scaled Otsu Binarization or Normalized?

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Muhammad Shoaib
Muhammad Shoaib 2015-11-25
回答： Guillaume 2015-11-25
I have binarized an image using graythresh, I want to know by using graythresh, dividing and multiplying the original values by maximum values, is this binarization method called scaled or normalized Otsu.
im = imread('flower.jpg');
max_level = double(max(im(:)));
min_level = double(min(im(:)));
lev = graythresh(double(im)/max_level) * max_level;
bw = (im>=lev);

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Guillaume
Guillaume 2015-11-25
By dividing your original image by the max, you're just normalising the image to the range [0 1]. This has nothing to do with Otsu's method.
That you then scale the level returned by graythresh to the range of your image is normal procedure. This is just plain Otsu thresholding.
So what you've done is threshold a normalised image using Otsu's method. There's no special name for this.

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