Patent Publication Number: US-9888260-B2

Title: Information processing device, information processing method, and program

Description:
TECHNICAL FIELD 
     The present disclosure relates an information processing device, an information processing method, and a program. 
     The present disclosure contains subject matter related to that disclosed in U.S. National Stage Application under 35 U.S.C. § 371, based on International Application No. PCT/JP2013/004328, filed Jul. 16, 2013, which claims priority to Japanese Priority Patent Application JP 2012-165605 filed in the Japan Patent Office on Jul. 26, 2012, the entire content of which is hereby incorporated by reference. 
     BACKGROUND ART 
     According to a technology disclosed in PTL 1, an error correction code (ECC) is assigned to right-eye and left-eye images based on parallax information of the right-eye and left-eye images. 
     CITATION LIST 
     Patent Literature 
     [PTL 1] JP 2012-10066A 
     SUMMARY 
     Technical Problem 
     In the technology disclosed in PTL 1, however, when the error correction code (ECC) is generated, motion information of the right-eye and left-eye images is not considered. Therefore, the quality of the right-eye and left-eye images may deteriorate in network transmission. Accordingly, it is necessary to provide a technology capable of suppressing quality deterioration in the network transmission of the right-eye and left eye images. 
     Solution to Problem 
     Some embodiments provide for a system comprising at least one processor configured to perform: accessing parallax information for a first portion of a first image, the parallax information calculated based on a second image associated with the first image; accessing motion information for the first portion of the first image, the motion information calculated based on a third image captured at a different time than the first image; and generating error correction information for the first portion of the first image based on the parallax information and the motion information. 
     Some embodiments provide for a system comprising a first system, comprising at least one processor configured to perform: accessing parallax information for a first portion of a first image, the parallax information calculated based on a second image associated with the first image; accessing motion information for the first portion of the first image, the motion information calculated based on a third image captured at a different time than the first image; and generating error correction information for the first portion of the first image based on the parallax information and the motion information; encoding the first portion of the first image based at least in part on the error correction information to obtain a first encoded portion; and transmitting the first encoded portion and the error correction information to a second system; and the second system, configured to perform acts of: receiving the first encoded portion and the generated error correction information from the first system; and decoding the first encoded portion to obtain a first decoded portion. 
     Some embodiments provide for a method comprising: accessing parallax information for a first portion of a first image, the parallax information calculated based on a second image associated with the first image; accessing motion information for the first portion of the first image, the motion information calculated based on a third image captured at a different time than the first image; and generating error correction information for the first portion of the first image based on the parallax information and the motion information. 
     Some embodiments provide for a memory storing a program that, when executed by at least one processor, causes the at least one processor to perform: accessing parallax information for a first portion of a first image, the parallax information calculated based on a second image associated with the first image; accessing motion information for the first portion of the first image, the motion information calculated based on a third image captured at a different time than the first image; and generating error correction information for the first portion of the first image based on the parallax information and the motion information. 
     Some embodiments provide for a system comprising at least one processor configured to perform: accessing parallax information for a first portion of a first image, the parallax information calculated based on a second image associated with the first image; accessing motion information for the first portion of the first image, the motion information calculated based on a third image captured at different time than the first image; and executing error concealment processing for the first portion of the first image based on the parallax information and the motion information. 
     Some embodiments provide for a method comprising: accessing parallax information for a first portion of a first image, the parallax information calculated based on a second image associated with the first image; accessing motion information for the first portion of the first image, the motion information calculated based on a third image captured at a different time from the first image; and executing error concealment processing for the first portion of the first image based on the parallax information and the motion information. 
     Some embodiments provide for a memory storing a program that, when executed by at least one processor, causes the at least one processor to perform: accessing parallax information for a first portion of a first image, the parallax information calculated based on a second image associated with the first image; accessing motion information for the first portion of the first image, the motion information calculated based on a third image captured at a different time from the first image; and executing error concealment processing for the first portion of the first image based on the parallax information and the motion information. 
     According to an embodiment of the present disclosure, there is provided an information processing device including an encoding unit that extracts a criterion block from one image of right-eye and left-eye images, extracts a parallax reference block corresponding to the criterion block from the other image, and generates parallax information indicating a distance between a display position of the parallax reference block and a display position of the criterion block, extracts a motion reference block corresponding to the criterion block from the one image of a previous frame and generates motion information indicating a distance between a display position of the motion reference block and the display position of the criterion block, and generates error correction code (ECC) information to be assigned to the criterion block based on the parallax information and the motion information. 
     According to an embodiment of the present disclosure, there is provided an information processing device including a reception unit that receives error correction code (ECC) information from another information processing device that extracts a criterion block from one image of right-eye and left-eye images, extracts a parallax reference block corresponding to the criterion block from the other image, generates parallax information indicating a distance between a display position of the parallax reference block and a display position of the criterion block, extracts a motion reference block corresponding to the criterion block from the one image of a previous frame, generates motion information indicating a distance between a display position of the motion reference block and the display position of the criterion block, and generates the error correction code (ECC) information to be assigned to the criterion block based on the parallax information and the motion information, and a decoding unit that performs an error concealment process on the criterion block based on the parallax reference block and the motion reference block, when restoration of the criterion block based on the error correction code (ECC) information is not performed. 
     According to an embodiment of the present disclosure, there is provided an information processing method including extracting a criterion block from one image of right-eye and left-eye images, extracting a parallax reference block corresponding to the criterion block from the other image, and generating parallax information indicating a distance between a display position of the parallax reference block and a display position of the criterion block, extracting a motion reference block corresponding to the criterion block from the one image of a previous frame and generating motion information indicating a distance between a display position of the motion reference block and the display position of the criterion block, and generating error correction code (ECC) information to be assigned to the criterion block based on the parallax information and the motion information. 
     According to an embodiment of the present disclosure, there is provided an information processing method including receiving error correction code (ECC) information from another information processing device that extracts a criterion block from one image of right-eye and left-eye images, extracts a parallax reference block corresponding to the criterion block from the other image, generates parallax information indicating a distance between a display position of the parallax reference block and a display position of the criterion block, extracts a motion reference block corresponding to the criterion block from the one image of a previous frame, generates motion information indicating a distance between a display position of the motion reference block and the display position of the criterion block, and generates the error correction code (ECC) information to be assigned to the criterion block based on the parallax information and the motion information, and performing an error concealment process on the criterion block based on the parallax reference block and the motion reference block when restoration of the criterion block based on the error correction code (ECC) information is not performed. 
     According to an embodiment of the present disclosure, there is provided a program causing a computer to realize an encoding function of extracting a criterion block from one image of right-eye and left-eye images, extracting a parallax reference block corresponding to the criterion block from the other image, and generating parallax information indicating a distance between a display position of the parallax reference block and a display position of the criterion block, extracting a motion reference block corresponding to the criterion block from the one image of a previous frame and generating motion information indicating a distance between a display position of the motion reference block and the display position of the criterion block, and generating error correction code (ECC) information to be assigned to the criterion block based on the parallax information and the motion information. 
