How to measure the mean contrast of edge pixels?

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Krishna Chaitanya 2020-1-24

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https://ww2.mathworks.cn/matlabcentral/answers/501860-how-to-measure-the-mean-contrast-of-edge-pixels

编辑： KALYAN ACHARJYA 2020-1-28

I need to find the mean contrast of edge pixels and standard deviation of edge pixels.

I came across this definition but I didn't understand that

where A is the 8 neighboring pixels of current pixel with high intensity and B is the remaining 8 neighboring pixels of the A, numA is the number of pixels in A.

Can somebody help me in implementing this?

Thank you.

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KALYAN ACHARJYA 2020-1-25

Is it edge boundary or edges within the image?

Krishna Chaitanya 2020-1-26

There are some white regions within a binary image and I have to find the mean contrast for every such white region in the image.

I don't know whether it is edge boundary or edges within the image.

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Answer 1

KALYAN ACHARJYA 2020-1-25

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在 MATLAB Online 中打开

image is a gray scale image.

th=128; %considering unit8 image having range 0-255, you can decide or calculate 
data=image>=th;
data1=uint8(data).*image;
imag_high=sum(data1(:))/sum(data(:));
data2=uint8(~data).*image;
image_low=sum(data2(:))/sum(~data(:));
c=imag_high-image_low;