Piecewise Linear Color Correction Function
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Solution Overview
Problem
Current color profiles for digital-image input and output devices introduce significant color errors and irregularities, particularly when translating device-dependent data to device-independent data, leading to discrepancies in image representation across different devices.
Innovation Solution
A system and method for correcting device-independent color spaces using a piecewise linear correction function that selectively adjusts color regions, ensuring corrections diminish as colors move away from the adjusted region, thereby preventing artifacts and image corruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional color profiles are used to translate device-dependent data to device-independent data, then color representation can be established, but significant color errors and irregularities are introduced
Solution Approach 1:
The patent applies parameter changes by using a piecewise linear correction function that modifies color space parameters selectively. The correction function adjusts specific color regions (such as skin tones, reds, greens, blues, yellows, cyans, and magentas) while maintaining other color regions unchanged, thereby improving color accuracy without introducing widespread errors across the entire color space
Solution Approach 2:
The patent implements local quality by applying different correction characteristics to different regions of the device-independent color space. The piecewise linear correction function is designed to selectively adjust specific color regions (e.g., skin tones, saturated colors) while leaving other regions unaffected, allowing localized optimization of color accuracy without compromising overall color consistency
2Measurement precision
If corrections are applied to improve color accuracy in specific regions, then color errors are reduced, but artifacts and image corruption may be introduced
Solution Approach 1:
The patent uses parameter changes through a piecewise linear correction function that modifies color space parameters in a controlled manner. The correction function is designed with specific mathematical properties (linear segments, defined boundaries) that allow improvement of color accuracy in target regions while preventing the introduction of artifacts through uncontrolled or aggressive corrections
Solution Approach 2:
The patent applies segmentation by dividing the device-independent color space into multiple distinct regions (skin tones, reds, greens, blues, yellows, cyans, magentas, and other colors). The piecewise linear correction function then applies different correction parameters to each segment, allowing targeted improvement of color accuracy in each region while maintaining overall image integrity and preventing artifact generation
Data Source
AI summary
According to an embodiment of the present invention, selective tristimulus corrections to device-independent coordinates are applied using a piecewise linear correction function. The piecewise linear correction function is defined such that a maximum of the piecewise linear correction function occurs at a boundary condition of a corresponding device-dependent color space, and the piecewise linear correction function is linearly reduced to zero or approximately zero as values in the corresponding device-dependent color space approach either a different boundary condition or a neutral axis. By having the piecewise linear correction function reduce linearly to zero or approximately zero, corrections to one region of color smoothly diminish and blend into the other regions of color, thereby substantially preventing the introduction of artifacts or image corruption due to the corrections.