Method, computer system, and computer program for inter-layer alignment in encoded video streams

Abstract

To provide a method, computer program and computer system for alignment across layers in an encoded video stream.SOLUTION: A video bitstream having multiple layers is decoded. One or more subpicture regions are identified among the multiple layers of the decoded video bitstream, the subpicture regions including a background region and one or more foreground subpicture regions. An enhanced subpicture is decoded and displayed based on a determination that a foreground subpicture region is selected. The background region is decoded and displayed based on a determination that a foreground subpicture region was not selected.SELECTED DRAWING: Figure 13

Claims

1. A method for video coding that is executed by at least one processor, The steps include: analyzing the bitstream associated with the coded video data, The steps include determining whether the picture order count value increases uniformly for each access unit based on the value of a first syntax element in the video parameter set (VPS), Based on the determination that the picture order count value increases uniformly for each access unit, the step of determining the access unit count for each access unit by dividing the picture order count value by the picture order count cycle access unit value, Based on the determination that the picture order count value does not increase uniformly for each access unit, the step of determining the access unit count for each access unit by dividing the picture order count value by the slice picture order count cycle access unit value, The steps include: decoding the coded video data based on the access unit count; A method of having.

2. The method according to claim 1, wherein the picture order count cycle access unit value is signaled within the VPS.

3. The method according to claim 1, wherein the slice picture order count cycle access unit value is signaled within the slice header.

4. The method according to claim 1, wherein when the picture order count value increases uniformly for each access unit, the slice picture order count cycle access unit value is not explicitly signaled in the coded video data.

5. The method according to claim 1, wherein when the picture order count value does not increase uniformly for each access unit, the VPS access unit count value is not explicitly signaled in the coded video data.

6. The method according to claim 1, wherein each picture within the same access unit has the same time identifier.

7. The method according to claim 6, wherein each picture within the same access unit is associated with the same time sublayer.

8. The method according to claim 1, wherein one or more pictures within the same access unit have different spatial layer identifiers.

9. The method according to claim 1, wherein at least a subset of pictures associated with the same access unit are decoded in parallel and output in the same time instance.

10. A computer system for video coding, One or more memory locations containing computer programs, One or more processors, It has, The computer program causes one or more processors to execute the method according to any one of claims 1 to 9. Computer system.

11. A computer program that causes a computer to perform the method described in any one of claims 1 to 9.

Images