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How to increase or decrese graythresh value?

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Kim
Kim 2012-1-20
rgb=imread('image1.jpg');
Igray=rgb2gray(rgb);
Ibw = im2bw(Igray,graythresh(Igray));
imshow(Igray);

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Sukuchha
Sukuchha 2012-1-20
store graythresh(Igray) in a variable and increase/ descrease as u want!

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