     According to an embodiment of the present disclosure, there is provided a program causing a computer to realize a reception function of receiving error correction code (ECC) information from another information processing device that extracts a criterion block from one image of right-eye and left-eye images, extracts a parallax reference block corresponding to the criterion block from the other image, generates parallax information indicating a distance between a display position of the parallax reference block and a display position of the criterion block, extracts a motion reference block corresponding to the criterion block from the one image of a previous frame, generates motion information indicating a distance between a display position of the motion reference block and the display position of the criterion block, and generates the error correction code (ECC) information to be assigned to the criterion block based on the parallax information and the motion information, and 
     decoding function of performing an error concealment process on the criterion block based on the parallax reference block and the motion reference block when restoration of the criterion block based on the error correction code (ECC) information is not performed. 
     According to the embodiments of the present disclosure, the error correction code (ECC) information assigned to the criterion block is generated based on the parallax information and the motion information. Thus, according to the technology according to the present disclosure, it is possible to assign the error correction code (ECC) information according to a motion of the criterion block. 
     Advantageous Effects of Invention 
     According to the embodiments of the disclosure described above, it is possible to suppress the equality deterioration in the network transmission of the right-eye and left-eye images. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a block diagram illustrating the configuration of an information processing system according to a first embodiment of the present disclosure. 
         FIG. 2  is an explanatory diagram illustrating the structure of a redundancy determination variable table according to the embodiment. 
         FIG. 3  is an explanatory diagram illustrating examples of a parallax vector (parallax information) and a motion vector (motion information). 
         FIG. 4  is an explanatory diagram illustrating a correlation between redundancy and the number of parity packets. 
         FIG. 5  is a flowchart illustrating a processing order by a transmission device (information processing device). 
         FIG. 6  is a flowchart illustrating a processing order by a reception device (information processing device). 
         FIG. 7  is a block diagram illustrating the configuration of an information processing system according to a second embodiment of the present disclosure. 
         FIG. 8  is an explanatory diagram illustrating the structure of a redundancy determination variable table according to the second embodiment. 
         FIG. 9  is an explanatory diagram illustrating an embodiment of the present disclosure. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the appended drawings. Through the specification and the drawings, the same reference numerals are given to constituent elements having substantially the same functional configurations and the repeated description thereof will be omitted. 
     The description will be made in the following order. 
     1. First embodiment (example in which two cameras are connected to transmission device) 
     1-1. Entire configuration of information processing system 
     1-2. Configurations of camera and transmission device 
     1-3. Configuration of reception device 
     1-4. Processing order by transmission device 
     1-5. Processing order by reception device 
     2. Second embodiment (example in which plurality of cameras are connected to transmission device via network) 
     3. Embodiment 
     &lt;1. First Embodiment&gt; 
     (1-1. Entire Configuration of Information Processing System) 
     First, the entire configuration of an information processing system  10 - 1  according to a first embodiment of the present disclosure will be described with reference to  FIG. 1 . The information processing system  10 - 1  includes cameras  20 L and  20 R, a transmission device  30 , a network  40 , a reception device  50 , and a display device  60 . The network  40  connects the transmission device  30  to the reception device  50 . 
     The camera  20 L captures a left-eye image (video) and transmits the left-eye image to the transmission device  30 . The left-eye image is an image that is perceived by the left eye of a user. The camera  20 R captures a right-eye image (video) and transmits the right-eye image to the transmission device  30 . The right-eye image is an image that is perceived by the right eye of the user. As illustrated in  FIG. 3 , an xy plane is set in the right-eye and left-eye images (hereinafter, also collectively referred to as “stereo images”). The horizontal direction is the x axis and the vertical direction is the y axis. Accordingly, the positions of respective pixels constituting right-eye and left-eye images are indicated by xy coordinates. 
     The transmission device  30  performs an FEC (Forward Error Correction) encoding process to be described below on the right-eye and left-eye images. That is, the transmission device  30  extracts a criterion block from one image of the right-eye and left-eye images and extracts a parallax reference block corresponding to the criterion block from the other image. Then, the transmission device  30  generates a parallax vector (parallax information) indicating a distance (parallax) between a display position of the parallax reference block and a display position of the criterion block. That is, the parallax vector is information that indicates parallax between the right-eye and left-eye images. 
     The transmission device  30  extracts a motion reference block corresponding to the criterion block from one image of a previous frame (for example, a frame one frame ahead of the current frame) and generates a motion vector (motion information) indicating a distance between a display position of the motion reference block and the display position of the criterion block. That is, the motion vector is information that indicates a motion amount by which the criterion block moves per unit time in the right-eye image (or the left-eye image). 
     Then, the transmission device  30  determines redundancy of a parity packet (error correction code (ECC) information) based on the parallax information, the motion information, and camera characteristics. Here, the camera characteristics are information that indicates installation environments, usages, or the like of the cameras  20 L and  20 R. The cameras  20 L and  20 R capture an image with a large motion or an image with large parallax according to the characteristics. Thus, the transmission device  30  determines a weight amount (priority) of the parallax information and the motion information based on the camera characteristics. That is, for example, when the camera  20 L captures a left-eye image with a large motion, the transmission device  30  enlarges a weight to the motion information. Then, the transmission device  30  determines redundancy based on the parallax information and the motion information subjected to the weighting. That is, the transmission device  30  sets the redundancy of the parity packet to a larger value when parallax of the criterion block is larger or the motion is larger. Then, the transmission device  30  generates a parity packet based on the redundancy. The transmission device  30  assigns the parity packet to both of the right-eye and left-eye images. 
     The transmission device  30  transmits, to the reception device  50 , the stereo images to which the parity packet is assigned. The reception device  50  restores the right-eye and left-eye images based on the parity packets and displays the right-eye and left-eye images on the display device  60 . When the restoration based on the parity packets is not achieved, the reception device  50  performs error concealment on the criterion block based on the parallax reference block and the motion reference block. Thus, the reception device  50  restores the stereo images. 
     Thus, the information processing system  10 - 1  transmits the stereo images captured by the cameras  20 L and  20 R to the reception device  50  via the network  40 . Accordingly, network delay or packet loss may occur. When the cameras  20 L and  20 R are so-called live cameras (cameras showing captured images on the display device  60  in real time), the stereo images displayed by the display device  60  particularly deteriorate with ease due to the network delay or the packet loss. 
     Accordingly, in the information processing system  10 - 1 , the parity packets are assigned to the stereo images on the transmission side and the restoration based on the parity packets is performed on the reception side. Further, the transmission device  30  increases the redundancy of the parity packets, the larger the parallax of the criterion block and the motion thereof are. This is due to the following reasons. 
     That is, in the stereo image, a block with large parallax is easily perceived as an image with a large stereoscopic sense (a stereoscopic sense in which a block is shown to protrude, that is, a stereoscopic video effect) by the user. That is, in the block with large parallax, the degree of influence on the stereoscopic video effect is large. According to PTL 1 described above, a parity packet with large redundancy is assigned to a block (packet) with large parallax. 
     On the other hand, as the dissertations of “QoE Evaluation in Stereoscopic Video Communication” and “Study on Image Quality Evaluation Method for Stereoscopic Video Delivery and System Configuration Technology” show, a block with a large motion is also perceived with ease as an image with a large stereoscopic sense by a user. However, PTL 1 does not consider a motion of a block. Therefore, in the technology disclosed in PTL 1, a parity packet with low redundancy may not avoid being assigned to packets constituting a block with a large motion. Accordingly, when the packets are lost, the restoration based on the parity packets may not be performed in some cases. In this case, video quality considerably deteriorates. Thus, in the first embodiment, a parity packet with large redundancy is assigned to a block with a large motion. Thus, in the first embodiment, it is possible to further improve video quality. 
