Chroma Component Clipping Prevention in HDR Video Encoding

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Solution Overview

Problem

Existing HDR video distribution methods face challenges in preserving high fidelity due to clipping of internal variables during post-processing, leading to visual artifacts, especially for saturated colors.

Innovation Solution

A method that modifies chroma component values by comparing them against given thresholds and adjusting color component values to prevent clipping, ensuring chroma values remain within acceptable limits, thereby maintaining color accuracy and reducing visual artifacts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If chroma component values are not modified during encoding, then encoding complexity is reduced, but clipping artifacts appear in post-processing for saturated colors

Engineering Contradiction:
Improveencoding complexityVSAvoidcolor fidelity
Core Design Contradiction:
Ease of manufactureVSReliability

Solution Approach 1:

The patent applies preliminary action by modifying chroma component values during the encoding stage before post-processing occurs. The encoder proactively adjusts chroma values to prevent future clipping artifacts, rather than waiting for problems to appear during playback or rendering. This advance intervention ensures color fidelity is maintained throughout the video pipeline.

Inventive Principle:
Principle #10Preliminary action

2Reliability

If chroma component values are modified to prevent clipping, then color fidelity is improved, but additional processing steps are required

Engineering Contradiction:
Improvecolor fidelityVSAvoidprocessing complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements parameter changes by modifying chroma component values within the existing encoding framework. Rather than introducing entirely new processing stages, the solution adjusts specific parameter ranges of chroma components during standard encoding operations. This approach maintains color fidelity while integrating smoothly into existing video processing pipelines.

Inventive Principle:
Principle #35Parameter changes

3Productivity

If standard HDR encoding is used without chroma modification, then encoding speed is maintained, but visual artifacts appear in saturated color regions

Engineering Contradiction:
Improveencoding speedVSAvoidvisual artifacts
Core Design Contradiction:
ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent converts the potential harm of clipping artifacts into a benefit by proactively managing chroma values during encoding. The method transforms what would be a post-processing problem into an encoding-stage solution, eliminating visual artifacts before they can manifest. This approach maintains encoding speed while preventing the generation of harmful visual artifacts in saturated color regions.

Inventive Principle:
Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS11575944B2Method and apparatus for encoding an image
Publication Date: 2023.02.07 INTERDIGITAL VC HOLDINGS INC
  • US11575944B2 patent drawing
  • US11575944B2 patent drawing
  • US11575944B2 patent drawing

AI summary

The present embodiments obtain chroma components representative of the chroma components of an output image from color components representative of an input image, and if a value of a pixel in at least one of said chroma components exceeds a given value, modify the value of said pixel in at least one of said color components in such a way that the value of said pixel in said at least one of said chroma components is lower than or equals to said given value.