Palette Escape Pixel Binarization for Loss-Robust HEVC Decoding
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Solution Overview
Problem
Current designs of escape mode in palette mode of the H.265/HEVC standard are not robust to data loss, leading to severe quality degradation in reconstructed pixels due to transmission errors.
Innovation Solution
Implement a binarization process for encoding and decoding escape-coded pixels in palette mode that depends on a constant value of quantization parameter (QP) or sample depth, independent of unit-level QP values, to enhance robustness against data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If entropy coding of quantized sample values is used for escape-coded pixels in palette mode, then compression efficiency is improved, but robustness to data loss deteriorates due to transmission errors causing severe quality degradation
Solution Approach 1:
The patent changes the binarization parameters for escape-coded pixels from being dependent on unit-level QP values to being dependent on fixed parameters such as slice-level QP values or sample depth. This parameter change eliminates the parsing dependency that causes error propagation, thereby improving robustness to data loss while maintaining compression efficiency through entropy coding.
2Measurement precision
If unit-level QP values are used for binarization of escape-coded pixels, then encoding precision is improved, but parsing complexity increases due to dependencies on decoded QP values
Solution Approach 1:
The patent extracts the dependency on unit-level QP values from the binarization process of escape-coded pixels. By using fixed parameters such as slice-level QP values or sample depth instead, the patent removes the complex parsing dependencies while maintaining encoding precision through appropriate quantization.
3Loss of information
If transmission errors occur in entropy-coded quantized sample values, then data integrity is compromised, but error propagation is amplified due to parsing dependencies on unit-level QP values
Solution Approach 1:
The patent applies beforehand cushioning by using fixed binarization parameters that are independent of unit-level QP values. This prevents error propagation because transmission errors in quantized sample values cannot affect the parsing of subsequent data, as the binarization process does not depend on previously decoded QP values.
Data Source
AI summary
Approaches to robust encoding and decoding of escape-coded pixels in a palette mode are described. For example, sample values of escape-coded pixels in palette mode are encoded/decoded using a binarization process that depends on a constant value of quantization parameter (“QP”) for the sample values. Or, as another example, sample values of escape-coded pixels in palette mode are encoded/decoded using a binarization process that depends on sample depth for the sample values. Or, as still another example, sample values of escape-coded pixels in palette mode are encoded/decoding using a binarization process that depends on some other fixed rule. In example implementations, these approaches avoid dependencies on unit-level QP values when parsing the sample values of escape-coded pixels, which can make encoding/decoding more robust to data loss.