Color Space Conversion Matrix for Accurate Camera-to-Display Reproduction
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Solution Overview
Problem
Organic light emitting displays with wide color gamuts struggle to accurately reproduce images captured by cameras with narrow color gamuts, often exaggerating colors due to the mismatch in color gamuts between camera and display devices.
Innovation Solution
An image processing device and method that utilize color space conversion matrices calculated from measured color data to convert camera RGB data into display R′G′B′ data, ensuring accurate color reproduction by aligning the color gamuts of the camera and display, and optionally converting between sRGB and camera RGB data to standardize image representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sRGB color gamut under D65 is used as the standard color gamut for image storage and reproduction, then compatibility with standard display devices is improved, but color accuracy on organic light emitting displays with wide color gamut deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the color space conversion matrix based on the specific display device characteristics. Instead of using a fixed sRGB conversion matrix, the system calculates a customized conversion matrix that accounts for the actual color gamut and characteristics of the organic light emitting display, thereby achieving accurate color reproduction while maintaining compatibility
Solution Approach 2:
The patent implements dynamics by making the color space conversion process adaptive rather than static. The system determines the appropriate conversion matrix in real-time based on the display device type and characteristics, allowing the same camera to produce accurately colored images on both standard and wide-gamut displays without manual intervention
2Adaptability or versatility
If a wide color gamut display is used, then color vibrancy and display capability are improved, but color reproduction accuracy of narrow color gamut camera images deteriorates
Solution Approach 1:
The patent uses an intermediary approach by introducing a customized color space conversion matrix as a mediator between the camera's narrow color gamut and the display's wide color gamut. This conversion matrix acts as a translation layer that maps camera colors to display colors accurately, preventing direct incompatibility from causing color distortion
Solution Approach 2:
The system changes the conversion parameters by calculating a specific color space conversion matrix tailored to the display's characteristics. This involves measuring or obtaining the display's color gamut parameters and using them to construct a conversion matrix that preserves color accuracy while leveraging the wide gamut capability
Data Source
AI summary
An image processing device includes: a demosaicking unit which converts a bayer image from a camera sensor into red, green image and blue images; a first color space conversion unit which converts first camera RGB data into first display R′G′B′ data using a first color space conversion matrix; and a display unit which displays an image using the first display R′G′B′ data, where the first color space conversion matrix is calculated from a relationship in which the product of the first color space conversion matrix and a transpose of a first N×3 matrix is a transpose of a second N×3 matrix, where the first N×3 matrix represents camera RGB data of N number of colors, and the second N×3 matrix represents display R′G′B′ data of the N number of colors calculated by measuring the N number of colors displayed in the display unit using a spectrophotometer.