Video Coding Unit Padding for Uniform Slice Reconstruction
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Solution Overview
Problem
Existing media encoding and decoding technologies result in uneven subjective quality of padded pictures due to differences in reconstruction quality between slices with and without padding content, leading to inconsistent visual experience.
Innovation Solution
The method involves determining coding information based on full padding information of coding units, adjusting coding parameters to balance the number of coded bits, and performing fixed-length encoding to ensure consistent quality across slices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If picture padding is performed to enable integer slice division, then the encoder and decoder can operate normally, but the subjective quality of the padded picture becomes uneven
Solution Approach 1:
The patent applies different coding information to different coding units based on their padding status. Fully padded coding units are identified and assigned specific coding information (such as fixed-length encoding or adjusted bit allocation) that differs from non-fully padded units. This local differentiation ensures that padding regions do not degrade the overall picture quality, resolving the contradiction between enabling normal encoder/decoder operation and maintaining uniform subjective quality across the padded picture.
2Device complexity
If coding parameters are not adjusted for padded regions, then encoding is simpler, but reconstruction quality differs between slices with and without padding content
Solution Approach 1:
The patent changes coding parameters specifically for fully padded coding units by determining their full padding information and assigning them appropriate coding information. This may include using fixed-length encoding, adjusting the number of coded bits, or modifying quantization parameters for padded regions. These parameter changes ensure consistent reconstruction quality across all slices while maintaining manageable encoding complexity through systematic parameter adjustment.
3Manufacturing precision
If a fixed number of coded bits is allocated to each coding unit, then quality uniformity is improved, but compression efficiency decreases
Solution Approach 1:
The patent applies fixed-length or adjusted coding specifically to fully padded coding units while allowing variable-length encoding for non-padded units. This localized approach ensures that padding regions maintain consistent quality without forcing fixed-length encoding on the entire picture. The compression efficiency is preserved by adapting the coding strategy to the specific needs of each coding unit based on its padding status.
Data Source
AI summary
A method includes: performing picture padding on a to-be-encoded picture to obtain a padded picture; then, obtaining a coding unit based on the padded picture; next, determining coding information of the coding unit based on full padding information of the coding unit; and afterwards, encoding the coding unit based on the coding information to generate a bitstream. The full padding information indicates whether all samples in the coding unit are picture padding samples, and the coding information includes at least one of a number of padding bits or a coding length.