Gamma Correction for Display Devices Using Spectrum-Based Matrix Selection
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Solution Overview
Problem
Wide color gamut display devices experience metamerism failure, where images with the same color coordinate are perceived as having different colors due to varying light spectrums, despite gamma correction or multi-time programming operations.
Innovation Solution
A gamma correction method and system that measure the spectrum of a display device, select a correction matrix based on the spectrum, convert tristimulus data into perception tristimulus data using the selected matrix, and perform gamma correction to ensure consistent color perception across different display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gamma correction or multi-time programming operation is performed to achieve the same color coordinate, then color coordinate consistency is improved, but metamerism failure occurs where images are perceived as having different colors due to varying light spectrums
Solution Approach 1:
The patent introduces spectrum-based parameter selection to choose correction matrices according to the measured spectrum characteristics (peak wavelength, FWHM, spectrum similarity) of each display device. This changes the correction approach from uniform color coordinate adjustment to spectrum-aware correction, resolving the metamerism failure while maintaining color coordinate consistency
Solution Approach 2:
The patent applies different correction matrices to different display devices based on their specific spectrum characteristics. Each display device receives customized correction parameters tailored to its spectral properties, ensuring that the correction is locally optimized for each device's unique spectrum rather than applying a universal correction
2Reliability
If correction matrices are selected based on spectrum characteristics, then metamerism failure is prevented, but device complexity increases due to spectrum measurement and matrix selection processes
Solution Approach 1:
The patent pre-calculates and stores multiple correction matrices corresponding to different spectrum characteristics before actual operation. During operation, the system only needs to measure the spectrum, select the appropriate pre-computed matrix, and apply it, avoiding the complexity of calculating correction matrices in real-time while maintaining high color perception consistency
Data Source
AI summary
A gamma correction method is disclosed that performs gamma correction for a display device. A plurality of correction matrices respectively corresponding to a plurality of spectrums of different test display devices is obtained. A spectrum of the display device is measured. A correction matrix corresponding to the spectrum of the display device is selected from the plurality of correction matrices. Tristimulus data of the display device are measured and the measured tristimulus data are converted into perception tristimulus data by using the selected correction matrix. The gamma correction for the display device is performed based on the perception tristimulus data.