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.

Solution Stats

47.62% Correct | 52.38% Incorrect
Last Solution submitted on Apr 08, 2024

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers11

Suggested Problems

More from this Author296

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!