unit 141 generates and outputs a high-resolution video signal based on the low-resolution video signal of the stream S1 and the difference information of the stream S3. The video signal output from the video processing unit 141 is input to the transmission unit 151. The transmission unit 151 transmits the input video signal to the television 51, thereby reproducing a high-resolution 2D video on the television 51.

  FIG. 3 is a block diagram showing the configuration of the STB 42 in a simplified manner. As shown in FIG. 3, the STB 42 includes a reception unit 112, a buffer 122, a decoder 132, a video processing unit 142, and a transmission unit 152. Since the television 52 connected to the STB 42 supports playback of high-resolution 3D video, the receiving unit 112 selects all the streams S1 to S4 transmitted from the server 2 and receives them from the communication network 3. To do.

  The streams S1 to S4 are input from the receiving unit 112 to the buffer 122 and temporarily stored in the buffer 122. The streams S1 to S4 output from the buffer 122 are input to the decoder 132. The decoder 132 outputs a video signal by decoding the streams S1 to S4. The video signal output from the decoder 132 is input to the video processing unit 142. The video processing unit 142 generates and outputs a high-resolution left-view video signal based on the low-resolution video signal of the stream S1 and the difference information of the stream S3. Further, the video processing unit 142 generates a low-resolution video signal for right-viewing video based on the low-resolution video signal of the stream S1 and the difference information of the stream S2, and then the video signal and the stream Based on the difference information in S4, a high-resolution video signal for right-viewing video is generated and output. The video signal output from the video processing unit 142 is input to the transmission unit 152. The transmission unit 152 transmits the input video signal to the television 52, thereby reproducing a high-resolution 3D video on the television 52.

  FIG. 4 is a diagram showing the processing of the STB 42 when playing back 3D video content on the television 52. When reproducing 3D video, a left-view video and a right-view video reflecting human binocular parallax have a predetermined cycle (for example, a 1/120 second cycle. Left-view image and right-view image). The frame rate is 60 fps because one frame is composed of a pair of and. In the example shown in FIG. 4, the left-view video F0L of the 0th frame, the right-view video F0R of the 0th frame, the left-view video F1L of the first frame, the right-view video F1R of the first frame, the second The left-view video F2L for the frame, the right-view video F2R for the second frame, the left-view video F3L for the third frame, the right-view video F3R for the third frame,... Is displayed. In addition, when viewing 3D video, the user wears predetermined glasses in which a liquid crystal shutter is incorporated in both the left eye and the right eye. Then, in synchronization with the timing for displaying the left-view images F0L, F1L, F2L, F3L,... Of each frame on the display screen, the left eye of the glasses is in a translucent state (ON) and the right eye is in a light-shielded state ( OFF), and the right eye of the glasses is in a translucent state (ON) and the left eye is in sync with the timing of displaying the right-view images F0R, F1R, F2R, F3R,. The light shielding state is set (OFF).

  FIG. 5 is a block diagram showing the configuration of the mobile terminal 43 in a simplified manner. As shown in FIG. 5, the mobile terminal 43 includes a receiving unit 113, a buffer 123, a decoder 133, a video processing unit 143, and a display unit 153. Since the mobile terminal 43 supports playback of low-resolution 2D video (does not support playback of 3D video), the reception unit 113 includes, among the streams S1 to S4 transmitted from the server 2, The stream S1 is selected and received from the communication network 3.

  The stream S1 is input from the reception unit 113 to the buffer 123, and is temporarily stored in the buffer 123. The stream S1 output from the buffer 123 is input to the decoder 133. The decoder 133 outputs a video signal by decoding the stream S1. The video signal output from the decoder 133 is input to the video processing unit 143. The video processing unit 143 outputs a low-resolution video signal of the stream S1. The video signal output from the video processing unit 143 is input to the display unit 153, whereby a low-resolution two-dimensional video is reproduced on the display unit 153.

  FIG. 6 is a block diagram showing the configuration of the mobile terminal 44 in a simplified manner. As shown in FIG. 6, the mobile terminal 44 includes a receiving unit 114, a buffer 124, a decoder 134, a video processing unit 144, and a display unit 154. Since the mobile terminal 44 supports playback of low-resolution 3D video, the receiving unit 114 selects the streams S1 and S2 from the streams S1 to S4 transmitted from the server 2 and receives them from the communication network 3. To do.

  The streams S1 and S2 are input from the reception unit 114 to the buffer 124 and temporarily stored in the buffer 124. The streams S1 and S2 output from the buffer 124 are input to the decoder 134. The decoder 134 outputs video signals by decoding the streams S1 and S2. The video signal output from the decoder 134 is input to the video processing unit 144. The video processing unit 144 outputs a video signal of the low-resolution left-view video for the stream S1. The video processing unit 144 also generates and outputs a low-resolution right-view video signal based on the low-resolution left-view video signal of the stream S1 and the difference information of the stream S2. The video signal output from the video processing unit 144 is input to the display unit 154, whereby low-resolution 3D video is reproduced on the display unit 154.