     Further, PTL 1 does not consider camera characteristics. On the other hand, as described above, the cameras  20 L and  20 R capture images with a large motion or images with large parallax according to the characteristics. Therefore, in PTL 1, the redundancy of a parity packet may not be set appropriately in some cases. In the first embodiment, however, since the redundancy of the parity packet is determined according to the camera characteristics, it is possible to further improve video quality. 
     In PTL 1, when the restoration based on the parity packet is not performed, the error concealment is performed based on the stereo images of a previous frame. However, since the correlation with the stereo image of the previous frame is low in a portion with a large motion in many cases, the error concealment based on the stereo image of the previous frame may not be performed in some cases. Accordingly, the information processing system  10 - 1  performs error concealment on the criterion block based on the parallax reference block and the motion reference block. That is, the information processing system  10 - 1  performs the error concealment not only based on the stereo image of the previous frame but also based on the stereo image of the current frame. 
     Thus, the information processing system  10 - 1  according to the first embodiment determines the redundancy of the parity packet not only based on the parallax information but also based on the motion information and the camera characteristics. Accordingly, the information processing system  10 - 1  can improve the video quality. The information processing system  10 - 1  performs the error concealment not only based on the stereo image of the previous frame but also based on the stereo image of the current frame. Accordingly, the information processing system  10 - 1  can more reliably restore the stereo image. Hereinafter, the configuration of the information processing system  10 - 1  will be described in detail. 
     (1-2. Configurations of Camera and Transmission Device) 
     Next, the configurations of the cameras  20 L and  20 R and the transmission device  30  according to this embodiment will be described with reference to  FIG. 1 . The camera  20 L captures a left-eye image and transmits the left-eye image to the transmission device  30 . The camera  20 R captures a right-eye image and transmits the right-eye image to the transmission device  30 . 
     Thus, in this embodiment, stereoscopic images are perceived by the user based on videos captured by the two cameras  20 L and  20 R. However, stereoscopic video capturing can be performed with only one camera. Even a one-lens camera is applied appropriately to this embodiment, as long as right and left videos can be formed and a 3D effect can be obtained. 
     The cameras  20 L and  20 R can capture images with a large motion or images with large parallax according to the characteristics (for example, installation environments, usages, or the like). For example, when the cameras  20 L and  20 R are installed behind backboards on a basketball court, the cameras  20 L and  20 R capture images with depth such as images of a ball or a dunk, that is, images with large parallax. 
     On the other hand, when the cameras  20 L and  20 R are installed on the sides of the basketball court, the cameras  20 L and  20 R capture images in which players or the like are moving intensely, that is, images with a large motion. This is because the cameras  20 L and  20 R image shapes on the front of the goals and the players are fiercely moving to the front of the goals. That is, objects (for example, players) in the images are moving intensely in the xy directions. 
     When the cameras  20 L and  20 R are installed in the middle of the basketball court (a ceiling portion facing the basketball court), the cameras  20 L and  20 R capture images in which a motion in the x direction is intense. In this case, the cameras  20 L and  20 R capture shapes at the time of a swift attack or at the start time of the game. However, this is because players or the like are largely moving in specific directions (directions toward the opponents&#39; baskets) at the time of a swift attack or at the start time. 
     The transmission device  30  includes a 3D processing unit  31 , a video encoding unit  32 , a packet processing unit  33 , an FEC encoding unit  35 , and a transmission unit  36 . The transmission device  30  has a hardware configuration of a CPU, a ROM, a RAM, a communication device, and the like. The ROM stores a program that causes the transmission device  30  to realize the 3D processing unit  31 , the video encoding unit  32 , the packet processing unit  33 , the FEC encoding unit (encoding unit)  35 , and the transmission unit  36 . The CPU reads and executes the program stored in the ROM. Accordingly, the 3D processing unit  31 , the video encoding unit  32 , the packet processing unit  33 , the FEC encoding unit (encoding unit)  35 , and the transmission unit  36  are realized by the hardware configuration. 
     The 3D processing unit  31  performs various 3D processes (for example, calibration) necessary to display a stereo image. Thus, when the stereo image is perceived by the user, a stereoscopic video effect can be achieved. The 3D processing unit  31  outputs the stereo image subjected to the 3D processes to the video encoding unit  32 . 
     The video encoding unit  32  divides the stereo image into a plurality of blocks and compresses data of each block. Here, any shape and size of the block can be set according to allowable delay, or image quality or the like necessary for the information processing system  10 - 1 . The video encoding unit  32  outputs the compressed right-eye and left-eye images to the packet processing unit  33 . The packet processing unit  33  generates an RTP packet (original packet) for each block of the right-eye and left-eye images by performing a packetizing (RTP packetizing) process for communication. The RTP packet includes an identifier indicating which blocks are configured in the right-eye and left-eye images. 
     The packet processing unit  33  outputs the packetized right-eye and left-eye images to the FEC encoding unit  35 . The FEC encoding unit  35  performs an FEC encoding process. Briefly, the FEC encoding unit  35  extracts a criterion block from one image of the right-eye and left-eye images and extracts a parallax reference block (parallax reference packet) from the other image. Then, the FEC encoding unit  35  generates a parallax vector indicating a distance between a display position of the parallax reference block and a display position of the criterion block. Further, the FEC encoding unit  35  extracts a motion reference block (motion reference packet) corresponding to the criterion block from one frame of a previous frame and generates a motion vector indicating a distance between a display position of the motion reference block and a display position of the criterion block. Then, the FEC encoding unit  35  determines redundancy of a parity packet based on these vectors and a redundancy determination variable table illustrated in  FIG. 2 . The FEC encoding unit  35  generates a parity packet for each criterion block based on the redundancy. The parity packet includes a parity, right and left frame correlation information, and previous frame correlation information. Each piece of correlation information will be described below. 
     Here, the FEC encoding process will be described in detail. The FEC encoding process is performed in the following three steps: 
     step 1 of generating the redundancy determination variable table; 
     step 2 of calculating a motion vector and a parallax vector by pattern matching; and 
     step 3 of determining the number of parity packets to be assigned and assigning the parity packets. 
     (Generation of Redundancy Determination Variable Table) 
     First, the FEC encoding unit  35  generates the redundancy determination variable table illustrated in  FIG. 2 . The redundancy determination variable table shows a motion vector component weighting constant a, a parallax vector component weighting constant b, a motion parallax vector weighting constant a 1 , and a packet redundancy normalizing constant X. The motion vector component weighting constant (component weighting information) a indicates a weighting of each component of the motion vector. The parallax vector component weighting constant (component weighting information) b indicates a weighting of each component of the parallax vector. 
     The weight constants a and b are set based on the characteristics of the cameras  20 R and  20 L, that is, the camera characteristics. Here, the camera characteristics are information indicating the installation environments, usages, or the like of the cameras  20 R and  20 L. As described above, the cameras  20 R and  20 L capture images with a large motion vector and images with a large parallax vector according to the characteristics. Further, the components of the motion vector and the parallax vector are different according to the camera characteristics. 
