Method and device for encoding a depth map of multi viewpoint video data, and method and device for decoding the encoded depth map

An apparatus for encoding a depth map of multi-view video data, the apparatus comprising:

• an image obtainer which is configured to obtain a multi-view color video frame and a depth map frame corresponding to the multi-view color video frame;
• a color video frame encoder which is configured to prediction-encode the obtained multi-view color video frame;
• a restorer which is configured to restore the encoded color video frame;
• a splitter which is configured to split a block of the restored multi-view color video frame into at least one partition based on a pixel value of the block of the restored multi-view color video frame;
• a correlation parameter obtainer which is configured to obtain a parameter indicating a correlation between each of block partitions of the multi-view color video frame and each of block partitions of the depth map frame by using peripheral pixel values of the block partitions of the multi-view color video frame and peripheral pixel values of the block partitions of the depth map frame corresponding to the block partitions of the multi-view color video frame with respect to each of the block partitions of the restored multi-view color video frame;
• and
• a depth map frame predictor which is configured to obtain prediction values of the corresponding block partitions of the depth map frame from the block partitions of the restored multi-view color video frame by using the obtained parameter.

A method of decoding a depth map of multi-view video data, the method comprising:

• receiving a bitstream obtained by encoding a multi-view color video frame and a depth map frame corresponding to the multi-view color video frame;
• decoding the multi-view color video frame;
• splitting a block of the decoded multi-view color video frame into at least one partition based on a pixel value of the block of the decoded multi-view color video frame;
• obtaining a parameter indicating a correlation between each of block partitions of the multi-view color video frame and each of block partitions of the depth map frame by using peripheral pixel values of the block partitions of the multi-view color video frame and peripheral pixel values of the block partitions of the depth map frame corresponding to the block partitions of the multi-view color video frame with respect to each of the block partitions of the decoded multi-view color video frame;
• and
• obtaining prediction values of the corresponding block partitions of the depth map frame from the block partitions of the decoded multi-view color video frame by using the obtained parameter.

An apparatus for decoding a depth map of multi-view video data, the apparatus comprising:

• a receiver which is configured to receive a bitstream obtained by encoding a multi-view color video frame and a depth map frame corresponding to the multi-view color video frame;
• a color video frame decoder which is configured to decode the encoded multi-view color video frame obtained from the bitstream;
• a splitter which is configured to split a block of the decoded multi-view color video frame into at least one partition based on a pixel value of the block of the decoded multi-view color video frame;
• a correlation parameter obtainer which is configured to obtain a parameter indicating a correlation between each of block partitions of the multi-view color video frame and each of block partitions of the depth map frame by using peripheral pixel values of the block partitions of the multi-view color video frame and peripheral pixel values of the block partitions of the depth map frame corresponding to the block partitions of the multi-view color video frame with respect to each of the block partitions of the decoded multi-view color video frame;
• and
• a depth map decoder which is configured to obtain prediction values of the corresponding block partitions of the depth map frame from the block partitions of the decoded multi-view color video frame by using the obtained parameter.