Image Decoding Boundary Width Control for Encoding Efficiency
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Solution Overview
Problem
Existing image decoding techniques using geometric partitioning mode (GPM) have limited weighted averaging patterns, resulting in suboptimal encoding performance.
Innovation Solution
An image decoding device and method that control the boundary width of division modes by selecting and applying various weighting coefficients based on the distance from the division boundary, allowing for asymmetrical and symmetrical patterns to improve encoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a limited weighted averaging pattern is used in GPM, then the device complexity is reduced, but the encoding performance deteriorates
Solution Approach 1:
The patent introduces dynamic boundary width control where the boundary width can be adjusted based on image characteristics and coding conditions. Instead of using a fixed limited pattern, the system adapts the boundary width parameter to optimize encoding performance for different scenarios while maintaining manageable complexity through controlled adaptation.
Solution Approach 2:
The patent changes the parameter of boundary width from a fixed value to a variable parameter that can take multiple values. By introducing a boundary width parameter that can be selected from multiple possibilities and is signaled in the bitstream, the system achieves better encoding performance without excessive complexity, as the parameter change is efficiently communicated through the existing syntax structure.
2Productivity
If multiple weighted averaging patterns are introduced, then the encoding performance is improved, but the syntax complexity increases
Solution Approach 1:
The patent makes the existing boundary width syntax structure multi-functional by enabling it to represent multiple boundary width values through a single parameter. The same syntax element `boundaryWidth` can indicate different width values (e.g., 0, 1, 2) depending on the signaled value, allowing multiple averaging patterns to be represented using the existing syntax framework without adding separate syntax elements for each pattern.
Solution Approach 2:
The patent prepares multiple boundary width values in advance and signals which one should be used through a compact indicator. The system pre-defines the set of possible boundary widths and uses efficient coding (such as context-based arithmetic coding) to signal the selected width, allowing the decoder to quickly retrieve the appropriate values without complex runtime calculations or additional syntax parsing.
3Ease of operation
If the boundary width is fixed, then the decoding process is simplified, but the adaptability to different image types is reduced
Solution Approach 1:
The patent introduces dynamic adaptability by allowing the boundary width to be signaled differently based on the coding condition. The system can adapt the boundary width parameter according to image characteristics, motion characteristics, or other coding conditions, enabling optimal performance for different image types while maintaining a relatively simple decoding process through efficient parameter signaling and retrieval.
Data Source
AI summary
An image decoding device (200) including a circuit that controls decoding of syntax for controlling a boundary width of a division mode of a sequence to be decoded.