How to create a binary grating pattern with Matlab?

Hello Everyone,

I want to design several binary grating patterns with matlab. The matrix size is 1920*1080, the period is 4 pixels. The patterns have there direction angle, one is zero, the second is 2*pi/3, the last is 4*pi/3. I tried used square function, but the result is not correct. Does anyone know how to do this?

Thank you very much. Xiaolei

Answer 1

[Joseph Cheng]

Well... what you could do is do:

I = zeros(1920,1080);
cols = 0:1080-1;
I(:,find(mod(cols,4)<2))=1;

and then use imrotate to get your direction angle.

[Xiaolei]

Hello Joseph, Thank you very much, that's very helpful. But there is a problem when I use imrotate, the matrix will change. I just want the grating pattern direction change while keep the matrix still is 1920*1080. Another question is how can I change the phase of this pattern? Would you please give me some suggestions?

[Joseph Cheng]

My license for imageprocessing was taken up by someone else so i couldn't try. However reading the documentation it maybe a property that you can set within the imrotate function.