Chroma Block Splitting Constraints for Efficient Image Encoding
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to an increase in transmission and storage costs due to the rise in the amount of transmitted information, necessitating high-efficient image compression technology.
Innovation Solution
An image encoding/decoding method that limits the size of chroma blocks and restricts certain splitting types, such as quadtree and binary splitting, to reduce the signaling of splitting information, thereby optimizing encoding/decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chroma block size is limited and splitting types are restricted, then the amount of bitstream is reduced and encoding/decoding efficiency is improved, but the flexibility in block partitioning is limited
Solution Approach 1:
The patent applies parameter changes by dynamically selecting allowed splitting types based on chroma block size. When chroma block size is limited to certain values (e.g., 8x8, 16x16), the set of allowed splitting types is restricted to prevent redundant signaling. This parameter-dependent restriction reduces the bitstream amount while maintaining optimal encoding efficiency for the given block size constraints.
2Quantity of substance
If chroma block size is limited, then the amount of transmitted information is reduced, but image quality may be compromised
Solution Approach 1:
The patent segments the chroma block into smaller units by limiting maximum chroma block size and allowing flexible splitting into smaller blocks. This segmentation enables finer granularity in frequency domain processing, which helps maintain image quality while reducing the total amount of transmitted information through more efficient quantization and transformation at smaller block sizes.
Solution Approach 2:
The patent changes the parameter of chroma block size to optimize the balance between data量 and quality. By restricting chroma block sizes to specific values and allowing adaptive splitting, the system achieves better compression efficiency without significant quality loss, as smaller blocks allow more precise frequency representation with fewer bits.
3Quantity of substance
If splitting information is reduced by limiting splitting types, then bitstream size is reduced, but encoding flexibility is constrained
Solution Approach 1:
The patent applies parameter changes by making the set of allowed splitting types dependent on chroma block size. When chroma block size is restricted to certain values, the splitting type selection is constrained to a predefined subset, which reduces the number of bits needed for signaling while maintaining sufficient encoding flexibility for practical applications.
Data Source
AI summary
An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus includes determining a splitting type of a current block, splitting the current block into a plurality of lower-layer blocks based on the splitting type, and decoding the lower-layer blocks. In this case, the current block may be a chroma block, and the determining the splitting type of the current block may be performed by disallowing a predetermined type, in which a width or height of the lower-layer blocks is a predetermined value, among a plurality of splitting types.