Automatic Chroma Correction Using Window-Based Gain Adjustment
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Solution Overview
Problem
Existing digital image processing methods lead to chroma disharmony between adjacent regions during automatic color correction, resulting in a monotonous and discontinuous image.
Innovation Solution
A method and device that utilize an operation window and a target window on a plane coordinate system to adjust chroma values, ensuring continuity and harmony by determining the location of image points within these windows and applying a gain-based adjustment formula to align chroma signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If chroma signals are automatically adjusted to converge at the center of the region, then the picture appears more vivid with required color tones, but the adjusted picture becomes monochrome and causes disharmony in chroma between adjacent regions
Solution Approach 1:
The patent applies local quality by dividing the image into multiple regions and adjusting chroma signals differently for each region. Instead of uniformly converging all chroma values to the center, the method adjusts chroma signals based on the specific characteristics and requirements of each local region, preserving natural chroma transitions and avoiding monochrome effects while maintaining automatic adjustment capabilities.
Solution Approach 2:
The patent segments the chroma adjustment process into multiple stages: first identifying regions with insufficient chroma, then adjusting chroma signals within each region separately using defined operation windows and target windows. This segmentation allows different regions to be processed independently, maintaining chroma harmony between adjacent regions while achieving vivid color tones where needed.
2Ease of operation
If simple chroma adjustment methods are used, then the process is easy to implement, but the adjusted image appears discontinuous and disharmonious between adjacent regions
Solution Approach 1:
The patent incorporates feedback mechanisms by defining operation windows and target windows that provide guidance for chroma adjustment. The system continuously monitors chroma signal values and adjusts them based on their position relative to these windows, ensuring that adjustments maintain image continuity and harmony while remaining easy to implement through automated control.
Solution Approach 2:
The patent changes the parameters of chroma signal adjustment by introducing operation windows and target windows as control boundaries. Instead of using fixed adjustment rules, the method dynamically adjusts chroma values based on their position within these windows, allowing simple implementation while ensuring reliable image continuity and eliminating discontinuities between adjacent regions.
Data Source
AI summary
A method and a device for automatic color correction by defining an operation window, a target window, and an active region bounded by the preceding windows so as to adjust chroma values in the active region. Correction of chroma signals is associated with a window region rather than a certain point. Besides, the present invention provides correction of the chroma signals so as to prevent image discontinuity and disharmony.