Video Signal Palette Map Construction for Compression Efficiency
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Solution Overview
Problem
Current video compression techniques face challenges in efficiently encoding and decoding high-resolution, high-quality video signals, particularly for 3D video content, due to increased data size and complexity.
Innovation Solution
A method and apparatus for constructing a palette map and deriving a palette index in a block during video signal encoding and decoding, using mode identifiers to determine the palette index mode, which improves prediction and restoration efficiency by employing index or copy modes based on sample position and remaining palette indexes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution and high-quality video encoding is used, then image quality is improved, but data size increases
Solution Approach 1:
The patent changes the parameter representation by using palette indexes (discrete indices) instead of direct color values, and by applying compression techniques that modify how video data is encoded and stored, thereby reducing data size while preserving image quality
Solution Approach 2:
The patent uses reference pictures and motion compensation to copy and reuse video data from previous frames, avoiding redundant storage and transmission of identical or similar visual information, thus reducing overall data size
2Quantity of substance
If video compression techniques are applied, then data size is reduced, but transmission cost and storage cost increase
Solution Approach 1:
The patent employs advanced compression parameters including palette-based color representation, motion estimation, and transform coding to achieve higher compression ratios, thereby reducing the amount of data that needs to be transmitted and stored, which directly lowers transmission and storage costs
3Productivity
If palette mode is used for encoding, then compression efficiency is improved, but decoding complexity increases
Solution Approach 1:
The patent performs preliminary actions by pre-defining palette maps and pre-calculating motion vectors during encoding, so that the decoder can directly use these pre-computed values without performing complex calculations, thereby reducing decoding complexity while maintaining compression efficiency
Data Source
AI summary
Provided is a method for decoding a video signal. Such a method may include constructing a palette map related to a current block encoded in a palette mode, determining, based on a mode identifier of a current sample included in the current block, a palette index mode of the current sample, the mode identifier is used to determine one of an index mode or a copy mode, deriving a palette index of the current sample based on the palette index mode, and reconstructing the current sample by using the palette map of the current block and the palette index.