Intra Chroma Prediction Using Luma Interpolation
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Solution Overview
Problem
Current video compression technologies do not efficiently reconstruct chroma samples using a linear combination of interpolated luma samples, and they lack an effective method to conserve codeword bits during video data transmission.
Innovation Solution
A method and apparatus for performing intra chroma prediction by using a linear combination of previously reconstructed luma samples, which are interpolated from the same block and neighboring blocks, to reconstruct chroma samples. This approach also signals the proper prediction mode by relying on previously identified prediction mode information, reducing the need for transmitting additional codeword bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional chroma prediction modes are used, then chroma samples are predicted using conventional methods, but prediction accuracy is insufficient and cannot utilize luma sample interpolation
Solution Approach 1:
The patent merges luma sample interpolation with chroma sample prediction by using the linear combination of interpolated luma samples to predict chroma samples. This combines two previously separate processes (luma interpolation and chroma prediction) into a unified approach that improves chroma prediction accuracy while leveraging existing luma processing results.
Solution Approach 2:
The patent makes the luma sample interpolation process serve dual purposes: it generates interpolated luma values for luma reconstruction and simultaneously provides the basis for chroma sample prediction through linear combination. This multi-functional use of interpolated luma samples improves efficiency without requiring separate processing.
2Loss of information
If separate prediction mode signaling is implemented for chroma samples, then prediction mode information is fully specified, but the number of codeword bits transmitted increases
Solution Approach 1:
The patent makes the chroma prediction mode signaling self-service by relying on previously identified prediction mode information from luma samples. The system uses the already-transmitted luma prediction mode to infer or determine the chroma prediction mode, eliminating the need for separate chroma mode signaling and reducing bit transmission.
Solution Approach 2:
The patent performs prediction mode identification for luma samples first, and then uses this preliminary information to determine the chroma prediction mode. By establishing the luma prediction mode beforehand, the system prepares the necessary information that can be reused for chroma prediction, avoiding redundant signaling.
Data Source
AI summary
A method for signalling an intra chroma prediction mode and a method for implementing the signalled intra chroma prediction mode, the intra chroma prediction mode taking an intropolation of previously predicted luma samples from neighboring blocks of video data to attain an intra chroma prediction of a current chroma prediction unit.