how to change the value of Neighbour pixels

hello,

i wonder how can i change the value of Neighbour pixels around specific point without using massive loop..?

for example:

i have binary image and i want to remove (change the value of the pixel) an area of 5x5 pixels around specific point (x,y). i.e

is there any easy way to do this?

1 1 1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 1 1 1

i want to the pixels in the range of 3x3 matrix around the point i,j=(3,5) will turn zero's

1 1 1 1 1 1 1 1 1 1

1 1 1 0 0 0 1 1 1 1

1 1 1 0 1 0 1 1 1 1

1 1 1 0 0 0 1 1 1 1

1 1 1 1 1 1 1 1 1 1

[Image Analyst]

3 by 3 is a massive loop????

Answer 1

[Iain]

 map = false(size(image_to_mod));
 map(down,along) = true;
 dmap = imdilate(map,true(3,3));
 change = xor(map,dmap);
 image_to_mod(change) = false;

Answer 2

[Image Analyst]

% Create original binary image.
binaryImage = true(5, 10)
% Assign ring of false
binaryImage(2:4, 4:6) = [false, false, false; false, true, false; false, false, false]