Assigning white pixels to specific locations

Say that we have a black image (i.e. zeros) of size 64x64, and say that I want to fill those 3x3 windows pixels in the middle of the image with white (i.e. ones), how can I do that in MATLAB?

Thanks.

Answer 1

[Tapan]

I = zeros(64); I(32:35,32:35)=1;

[Jan]

32:35 are 4 pixels... I assume the OP can apply the required changes.