Alpha Channel Video Coding Cross-Layer Processing

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Solution Overview

Problem

Current video coding methods are inefficient in processing alpha channels due to ineffective tools and processes, leading to slow encoding and decoding speeds.

Innovation Solution

The proposed solution involves leveraging cross-layer correlations between base and alpha layers, selectively applying coding tools, and interleaving information from both channels to improve prediction accuracy and speed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If current video coding methods are used for alpha channels, then the encoding and decoding processes are simple, but the encoding and decoding speeds are slow

Engineering Contradiction:

Improveencoding and decoding speedVSAvoidprocessing efficiency

Core Design Contradiction:

SpeedVSProductivity

Solution Approach 1:

The patent merges the processing of base layer and alpha layer by applying the same video coding tools and processes to both layers. This unified approach enables faster processing speeds while maintaining efficient alpha channel coding, directly resolving the contradiction between speed and productivity.

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If alpha channels are processed using conventional video coding methods, then the implementation is straightforward, but the coding efficiency is low

Engineering Contradiction:

Improvealpha channel coding efficiencyVSAvoidcoding process complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent makes the video coding process universal by applying the same coding tools and processes to both base layer and alpha layer. This multi-functional approach improves alpha channel coding efficiency without requiring separate specialized processes, thereby avoiding increased complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent changes the processing parameters by treating alpha channel data with the same coding parameters and tools as base layer data. This parameter unification simplifies the coding process while improving efficiency, resolving the contradiction between productivity and device complexity.

Inventive Principle:

Principle #35Parameter changes

3Speed

If separate processing processes are used for base layer and alpha layer, then each layer can be optimized independently, but the overall processing speed decreases

Engineering Contradiction:

Improveprocessing speedVSAvoidprediction accuracy

Core Design Contradiction:

SpeedVSManufacturing precision

Solution Approach 1:

The patent combines the processing of base layer and alpha layer into a unified process, applying the same video coding tools to both. This merging enables faster overall processing speed while maintaining prediction accuracy through the consistent application of optimized coding techniques across both layers.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20220279185A1Methods of coding images/videos with alpha channels

Publication Date: 2022.09.01 LEMON INC(GB)

AI summary

Example implementations include a method, apparatus and computer-readable medium of video coding, comprising determining, for a conversion between a video comprising a plurality of pictures and a bitstream of the video, first layer information which is utilized in a first process performed on a first layer of each picture. The implementations further include determining, second layer information which is utilized in a second process performed on a second layer of each picture. Additionally, the implementations further include performing the conversion for the second layer based on the first layer information and the second layer information.