  FIG. 7 is a diagram illustrating a relationship between a stream received by the STB 41 and a video signal used for video playback.

  As shown in item (A), when the STB 41 receives the streams S1 and S3 and the streams S1 and S3 are not missing (or are missing enough to be repaired by error concealment or error correction). The video processing unit 141 generates a high-resolution video signal based on the low-resolution video signal of the stream S1 and the difference information of the stream S3. The video signal is used to reproduce a high-resolution 2D video.

  As shown in the item (B), when the STB 41 does not receive the stream S3 due to a communication error or the like, or the stream S3 is missing so much that it cannot be repaired, the video processing unit 141 A high-resolution video signal can be generated by performing scaling-up processing such as pixel interpolation on the low-resolution video signal of S1. Then, the 2D video is reproduced using the generated high resolution 2D video signal.

  FIG. 8 is a diagram showing the relationship between a stream received by the STB 42 and a video signal used for video playback.

  As shown in the item (A), when the STB 41 receives the streams S1 to S4 and the streams S1 to S4 are not missing (or are missing enough to be repaired), the video processing unit 142 Based on the low-resolution video signal of the stream S1 and the difference information of the stream S3, a high-resolution video signal for left-viewing video is generated. Further, the video processing unit 142 generates a low-resolution video signal for right-viewing video based on the low-resolution video signal of the stream S1 and the difference information of the stream S2, and then the video signal and the stream Based on the difference information of S4, a video signal of a high-resolution right-view video is generated. Then, using the generated high-resolution left-view video and right-view video signals, 3D video is reproduced.

  As shown in the item (B), when the STB 42 does not receive the stream S3 due to a communication error or the like, or the stream S3 is missing so much that it cannot be repaired, the video processing unit 142 By performing a scaling-up process such as pixel interpolation on the low-resolution left-view video signal in S1, a high-resolution left-view video signal can be generated. Further, the video processing unit 142 generates a low-resolution video signal for right-viewing video based on the low-resolution video signal of the stream S1 and the difference information of the stream S2, and then the video signal and the stream Based on the difference information of S4, a video signal of a high-resolution right-view video is generated. Then, using the generated high-resolution left-view video and right-view video signals, 3D video is reproduced.

  As shown in the item (C), when the STB 42 does not receive the stream S4 due to a communication error or the like, or the stream S4 is missing so much that it cannot be repaired, the video processing unit 142 Based on the low-resolution video signal of S1 and the difference information of the stream S3, a high-resolution video signal for left-viewing video is generated. In addition, the video processing unit 142 generates a low-resolution video signal for right-viewing video based on the low-resolution video signal of the stream S1 and the difference information of the stream S2, and then outputs the video signal to the video signal. By performing scaling-up processing such as pixel interpolation, it is possible to generate a high-resolution video signal for right-viewing video. Then, using the generated high-resolution left-view video and right-view video signals, 3D video is reproduced.

  As shown in the item (D), when the STB 42 does not receive the streams S3 and S4 due to a communication error or the like, or the stream S3 and S4 are missing so much that they cannot be repaired, the video processing unit 142 performs a scaling-up process such as pixel interpolation on the video signal of the low-resolution left-view video in the stream S1, thereby generating a video signal of the high-resolution left-view video. In addition, the video processing unit 142 generates a low-resolution video signal for right-viewing video based on the low-resolution video signal of the stream S1 and the difference information of the stream S2, and then outputs the video signal to the video signal. By performing scaling-up processing such as pixel interpolation, it is possible to generate a high-resolution video signal for right-viewing video. Then, using the generated high-resolution left-view video and right-view video signals, 3D video is reproduced.

  As shown in the item (E), when the STB 42 does not receive the stream S2 due to a communication error or the like, or the stream S2 is missing so much that it cannot be repaired, the video processing unit 142 Based on the low-resolution video signal of S1 and the difference information of the stream S3, a high-resolution video signal for left-viewing video is generated. Further, the video processing unit 142 can use the high-resolution left-view video signal generated above instead of the high-resolution right-view video signal. That is, by displaying the high-definition left-view video not only during the left-view video display period but also during the right-view video display period, the 2D video is reproduced in the 3D video format.

  As shown in the item (F), when the STB 42 does not receive the streams S2 and S3 due to a communication error or the like, or the stream S2 and S3 are missing so much that they cannot be repaired, the video processing unit 142 performs a scaling-up process such as pixel interpolation on the video signal of the low-resolution left-view video in the stream S1, thereby generating a video signal of the high-resolution left-view video. Further, the video processing unit 142 can use the high-resolution left-view video signal generated above instead of the high-resolution right-view video signal. That is, by displaying the high-definition left-view video not only during the left-view video display period but also during the right-view video display period, the 2D video is reproduced in the 3D video format.

