Defective Pixel Correction Using Checkered And Diagonal Texture Detection
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Solution Overview
Problem
Image sensing devices often capture images with defective pixels that fail to display color or light correctly, leading to deteriorated image quality.
Innovation Solution
An image processing device that includes a checkered pattern determiner and a diagonal pattern determiner to identify the directionality of textures within a kernel, and a target pixel corrector to adjust defective pixels based on determined patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional image processing methods are used to correct defective pixels, then general image quality is improved, but images containing checkered pattern textures or diagonal patterns cannot be corrected accurately
Solution Approach 1:
The patent implements dynamic pattern recognition that adapts the correction method based on the detected texture pattern. The system calculates gradient sums in multiple directions (vertical, horizontal, diagonal) and dynamically selects the appropriate correction algorithm based on which pattern is detected, making the correction process adaptable to different image content types.
Solution Approach 2:
The patent changes the correction parameters based on the detected pattern type. For checkered patterns, it uses one set of correction parameters, while for diagonal patterns or other textures, it uses different parameters. This allows the system to optimize correction accuracy for each specific pattern type by adjusting the processing parameters dynamically.
2Measurement precision
If simple gradient-based correction is used, then processing speed is maintained, but correction accuracy for patterned textures deteriorates
Solution Approach 1:
The patent segments the correction process into distinct stages: first calculating gradient sums in multiple directions, then determining whether a checkered pattern or diagonal pattern is present, and finally applying the appropriate correction method. This segmentation allows the system to maintain simplicity in each individual step while achieving high overall accuracy through the coordinated sequence of operations.
Data Source
AI summary
An image processing device includes: a checkered pattern determiner configured to determine whether a texture within a kernel including a target pixel has directionality of a predetermined checkered pattern; a diagonal pattern determiner configured to determine whether the texture has directionality of a diagonal pattern when the texture does not have the directionality of the predetermined checkered pattern; and a target pixel corrector configured to correct the target pixel based on a result of a determination obtained by the checkered pattern determiner and the diagonal pattern determiner.