     Accordingly, in this embodiment, the weighting constants a and b are set based on the characteristics of the cameras  20 R and  20 L, that is, the camera characteristics. For example, when the cameras  20 R and  20 L are installed on the sides of a basketball court, the weighting constant a is considered to be about 0.5. This is because an object in the stereo image is moving intensely in the xy directions. In a block in which the y component of the motion vector is larger, the degree of influence on the stereoscopic video effect is large. Thus, in this case, the weighting on the y component of the motion vector may be set to be large. For example, the weighting constant a may be set to be about 0.3. Thus, since the redundancy of the block with a large motion of the y component increases, the stereoscopic video effect of the stereo image can be improved (see Math. (2) to be described below). When the cameras  20 R and  20 L are installed in the middle of a basketball court, the weighting constant a considerably increases. In this case, the weighting to the y component of the motion vector considerably decreases. Thus, the redundancy of the block with a large motion of the x component increases. 
     In principle, the y component of the parallax vector is 0. When the parallax vector is deviated in the y direction due to deviation of the installation positions of the cameras, the deviation of the parallax vector causes 3D sickness or the like. Further, when the y component is extracted, there is a probability that the block matching may fail. Accordingly, in this embodiment, b=1 may be set. In this case, the y component of the parallax vector is cancelled. 
     The motion parallax vector weighting constant (motion weighting information and parallax weighting information) al indicates a weighting of the motion vector and the parallax vector. That is, in this embodiment, the weighting is performed on both the motion vector and the parallax vector. The weighting constant a 1  is also set based on the camera characteristics. That is, as described above, a case in which the cameras  20 R and  20 L capture stereo images (images in which an object is widely moving to the right or left) with a large motion is assumed, or a case in which the cameras  20 R and  20 L capture stereo images (images in which an object is widely moving to the front or rear) with large parallax is assumed. 
     Accordingly, in this embodiment, when the cameras  20 R and  20 L capture stereo images with a large motion, the value of the weighting constant a 1  is set to be small. In this case, large weighting is set to the motion vector. Thus, packet loss of a block with a large motion is easily restored. On the other hand, when the cameras  20 R and  20 L capture stereo images with large parallax, the value of the weighting constant a 1  is set to be large. In this case, large weighting is set to the parallax vector. Thus, since the stereoscopic video effect is maintained more reliably, the quality of the image is improved. The packet redundancy normalizing constant X is a constant used to normalize the redundancy to a value in the range of 0 to 1. 
     The FEC encoding unit  35  can flexibly determine the redundancy by generating the redundancy determination variable table. The FEC encoding unit  35  can generate the redundancy determination variable table when the information processing system  10 - 1  starts a process or any adjustment is performed. The FEC encoding unit  35  may determine each constant by a user&#39;s setting operation. That is, each constant may be determined in any way. However, when the characteristics (a magnitude relation with another vector and the size of each component) of each vector are determined in advance, each constant may be determined according to the camera characteristics or the like. 
     (Calculation of Motion Vector and Parallax Vector by Pattern Matching) 
     The FEC encoding unit  35  extracts a first criterion block from one image of the right-eye and left-eye images and calculates a motion vector and a parallax vector of the first criterion block. Here, when the weighting constant a 1  is set to 0, the calculation of the parallax vector can be omitted. 
     Hereinafter, a calculation example of the parallax vector and the motion vector will be described with reference to  FIG. 3 .  FIG. 3  is a diagram illustrating a first criterion block B, a parallax reference block B d , a motion reference block B m , a parallax vector d, and a motion vector m. In  FIG. 3 , it is assumed that a frame F r,t  is a right-eye image of the current frame, a frame F r,t−1  is a right-eye image of a previous frame, a frame F l,t  is a left-eye image of the current frame, and a frame F l,t−1  is a left-eye image of the previous frame. Accordingly, in this example, the right-eye image is set as the one image. 
     The FEC encoding unit  35  extracts the first criterion block B from the frame F r,t . The FEC encoding unit  35  extracts the parallax reference block B d  corresponding to the first criterion block B from the frame F l,t  by block matching or the like. The FEC encoding unit  35  extracts the motion reference block B m  corresponding to the criterion block B from the frame F r,t−1 . 
     The FEC encoding unit  35  calculates the motion vector m by Math. (1) below. The motion vector m indicates a distance between a display position of the motion reference block B m  and a display position of the first criterion block B, that is, indicates how much the first criterion block B varies temporally. 
     
       
         
           
             
               
                 
                   
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     Here, it is assumed that p is a pixel and F is a luminance value indicated by the pixel p. The motion vector m=(m x , m y ) is assumed to minimize f(m) (the sum of luminance value differences). Likewise, the FEC encoding unit  35  also calculates the parallax vector d=(dx, dy) from F l,t . The parallax vector d indicates a distance between a display position of the parallax reference block B d  and a display position of the first criterion block B, that is, indicates how much parallax the first criterion block B has. 
     The FEC encoding unit  35  calculates the parallax vectors and the motion vectors for all of the blocks of the one image. Then, the FEC encoding unit  35  extracts a second criterion block from the other image and performs the same process as the above-described process. 
     Thus, the FEC encoding unit  35  calculates the parallax vectors and the motion vectors for all of the blocks of the right-eye and left-eye images. The FEC encoding unit  35  may use the parallax vector and the motion vector of the first criterion block as the parallax vector and the motion vector of the second criterion block by associating the second criterion block with the first criterion block based on the result of the block matching described above. The parallax vector of the second criterion block has an inverse sign of the first parallax vector. Thus, a task of the calculation of the vector can be reduced. Hereinafter, the first and second criterion blocks are also collectively referred to as “criterion blocks.” 
     (Determination of Number of Parity Packets to be Assigned and Assignment of Parity Packets) 
     Next, the FEC encoding unit  35  determines the number of parity packets and assigns the parity packets. Specifically, the redundancy of each criterion block is first calculated based on the redundancy determination variable table, the parallax vector, the motion vector, and Math. (2) below. In Math. (2), P indicates the redundancy. 
     
       
         
           
             
               
                 
                   
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     The FEC encoding unit  35  generates the parity packets (error correction code (ECC) information) based on the redundancy and an amount of information (specifically, the number of original packets) of the criterion block. Specifically, the FEC encoding unit  35  determines the number of parity packets by multiplying the number of original packets by the redundancy. A value after the decimal point is considered to be rounded down, but may be rounded off or rounded up. Then, the FEC encoding unit  35  generates the parity packets by the number of parity packets and assigns the parity packets to the original packets of the criterion block. Thus, the redundancy is defined as a ratio of the parity packets to be assigned to an original packet group constituting the criterion block. Further, an amount of information per original packet and an amount of information per parity packet are assumed to be set in advance. 
     Here, the FEC encoding unit  35  causes the parity packet to include the right and left frame correlation information and the previous frame correlation information. The right and left frame correlation information includes information indicating the position of the parallax reference block corresponding to the criterion block and information (for example, the parallax vector d or a luminance value difference f(d)) indicating correlation between the criterion block and the parallax reference block. The previous frame correlation information includes information indicating the position of the parallax reference block corresponding to the criterion block and information (for example, a motion vector m or the luminance value difference f(m)) indicating correlation between the criterion block and the motion reference block. 
     An example is illustrated in  FIG. 4 . In  FIG. 4 , criterion blocks A, B, and C are extracted from the frame F r,t . In this example, when three original packets constituting the criterion block A are present and the redundancy P is 0.5, one parity packet is assigned. Likewise, when four original packets constituting the criterion block B are present and the redundancy P is 0.5, two parity packets are assigned. On the other hand, when the redundancy of the criterion block C is high (an influence on the stereoscopic video effect is high), P is set to 1.0 and three parity packets are assigned. 