  FIG. 9 is a diagram illustrating a relationship between a stream received by the mobile terminal 44 and a video signal used for video playback.

  As shown in the item (A), when the mobile terminal 44 has received the streams S1 and S2 and the streams S1 and S2 are not missing (or are missing enough to be repaired), the video processing unit 144 generates a low-resolution right-view video signal based on the low-resolution left-view video signal of the stream S1 and the difference information of the stream S2. Then, using the low-resolution left-view video and right-view video signals, 3D video is reproduced.

  As shown in the item (B), when the mobile terminal 44 does not receive the stream S2 due to a communication error or the like, or the stream S2 is missing so much that it cannot be repaired, the video processing unit 144 Instead of the low-resolution right-view video signal, the low-resolution left-view video signal of the stream S1 can be used. That is, the low-resolution left-view video is displayed not only during the left-view video display period but also during the right-view video display period, thereby reproducing the 2D video in the 3D video format.

  As described above, according to the video distribution system 1 according to the present embodiment, the server 2 transmits the streams S1 to S4 to the communication network 3, and the STBs 41 and 42 and the mobile terminals 43 and 44 are included in the streams S1 to S4. A necessary stream is selected and received from the communication network 3 according to its own playback capability or the playback capability of the televisions 51 and 52 connected to itself. Therefore, even when a plurality of video playback devices having different playback capabilities such as the resolution of reproducible video and the possibility of playback of 3D video are connected to the communication network 3, the server 2 can maintain high resolution 3D video. Since it is sufficient to generate streams S1 to S4 equivalent to the only stream and transmit them to the communication network 3, it is possible to avoid an increase in the processing load of stream generation in the server 2.

  Further, according to the video distribution system 1 according to the present embodiment, as shown in the item (B) in FIG. 8, when the STB 42 that can reproduce the high-resolution 3D video cannot receive the stream S3, or If the received stream S3 cannot be used due to a loss, the STB 42 can generate a high-resolution left-view video based on the low-resolution left-view video in the stream S1. Thereby, even when the stream S3 cannot be received, it is possible to ensure the reproduction of the high-resolution 3D video.

  Further, according to the video distribution system 1 according to the present embodiment, as shown in the item (C) in FIG. 8, when the STB 42 that can reproduce the high-resolution 3D video cannot receive the stream S4, or If the received stream S4 cannot be used due to a loss, the STB 42 can generate a high-resolution right-view video based on the low-resolution right-view video of the stream S2. Accordingly, even when the stream S4 cannot be received, it is possible to ensure the reproduction of the high-resolution 3D video.

  Also, according to the video distribution system 1 according to the present embodiment, as shown in the item (E) in FIG. 8, when the STB 42 that can reproduce the high-resolution 3D video cannot receive the stream S2, or When the received stream S2 cannot be used due to a loss, the STB 42 can use the left-view video of the streams S1 and S3 instead of the right-view video of the streams S2 and S4. As a result, even when the stream S2 cannot be received, it is possible to ensure high-resolution reproduction although it is a two-dimensional video.

  Further, according to the video distribution system 1 according to the present embodiment, as shown in the item (F) in FIG. 8, the STB 42 that can reproduce the high-resolution 3D video cannot receive the streams S2 and S3. Alternatively, when the received streams S2 and S3 cannot be used due to a loss, the STB 42 generates a high-resolution left-view video based on the low-resolution left-view video of the stream S1, and the left-view video Can be used instead of the left-view video for the stream S3 and the right-view video for the streams S2 and S4. As a result, even when the streams S2 and S3 cannot be received, it is possible to ensure high-resolution playback although it is a 2D video.

  Further, according to the video distribution system 1 according to the present embodiment, as shown in the item (B) of FIG. 7, when the STB 41 that can reproduce the high-resolution 2D video cannot receive the stream S3, or When the received stream S3 cannot be used due to a loss, the STB 41 can generate a high-resolution video based on the low-resolution video of the stream S1. Thereby, even when the stream S3 cannot be received, it is possible to ensure high-resolution reproduction.

  Further, according to the video distribution system 1 according to the present embodiment, as shown in the item (B) of FIG. 9, the mobile terminal 44 that can reproduce the low-resolution 3D video cannot receive the stream S2. Alternatively, when the received stream S2 cannot be used due to a loss, the mobile terminal 44 can use the left-view video of the stream S1 instead of the right-view video of the stream S2. As a result, even when the stream S2 cannot be received, the reproduction of the video can be ensured although it is a two-dimensional video.

