Problem 682. Image Processing 002 : Fix Vignetting in a Visible Sensor
The task is to correct image files for Visible scanning sensors that due to errant tolerancing produce vignetted(V) images. The V artifact is in a converging ray bundle and only the edges are impacted to differing amounts. The obscuration varies cross-scan but is constant for all samples. Sensor package repair is cost prohibitive. Luckily, the Image Processing is Matlab based and needs only a fast function to perform the V adjustment good enough for govt work.
Output: Fixed image(Fimg) (Array <= 512x512 of type double)
Input: Vignetted Image file(Vimg) (double); Obscuration (1xncol)
Tolerance: Good enough is 1%+1 count of Truth (Timg)
Obscuration: Max is 25% at edge, Min 8 columns wide.
Vignetted Image creation: Start with Truth (Timg)
Vimg = Timg(1-Obscuration)
example: Obs = [.25 .1 0...0 .1 .25]; obs [50 20 0...0 20 50];
load penny.mat; Timg=double(P);
The Cody "Image processing 001" for an IR and using In-scene data was not intended to be so complex. This and its successor should have appeared prior to "001".
This Visible Vignetting correction is very direct.
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