Adaptive Color Correction via Luminance Weighting
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Solution Overview
Problem
Conventional digital image processing methods independently adjust luminance and chrominance signals, leading to color noise in low-luminance images, as they do not effectively account for pixel luminance when correcting chrominance.
Innovation Solution
A method and device for adaptive color correction that uses a weighting procedure to adjust pixel chrominance based on pixel luminance, employing a linear weighting function with a threshold to determine a weighting value and limit chrominance adjustments to prevent noise, comprising a weighting decision device and a weighting limit device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chrominance is adjusted independently of luminance using conventional methods, then chrominance correction can be applied uniformly, but color noise occurs in low-luminance regions
Solution Approach 1:
The patent applies different chrominance adjustment strategies to different luminance regions. A weighting function is used to determine the degree of chrominance adjustment based on local luminance values, ensuring that low-luminance regions receive reduced or no chrominance correction while high-luminance regions receive full correction. This local differentiation eliminates color noise in dark areas while maintaining color accuracy in bright areas.
Solution Approach 2:
The patent dynamically changes the chrominance adjustment parameter (weighting factor) based on the luminance parameter. By using a weighting function that maps luminance values to appropriate chrominance adjustment weights, the system adapts the chrominance correction strength according to the local luminance condition, preventing color noise in low-luminance regions while maintaining effective color correction in high-luminance regions.
2Manufacturing precision
If chrominance adjustment weighting is applied to all luminance levels, then color accuracy improves, but excessive weighting in low-luminance regions amplifies color noise
Solution Approach 1:
The patent implements spatially varying chrominance adjustment by computing weighting values based on local luminance characteristics. Regions with low luminance receive weighting values close to zero, effectively disabling chrominance adjustment in those areas and preventing noise amplification. High-luminance regions receive weighting values closer to one, maintaining full chrominance correction and color accuracy.
Solution Approach 2:
The weighting function serves as an intermediary between luminance and chrominance adjustment. It translates luminance values into appropriate chrominance adjustment weights, acting as a control mechanism that prevents direct application of uniform chrominance correction. This intermediary layer ensures that chrominance adjustment is modulated according to luminance conditions, avoiding noise amplification in dark regions.
Data Source
AI summary
The present invention relates to a method and a device for adaptive color correction by weighting procedure according to the pixel luminance so as to adjust the pixel chrominance. The present invention prevents color noise occurring in the dark pictures. The method for adaptive color correction, comprises steps of: providing a luminance value of a pixel: determining a weighting value corresponding to said luminance value of said pixel, wherein said weighting value substantially increases when said luminance value increases; and adjusting chrominance of said pixel according to said weighting value.