Color Space Conversion Using Independent Saturation and Hue Control
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Solution Overview
Problem
Conventional methods for controlling colors in color imaging systems struggle with independent control of color components, particularly brightness and hue, leading to difficulties in representing colors across different displays and potential discontinuities in color spaces.
Innovation Solution
The method involves converting the original color space into a modified color space where saturation and hue components are independently controlled using a boundary value, allowing for precise control of color components without affecting other components, enabling control of saturation according to brightness or hue and hue according to brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional color control methods are used in color imaging systems, then color modification can be performed, but independent control of color components (brightness and hue) is difficult and discontinuities occur in color spaces
Solution Approach 1:
The patent segments the color control process by dividing the color space into multiple distinct color regions (e.g., red region, green region, blue region). Each region is controlled independently with its own transfer curve, allowing separate adjustment of brightness and hue for each color component without affecting other regions. This segmentation enables independent control of color components while maintaining consistency within each region.
Solution Approach 2:
The patent applies local quality by allowing different transfer curves to be applied to different color regions. Each region can have customized brightness and hue adjustment characteristics tailored to its specific requirements. This enables localized color component control where each region maintains its unique properties while avoiding discontinuities at region boundaries through careful curve design.
2Ease of operation
If transfer curves are used to control color components, then color modification is achieved, but brightness and hue cannot be controlled independently
Solution Approach 1:
The patent divides the color control function into separate transfer curves for brightness and hue within each color region. Instead of using a single transfer curve that couples brightness and hue control, the patent creates independent transfer curves that can be adjusted separately, enabling independent control of these color components while maintaining the color modification capability.
3Measurement precision
If color spaces are divided into fixed gamuts, then color correction can be performed, but uniformity of the color space is severely degraded
Solution Approach 1:
The patent employs dynamic transfer curves that can be adjusted independently for each color region while maintaining smooth transitions at boundaries. The transfer curves are designed to adapt to the specific characteristics of each region, allowing accurate color correction within regions while preserving overall color space uniformity through continuous transition functions that prevent abrupt changes at region boundaries.
4Productivity
If conventional methods control colors in YCbCr space, then color signals can be processed, but saturation components vary with brightness and hue making independent control difficult
Solution Approach 1:
The patent segments the YCbCr color space into distinct color regions and applies independent transfer curves to each region. This segmentation decouples the interdependence of saturation, brightness, and hue that exists in the conventional YCbCr space, allowing independent control of color components within each region while maintaining processing efficiency through region-based classification.
Data Source
AI summary
A method of and apparatus for converting a color space. The method includes: separating a color signal of a given pixel into a brightness component and a saturation component; obtaining a boundary value of the saturation component of a color gamut, to which the color signal belongs, in a first color space using the separated brightness component and saturation components; and converting the first color space into a second color space in which saturation components and hue components are independently controlled using the obtained boundary value.