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How to Threshold Crop an Image for analysis

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Brian Peoples
Brian Peoples on 24 Jun 2020
Commented: Brian Peoples on 26 Jun 2020
Basically all I want to do is perform a lighting analysis on the hair itself in the border i set for it (blue tape). Is there a way I can crop this using some sort of color threshhold? the picture setup should be consistant everytime (i dont want to have to bother w imcrop(). Here is the image:

Accepted Answer

darova
darova on 25 Jun 2020
Maybe simple binarization?
I0 = imread('image.jpeg');
I1 = I0(:,:,3);
I2 = im2bw(I1,graythresh(I1)-0.1);
imshowpair(I0,I2,'montage')
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