Chroma-Aware Intra Prediction Blocks Using ISP Partitioning
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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 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.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If image resolution and quality are improved to meet high-definition and ultra high-definition demands, then image quality is improved, but transmission cost and storage cost increase due to increased information amount
Solution Approach 1:
The patent applies intra sub-block partitioning (ISP) technology that divides a current block into multiple sub-blocks and performs independent intra prediction on 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 parts of the image block.
Solution Approach 2:
The patent implements different prediction modes for different sub-blocks within a current block based on local characteristics. By analyzing local variations and applying appropriate prediction strategies to each sub-block, the system achieves higher local quality without proportionally increasing the overall bitstream size, thus improving image quality while controlling transmission costs.
2Measurement precision
If image resolution and quality are improved to meet high-definition and ultra high-definition demands, then image quality is improved, but storage cost increases due to increased information amount
Solution Approach 1:
The patent applies intra sub-block partitioning (ISP) technology that divides a current block into multiple sub-blocks and performs independent intra prediction on 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 parts of the image block.
Solution Approach 2:
The patent implements different prediction modes for different sub-blocks within a current block based on local characteristics. By analyzing local variations and applying appropriate prediction strategies to each sub-block, the system achieves higher local quality without proportionally increasing the overall bitstream size, thus improving image quality while controlling storage costs.
3Productivity
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 changes the parameter of block partitioning by applying different partitioning strategies based on chroma format (4:2:0, 4:2:2, 4:4:4). The system adapts the ISP application to match the chroma format characteristics, applying ISP only when beneficial and skipping it when unnecessary, thereby improving encoding efficiency while controlling complexity through conditional parameter adjustment.
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.