Intra Sub-Partition Image Coding for Chroma-Aware Compression
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to a significant increase in transmission and storage costs due to the increased amount of transmitted information, necessitating high-efficient image compression technology.
Innovation Solution
An image encoding/decoding method and apparatus that applies intra sub-block-partitions (ISP) to images with various chroma formats, determining the availability of ISP based on block sizes and chroma formats, and generates a bitstream for efficient transmission and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution and high-quality images are transmitted and stored, then image quality is improved, but transmission cost and storage cost increase
Solution Approach 1:
The patent applies intra sub-block partitioning (ISP) to divide a current block into multiple sub-blocks (e.g., 2×2 sub-blocks) and performs independent intra prediction for each sub-block. This segmentation allows for more precise local prediction, improving image quality while maintaining compression efficiency by adapting to local variations in different regions of the block.
Solution Approach 2:
The patent enables different prediction modes and parameters to be applied to different sub-blocks within the same current block. This local quality approach allows each sub-block to be encoded with the most appropriate prediction method for its specific characteristics, improving overall image quality without uniformly increasing complexity across the entire block.
2Productivity
If intra sub-block-partitions (ISP) are applied to images with various chroma formats, then encoding/decoding efficiency is improved, but device complexity increases
Solution Approach 1:
The patent dynamically determines whether to apply ISP to chroma blocks based on the chroma format and block size. The system adapts the ISP application decision according to the specific chroma format (4:2:0, 4:2:2, 4:4:4) and the dimensions of the chroma block, applying ISP only when beneficial. This dynamic approach improves encoding efficiency for suitable cases while avoiding unnecessary complexity for cases where ISP would not provide significant benefits.
Data Source
AI summary
An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure may include determining whether a prediction mode of a current block is an intra prediction mode based on information on the prediction mode of the current block, determining whether intra sub-partitions (ISP) is available for the current block, when the prediction mode of the current block is an intra prediction mode, decoding an ISP application indicator indicating whether to apply ISP to the current block, when ISP is available for the current block, and generating a prediction block for the current block by applying ISP to the current block, upon determining that ISP applies to the current block based on the ISP application indicator.