Transform Coefficient Buffer Reuse for Palette Coding
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Solution Overview
Problem
Current video coding systems face challenges in reducing implementation costs and improving system throughput, particularly in HEVC screen content coding, where palette coding techniques do not efficiently utilize system resources such as the transform coefficient buffer.
Innovation Solution
The method involves reusing the transform coefficient buffer for palette coding by storing palette-related information, including palette run type, indices, escape values, and flags, and grouping escape values and predictor initialization values for efficient encoding and decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transform coefficient buffer is allocated separately for palette coding, then the reliability of palette coding is improved, but the device complexity and implementation cost increase
Solution Approach 1:
The transform coefficient buffer is designed to serve multiple purposes: it stores transform coefficients for conventional prediction modes and palette-related information for palette coding mode. This multi-functional buffer eliminates the need for separate dedicated buffers, reducing implementation cost while maintaining reliable palette coding operations through proper buffer management and state clearing between different coding modes
2Measurement precision
If escape values are coded individually for each pixel, then the measurement precision of pixel values is improved, but the productivity of encoding and decoding decreases
Solution Approach 1:
Escape values for multiple pixels are grouped together and coded as a collective group rather than individually. The encoder identifies consecutive pixels requiring escape coding and transmits their values in a consolidated manner, while the decoder efficiently distributes these grouped values to the appropriate pixel positions, maintaining precise pixel representation while significantly improving encoding and decoding throughput
3Reliability
If palette-related information is stored in dedicated memory, then the reliability of palette coding is improved, but the loss of substance in system memory increases
Solution Approach 1:
The transform coefficient buffer is repurposed to store palette-related information including palette indices, escape values, and run-length data during palette coding mode. This reuse of existing buffer infrastructure eliminates the need for additional dedicated memory allocation, reducing system memory consumption while ensuring reliable storage of all necessary palette coding data through appropriate buffer clearing and state management
Data Source
AI summary
A method of video coding with reduced implementation cost by reusing transform coefficient buffer palette for palette coding is disclosed. If the current prediction mode is an Intra prediction mode or the Inter prediction mode, information related to transform coefficients for prediction residual of the current block resulted from Intra prediction or Inter prediction is stored in the transform coefficient buffer. If the current prediction mode is the palette coding mode, information related to palette data associated with the current block is stored in the transform coefficient buffer. The current block is then encoded or decoded based on the information related to the transform coefficients if the current block is coded in the Intra prediction mode or the Inter prediction mode, or the information related to the palette data stored in the transform coefficient buffer if the current prediction mode is the palette coding mode.