Intra Prediction Mode Signaling for Video Compression
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Solution Overview
Problem
The existing methods for encoding and decoding digital video signals face inefficiencies due to the increasing number of intra prediction modes, which results in longer binary codewords and larger data sizes, making compression less efficient.
Innovation Solution
The method identifies the intra prediction mode for a current prediction block by referencing neighboring blocks, grouping available modes, or using offset values from previously identified modes, reducing the need for unique codewords and minimizing binary codeword length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of intra prediction modes is increased to improve prediction accuracy, then the prediction precision is improved, but the length of binary codewords increases and compression efficiency deteriorates
Solution Approach 1:
The patent segments the set of available intra prediction modes into multiple groups. Instead of encoding each mode individually with its own unique codeword, the encoder first signals which group contains the actual prediction mode, then signals the specific mode within that group. This hierarchical segmentation reduces the total number of bits required compared to assigning unique codewords to all modes.
Solution Approach 2:
The patent introduces a two-dimensional encoding structure: the first dimension represents the group index and the second dimension represents the mode index within the group. This dimensional transformation allows the system to efficiently represent a large number of prediction modes using a compact two-stage codeword structure, thereby improving compression efficiency while maintaining access to diverse prediction options.
2Reliability
If unique codewords are assigned to each intra prediction mode to ensure accurate identification, then the reliability of mode identification is improved, but the binary codeword length increases and data size grows
Solution Approach 1:
The patent divides the codeword structure into two segments: a group index portion and a mode index portion within the group. This segmentation allows the system to maintain reliable mode identification through a two-stage process while keeping each segment's length manageable, thereby reducing the total codeword length compared to using a single long unique codeword for each mode.
Solution Approach 2:
The patent implements a nested codeword structure where the mode index is nested within the group index framework. The group index identifies which subset of modes is active, and the nested mode index identifies the specific mode within that subset. This nested structure ensures reliable identification through hierarchical verification while minimizing the total number of bits required.
Data Source
AI summary
A method and apparatus for signaling and receiving a video signal for processing is disclosed. Methods for determining a most probable mode for predicting a current prediction block are provided as well as new methods for grouping intra prediction modes into prediction groups. Methods for predicting a prediction block of video data as well as signaling intra prediction modes are also provided.