Color Gamut Mapping Using Transition Protection Zone

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Solution Overview

Problem

Conventional color gamut mapping techniques face challenges in efficiently mapping colors between different gamuts, leading to issues like hue distortions, artifacts, and loss of vividness due to their high resource requirements and complexity, especially when dealing with mismatched color gamuts between source content and display devices.

Innovation Solution

A method and system for color gamut compression and extension using a universal framework, which determines a color transition protection zone (TPZ) to perform linear color gamut mapping between device-independent color spaces, allowing for efficient compression or extension without perceptible hue distortions or artifacts, thereby reducing hardware complexity and costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional color gamut mapping techniques are used to map colors between different gamuts, then color mapping functionality is achieved, but hue distortions and artifacts occur

Engineering Contradiction:

Improvecolor mapping accuracyVSAvoidhue distortions and artifacts

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the color gamut mapping process into distinct operational modes (gamut compression when target is narrower, gamut extension when target is wider) based on the relative size comparison between source and target gamuts. This segmentation allows each mode to be optimized independently, preventing hue distortions and artifacts that occur in conventional unified approaches.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent inverts the conventional approach by using a single universal framework that can perform both gamut compression and extension, rather than requiring separate techniques for each scenario. This inversion simplifies the system while maintaining high color mapping accuracy without hue distortions or artifacts.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If conventional color gamut mapping techniques are used, then color mapping is performed, but system resource usage and hardware complexity increase

Engineering Contradiction:

Improvecolor mapping functionalityVSAvoidhardware complexity and resource requirements

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent creates a universal color gamut mapping framework that performs both gamut compression and gamut extension functions within a single system. This multi-functional approach eliminates the need for separate hardware or software components for different mapping scenarios, significantly reducing device complexity and resource requirements while maintaining full color mapping functionality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent changes the operational parameters (compression ratio, extension factor) dynamically based on the detected relationship between source and target gamut sizes. By adjusting parameters rather than using fixed complex algorithms, the system achieves efficient color mapping with reduced computational resources and hardware complexity.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If linear color gamut compression or extension is performed using the universal framework, then processing efficiency is improved, but color accuracy must be maintained

Engineering Contradiction:

Improveprocessing efficiencyVSAvoidcolor accuracy

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent implements dynamic parameter adjustment within the linear transformation process, adapting compression ratios and extension factors in real-time based on the specific source and target gamut characteristics. This dynamic approach maintains color accuracy while enabling efficient processing, as the system optimizes parameters for each mapping scenario rather than using fixed rigid transformations.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12067957B2Color gamut compression and extension

Publication Date: 2024.08.20 SAMSUNG ELECTRONICS CO LTD

AI summary

One embodiment provides a method comprising determining a first representation of a source gamut of an input content in a first (2D) device-independent color space, determining a second representation of a target gamut of a display device in a second 2D device-independent color space, and determining a color transition protection zone (TPZ) based on the source gamut and the target gamut. The method further comprises utilizing a color gamut mapping (CGM) module to perform, based on the TPZ, linear color gamut compression from the first 2D device-independent color space to the second 2D device-independent color space if the target gamut is narrower than the source gamut. The method further comprises utilizing the same CGM module to perform, based on the TPZ, linear color gamut extension from the first 2D device-independent color space to the second 2D device-independent color space if the target gamut is wider than the source gamut.