Counting the edge points of an image in Matlab

Question

I have detected the edge points of an image as shown in the following image:

then i have divided the image into different blocks of the same size as shown here:

Now what i want is to count the number of edge points in every image block.

Can someone please let me know how to do that

your assistance is much appreciated

Answer 1

assuming that by the edge points you mean white pixels, on black backround, you can do something along these lines:

   % some random block, simulating your case
>> a_blk = rand(10,5)-0.5;
   % edge pixels are greater than 0 (as a assume).
>> sum(sum(a_blk>0))