Image Sensor ISP Color Correction for Pixel-Level Distortion
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Solution Overview
Problem
Existing image sensors and processing methods suffer from color distortion during image data processing, which affects the quality and efficiency of the final output images.
Innovation Solution
An image sensor with an integrated image signal processor (ISP) that performs color correction and distortion level identification, generating corrected RGB image data to alleviate color distortion by adjusting chrominance values based on identified distortion levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If color correction is performed in the application processor, then color distortion can be corrected, but processing time and resource consumption increase
Solution Approach 1:
The image sensor performs color correction in advance before the image data is transmitted to the application processor. The ISP corrects chrominance values and generates corrected RGB image data proactively, so that when the data reaches the AP, the color distortion correction is already complete, eliminating the need for additional processing time in the AP.
Solution Approach 2:
The color correction function is extracted from the application processor and relocated to the image sensor's ISP. By separating this processing task to a dedicated hardware unit in the image sensor, the AP is freed from the burden of performing color correction, thereby reducing its processing time and resource consumption.
2Manufacturing precision
If color correction is performed in the application processor, then color distortion can be corrected, but processing resources are consumed
Solution Approach 1:
The color correction function is extracted from the application processor and relocated to the image sensor's ISP. By separating this processing task to a dedicated hardware unit in the image sensor, the AP is freed from the burden of performing color correction, thereby reducing its processing time and resource consumption.
Solution Approach 2:
The image sensor performs self-service by incorporating the color correction function within its own ISP. The ISP automatically corrects color distortion in the captured image data before transmission, making the system self-sufficient and eliminating the need for the AP to allocate resources for this function.
3Manufacturing precision
If chrominance values are corrected for all pixels, then color distortion is reduced, but processing complexity increases
Solution Approach 1:
Instead of applying uniform correction to all pixels, the system calculates distortion levels individually for each pixel and applies correction only where necessary. Pixels with high distortion levels receive correction, while pixels with low distortion levels are processed without correction, optimizing processing complexity.
Solution Approach 2:
The correction process is dynamic and adaptive. The ISP calculates distortion levels in real-time and adjusts the correction intensity for each pixel based on its specific distortion characteristics. This dynamic approach allows the system to optimize processing complexity by applying correction only where needed.
Data Source
AI summary
Provided is an image sensor that includes a pixel array including a plurality of pixels in a plurality of rows and a plurality of columns, and an image signal processor (ISP) configured to process a raw image generated by the pixel array to generate an output image, wherein the ISP is configured to obtain the raw image, generate RGB image data based on the raw image, generate corrected RGB image data by applying a selected image data processing method to the RGB image data, identify an image distortion level corresponding to each pixel of the RGB image data by comparing the RGB image data and the corrected RGB image data, correct each chrominance value corresponding to each pixel of the RGB image data based on the image distortion level corresponding to each pixel of the RGB image data, and generate the output image based on each corrected chrominance value.