     Here, the FEC encoding unit  35  can monitor a network status and determine the redundancy (limit the number of parity packets) based on a monitoring result. For example, the FEC encoding unit  35  sets the maximum bit rate when delay or jitter starts increasing and the network status becomes worse. When the current bit rate exceeds the maximum bit rate, the FEC encoding unit  35  performs control of traffic by lowering the redundancy (reducing the number of parity packets) so that the current bit rate is equal to or less than the maximum bit rate. 
     As another example of the control of traffic, a method of reducing the number of criterion blocks (that is, reducing the number of criterion blocks in which the parity packets are assigned) to be matched can be exemplified. Further, a method of reducing the throughput of the calculation of the redundancy (for example, a method of setting the redundancy to a constant when the value of the motion vector or the parallax vector is less than a predetermined value) or a method of omitting the calculation of the parallax vector or the motion vector can be exemplified. When the calculation of the parallax vector or the motion vector is omitted, for example, the component of the omitted vector is considered to be 0. 
     The FEC encoding unit  35  outputs the stereo image using the parity packets and the original packets as stereo image packets (UDP/IP packets) to the transmission unit  36 . The transmission unit  36  transmits the stereo image packets of the left-eye image and the stereo image packets of the right-eye image to the reception device  50 . 
     (1-3. Configuration of Reception Device) 
     Next, the configuration of the reception device  50  will be described with reference to  FIG. 1 . The reception device  50  includes a reception unit  51 , an FEC decoding unit (decoding unit)  52 , a packet processing unit  53 , and a video decoding unit  54 . The reception device  50  has a hardware configuration of a CPU, a ROM, a RAM, a communication device, and the like. The ROM stores a program that causes the reception device  50  to realize the reception unit  51 , the FEC decoding unit (decoding unit)  52 , the packet processing unit  53 , and the video decoding unit  54 . The CPU reads and executes the program stored in the ROM. Accordingly, the reception unit  51 , the FEC decoding unit (decoding unit)  52 , the packet processing unit  53 , and the video decoding unit  54  are realized by the hardware configuration. 
     The reception unit  51  receives the stereo image packets and outputs the stereo image packets to the FEC decoding unit  52 . When the reception unit  51  detects lost packets from original packets, the reception unit  51  notifies the FEC decoding unit  52  that the packets are lost. 
     When the FEC decoding unit  52  detects the lost packets, the FEC decoding unit  52  first attempts to restore the stereo image packets based on the parity packets. When the packets are lost beyond the allowable scope of restoration based on the parity packets, that is, restoration based on the parity packets is difficult, the FEC decoding unit  52  performs error concealment. Specifically, the FEC decoding unit  52  determines which correlation is higher between the parallax reference block and the motion reference block based on the previous frame correlation information and the right and left frame correlation information. The determination criterion is, for example, a sum f of luminance value differences. For example, when f(d)&lt;f(m), the parallax reference block has higher correlation with the criterion block than the motion reference block. Then, the FEC decoding unit  52  restores the original packets using the block with the higher correlation. For example, the FEC decoding unit  52  assumes the original packets of the block with the higher correlation as the original packets of the criterion block. Thereafter, the FEC decoding unit  52  outputs the stereo image packets to the packet processing unit  53 . 
     The packet processing unit  53  restores the stereo image packets to stream information (compressed stereo image). The video decoding unit  54  restores the stream information to the original stereo images, that is, the stereo images captured by the cameras  20 L and  20 R. The video decoding unit  54  causes the display device  60  to display the stereo images. The display device  60  can display the stereo images stereoscopically. That is, the display device  60  enables the right and left eyes of the user to perceive the right-eye image and the left-eye image, respectively. 
     &lt;1-4. Processing Order by Transmission Device&gt; 
     Next, a processing order by the transmission device  30  will be described with reference to the flowchart of  FIG. 5 . In step S 10 , the 3D processing unit  31  determines whether stereo images (video images) are input from the cameras  20 R and  20 L. When the 3D processing unit  31  determines that the stereo images are input from the cameras  20 R and  20 L, the process proceeds to step S 20 . When the 3D processing unit  31  determines that the stereo images are not input from the cameras  20 R and  20 L, the process ends. 
     In step S 20 , the 3D processing unit  31  performs various 3D processes necessary to display the stereo images. The 3D processing unit  31  outputs the right-eye and left-eye images subjected to the 3D processes to the video encoding unit  32 . 
     In step S 30 , the video encoding unit  32  performs a video encoding process. Specifically, the video encoding unit  32  divides the stereo images into a plurality of blocks and compresses data for each block. The video encoding unit  32  outputs the compressed stereo images to the packet processing unit  33 . 
     In step S 40 , the packet processing unit  33  performs the packetizing (RTP packetizing) process for communication to generate an RTP packet (original packet) for each block of the stereo images. The packet processing unit  33  outputs the packetized right-eye and left-eye images to the FEC encoding unit  35 . 
     In step S 50 , the FEC encoding unit  35  performs the FEC encoding process. Specifically, the FEC encoding unit  35  performs the above-described three steps (the generation of the redundancy determination variable table, the calculation of the motion vector and the parallax vector by the pattern matching, the determination of the number of parity packets to be assigned, and the FEC encoding process). The FEC encoding unit  35  outputs the stereo images using the parity packets and the original packets as the stereo image packets (UDP/IP packets) to the transmission unit  36 . In step S 60 , the transmission unit  36  transmits the stereo image packets to the reception device  50 . Thereafter, the transmission device  30  ends the process. 
     &lt;1-5. Processing Order by Reception Device&gt; 
     Next, a processing order by the reception device  50  will be described with reference to the flowchart of  FIG. 6 . In step S 110 , the reception unit  51  determines whether the stereo image packets are received. When the reception unit  51  determines that the stereo image packets are received, the process proceeds to step S 120 . When the reception unit  51  determines that the stereo image packets are not received, the process ends. 
     In step S 120 , when the reception unit  51  detects lost packets from the original packets, the reception unit  51  notifies the FEC decoding unit  52  that the packets are lost. When the lost packets are detected, the FEC decoding unit  52  attempts to restore the stereo image packets based on the parity packets. When the lost packets are not present, the FEC decoding unit  52  outputs the stereo image packets to the packet processing unit  53 . Thereafter, the packet processing unit  53  performs the process of step S 180 . 
     In step S 130 , the FEC decoding unit  52  determines whether the restoration based on the parity packets is performed. When the FEC decoding unit  52  determines that the restoration based on the parity packets is performed, the FEC decoding unit  52  outputs the restored stereo image packets to the packet processing unit  53  and the process proceeds to step S 180 . Conversely, when the FEC decoding unit  52  determines that the restoration based on the parity packets is not performed, the process proceeds to step S 140 . 
     In step S 140 , the FEC decoding unit  52  starts the error concealment process. Specifically, in step S 150 , the FEC decoding unit  52  determines which correlation is higher between the parallax reference block and the motion reference block based on the previous frame correlation information and the right and left frame correlation information. When the FEC decoding unit  52  determines that the correlation of the parallax reference block is higher than the correlation of the motion reference block, the process proceeds to step S 160 . Conversely, when the FEC decoding unit  52  determines that the correlation of the motion reference block is higher than the correlation of the parallax reference block, the process proceeds to step S 170 . Further, when both the correlations are equal to each other, the FEC decoding unit  52  may perform the process of any one of step S 160  and S 170 . 
