Fourier Domain of Binary image by binary mask

Hi Going over exam questions and was wondering if someone could guide me through this; I have a binary image B which is multiplied by a binary mask M, the resulting amplitude is B' I have to come up with 3 binary masks for the exam and describe what each corresponding B' would look like.

Would really appreciate if someone could help out or even point towards somewhere I can read up about it. Thanks :)

Answer 1

[Image Analyst]

Maybe start with a standard demo image supplied with MATLAB such as eight.tif or coins.png. Then threshold to get a binary image

binaryImage = grayImage > 128; % or whatever.

Then make up some maks, like a rectangle

mask = false(size(binaryImage);
mask(100:200, 100:300) = true;

Then multiply them with .*, not * so that you do an element-by-element multiplication. Use subplot(), imshow(), and title to display them all in one figure.

[Image Analyst]

And after that do whatever Fourier operations you wanted to do.