Image Block Splitting by Color Format for Adaptive Prediction

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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 rise in the amount of transmitted information, necessitating high-efficient image compression technologies.

Innovation Solution

An image encoding/decoding method and apparatus that determines a split mode based on color format and size of a chroma block, allowing for improved encoding/decoding efficiency by specifying prediction modes for intra and inter prediction, and a method of transmitting and storing bitstreams generated by this process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If image resolution and quality are improved, then image quality is enhanced, but transmission cost and storage cost increase

Engineering Contradiction:

Improveimage qualityVSAvoidamount of transmitted information

Core Design Contradiction:

Manufacturing precisionVSQuantity of substance

Solution Approach 1:

The image is divided into multiple blocks that are processed independently. Each block is further segmented into prediction units and transform units, allowing selective application of compression techniques to different regions based on their characteristics, thereby maintaining quality while reducing overall data volume

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different prediction modes (intra and inter) are applied to different blocks based on their local characteristics. The prediction mode type varies by block, allowing optimal compression for each region while maintaining overall image quality, thus reducing the amount of transmitted information without sacrificing manufacturing precision

Inventive Principle:

Principle #3Local quality

2Quantity of substance

If transmission cost is reduced through compression, then storage cost decreases, but image quality may deteriorate

Engineering Contradiction:

Improveamount of transmitted informationVSAvoidimage quality

Core Design Contradiction:

Quantity of substanceVSManufacturing precision

Solution Approach 1:

The encoding system dynamically selects between intra prediction and inter prediction modes for each block based on its characteristics. This dynamic adaptation allows the system to maintain image quality by choosing the most appropriate prediction method for each region while optimizing compression ratios, thus reducing transmission cost without quality deterioration

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The prediction mode type parameter is changed based on block characteristics and color formats. By adjusting this parameter dynamically, the system optimizes the balance between compression efficiency and image quality, ensuring that quality is maintained while transmission and storage costs are reduced

Inventive Principle:

Principle #35Parameter changes

3Quantity of substance

If encoding complexity is increased to improve compression efficiency, then transmission cost decreases, but processing time increases

Engineering Contradiction:

Improveamount of transmitted informationVSAvoidprocessing time

Core Design Contradiction:

Quantity of substanceVSLoss of time

Solution Approach 1:

The image processing is segmented into independent blocks that can be encoded separately. This segmentation allows parallel processing of different blocks, reducing overall processing time while maintaining high compression efficiency through selective application of encoding techniques to each block

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system applies prediction modes selectively based on block characteristics rather than uniformly to all blocks. By applying more complex encoding only where necessary and using simpler methods elsewhere, the system achieves good compression efficiency without excessive processing time increases

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12413715B2Image encoding/decoding method and device for determining division mode on basis of color format, and method for transmitting bitstream

Publication Date: 2025.09.09 LG ELECTRONICS INC

AI summary

An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may comprise determining prediction mode characteristic information based on a color format of a current block, determining a prediction mode type of a lower-layer block split from the current block based on the prediction mode characteristic information, obtaining the lower-layer block by splitting the current block based on the prediction mode type of the lower-layer block, and decoding the lower-layer block based on the prediction mode type of the lower-layer block. The prediction mode type of the lower-layer block comprises a first prediction mode type specifying that both an intra prediction mode and an inter prediction mode are available, a second prediction mode type specifying that only the intra prediction mode is available and a third prediction mode type specifying that only the inter prediction mode is available. Based on a first condition for the current block being satisfied, the prediction mode characteristic information has a first value, and the first condition comprises a case where a color format of the current block is a monochrome format or a 4:4:4 format. Based on the first condition for the current block being not satisfied, the prediction mode characteristic information has a second value or a third value based on at least one of a color format, split mode or size of the current block.