     In step S 160 , the FEC decoding unit  52  restores the original packet of the criterion block using the parallax reference block. For example, the FEC decoding unit  52  sets the original packet of the parallax reference block to the original packet of the criterion block. Thereafter, the FEC decoding unit  52  outputs the stereo image packets to the packet processing unit  53  and the process proceeds to step S 180 . 
     In step S 170 , the FEC decoding unit  52  restores the original packet of the criterion block using the motion reference block. For example, the FEC decoding unit  52  sets the original packet of the motion reference block to the original packet of the criterion block. Thereafter, the FEC decoding unit  52  outputs the stereo image packets to the packet processing unit  53  and the process proceeds to step S 180 . 
     In step S 180 , the packet processing unit  53  restores the stereo image packets to the stream information (compressed stereo images). In step S 170 , the video decoding unit  54  restores the stream information to the original stereo images, that is, the stereo images captured by the cameras  20 R and  20 L. The video decoding unit  54  causes the display device  60  to display the stereo images. Thereafter, the reception device  50  ends the process. 
     In the first embodiment, as described above, the information processing system  10 - 1  can construct the stereoscopic video live transmission system tolerant of the packet loss. Since the information processing system  10 - 1  can determine each weighting constant according to the intensity of the stereoscopic video effect and the degree of influence on the video quality, the information processing system  10 - 1  can suppress the loss of the stereoscopic video effect caused in the network transmission. Even when the packet loss may not be restored based on the parity packets, the information processing system  10 - 1  can provide videos without damage to the stereoscopic video effect through an interpolation process (error concealment process). 
     That is, the information processing system  10 - 1  generates the parity packet (error correction code (ECC) information) assigned to the criterion block based on the parallax information and the motion information. Here, when the motion of the criterion block is large (an amount of movement from a previous frame is large), the criterion block may have a large influence on the stereoscopic video effect. However, the information processing system  10 - 1  can assign the parity packet according to the motion of the criterion block. Accordingly, since the information processing system  10 - 1  can assign the abundant parity packets to the criterion block with a large motion, it is possible to suppress quality deterioration caused in the network transmission of the stereo images. 
     The information processing system  10 - 1  determines the redundancy of the parity packets based on the parallax information and the motion information and generates the parity packets based on the number of original packets (an amount of information of the criterion block) and the redundancy. Thus, the information processing system  10 - 1  can assign the parity packets more reliably according to the motion of the criterion block. 
     Since the information processing system  10 - 1  determines the redundancy based on the camera characteristics, the information processing system  10 - 1  can calculate the redundancy more accurately. 
     Since the information processing system  10 - 1  determines the redundancy based on the installation environments of the cameras  20 R and  20 L, the information processing system  10 - 1  can calculate the redundancy more accurately. 
     The information processing system  10 - 1  determines the redundancy based on the motion parallax vector weighting constant a 1  (the parallax weighting information and the motion weighting information). Accordingly, the information processing system  10 - 1  can calculate the redundancy more accurately. 
     The information processing system  10 - 1  determines the redundancy based on the motion vector weighting constant a and the parallax vector weighting constant b (component weighting information). Accordingly, the information processing system  10 - 1  can calculate the redundancy more accurately. 
     Since the information processing system  10 - 1  determines the redundancy based on a network status, it is possible to prevent an excessive load from being applied to traffic. 
     Since the parallax information and the motion information for the first criterion block are used as the parallax information and the motion information for the second criterion block, the task of the calculation of the redundancy can be reduced. 
     When the restoration of the criterion block based on the parity packets is not achieved, the information processing system  10 - 1  performs the error concealment process on the criterion block based on the parallax reference block and the motion reference block. Accordingly, the information processing system  10 - 1  can restore the criterion block more reliably. 
     The information processing system  10 - 1  performs the error concealment on the criterion block based on the block with the higher correlation to the criterion block between the parallax reference block and the motion reference block. Accordingly, the information processing system  10 - 1  can restore the criterion block more reliably and accurately. 
     &lt;2. Second Embodiment&gt; 
     Next, a second embodiment will be described.  FIG. 7  is a diagram illustrating the configuration of an information processing system  10 - 2  according to the second embodiment. The information processing system  10 - 2  is different from the information processing system  10 - 1  in that n (where n is an integer equal to or greater than 3) cameras  20 - 1  to  20 -n are connected to a transmission device  30  via a switcher  70  and a network (IP network)  25 . 
     The cameras  20 - 1  to  20 -n generate captured images by performing imaging. A camera ID used to uniquely specify the camera generating a captured image is assigned to the captured image. The cameras  20 - 1  to  20 -n transmit the captured images to the switcher  70 . The cameras  20 - 1  to  20 -n form pairs of cameras. Of the cameras forming a pair of cameras, one camera captures a right-eye image and the other camera captures a left-eye image. One camera can be included in a plurality of pairs of cameras in some cases. In this case, a given camera may capture a right-eye image in one pair of cameras and capture a left-eye image in another pair of cameras in some cases. 
     The switcher  70  stores a 3D target camera video ID pair (Rid, Lid). The 3D target camera video ID pair is constituted by a right-eye camera ID (Rid) and a left-eye camera ID (Lid). The right-eye camera ID indicates the camera ID of a camera capturing a right-eye image and the left-eye camera ID indicates the camera ID of a camera capturing a left-eye image. 
     The switcher  70  classifies the captured images into the right-eye image and the left-eye image based on the 3D target camera video ID pair and the camera ID assigned to each captured image. The switcher  70  assigns a flag indicating a right-eye image to the right-eye image and assigns a flag indicating a left-eye image to the left-eye image. The switcher  70  generates the stereo images formed from the right-eye and left-eye images and outputs the stereo images to the transmission device  30 . 
     The transmission device  30  has the same configuration as that of the first embodiment and performs the same process as that of the first embodiment. However, the structure of a redundancy determination variable table  34  is different from that of the first embodiment.  FIG. 8  is a diagram illustrating an example of the redundancy determination variable table  34  according to the second embodiment. As illustrated in  FIG. 8 , in the redundancy determination variable table  34  according to the second embodiment, an item of “3D target camera video ID pair” is added to the redundancy determination variable table  34  according to the first embodiment. That is, the information processing system  10 - 2  includes the redundancy determination variable table  34  for each 3D target camera video ID pair. This is because the camera characteristics are different for each 3D target camera video ID pair in some cases. Of course, when the camera characteristics are common in the plurality of 3D target camera video ID pairs, the redundancy determination variable table  34  may be commonly used in the 3D target camera video ID pairs. The FEC encoding unit  35  selects the redundancy determination variable table  34  based on the camera ID pair assigned to the stereo image and performs the same process as that of the first embodiment based on the selected redundancy determination variable table  34 . 
     Even in the second embodiment, the same advantages as those of the first embodiment can be obtained. In the second embodiment, the information processing system  10 - 2  can set a different redundancy for the characteristics of each pair of cameras. 
     The switcher  70  may perform some of the processes of the transmission device  30 , particularly, the processes of the 3D processing unit  31 , the video encoding unit  32 , and the packet processing unit  33 . The switcher  70  may be included in the transmission device  30 . 
     &lt;Embodiment&gt; 
     Next, an embodiment will be described with reference to  FIG. 9 . In the embodiment, as illustrated in  FIG. 9 , live 3D video delivery of a basketball using a plurality of cameras A to G will be described. In the example, seven cameras A to G are installed and are each connected to an IP network. That is, in this embodiment, the information processing system  10 - 2  according to the second embodiment is used. 
