Image decoding device, image coding device, and predicted image generation device
In DBBP, there is a problem because of a large processing amount of a synthesis process in which two complement images are synthesized according to segmentation and a filtering process is executed. A predicted image generation device includes a segmentation derivation section that derives segmentation information from an image; and an image synthesis section that generates a predicted image. The image synthesis section executes a filtering process based on a partition mode and the segmentation information.
1. A predicted image generation device comprising:
a segmentation section that derives segmentation information of a target block; and
an image synthesis section that generates a predicted image using the segmentation information,
wherein the image synthesis section generates the predicted image by using a target pixel c, a pixel l located on a left side of the target pixel and a pixel r located on a right side of the target pixel in a case that a partition mode is a vertically long block and by using the target pixel c, a pixel t located on a top side of the target pixel and a pixel b located on a bottom side of the target pixel in a case that the partition mode is a horizontally long block.
2. The predicted image generation device according to claim 1 ,
wherein the image synthesis section generates the predicted image by using a value obtained by left shifting the target pixel c by 1 bit.
3. An image decoding device comprising:
the predicted image generation device according to claim 1 ; and
a Depth-based Block Partitioning (DBBP) flag decoding section,
wherein the predicted image generation device executes DBBP prediction in a case that a DBBP flag is 1.
4. An image coding device comprising:
the predicted image generation device according to claim 1 ; and
a Depth-based Block Partitioning (DBBP) flag coding section,
wherein the predicted image generation device executes DBBP prediction in a case that a DBBP flag is 1.
5. The predicted image generation device according to claim 1 , wherein the vertically long block is indicated by N×2N and the horizontally long block is indicated by 2N×N.