Defective Pixel Correction Using Texture Direction Analysis
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Solution Overview
Problem
Existing image processing methods struggle to accurately detect and correct defective pixels, especially when multiple defective pixels occur in a neighboring area, leading to difficulties in determining texture direction and achieving effective correction, resulting in increased circuit complexity and processing delays.
Innovation Solution
An image processing device and method that determine the texture direction and detect defective pixels by calculating pixel value averages for groups of pixels sharing a reading circuit, using difference information to identify defective pixels and correct them based on the determined texture direction, thereby efficiently detecting and correcting multiple defective pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the related art correction method is applied, then only the center pixel is corrected in the neighboring area, but defective pixels other than the center pixel remain incorrect and influence later signal processing
Solution Approach 1:
The patent performs preliminary correction of all defective pixels in the neighboring area before the main signal processing. By detecting defective pixels and correcting them in advance using the neighboring area information, the system ensures that all pixels are corrected before they influence subsequent signal processing stages, eliminating the problem of uncorrected defective pixels affecting image quality
2Device complexity
If the related art correction method is applied, then the correction process is simple, but it requires performing signal processing after all pixel corrections are completed, increasing circuit scale and processing time
Solution Approach 1:
The patent performs defective pixel detection and correction in the neighboring area before the main signal processing begins. By completing the correction action in advance, the system eliminates the need for sequential processing where signal processing must wait for all corrections to finish, thereby reducing processing time and increasing productivity without significantly increasing circuit complexity
3Reliability
If defective pixels continuously occur or defects occur at shared circuit parts, then multiple defective pixels appear in the neighboring area, but it becomes difficult to acquire texture direction accurately
Solution Approach 1:
The patent extracts and removes the influence of defective pixels from the texture direction determination process. By detecting defective pixels in the neighboring area and excluding them from the texture direction analysis, the system maintains accurate texture direction determination even when multiple defective pixels are present, thereby resolving the contradiction between detection reliability and measurement precision
Data Source
AI summary
An image processing device includes a texture direction determining unit that determines a texture direction of an image, a defective pixel detecting unit that calculates a pixel value average for each of pixel groups including a plurality of pixels, and detects a defective pixel position on the basis of difference information of the pixel value average according to an arrangement direction of the pixel groups, and a correction unit that corrects, as a correction target, a pixel value at the defective pixel position detected on the basis of the difference information in the same pixel group arrangement direction as the texture direction determined by the texture direction determining unit.