Intra Prediction Codeword Segmentation for Video Compression
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Solution Overview
Problem
Current intra prediction modes in video compression require longer binary codewords to identify new modes, increasing the amount of digital information needed for transmission, which decreases compression efficiency.
Innovation Solution
Introducing new angular prediction modes that reference two reconstructed samples from neighboring blocks, an enhanced angular intra prediction mode allowing previously unavailable samples to be used, and a combined intra prediction mode that combines weighted local means with angular predictions, along with a method to reorder prediction processing based on intra prediction modes, to reduce the length of codewords needed for signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If new intra prediction modes are added to improve prediction accuracy, then prediction accuracy is improved, but the maximum binary codeword length increases leading to decreased compression efficiency
Solution Approach 1:
The patent segments the intra prediction mode identification into two parts: a base codeword that identifies the prediction mode category, and an optional offset value that provides additional precision when needed. This segmentation allows the system to use shorter codewords for common cases while maintaining the ability to represent all prediction modes accurately.
Solution Approach 2:
The patent implements dynamic codeword length adjustment where the actual codeword length varies based on the specific prediction mode being used. Frequently used modes use shorter codewords, while less common modes use longer codewords with offset values. This dynamic approach optimizes the average codeword length while maintaining support for all prediction modes.
2Measurement precision
If more intra prediction modes are available to improve spatial prediction, then prediction accuracy is improved, but the number of bits required for signaling increases
Solution Approach 1:
The patent applies local quality by using different codeword representations for different prediction mode categories. Angular prediction modes use one representation format, while non-angular modes use another. This allows each category to be optimized independently, reducing the overall bit requirement compared to a uniform coding scheme.
Solution Approach 2:
The patent merges multiple prediction mode identification schemes into a unified framework that combines base mode identification with optional offset values. This merging allows the system to efficiently represent both the category of prediction mode and the specific variant within that category using a compact combined code.
Data Source
AI summary
New intra angular prediction modes and methods for decoding are offered for providing greater accuracy when processing predictions of digital video data blocks. One new method considers predicting a current prediction sample by taking the linear interpolation of two previously reconstructed reference samples that lay along a common angular line. Another new method offers a method for making previously unavailable samples from a neighboring block available as reference samples when predicting a current prediction sample. Another new method considers a new combined intra prediction mode that utilizes a local mean to predict a current prediction sample. And a new decoding method offers to rearrange the order in which video data blocks are predicted based on the intra prediction mode used for predicting the video data blocks.