Chroma-Format Intra Sub-Partitioning for Image Bitstream Coding
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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 subblock-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 high-resolution and high-quality images are transmitted and stored, then image quality and resolution are improved, but transmission cost and storage cost increase
Solution Approach 1:
The image block is divided into multiple sub-blocks for independent processing. The patent applies intra subblock-partitioning (ISP) where a current block is split into four sub-blocks, and different prediction modes can be applied to each sub-block. This segmentation allows for more precise local compression without sacrificing overall image quality, reducing the bits required to represent the image while maintaining high resolution.
Solution Approach 2:
Different prediction modes are applied to different sub-blocks based on local characteristics. The patent determines whether to apply ISP to chroma component blocks based on their size and chroma format, allowing adaptive processing where larger chroma blocks receive ISP treatment while smaller blocks use conventional methods. This local adaptation optimizes compression efficiency for each region.
2Measurement precision
If high-resolution and high-quality images are transmitted and stored, then image quality and resolution are improved, but transmission cost and storage cost increase
Solution Approach 1:
The image block is divided into multiple sub-blocks for independent processing. The patent applies intra subblock-partitioning (ISP) where a current block is split into four sub-blocks, and different prediction modes can be applied to each sub-block. This segmentation allows for more precise local compression without sacrificing overall image quality, reducing the bits required to represent the image while maintaining high resolution.
Solution Approach 2:
The patent changes the processing parameters adaptively based on block size and chroma format. When the chroma block size is larger than a threshold, ISP is applied; otherwise, conventional intra prediction is used. This parameter change strategy reduces the amount of information needed to represent the image by selecting the most efficient processing mode for each case.
3Productivity
If intra subblock-partitions (ISP) is applied to images with various chroma formats, then encoding/decoding efficiency is improved, but device complexity increases
Solution Approach 1:
The patent changes the processing parameters adaptively based on block size and chroma format. When the chroma block size is larger than a threshold, ISP is applied; otherwise, conventional intra prediction is used. This parameter change strategy reduces the amount of information needed to represent the image by selecting the most efficient processing mode for each case.
Solution Approach 2:
Different prediction modes are applied to different sub-blocks based on local characteristics. The patent determines whether to apply ISP to chroma component blocks based on their size and chroma format, allowing adaptive processing where larger chroma blocks receive ISP treatment while smaller blocks use conventional methods. This local adaptation optimizes compression efficiency for each region.
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.