     In the embodiment, a pair of cameras A and B, a pair of cameras C and D, a pair of cameras E and F, and a pair of cameras F and G are configured. The camera F captures a right-eye image in the pair of cameras E and F and captures a left-eye image in the pair of cameras F and G. 
     The pair of cameras A and B are installed behind a backboard, and thus have camera characteristics in which images with depth such as images of a ball or a dunk are captured. Thus, the FEC encoding unit  35  preferentially assigns the parity packets to packets constituting a criterion block with a large parallax vector by increasing the weighting constant a 1 . 
     On the other hand, the pair of cameras C and D are installed on a side of a basketball court, and thus have camera characteristics in which images of the entire court are captured. An amount of exercise of players captured by the pair of cameras C and D is the largest (that is, objects (players) in the captured images are moving intensely in the xy directions). Therefore, the FEC encoding unit  35  preferentially assigns the parity packets to packets constituting a criterion block with a large exercise amount vector by decreasing the weighting constant a 1 . The FEC encoding unit  35  may increase the weighting to the y component of the motion vector by decreasing the weighting constant a. 
     On the other hand, the pair of cameras E and F and the pair of cameras F and G are installed in the middle of the basketball court (a ceiling portion facing the middle of the basketball court), and thus have camera characteristics in which images of shapes at the beginning of the game, during a fast play, or the like are captured. That is, there is a probability that the pair of cameras E and F and the pair of cameras F and G capture images with a large motion and images with depth. Therefore, the FEC encoding unit  35  sets the weighting constant a 1  to 0. The FEC encoding unit  35  increases the redundancy of a criterion block in which a lateral movement is intense by decreasing the weighting of the y component of the motion vector (that is, increasing the weighting constant a). Thus, when the camera characteristics (that is, the positions, situations, or the like of the cameras) are determined in advance, the information processing system  10 - 2  can perform the weighting appropriately so that the image deterioration caused due to packet loss in the network can be prevented. 
     The preferred embodiments of the present disclosure have been described in detail with reference to the appended drawings, but the present disclosure is not limited thereto. It should be apparent to those skilled in the art that various modifications or corrections can be made within the scope of the technical spirit and essence described in the claims and are, of course, construed to pertain to the technical scope of the present disclosure. 
     The present technology may also assume the following configurations. 
     (1) A system, comprising: 
     at least one processor configured to perform: 
     accessing parallax information for a first portion of a first image, the parallax information calculated based on a second image associated with the first image; 
     accessing motion information for the first portion of the first image, the motion information calculated based on a third image captured at a different time than the first image; and 
     generating error correction information for the first portion of the first image based on the parallax information and the motion information. 
     (2) The system of (1), wherein the at least one processor is further configured to encode the first portion based on the generated error correction information to obtain a first encoded portion. 
     (3) The system of (2), wherein the at least one processor is further configured to transmit the first encoded portion and the generated error correction information to another system. 
     (4) The system of (1), wherein the at least one processor is further configured to calculate the parallax information for the first portion of the first image. 
     (5) The system of (1), wherein the at least one processor is further configured to calculate the motion information for the first portion of the first image. 
     (6) The system of (1), wherein generating the error correction information for the first portion comprises: 
     generating error correction information having a large redundancy when the parallax information indicates that the first portion has large parallax. 
     (7) The system of (1), wherein generating the error correction information for the first portion comprises: 
     generating error correction information having a large redundancy when the motion information is indicative of a large amount of motion. 
     (8) The system of (1), wherein the first image is obtained by a first camera, and wherein the at least one processor is configured to perform generating error correction information based on information associated with the first camera. 
     (9) The system of (8), wherein information associated with the first camera comprises information about an environment in which the first camera obtained the first image. 
     (10) The system of (1), wherein the first image is obtained at a first view point, and wherein generating the error correction information for the first portion comprises weighting the parallax information and the motion information based on information associated with the first view point. 
     (11) The system of (1), further comprising a 3D processing unit configured to calculate a stereo image based on the first image and the second image. 
     (12) The system of (1), wherein the error correction information comprises error correction code (ECC) information. 
     (13) The system of (1), wherein the first image is obtained at a first view point and wherein the second image is obtained at a second view point different from the first view point. 
     (14) The system of (13), wherein the third image is obtained at the first view point. 
     (15) The system of (4), wherein the parallax information is calculated based on a distance between a display position of the first portion and a display position of a second portion of the second image corresponding to the first portion. 
     (16) The system of (5), wherein the motion information is calculated based on a distance between a display position of the first portion and a display position of a third portion of the third image corresponding to the first portion. 
     (17) A system, comprising: 
     a first system, comprising at least one processor configured to perform: 
     accessing parallax information for a first portion of a first image, the parallax information calculated based on a second image associated with the first image; accessing motion information for the first portion of the first image, the motion information calculated based on a third image captured at a different time than the first image; and 
     generating error correction information for the first portion of the first image based on the parallax information and the motion information; 
     encoding the first portion of the first image based at least in part on the error correction information to obtain a first encoded portion; and 
     transmitting the first encoded portion and the error correction information to a second system; and 
     the second system, configured to perform acts of: 
     receiving the first encoded portion and the generated error correction information from the first system; and 
     decoding the first encoded portion to obtain a first decoded 
     portion. 
     (18) The system of (17), wherein the second system is further configured to perform error concealment on the first decoded portion based on the error correction information. 
     (19) A method, comprising: 
     accessing parallax information for a first portion of a first image, the parallax information calculated based on a second image associated with the first image; 
     accessing motion information for the first portion of the first image, the motion information calculated based on a third image captured at a different time than the first image; and 
     generating error correction information for the first portion of the first image based on the parallax information and the motion information. 
     (20) A memory storing a program that, when executed by at least one processor, causes the at least one processor to perform: 
     accessing parallax information for a first portion of a first image, the parallax information calculated based on a second image associated with the first image; 
     accessing motion information for the first portion of the first image, the motion information calculated based on a third image captured at a different time than the first image; and 
     generating error correction information for the first portion of the first image based on the parallax information and the motion information. 
     (21) A system, comprising: 
     at least one processor configured to perform: 
     accessing parallax information for a first portion of a first image, the parallax information calculated based on a second image associated with the first image; accessing motion information for the first portion of the first image, the motion information calculated based on a third image captured at different time than the first image; and 
     executing error concealment processing for the first portion of the first image based on the parallax information and the motion information. 
     (22) The system of (21), wherein the at least one processor is further configured to: access error correction information for the first portion of the first image, the error correction information generated by another system based on the parallax information and the motion information, and 
     execute error concealment processing when restoration processing of the first portion of the first image based on the error correction information is not performed. 
     (23) A method, comprising: 
     accessing parallax information for a first portion of a first image, the parallax information calculated based on a second image associated with the first image; 
     accessing motion information for the first portion of the first image, the motion information calculated based on a third image captured at a different time from the first image; and 
     executing error concealment processing for the first portion of the first 
     image based on the parallax information and the motion information. 
     (24) A memory storing a program that, when executed by at least one processor, causes the at least one processor to perform: 
     accessing parallax information for a first portion of a first image, the parallax information calculated based on a second image associated with the first image; 
     accessing motion information for the first portion of the first image, the motion information calculated based on a third image captured at a different time from the first image; and 
     executing error concealment processing for the first portion of the first image based on the parallax information and the motion information. 
