Video Block Prediction With IBC-LIC for Local Illumination Changes

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Solution Overview

Problem

Existing video coding technologies, such as MPEG-2, MPEG-4, AVC, HEVC, and VVC, require further improvements in coding efficiency for digital video processing.

Innovation Solution

Implementing intra block copy (IBC) and local illumination compensation (LIC) in video processing, determining parameters for IBC-LIC, and performing compensation processes to enhance prediction or reconstruction of video units.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional video coding technologies (MPEG-2, MPEG-4, AVC, HEVC, VVC) are used, then basic video encoding/decoding is achieved, but coding efficiency is insufficient and needs improvement

Engineering Contradiction:

Improvecoding efficiencyVSAvoidvideo processing complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent combines IBC and LIC into a unified IBC-LIC mode, merging two separate prediction techniques into a single integrated operation. This allows the system to achieve higher coding efficiency by leveraging both block copying and local illumination compensation in one process, rather than separately, thus resolving the contradiction between improved coding efficiency and processing complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The LIC component applies local illumination compensation specifically to regions where illumination changes occur, rather than uniformly processing the entire block. This localized approach improves coding efficiency in challenging regions (with illumination changes) while maintaining simplicity in uniform regions, effectively managing the complexity-efficiency trade-off

Inventive Principle:

Principle #3Local quality

2Measurement precision

If IBC-LIC is applied to handle local illumination changes, then prediction accuracy is improved, but processing time increases

Engineering Contradiction:

Improveprediction accuracyVSAvoidprocessing time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The system applies IBC-LIC selectively only to blocks or regions where illumination changes are detected, rather than uniformly applying it to all blocks. This partial application strategy improves prediction accuracy where needed (in regions with illumination changes) while minimizing processing time by avoiding unnecessary computations in uniform regions

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent uses parameter-based decision making to determine when IBC-LIC should be applied, using thresholds and flags to control the compensation process. By changing the activation state of IBC-LIC based on detected illumination characteristics, the system achieves high prediction accuracy when necessary while maintaining fast processing through selective application

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260106994A1Method, apparatus, and medium for video processing

Publication Date: 2026.04.16 DOUYIN VISION CO LTD

AI summary

Embodiments of the disclosure provide a solution for video processing. A method for video processing is proposed. The method includes: determining, for a conversion between a video unit of a video and a bitstream of the video, whether an intra block copy (IBC) and local illumination compensation (LIC) (IBC-LIC) is applied to the video unit; in accordance with a determination that the IBC-LIC is applied to the video unit, determining a set of parameters used in the IBC-LIC; performing a compensation process to a prediction or reconstruction of the video unit based on the IBC-LIC; and performing the conversion based on the compensated prediction or reconstruction of the video unit.