Reference Picture List Reordering for Inter-View Coding Efficiency
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Solution Overview
Problem
The existing H.264/MPEG-4 AVC Multiview Video Coding (MVC) standard requires signaling a reference index for each block in a view component, leading to increased bit usage due to large index values, particularly for inter-view reference pictures, which reduces coding efficiency.
Innovation Solution
The proposed decoding method modifies the reference picture list to place the inter-view reference picture at the beginning, reducing the value of the reference index and thereby reducing the bit amount needed for coding, by writing a reference list modification syntax into the slice header and modifying the reference picture list so that the inter-view reference picture is indicated by a smaller index value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the reference index is signaled for each block using the conventional reference picture list ordering, then the inter-view reference picture can be correctly identified, but the index value becomes large requiring more bits for coding
Solution Approach 1:
The patent inverts the conventional ordering approach by placing inter-view reference pictures at the beginning of the reference picture list instead of at the end. This inversion causes frequently used inter-view reference pictures to be assigned smaller index values, reducing the bit amount required for signaling while maintaining correct identification accuracy.
Solution Approach 2:
The patent changes the ordering parameter of the reference picture list to prioritize inter-view reference pictures. By modifying the list structure and repositioning elements, the index values for important reference pictures are optimized to require fewer bits for encoding, directly addressing the bit amount issue.
2Productivity
If inter-view prediction is used for compression, then coding efficiency is improved, but the reference index values become large increasing the signaling overhead
Solution Approach 1:
The patent applies inversion by reversing the conventional reference picture list ordering to place inter-view reference pictures first. This allows inter-view prediction to continue functioning effectively for compression while simultaneously reducing the index values and associated signaling overhead.
Solution Approach 2:
The patent performs preliminary reordering of the reference picture list during the decoding initialization phase. By pre-positioning inter-view reference pictures at the beginning of the list before actual prediction operations, the system ensures that subsequent inter-view prediction operations use optimized small index values, reducing overall signaling overhead.
Data Source
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AI summary
Provided is a coding method that allows reduction of a code amount necessary for coding reference indexes and improvement in the coding efficiency. The coding method according to the present invention is a method of coding a random accessible picture using inter-view reference, and includes: writing, into a slice header of the random accessible picture, a reference list modification syntax for modifying a reference picture list so that an inter-view reference picture is placed at the beginning of the reference picture list (S103); placing the inter-view reference picture at the beginning of the reference picture list (S104); and coding a current slice included in the random accessible picture, using the reference picture list (S105).