Position-Based Intra Mode Derivation in Reduced Secondary Video Transforms
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Solution Overview
Problem
Existing video coding standards face challenges in efficiently compressing high-resolution video due to increased bandwidth demands and complexity, particularly in handling intra prediction modes and transform coding for chroma and luma blocks.
Innovation Solution
The method involves determining a default intra prediction mode for video blocks without extrapolating neighboring pixels, applying specific rules for chroma and luma blocks, and utilizing secondary transforms based on coding modes to enhance compression efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional intra prediction modes with neighboring pixel extrapolation are used, then prediction accuracy is improved, but computational complexity and bandwidth requirements increase
Solution Approach 1:
The patent extracts and removes the extrapolation step from the traditional intra prediction process. By determining a default intra prediction mode without extrapolating neighboring pixels, the method eliminates unnecessary computational steps while maintaining prediction effectiveness, directly reducing computational complexity
Solution Approach 2:
The patent changes the parameter of intra prediction mode determination by introducing position-based mode derivation for reduced secondary transforms. This parameter change allows the system to select appropriate prediction modes based on block position and size, optimizing the balance between prediction accuracy and computational complexity for different video regions
2Measurement precision
If high-resolution video processing is performed with detailed transform coding, then video quality is improved, but bandwidth requirements increase
Solution Approach 1:
The patent applies segmentation by dividing the video processing into distinct components: luma block processing, chroma block processing, and secondary transform operations. Each component is optimized independently with specific rules for mode determination, allowing efficient compression while maintaining overall video quality
Solution Approach 2:
The patent implements partial action by applying reduced secondary transforms selectively based on coding mode and block position. Instead of applying full transform coding to all blocks, the method applies transforms only where necessary to maintain quality, reducing overall bandwidth requirements while preserving essential video information
3Productivity
If chroma and luma blocks are processed with separate detailed rules, then compression performance is improved, but processing complexity increases
Solution Approach 1:
The patent establishes universal rules that govern both luma and chroma block processing. The same position-based mode derivation and reduced secondary transform logic apply to both color components, creating a unified processing framework that simplifies implementation while maintaining optimized compression performance for each block type
Data Source
AI summary
A method of video processing is described. The method includes determining, for a conversion between a current video block of a video unit of a video and a coded representation of the video, a default intra prediction mode for the video unit coded using a certain intra prediction mode such that a prediction block of the current video block is generated without extrapolating neighboring pixels of the current video block along a direction; and performing the conversion based on the determining.