Video Transform Flag Signaling for Compression-Efficient Decoding
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Solution Overview
Problem
Existing video encoding technologies face challenges in efficiently processing next-generation video contents with high spatial resolution, high frame rate, and high dimensionality, leading to increased memory storage, memory access rate, and processing power requirements.
Innovation Solution
A method for signaling flags to determine whether to apply transforms and transform types, including a primary transform and transform skip, with context-based entropy coding, optimizing conditions for flag transmission in video signal decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transform-related syntax coding is performed with detailed flags and indices, then transform accuracy is improved, but the number of signaling bits increases
Solution Approach 1:
The patent extracts and separates the signaling of transform flags and indices from the general syntax coding, allowing selective transmission based on block characteristics. This enables removing unnecessary signaling information while preserving essential transform parameters, thus reducing the number of signaling bits while maintaining transform accuracy where needed.
Solution Approach 2:
The patent applies different signaling strategies to different video blocks based on their local characteristics (e.g., block size, transform type). By adapting the level of detail in transform syntax coding to local requirements, the patent maintains high transform accuracy for complex blocks while using simplified signaling for simpler blocks, thereby reducing overall signaling bit count.
2Measurement precision
If multiple transform flags are signaled for each block, then transform control precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the transform control into multiple independent flags and indices that can be selectively coded. By dividing the transform control mechanism into separate components (primary transform flag, secondary transform flag, transform index), the patent simplifies the overall syntax structure while maintaining the ability to precisely control different transform aspects independently.
Solution Approach 2:
The patent introduces dynamic signaling where the presence and coding of certain transform flags and indices depends on the values of previous flags and block characteristics. This dynamic approach allows the syntax structure to adapt to actual transform needs, reducing complexity by only signaling what is necessary for each specific block.
3Productivity
If transform skip is always applied, then compression efficiency is improved, but video quality deteriorates
Solution Approach 1:
The patent implements dynamic selection between transform skip and actual transform based on block characteristics and content analysis. The transform skip flag is conditionally applied, allowing the system to switch between skipping transforms (for high compression efficiency in suitable blocks) and performing full transforms (for maintaining quality in blocks where it is beneficial), thus balancing compression efficiency and video quality.
Solution Approach 2:
The patent changes the transform parameter (whether to apply transform or skip) based on analyzed block characteristics such as block size, prediction mode, and content complexity. By adaptively adjusting this parameter, the patent achieves high compression efficiency for blocks suitable for transform skip while maintaining video quality for blocks requiring full transform processing.
Data Source
AI summary
The present invention discloses a method for encoding/decoding a video signal and an apparatus for the method. More specifically, a method for decoding a video signal comprises generating a residual block of a current block by performing entropy decoding on the video signal; if size of the current block is smaller than a predetermined first size, parsing a transform skip flag which indicates whether a transform skip is applied to the current block; determining whether to parse a primary transform flag which indicates whether a primary transform is applied to the current block; if it is determined to parse the primary transform flag, parsing the primary transform flag; and if the primary transform flag indicates that a primary transform is applied to the current block, generating a primary inverse transformed transform block of the current block by performing a primary inverse transform to the residual block.