Inter Prediction Motion Derivation for Skip and Merge Video Coding

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Solution Overview

Problem

Existing video compression technologies face inefficiencies in inter-prediction, particularly in deriving motion information for current blocks, especially when skip mode is applied, leading to increased data transmission and storage costs for high-resolution videos.

Innovation Solution

A method and apparatus for improving coding efficiency by determining a reference index for a current block based on neighboring blocks, allowing for direct transmission of motion information in entropy-coded form, and applying skip or merge modes during inter-prediction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If inter-prediction is used to compress video data, then data transmission and storage costs are reduced, but coding efficiency and performance deteriorate due to difficulties in deriving motion information for current blocks

Engineering Contradiction:

Improvedata transmission and storage costsVSAvoidcoding efficiency

Core Design Contradiction:

Loss of energyVSProductivity

Solution Approach 1:

The system uses motion information from neighboring blocks to automatically derive motion information for the current block without requiring additional signaling. The decoder independently determines reference indices and motion vectors by examining spatially adjacent blocks, enabling self-service derivation that improves coding efficiency while maintaining compression benefits

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Motion information from neighboring blocks is prepared and made available before decoding the current block. By pre-processing and storing motion information from adjacent blocks in the decoding buffer, the system enables rapid derivation of current block motion parameters without requiring complex real-time calculations during the decoding process

Inventive Principle:

Principle #10Preliminary action

2Loss of energy

If skip mode is applied to current blocks in inter-prediction, then compression ratio is improved, but coding performance deteriorates due to increased complexity in determining reference indices

Engineering Contradiction:

Improvecompression ratioVSAvoidcomplexity in determining reference indices

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The system applies different reference index determination strategies based on the local characteristics of neighboring blocks. When skip mode is detected, the decoder examines specific neighboring blocks (left, top, top-right) and selects reference indices based on their availability and consistency, rather than applying a uniform complex algorithm to all blocks

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The decoding process is segmented into distinct phases: first identifying skip mode application, then selectively examining neighboring blocks based on their positions and availability, and finally deriving reference indices only for blocks that meet specific criteria. This segmentation avoids unnecessary processing of blocks that don't require complex reference index determination

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If motion information is directly transmitted in entropy-coded form, then coding flexibility is improved, but data transmission volume increases

Engineering Contradiction:

Improvecoding flexibilityVSAvoiddata transmission volume

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The system extracts and transmits only the essential motion information parameters (reference indices and motion vectors) in entropy-coded form, rather than transmitting complete motion compensation data. By extracting only the critical parameters needed for reconstruction, the system maintains coding flexibility while minimizing the volume of transmitted data

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Motion information is directly transmitted in entropy-coded form only when necessary for maintaining coding flexibility, rather than for all blocks. The system applies partial transmission based on block characteristics and prediction mode, transmitting detailed motion information selectively to balance flexibility requirements with data volume constraints

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12581109B2Method for encoding and decoding image information and device using same

Publication Date: 2026.03.17 LG ELECTRONICS INC

AI summary

The present invention relates to the encoding and decoding of image information. According to the present invention, the decoding method comprises the steps of: entropy-decoding received information; performing inter prediction on a current block based on the entropy-decoded information; and restoring images by using the prediction results, wherein, in the inter prediction step, a skip mode or merge mode is applied to the current block and movement information of the current block may be determined based on the movement information of a neighboring block of the current block.