Matlab image processing thresholding and implementing an equation in matlab

2017 11 3
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更新时间：2017 11 4
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Using equation P=(8/(i2-i1))*∑grad(i) to find a threshold where i1=0.1% i2=10% of total length of pixel indices. How do I implement this equ in matlab and what does i1,i2 mean and how can i find their value? How can i find the divergence of an image?

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Image Analyst
Image Analyst 2017-11-4

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Compute the cdf
[counts, bins] = histcounts(data);
theCDF = cumsum(counts);
theCDF = theCDF / theCDF(end);
i1 = find(theCDF > 0.001, 1, 'first');
i2 = find(theCDF > 0.1, 1, 'first');

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Nasser Jarrar
Nasser Jarrar 2017-11-4
I'm supposed to upload an image and process the function "histcounts" won't work with uint8. To be more clear I've uploaded the paper and the alogrithm i want to implement.

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