Imaging Device Color Mixing Correction Sequence
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Solution Overview
Problem
Conventional imaging technologies fail to appropriately consider the sequence of correction processes, leading to potential deterioration in image quality, particularly in noise correction and color mixing correction, when using image pickup devices with color filters having larger basic array patterns.
Innovation Solution
An imaging apparatus with a color filter having a specific pattern of filters for different colors, where noise correction is performed subsequent to color mixing correction, and offset correction is done prior to and reversed after color mixing correction, ensuring appropriate color mixing correction without being affected by offset, and pixel defect correction is performed before color mixing correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If noise correction is performed before color mixing correction, then noise is reduced, but level differences between adjacent pixels are lost causing deterioration in color mixing correction
Solution Approach 1:
The patent performs color mixing correction before noise correction, establishing the proper processing sequence. By performing color mixing correction first when level differences between adjacent pixels are still present, the patent ensures accurate color interpolation. Subsequently, noise correction is applied to the color mixing corrected data, preventing noise from affecting the color mixing correction accuracy.
2Measurement precision
If offset correction is performed after color mixing correction, then offset is corrected, but the correction is affected by previous gain correction amounts
Solution Approach 1:
The patent performs offset correction before gain correction (including color mixing correction). By removing the offset component first, the patent ensures that subsequent gain corrections are applied to data without offset interference, improving the accuracy of both offset and gain correction processes.
3Reliability
If pixel defect correction is performed after color mixing correction, then defects are corrected, but color mixing correction cannot account for defective pixels
Solution Approach 1:
The patent performs pixel defect correction before color mixing correction. By identifying and correcting defective pixels first, the patent ensures that color mixing correction uses accurate pixel data from non-defective pixels, improving the precision of color interpolation and overall image quality.
Data Source
AI summary
A deterioration in image quality caused by correction can be prevented in comparison to when consideration is not given to the sequence in which correction is performed on an image captured by an image pickup device. An imaging apparatus 10 is configured including an optical system 12, an image pickup device 14, an image capture correction processing section 16, and an image processing section 18. The image capture correction processing section 16 is configured including a color mixing correction section 20, a noise correction section 22, an offset correction section 24 and a gain correction section 26. The color mixing correction section 20 reads image data from the image pickup device 14 and performs color mixing correction processing thereon. The noise correction section 22 performs noise correction processing on the image data on which the color mixing correction section 20 has performed color mixing correction processing.