Counting overlapping pixels between two images

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I'm looking to find the number of overlapping shaded pixels between two images. The two images are attached. How could I count the overlapping shaded red pixels between the two images? Any assistance would be much appreciated. If possible an easily repeatable process, as I have to run it with 64 images.

Accepted Answer

Image Analyst
Image Analyst on 18 Jul 2014
Call imregister to align them. Then use min() to take the min values of the two images.
By the way, I'll be soon leaving for canoe camping over the weekend so good luck. I'll be back Sunday afternoon.
  11 Comments
mohamed seliga
mohamed seliga on 28 Dec 2020
I want the code that defines the green points on the mask, and calculates the overlap between the area that is common to both the green and red outlines regions, the code that I have specifies the red line only on the image
Image Analyst
Image Analyst on 29 Dec 2020
Edited: Image Analyst on 29 Dec 2020
Well just do something similar to get the green line. I'm not sure what is different - maybe a different parameter at some point in your algorithm. Then you can get the mask for each and AND them:
[rows, columns, numberOfColorChannels] = size(yourImage);
redMask = poly2mask(xRed, yRed, rows, columns];
greenMask = poly2mask(xGreen, yGreen, rows, columns];
overlap = redMask & greenMask;
overlapArea = nnz(overlap);
Again, let's take this to a different thread, so we don't keep sending Matthew emails about new activity in his 6 year old question. You can reply here ONCE again, ONLY to put the link to your new question.

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