Light Field Refocus Image Color Blur Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Chromatic aberration correction in light field data leads to differences in sharpness between channels of a refocus image, causing color blur due to blurring from the aperture of the microlens.
Innovation Solution
An image processing apparatus that generates refocus images for each channel based on light field data, derives spatial frequency characteristics, and corrects the images to make sharpness uniform across channels using these characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If chromatic aberration correction is performed based on the method disclosed in Japanese Patent No. 4752031, then chromatic aberration is reduced, but the sharpness of each channel of a refocus image becomes different due to blurring resulting from an aperture of the microlens, causing color blur
Solution Approach 1:
The patent applies parameter changes by modifying the spatial frequency characteristics of each channel based on the virtual refocus position. The correction unit adjusts the spatial frequency characteristics using the derived characteristics and position information to compensate for the blurring differences caused by the microlens aperture, thereby uniforming the sharpness across channels while maintaining chromatic aberration correction
Solution Approach 2:
The patent employs preliminary action by deriving the spatial frequency characteristics for each channel in advance based on the optical characteristics and the virtual refocus position. This pre-computed information is then used by the correction unit to adjust the refocus images, ensuring uniform sharpness before final image generation
Data Source
AI summary
The image processing apparatus according to an embodiment of the present invention corrects a color blur of a refocus image due to light field data. The image processing apparatus includes a generation unit configured to generate a refocus image for each channel at a virtual refocus position based on light field data including a plurality of channels whose wavelengths are different and optical characteristics for each channel of an optical system used to obtain the light field data. Further, the image processing apparatus includes a derivation unit configured to derive spatial frequency characteristics for each channel from the optical characteristics for each channel and the virtual refocus position and a correction unit configured to correct the refocus image for each channel so as to make sharpness uniform based on the spatial frequency characteristics for each channel.