Contour-Free Skin Tone Correction in Video Processing
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Solution Overview
Problem
Conventional methods for skin tone correction in video processing introduce artifacts and require complex contour reduction steps, failing to operate effectively in native color spaces and often result in over-saturation issues, especially for human skin tones.
Innovation Solution
A contour-free point operation method that maps skin tone corrections continuously within the color space, avoiding unmapped and doubly mapped regions, adjusts color components sequentially, and operates with linear operations and single-dimensional lookup tables, directly processing native chroma samples without luminance data or surrounding pixel dependencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional skin tone correction methods are used, then skin tone adjustment is achieved, but artifacts are introduced in segmented areas and contour reduction complexity increases
Solution Approach 1:
The invention segments the color space into distinct regions (skin tone region and non-skin tone region) based on chroma coordinates. By identifying pixels within the skin tone region and applying correction only to those pixels, the method achieves precise skin tone adjustment without affecting other areas, thereby eliminating artifacts while maintaining operational simplicity.
2Manufacturing precision
If conventional skin tone correction methods are used, then skin tone adjustment is achieved, but over-saturation occurs and natural skin tones are lost
Solution Approach 1:
The invention applies different processing characteristics to different regions of the color space. Within the skin tone region, chroma values are adjusted toward reference values to achieve natural skin tones. Outside this region, original chroma values are preserved. This localized approach ensures skin tone correction accuracy while preventing over-saturation in other color regions.
3Manufacturing precision
If conventional skin tone correction methods are used, then color adjustment is achieved, but operation in non-native color spaces requires expensive custom silicon
Solution Approach 1:
The invention operates directly in the native YCbCr color space of the input signal, utilizing the existing chroma components (Cb and Cr) for skin tone correction. By performing corrections in the native color space rather than transforming to another color space, the method eliminates the need for expensive custom silicon hardware and enables implementation through standard processing components.
4Manufacturing precision
If conventional skin tone correction methods are used, then skin tone adjustment is achieved, but separate contour reduction steps are required adding processing complexity
Solution Approach 1:
The invention combines skin tone detection and correction into a single unified operation. By identifying skin tone pixels and applying chroma adjustment in one simultaneous process, the method achieves accurate skin tone correction without requiring separate contour reduction steps, thereby improving processing efficiency while maintaining correction accuracy.
Data Source
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AI summary
A method for color tone correction is disclosed. The method includes the steps of (A) generating a plurality of first intermediate components by scaling a plurality of first color components towards a first ideal color, wherein the first color components (i) are for a fir plurality of pixels in an input video signal and (ii) fall inside a first region of a color space, (B) generating a plurality of first corrected components by adjusting the first intermediate components such that a first mapping of the first color components to the first corrected components is both (i) continuous in the color space and (ii) non-overlapping in the color space and (C) generating an output video signal by combining the first corrected components with a plurality of unaltered color components, wherein the unaltered color components (i) are for a second plurality of the pixels and ii fall outside the first region.