     (25) An information processing device including: 
     an encoding unit that extracts a criterion block from one image of right-eye and left-eye images, extracts a parallax reference block corresponding to the criterion block from the other image, and generates parallax information indicating a distance between a display position of the parallax reference block and a display position of the criterion block, 
     extracts a motion reference block corresponding to the criterion block from the one image of a previous frame and generates motion information indicating a distance between a display position of the motion reference block and the display position of the criterion block, and 
     generates error correction code (ECC) information to be assigned to the criterion block based on the parallax information and the motion information. 
     (26) The information processing device according to (25), wherein the encoding unit determines redundancy of the error correction code (ECC) information based on the parallax information and the motion information and generates the error correction code (ECC) information based on an amount of information of the criterion block and the redundancy. 
     (27) The information processing device according to (26), 
     wherein the right-eye and left-eye images are images captured by an imaging device, and 
     wherein the encoding unit determines the redundancy based on characteristics of the imaging device. 
     (28) The information processing device according to (27), wherein the encoding unit determines the redundancy based on an installation environment of the imaging device. 
     (29) The information processing device according to any one of (26) to (28), wherein the encoding unit determines the redundancy based on parallax weighting information used to weight the parallax information and motion weighting information used to weight the motion information. 
     (30) The information processing device according to any one of (26) to (29), wherein the encoding unit determines the redundancy based on component weighting information used to weight components of the parallax information and the motion information. 
     (31) The information processing device according to any one of (26) to (30), wherein the encoding unit determines the redundancy based on a network status. 
     (32) The information processing device according to any one of (25) to (31), 
     wherein the encoding unit extracts a first criterion block from one image of the right-eye and left-eye images, extracts a parallax reference block corresponding to the first criterion block from the other image, and generates parallax information indicating a distance between the display position of the parallax reference block and a display position of the first criterion block, 
     extracts a motion reference block corresponding to the first criterion block from the one image of a previous frame and generates motion information indicating a distance between a display position of the motion reference block and the display position of the first criterion block, 
     generates error correction code (ECC) information to be assigned to the first criterion block based on the parallax information and the motion information, and extracts a second criterion block from the other image and generates error correction code (ECC) information to be assigned to the second criterion block by using the parallax information and the motion information for the first criterion block as parallax information and motion information for the second criterion block. 
     (33) An information processing device including: 
     a reception unit that receives error correction code (ECC) information from another information processing device that extracts a criterion block from one image of right-eye and left-eye images, extracts a parallax reference block corresponding to the criterion block from the other image, generates parallax information indicating a distance between a display position of the parallax reference block and a display position of the criterion block, extracts a motion reference block corresponding to the criterion block from the one image of a previous frame, generates motion information indicating a distance between a display position of the motion reference block and the display position of the criterion block, and generates the error correction code (ECC) information to be assigned to the criterion block based on the parallax information and the motion information; and 
     a decoding unit that performs an error concealment process on the criterion block based on the parallax reference block and the motion reference block, when restoration of the criterion block based on the error correction code (ECC) information is not performed. 
     (34) The information processing device according to (33), wherein the decoding unit performs the error concealment on the criterion block based on the block with higher correlation to the criterion block between the parallax reference block and the motion reference block. 
     (35) An information processing method including: 
     extracting a criterion block from one image of right-eye and left-eye images, extracting a parallax reference block corresponding to the criterion block from the other image, and generating parallax information indicating a distance between a display position of the parallax reference block and a display position of the criterion block, 
     extracting a motion reference block corresponding to the criterion block from the one image of a previous frame and generating motion information indicating a distance between a display position of the motion reference block and the display position of the criterion block, and 
     generating error correction code (ECC) information to be assigned to the criterion block based on the parallax information and the motion information. 
     (36) An information processing method including: 
     receiving error correction code (ECC) information from another information processing device that extracts a criterion block from one image of right-eye and left-eye images, extracts a parallax reference block corresponding to the criterion block from the other image, generates parallax information indicating a distance between a display position of the parallax reference block and a display position of the criterion block, extracts a motion reference block corresponding to the criterion block from the one image of a previous frame, generates motion information indicating a distance between a display position of the motion reference block and the display position of the criterion block, and generates the error correction code (ECC) information to be assigned to the criterion block based on the parallax information and the motion information; and 
     performing an error concealment process on the criterion block based on the parallax reference block and the motion reference block when restoration of the criterion block based on the error correction code (ECC) information is not performed. 
     (37) A program causing a computer to realize an encoding function of: 
     extracting a criterion block from one image of right-eye and left-eye images, extracting a parallax reference block corresponding to the criterion block from the other image, and generating parallax information indicating a distance between a display position of the parallax reference block and a display position of the criterion block, 
     extracting a motion reference block corresponding to the criterion block from the one image of a previous frame and generating motion information indicating a distance between a display position of the motion reference block and the display position of the criterion block, and 
     generating error correction code (ECC) information to be assigned to the criterion block based on the parallax information and the motion information. 
     (38) A program causing a computer to realize: 
     a reception function of receiving error correction code (ECC) information from another information processing device that extracts a criterion block from one image of right-eye and left-eye images, extracts a parallax reference block corresponding to the criterion block from the other image, generates parallax information indicating a distance between a display position of the parallax reference block and a display position of the criterion block, extracts a motion reference block corresponding to the criterion block from the one image of a previous frame, generates motion information indicating a distance between a display position of the motion reference block and the display position of the criterion block, and generates the error correction code (ECC) information to be assigned to the criterion block based on the parallax information and the motion information; and 
     a decoding function of performing an error concealment process on the criterion block based on the parallax reference block and the motion reference block when restoration of the criterion block based on the error correction code (ECC) information is not performed. 
     Some embodiments may comprise a non-transitory computer readable storage medium (or multiple computer readable media) (e.g., a computer memory, one or more floppy discs, compact discs (CD), optical discs, digital video disks (DVD), magnetic tapes, flash memories, circuit configurations in Field Programmable Gate Arrays or other semiconductor devices, or other tangible computer storage media) encoded with one or more programs (e.g., a plurality of processor-executable instructions) that, when executed on one or more computers or other processors, perform methods that implement the various embodiments discussed above. As is apparent from the foregoing examples, a non-transitory computer-readable storage medium may retain information for a sufficient time to provide computer executable instructions in a non-transitory form. 
     It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and alterations may occur depending on design requirements and other factors insofar as they are within the scope of the appended claims or the equivalents thereof. 
     Use of ordinal terms such as “first,” “second,” “third,” etc., in the claims to modify a claim element does not by itself connote any priority, precedence, or order of one claim element over another or the temporal order in which acts of a method are performed. Such ordinal terms are used merely as labels to distinguish one claim element having a certain name from another element having a same name (but for use of the ordinal term) to distinguish the claim elements. 
     Also, the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having,” “containing,” “involving,” and variations thereof herein, is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. 
     REFERENCE SIGNS LIST 
       20 R,  20 L Camera 
       30  Transmission device 
       31  3D processing unit 
       32  Video encoding unit 
       33  Packet processing unit 
       34  Redundancy determination variable table 
       35  FEC encoding unit 
       36  Transmission unit 
       40  Network 
       50  Reception device 
       51  Reception unit 
       52  FEC decoding unit 
       53  Packet processing unit 
       54  Video decoding unit 
       60  Display device