Inter-layer Prediction Type Signaling in MV-HEVC
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Solution Overview
Problem
In multi-layer video coding, the existing techniques face inefficiencies in signaling inter-layer dependency types, leading to increased overhead due to the need to code multiple instances of dependency type syntax elements, especially in bitstreams with a large number of layers.
Innovation Solution
The proposed solution involves signaling a single syntax element to indicate whether the dependency type for each layer combination is signaled, allowing the decoder to assume a predetermined type if not explicitly signaled, thereby reducing the need for multiple instances of dependency type syntax elements and minimizing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dependency type syntax elements are coded for each layer combination, then the inter-layer prediction accuracy is improved, but the signaling overhead increases
Solution Approach 1:
The patent merges the dependency type information for multiple layer combinations into a single syntax element. Instead of coding separate dependency type syntax elements for each layer combination, the encoder signals one syntax element that represents the dependency type for all layer combinations, thereby reducing signaling overhead while maintaining prediction accuracy
Solution Approach 2:
The single syntax element serves multiple functions by indicating the dependency type for all layer combinations simultaneously. This universal syntax element allows the decoder to determine the inter-layer prediction type for any layer combination without requiring separate signaling, thus reducing overall signaling overhead
2Manufacturing precision
If multiple instances of dependency type syntax elements are signaled, then the coding precision for each layer is improved, but the bitstream complexity increases
Solution Approach 1:
The patent combines multiple dependency type syntax elements into a single syntax element in the bitstream. This merging reduces bitstream complexity by eliminating redundant signaling while preserving the necessary coding precision through the unified syntax element that applies to all layer combinations
3Measurement precision
If dependency type syntax elements are signaled for all layer combinations, then the decoding accuracy is improved, but the processing time increases
Solution Approach 1:
The patent merges dependency type information for all layer combinations into a single syntax element, allowing the decoder to determine inter-layer prediction types for all layers simultaneously. This reduces processing time by avoiding multiple separate syntax element interpretations while maintaining decoding accuracy through the unified dependency type information
Data Source
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AI summary
A video decoder receives a value for a first syntax element representing whether a dependency type syntax element for a current layer is signaled, wherein the dependency type syntax element identifies a type of dependency of a current layer relative to a reference layer; and in response to the value for the first syntax element indicating that the dependency type syntax element is not signaled determines that the type of dependency of the current layer relative to the reference layer is a predetermined type and decodes a block of the current layer using inter-layer prediction conforming to the predetermined type.