  In the video distribution system 1 according to the present embodiment, the server 2 transmits the streams S1 to S4 to the communication network 3. However, the server 2 can also change the stream to be transmitted depending on the video playback device to receive. In this case, for example, the video playback device includes its playback capability in the transmission request. The server 2 selects a stream to be transmitted to the video playback device from the streams S1 to S4 according to the received playback capability. Even if the stream to be transmitted on the server 2 side is selected, the server 2 only needs to perform encoding corresponding to only the high-resolution 3D video, and the low-resolution 2D video, the low-resolution 3D video, and the high-resolution. The processing load on the server 2 can be reduced as compared with the case where the two-dimensional video and the high-resolution three-dimensional video are encoded separately.

  Furthermore, in the video distribution system 1 according to the present embodiment, the video reproduction device selects and receives a necessary stream from the streams S1 to S4, but is not limited thereto. The video reproduction apparatus may receive a part or all of the streams S1 to S4, select a necessary stream from the received streams, and reproduce the selected stream.

  Furthermore, in the video distribution system 1 according to the present embodiment, each video playback device is one of a low-resolution 2D video, a low-resolution 3D video, a high-resolution 2D video, and a high-resolution 3D video. I was supposed to play one. However, the video playback device may be able to play back two or more of these videos. In this case, the video playback device selects a stream used for video playback from the streams S1 to S4, for example, in accordance with a playback mode designated by the user.

  The functions of the server 2 and each video playback device in the video distribution system 1 according to the present embodiment can also be realized by combining arithmetic circuits such as a CPU (Central Processing Unit) and DSP (Digital Signal Processor) and a program. However, it can also be realized using a dedicated processing circuit.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined not by the above-mentioned meaning but by the scope of claims for patent, and is intended to include all modifications within the scope and meaning equivalent to the scope of claims for patent.

2 Server 3 Communication network 41, 42 STB
43,44 Mobile terminal 51,52 Television 141-144 Video processing unit

Claims (9)

A video transmission device for transmitting a video stream to the video reproduction device;
The video playback device for receiving and playing back the video stream;
With
The video transmission device, as the video stream,
A first stream for playing back a 2D image of a first resolution;
A second stream that is a difference between the first resolution 3D video and the first stream;
A third stream that is a difference between the two-dimensional video of the second resolution higher than the first resolution and the first stream;
A fourth stream that is a difference between the 3D video of the second resolution and the first to third streams;
Send
The video playback apparatus, wherein the video playback device selects a necessary stream from the first to fourth streams and plays back the video.   When reproducing the 3D video of the second resolution, the video reproduction device cannot receive the third stream, or when the received third stream cannot be used due to a defect, The video distribution system according to claim 1, wherein the first resolution video of the stream is scaled up to generate and play back the second resolution video.   When reproducing the second resolution 3D video, the video reproduction device cannot receive the fourth stream, or when the received fourth stream cannot be used due to a loss, the second 3. The video distribution system according to claim 1, wherein the first resolution video of the first stream is scaled up to generate and play back the second resolution video. 4.   When reproducing the second resolution 3D image, the video reproduction device cannot receive the second stream, or when the received second stream cannot be used due to a loss, the second 4. The video distribution system according to claim 1, wherein the video of the first and third streams is used instead of the video of the fourth stream and the fourth stream. 5.   The video playback device, when playing back the 3D video of the second resolution, is unable to receive the second and third streams or is used due to a loss of the received second and third streams If not, the first resolution video of the first stream is scaled up to generate the second resolution video, and the video is used instead of the second to fourth stream videos. The video distribution system according to any one of claims 1 to 4.   When reproducing the second resolution 2D video, the video reproduction device cannot receive the third stream, or when the received third stream cannot be used due to a defect, The video distribution system according to claim 1, wherein the first resolution video of the first stream is scaled up to generate and play back the second resolution video.   When reproducing the first resolution 3D image, the video reproduction device cannot receive the second stream, or when the received second stream cannot be used due to a loss, The video distribution system according to claim 1, wherein the video of the first stream is used instead of the video of the first stream. A video transmission device for transmitting a video stream to a video playback device,
As the video stream,
A first stream for playing back a 2D image of a first resolution;
A second stream that is a difference between the first resolution 3D video and the first stream;
A third stream that is a difference between the two-dimensional video of the second resolution higher than the first resolution and the first stream;
A fourth stream that is a difference between the 3D video of the second resolution and the first to third streams;
A video transmission device that generates and transmits a video. A video playback device for playing back a video stream received from a video transmission device,
Transmitted as the video stream from the video transmission device,
A first stream for playing back a 2D image of a first resolution;
A second stream that is a difference between the first resolution 3D video and the first stream;
A third stream that is the difference between the first resolution and the second resolution higher than the first resolution; and the second resolution three-dimensional video and the first to third streams A video playback apparatus that plays back video by selecting a necessary stream from the fourth stream that is the difference between the first stream and the fourth stream.

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