Chromatic Correction for Displays with Differing Gamuts
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Solution Overview
Problem
Current methods for color correction fail to accurately render colors on displays with different color gamuts, leading to unsatisfactory results due to the mismatch between reference and target display gamuts, especially with the advent of extended gamut displays that exceed traditional color standards.
Innovation Solution
A method and system for color correction that reformats source image content for non-reference type displays and generates metadata for gamut mapping, ensuring chromatic transformation for accurate color representation on both non-reference and reference type displays, using gamut mapping to correct colors for displays with non-standard gamuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If color correction is performed using reference display gamut standards, then color accuracy is maintained for standard displays, but color representation becomes inaccurate on displays with different gamuts
Solution Approach 1:
The patent transforms color data from reference display color space parameters to target display color space parameters by changing the gamut parameters. This involves converting color values based on the specific characteristics (primary colors, white point, gamma) of the target display device, thereby adapting the color representation to match the target display's capabilities while maintaining color accuracy.
Solution Approach 2:
The patent introduces an intermediate color space transformation process that acts as a mediator between the reference display color space and the target display color space. This intermediary transformation uses gamut mapping algorithms to bridge the gap between different color gamuts, enabling accurate color representation across diverse display devices without direct reference to specific display characteristics until the final transformation step.
2Adaptability or versatility
If extended color gamut displays are used, then broader color range is achieved, but color clipping and hue errors occur when displaying content created for standard gamuts
Solution Approach 1:
The patent performs preliminary color space transformation and gamut mapping before the actual display process. By pre-processing the color data to account for the target display's extended gamut characteristics, the system prevents color clipping and hue errors from occurring during display. This preliminary adjustment ensures that colors are properly mapped to the extended gamut range before rendering.
Solution Approach 2:
The patent implements dynamic gamut mapping that adapts to the specific characteristics of the target display device. Rather than using a fixed transformation, the system dynamically adjusts the color mapping based on the target display's color space parameters, enabling accurate color reproduction across varying display capabilities including extended gamut displays.
3Measurement precision
If separate color correction methods are developed for each display type, then accuracy for that specific display type is improved, but system complexity increases
Solution Approach 1:
The patent creates a universal color correction system that can handle multiple display types and gamuts through a single unified framework. The system uses standardized color space transformation processes that work across different display technologies (LCD, plasma, OLED, projection) by adapting to each display's specific color space parameters rather than requiring separate correction methods for each display type.
Solution Approach 2:
The patent achieves display-specific color accuracy through parameter-based adaptation rather than display-type-specific algorithms. By changing the color space parameters (primary colors, white point, gamma) to match the target display characteristics, the system provides accurate color correction for any display type using the same underlying transformation framework, thereby reducing system complexity.
Data Source
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AI summary
The invention relates to methods and systems for displays with chromatic correction with differing chromatic ranges. A method comprises carrying out a chromatic correction on the content of an image source, by means of at least one of a display of non-reference type with a non-reference chromatic range and a display of the reference type with a reference chromatic range. The above step includes reformatting (530) the content of the image source to give a reformatted image source content which has undergone a chromatic correction for display on displays of the non-reference type with a non-reference chromatic range. The above step also comprises generation (586) of metadata for mapping chromatic range which chromatically transforms the reformatted image content which has undergone a chromatic correction for display on displays of the reference type with a reference chromatic range. The source image content is only reformatted for display of the non-reference type with the non-reference chromatic range.