Unified Luma Chroma Intra Prediction Coding for Video Compression
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Solution Overview
Problem
The existing MPEG-4 AVC/H.264 picture coding and decoding technologies face inefficiencies in processing intra predictions for luma and chroma signals, particularly when the chroma format is 4:2:0, 4:2:2, or 4:4:4, leading to degraded processing efficiency due to the need to code and decode intra prediction modes separately for luma and chroma signals.
Innovation Solution
A picture coding and decoding technology that performs intra predictions for luma and chroma signals in units of blocks, using a luma signal intra prediction unit and a chroma signal intra prediction unit to predict signals based on neighboring blocks, and constructs a bitstream that arranges prediction mode information in a specific order within minimal coding blocks, optimizing the coding process based on the chroma format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If intra prediction modes are coded and decoded separately for luma and chroma signals, then prediction accuracy is improved, but processing efficiency deteriorates
Solution Approach 1:
The patent combines the coding and decoding of intra prediction modes for luma and chroma signals into a unified process. The prediction mode information is coded once and shared between luma and chroma components, eliminating redundant separate processing while maintaining prediction accuracy through the use of prediction mode derivation units that can generate appropriate prediction modes for each signal type from the shared coded information.
2Measurement precision
If separate coding is performed for luma and chroma signals, then signal processing accuracy is improved, but coding complexity increases
Solution Approach 1:
The patent implements a universal coding structure where a single intra prediction mode coding unit serves multiple functions by encoding prediction mode information that can be used for both luma and chroma signals. The system includes derivation units that can universally generate prediction modes for different signal types from the same coded data, reducing overall coding complexity while maintaining accurate signal processing.
3Measurement precision
If intra prediction is performed in units of blocks with separate mode coding, then prediction precision is improved, but bitstream length increases
Solution Approach 1:
The patent extracts and removes redundant prediction mode information from the bitstream by implementing a shared coding mechanism. Instead of encoding separate prediction modes for luma and chroma signals, the system extracts the essential prediction mode data once and reuses it for both signal types, significantly reducing the total bitstream length while preserving prediction precision through intelligent derivation of signal-specific modes from the shared coded information.
Data Source
AI summary
In a case where a partition mode in which luma signals are partitioned horizontally and vertically is set when an intra prediction of a picture signal is made in units of minimal coding blocks set in advance, an intra prediction unit is configured to make an intra prediction of a chroma signal in units of prediction blocks of the intra prediction of chroma signals within the minimal coding block set in accordance with a chroma format. A second bitstream constructing unit constructs a bitstream of information relating to a luma intra prediction mode of a prediction block of luma signals and information relating to a chroma intra prediction mode of a prediction block of chroma signals.