Phase Disparity Correction for Quad Bayer Image Sensors
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Solution Overview
Problem
Phase disparities between subpixels in quad Bayer color filter array image sensors introduce image artifacts during the demosaicing process, particularly in low light conditions, affecting image quality.
Innovation Solution
An imaging device with an image processor that estimates and corrects phase disparities between subpixels prior to demosaicing, using a phase disparity estimator and corrector to generate corrected values for demosaicing, thereby reducing image artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If phase disparity subpixels are used in quad Bayer color filter array image sensor, then focus information and image processing capability are improved, but image artifacts are introduced during demosaicing process
Solution Approach 1:
The patent applies preliminary action by performing phase disparity correction on subpixel values before the demosaicing process. The image processor estimates phase disparities between subpixels and corrects these disparities prior to generating demosaiced image data, thereby preventing artifacts from being introduced during demosaicing while preserving the focus information capability of phase disparity subpixels
2Object-generated harmful factors
If phase disparity correction is performed prior to demosaicing, then image artifacts are reduced, but processing complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the subpixel values based on estimated phase disparities before demosaicing. The image processor changes the parameters (subpixel values) to compensate for phase disparities, thereby reducing artifacts. This approach integrates correction into the existing processing pipeline without requiring separate complex hardware components
Data Source
AI summary
An imaging device includes an image sensor and an image processor. The image sensor includes an array of pixels. At least one pixel in the array of pixels includes an array of phase disparity subpixels. The array of pixels includes a set of filter elements arranged in a filter pattern, with different subsets of pixels receiving light through different types of filter elements in the set of filter elements. The image processor is configured to receive values measured by at least the phase disparity subpixels; estimate phase disparities between the received values; generate, using the estimated phase disparities, a set of corrected values for the phase disparity subpixels; and generate, using the set of corrected values for the phase disparity subpixels, a set of demosaiced values for each image plane in a set of image planes. Each image plane is associated with a different type of filter element in the set of filter elements.