Video Coding Transform Block Syntax Element Decoding
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Solution Overview
Problem
Traditional video coding technologies face challenges in efficiently compressing video data, particularly in reducing redundancy and managing bandwidth/storage requirements, especially with the increasing demand for high-resolution video content.
Innovation Solution
The proposed solution involves a method for video encoding/decoding that includes processing circuitry to decode syntax elements in multiple passes within a transform block, utilizing context modeling and specific scanning orders to optimize entropy coding, and adapting coding techniques for transform skip and BDPCM modes to improve coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional single-pass entropy coding is used, then the decoding process is simpler, but the bitstream size is larger and coding efficiency is lower
Solution Approach 1:
The patent divides the entropy coding process into multiple passes (first pass and second pass) for decoding syntax elements within a transform block. The first pass decodes certain syntax elements (e.g., significance flags) while the second pass decodes remaining syntax elements (e.g., coefficient levels). This segmentation allows more efficient bitstream encoding by better exploiting statistical dependencies, reducing overall bitstream size despite increased decoding complexity
Solution Approach 2:
The first coding pass performs preliminary decoding of syntax elements that provide contextual information for the second pass. By decoding significance flags and other preparatory data in the first pass, the system establishes a foundation that enables more efficient decoding of remaining elements in the second pass, improving overall coding efficiency
2Productivity
If transform coefficients are coded without mode adaptation, then the coding process is simpler, but coding efficiency is reduced
Solution Approach 1:
The patent introduces dynamic adaptation of coding techniques based on the transform block mode. When transform skip mode or BDPCM mode is detected, the entropy coding process is adapted accordingly - for example, by skipping certain decoding steps or modifying the syntax element interpretation. This dynamic behavior improves coding efficiency for specific modes while adding complexity only when those modes are active
Solution Approach 2:
The patent applies different coding strategies to different regions or modes of the transform block. Instead of using a uniform coding approach, the system adapts the entropy coding method based on local characteristics such as the presence of transform skip mode or BDPCM mode, optimizing compression for each local context while maintaining overall system functionality
Data Source
AI summary
Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes receiving circuitry and processing circuitry. The processing circuitry decodes a first syntax element at coding locations within a transform block for a current block in a first coding pass that scans the coding locations within the transform block, and decodes a second syntax element at the coding locations within the transform block in a second coding pass that is after the first coding pass and scans the coding locations within the transform block. Then, the processing circuitry determines residuals in the transform block based on at least the decoded first syntax element and the decoded second syntax element at the coding locations in the transform block, and reconstructs samples of the current block based on the residuals in the transform block.