Single-Step Color Interpolation for Chromatic Aberration Correction
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Solution Overview
Problem
Traditional methods for generating color images from single-chip digital cameras require double interpolation, leading to increased processing load and image deterioration due to magnification chromatic aberration and edge detection issues.
Innovation Solution
A color image processing apparatus that includes a color plane decomposition unit, a coordinate conversion unit, a sampling unit, and a color generation unit, which calculates sampling coordinates and interpolates pixel values to generate a color image with a single interpolation calculation, addressing chromatic aberration and image distortion simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If double interpolation is performed for color image generation and distortion correction, then chromatic aberration correction is achieved, but processing load increases and image deterioration occurs
Solution Approach 1:
The patent combines color interpolation and distortion correction into a single interpolation operation. By calculating sampling coordinates that incorporate both color plane separation and distortion parameters, the system performs both functions simultaneously rather than sequentially, thereby reducing processing load while maintaining correction effectiveness.
Solution Approach 2:
The interpolation unit is designed to perform multiple functions: it conducts color interpolation to generate full RGB information while simultaneously applying distortion correction through coordinate transformation. This multi-functional approach eliminates the need for separate processing stages.
2Reliability
If double interpolation is performed for color image generation and distortion correction, then chromatic aberration correction is achieved, but image quality deteriorates
Solution Approach 1:
By merging color interpolation and distortion correction into one operation, the patent avoids performing interpolation on already-interpolated data. The single interpolation is performed on original color mosaic image data, preserving image quality while achieving both color completion and distortion correction.
Solution Approach 2:
The sampling coordinates are pre-calculated to incorporate distortion correction parameters before the interpolation occurs. This preliminary coordinate transformation ensures that the interpolation is performed at the correct locations that account for distortion, eliminating the need for subsequent correction operations that would degrade quality.
3Productivity
If traditional demosaic processing is used, then color image is generated, but edge detection accuracy decreases due to magnification chromatic aberration
Solution Approach 1:
The patent applies different sampling coordinates to different color planes (R, G, B) based on their specific distortion characteristics. By separating color planes and applying plane-specific coordinate transformations, the system accounts for local variations in distortion and chromatic aberration, improving edge detection accuracy in colored regions.
Data Source
AI summary
An image processing device includes: a coordinate conversion unit (142) which calculates a corresponding sampling coordinate on a color mosaic image corresponding to a pixel position of a color image when a deformation process is performed, according to the pixel position of the color image; a sampling unit (143); a sampling unit (143) which interpolates-generates a pixel value in a sampling coordinate for each of color planes obtained by decomposing the color mosaic image; and a color generation unit (144) which generates a color image by synthesizing interpolation values of the respective color planes. Each pixel value of a color image subjected to a deformation process is obtained as a pixel value of the sampling coordinate from the color mosaic image by interpolation calculation, thereby realizing the color interpolation process for generating a color image from the color mosaic image and a deformation process of the color image by one interpolation calculation.