Video Bitstream Signaling for Skip-Merge Prediction Blocks
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Solution Overview
Problem
Existing video signal processing methods lack efficiency in coding, particularly in handling skip, merge, and transform-related parameters, leading to suboptimal compression and decoding performance.
Innovation Solution
A method and device that manage skip, merge, and CBF parameters by determining their inclusion in the bitstream based on specific mode values, optimizing their generation and inclusion in the bitstream to improve coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If all parameters (skip, merge, CBF) are always transmitted in the bitstream, then complete information is available for decoding, but data transmission volume increases and coding efficiency decreases
Solution Approach 1:
The patent extracts and transmits only the necessary parameters based on the prediction mode. When skip mode or merge mode is used, the CBF parameter is omitted from transmission since it is determined by the mode flag itself. This selective extraction reduces bitstream volume while maintaining decoding accuracy.
Solution Approach 2:
The patent implements dynamic parameter transmission where the inclusion of CBF parameter in the bitstream is determined by the value of mode flags. The system adaptively adjusts the set of transmitted parameters based on the prediction mode (skip, merge, or transform), optimizing the balance between information completeness and transmission efficiency.
2Measurement precision
If CBF parameter is always obtained from bitstream, then transform information is accurately decoded, but processing overhead and complexity increase
Solution Approach 1:
The patent performs preliminary determination of the CBF parameter value based on the prediction mode before actual decoding. When skip or merge mode is detected, the system pre-determines that CBF is not transmitted and uses the mode flag to infer the transform status, avoiding unnecessary parsing and processing operations.
Solution Approach 2:
The mode flags themselves serve to indicate transform status. The skip flag and merge flag inherently provide information about whether transform coefficients are present, allowing the decoder to self-determine the CBF value without requiring separate parameter transmission or complex processing.
3Adaptability or versatility
If skip mode and merge mode are supported, then coding flexibility improves, but parameter management complexity increases
Solution Approach 1:
The patent uses the mode flags (skip flag, merge flag) to serve multiple functions: indicating the prediction mode type and simultaneously determining the presence or absence of transform coefficients. This multi-functionality reduces the need for separate parameters and simplifies the overall parameter management structure.
Solution Approach 2:
The patent combines the mode indication function and transform status indication into a unified parameter structure. The skip and merge flags serve both to identify the prediction mode and to implicitly indicate whether transform coefficients should be expected, merging multiple pieces of information into concise flag values.
Data Source
AI summary
A video signal processing method comprises: obtaining, from a bitstream, a skip parameter (cu_skip_flag) indicating whether a skip mode is applied to a current block; when the skip parameter indicates that a mode is not the skip mode, obtaining, from the bitstream, a merge parameter (merge_flag) indicating whether the current block is coded with a merge mode; and determining whether a coded block flag (CBF) parameter (cu_cbf), which indicates whether a syntax element related to transform is obtained from the bitstream, is obtained, according to a value of the merge parameter, wherein, when the value of the merge parameter indicates the merge mode, the CBF parameter is not obtained from the bitstream and is determined to be a preconfigured value.