pixel Segmentation using histograms
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Hi, I am facing with a theoretical confusion and I hope some one can clear it up for me.
Is it possible to find gradients on the basis of a simple histogram?
I came across a mention of an algorithm which finds gradients on the basis of highest peaks of a histogram but I wasn't able to find it on web even after much searching.
Can someone please point me in the right direction if any of you have any idea regarding this? I shall be extremly grateful.
Thanks
Mehwish
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Image Analyst
on 28 Aug 2013
Not in general, though with fancier algorithms you can find some gradients (edges). For example using the range filter in the Image Processing Toolbox:
I = imread('liftingbody.png');
J = rangefilt(I);
imshow(I), figure, imshow(J);
or using stdfilt() or graycomatrix(). But these are a little more complicated than a simple global histogram of the whole image.
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Mehwish
on 28 Aug 2013
Edited: Mehwish
on 28 Aug 2013
2 Comments
Image Analyst
on 28 Aug 2013
darkPixels = J < 150; % or whatever.
I(darkPixels) = 255; % Set dark pixels to white in the original image.
imshow(I);
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