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how to find original intensity at retina image

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i want to find the intesity at original image by compare at image that i get. example: my original image is retina image and my second image is image from erosion operation.. then i want to compare the intensity at original image with my erosion image.
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Image Analyst
Image Analyst on 28 Mar 2016
What does "compare" mean to you? Do you simply want to subtract the images? I have no idea what result you would like to have.

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Accepted Answer

Walter Roberson
Walter Roberson on 28 Mar 2016
Selected_Intensities = Intensity_Image( logical(Erosion_Image) );
The result will be a vector of intensities of points that were non-zero in the erosion image.
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More Answers (1)

Image Analyst
Image Analyst on 28 Mar 2016
You can use beareaopen() to distinguish between larger hemorrhages and smaller microaneurysms.
sizeThreshold = 100; % Whatever size you want.
hemorrhages = bwareaopen(binaryImage, sizeThreshold); % Keep larger blobs.
microaneurysms = xor(binaryImage, hemorrhages); % Keep small blobs.

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