Sample patches from a image

There is a 128*128 image which has to be sampled into 32*32 image patches such that the distance(horizontal and vertical) between adjacent patches' centers is 3 pixels.

How do i find the center of a 32*32 matrix?

Can U give code?

Many thanks

Answer 1

[Image Analyst]

Well it would be at 16.5 pixels, but you don't need that at all. If the centers, wherever they may be, are 3 pixels apart, then so are the left sides, right sides, top edges, and bottom edges, so your left edges would be at 1,4,7,10,13, etc.

for col = 1:3:128
  for row = 1:3:128
    subMatrix = fullMatrix(row:row+31, col:col+31);
  end
end

[shantanu]

I get error for index not matching matrix dimensions

[shantanu]

Instead of 128 it should be 97

[shantanu]

thanx