Partial Lens Shading Compensation for Image Sensors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current portable image sensors experience image distortion due to the geometric arrangement of pixel arrays and color filters, leading to color shift issues.
Innovation Solution
A partial lens shading compensation method that divides an image area into multiple partial areas centered on the optical center, using different compensation gains based on the position of target pixels within these areas to correct lens shading effects and improve color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lens shading compensation is applied to the entire image area, then color shift is improved, but computation complexity and memory requirements increase
Solution Approach 1:
The image area is divided into multiple partial areas (e.g., first, second, and third partial areas) with different compensation characteristics. Each partial area has its own compensation gain values, allowing localized correction without processing the entire image uniformly. This segmentation reduces the overall computation complexity while maintaining correction effectiveness in each region.
Solution Approach 2:
Different compensation gains are applied to different partial areas based on their specific shading characteristics. The compensation method uses position-dependent gain values that vary across the image area, providing locally optimized correction rather than a uniform approach, thereby improving color shift correction efficiency.
2Manufacturing precision
If conventional lens shading compensation is applied, then color shift is corrected, but memory requirements increase
Solution Approach 1:
By dividing the image area into partial areas with distinct compensation characteristics, the patent reduces the total number of compensation parameters that need to be stored. Each partial area uses simplified gain values based on position, reducing memory requirements compared to storing full compensation data for every pixel.
Solution Approach 2:
The patent applies compensation only to specific partial areas that require correction rather than the entire image area. This partial action approach reduces the quantity of compensation data that needs to be stored in memory while still achieving effective color shift correction in the affected regions.
Data Source
AI summary
Method and apparatus for partial lens shading compensation are provided. An image area is divided, from the inside towards the outside of the image area, into several partial areas centered on an optical center of the image. When a target pixel is identified as being located in one of the partial areas, a corresponding compensation gain is determined according to the position of the target pixel with reference to the optical center. Another compensation gain is determined according to the position of the target pixel with reference to the optical center. A mixed compensation value is determined according to the compensation gains, so as to compensate the target pixel.