Color Shading Correction via Channel Consistency
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Solution Overview
Problem
Conventional anti-shading correction methods fail to address color shading independently of lens shading, resulting in unbalanced colors towards the periphery of images, especially in imaging systems with smaller image sensors.
Innovation Solution
An anti-shading correction mechanism that utilizes a color correction circuit to generate color shading correction grids based on estimated color consistency models for red and blue color channels, allowing for separate correction of color shading independent of lens shading, using interpolation of reference gamma coefficients corresponding to different color temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional anti-shading correction methods are used to correct lens shading, then lens shading is corrected, but color shading is not corrected independently resulting in unbalanced colors
Solution Approach 1:
The patent segments the anti-shading correction process into two independent components: lens shading correction and color shading correction. By separating these corrections, the system can address color balance accuracy independently while maintaining the existing lens shading correction functionality. This is achieved by generating separate correction grids for luminance and color channels.
Solution Approach 2:
The patent applies different correction characteristics to different regions of the image by generating position-dependent correction grids. The color shading correction grid is specifically designed to address color imbalances in different spatial locations, particularly at the periphery where color shading is most pronounced, while applying appropriate correction strength at each location.
2Area of stationary object
If image sensor size is decreased to improve device compactness, then device size is reduced, but color shading becomes more substantial
Solution Approach 1:
The patent changes the correction parameters based on the specific characteristics of small image sensors. By generating color shading correction grids that are adapted to the smaller sensor geometry and light path characteristics, the system maintains color balance accuracy despite the increased susceptibility to color shading in compact designs.
3Reliability
If separate color shading correction is implemented independent of lens shading correction, then color balance accuracy is improved, but correction circuit complexity increases
Solution Approach 1:
The patent merges the color shading correction functionality with the existing anti-shading correction circuit by generating a color shading correction grid that can be applied in conjunction with the lens shading correction grid. This integration approach allows separate color shading correction while utilizing shared computational resources and circuitry, thereby limiting the increase in overall system complexity.
Data Source
AI summary
An imaging system includes a color correction circuit configured to perform color shading correction of an image independent of lens shading correction of the image. A method for anti-shading correction of an image includes correcting, by a color correction circuit, for color shading of the image independent of lens shading correction of the image.