Counting Plotted Coordinates in image

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S. Sal
S. Sal 2016-12-13
回答： David J. Mack 2017-1-12
I have a gray scale image given below:
I plot blue dot on certain coordinates given in 2xN matrix and get the following:
Now i convert the image into patches like below:
Now i want to count these blue dots in each patch as well as in image 2. How do i do that ?

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回答（1 个）

David J. Mack
David J. Mack 2017-1-12
If you have your 2xN dot matrix dots which presumably contain the x (row 1) and y (row 2) coordinates, then N is the number of dots in the whole image and
ni = nnz(dots(1,:)>=xi & dots(1,:)<xi+wi) & dots(2,:)>=yi & dots(1,:)<yi+hi));
Gives you the number of dots in image patch i, which has its lower left corner at (xi,yi) and has a width x size of wi x hi.

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