Video Signal Palette Mode Index Encoding
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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 content, due to increased data size and transmission/storage costs.
Innovation Solution
A method and apparatus for predicting and restoring video signals using a palette mode, which involves constructing a palette map and deriving a palette index for blocks to be encoded or decoded, with selective signaling of palette index runs based on last mode type flags and remaining indices, improving encoding/decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution and high-quality video signals are used, then image quality is improved, but data size increases leading to higher transmission and storage costs
Solution Approach 1:
The video signal is divided into blocks that are processed independently using palette mode. Each block is represented by a limited set of palette indices rather than full pixel values, segmenting the data representation to reduce overall data size while maintaining visual quality.
Solution Approach 2:
The patent changes the parameter representation from full pixel values to palette indices. By mapping pixel values to a limited palette and encoding only the indices, the data size is significantly reduced while preserving the essential visual information for high-quality reconstruction.
2Quantity of substance
If palette mode is used for compression, then data size is reduced, but complexity of encoding and decoding increases
Solution Approach 1:
The palette map is constructed in advance before encoding the actual block data. By pre-defining the palette entries and their indices, the encoding process is simplified as it only needs to reference the pre-established palette rather than processing full pixel values during compression.
Solution Approach 2:
The palette map serves as an intermediary between the original image data and the compressed representation. Instead of directly compressing pixel values, the system uses the palette as a intermediate structure that maps visual information to compact indices, simplifying the overall encoding process.
3Productivity
If palette index run encoding is used, then compression efficiency is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The encoding system dynamically adapts between different palette index modes (run encoding versus direct encoding) based on the characteristics of the current block. This dynamic selection optimizes compression efficiency for different types of content while managing the complexity of detection through adaptive decision-making.
Solution Approach 2:
The system changes the encoding parameter based on the block characteristics. When run encoding is applicable, it uses compressed run-length parameters; otherwise, it switches to direct index encoding. This parameter adaptation improves overall compression efficiency while providing clear detection rules for mode selection.
Data Source
AI summary
Provided is a method for decoding a video signal. Such a method may include obtaining at least one palette entry of a current block from a palette map of a previous block, constructing a palette map of the current block including the obtained palette entry, deriving a palette index of the current block by using palette index information and information about palette index run related to the current block, and reconstructing the current block by using the palette map of the current block and the palette index.