Image Scaling Using Dark Pixel Intensity for Autofluorescence Correction
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Solution Overview
Problem
In digital imaging of biological specimens, accurately comparing images taken at different exposure times is challenging due to autofluorescence overlap with fluorescent markers, making it difficult to remove autofluorescence effectively when images are not captured at the same exposure time.
Innovation Solution
The method involves determining the dark pixel intensity of a digital camera to accurately scale pixel intensity from one exposure time to another, allowing for the adjustment of images taken at optimal exposure times to different exposure times, enabling accurate autofluorescence subtraction and image registration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If images are taken at different exposure times to optimize signal capture and avoid saturation, then image quality for specific features is improved, but the ability to accurately remove autofluorescence deteriorates
Solution Approach 1:
The patent applies parameter changes by using the dark pixel intensity value (measured at zero exposure time) as a reference parameter to correct the linear relationship between pixel intensity and exposure time. This allows accurate scaling of images taken at different exposure times, resolving the contradiction between optimizing image quality at different exposure times and maintaining accuracy for autofluorescence removal.
2Productivity
If simple linear scaling is used to adjust pixel intensity for different exposure times, then processing speed is improved, but estimation accuracy deteriorates
Solution Approach 1:
The patent replaces the simple mechanical linear scaling operation with a corrected linear scaling method that incorporates dark pixel intensity measurement. This substitution maintains the computational efficiency of linear scaling while dramatically improving accuracy by accounting for the camera's baseline offset, thus resolving the contradiction between processing speed and estimation accuracy.
Data Source
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AI summary
Methods for scaling an image taken an optimal exposure time to a selected exposure time, generally comprising, determining a dark pixel intensity of an imaging device; acquiring a first image at an optimal exposure time; and adjusting a pixel intensity of one or more pixels in the first image, based at least in part on the dark pixel intensity,for a second exposure time that is different from the optimal exposure time.