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38 lines
1.0 KiB
Matlab
38 lines
1.0 KiB
Matlab
function I=image_cross_orientation_square(sz,wavel,width,angle,diff,contrast)
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% sz = the diameter of the image
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% wavel = the wavelength of the square wave (pixels)
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% width = the width of the square wave
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% angle = angle of the principle grating
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% diff = angle between the gratings
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% contrast = contrast of mask grating
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freq=2*pi./wavel;
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angle=-angle*pi/180;
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diff=-diff*pi/180;
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%define image size
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if mod(sz,2)==0, sz=sz+1;end %image has odd dimension
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I=zeros(sz);
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%define mesh on which to draw sinusoids
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[x y]=meshgrid(-fix(sz/2):fix(sz/2),fix(-sz/2):fix(sz/2));
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yr=-x*sin(angle)+y*cos(angle);
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yc=-x*sin(angle+diff)+y*cos(angle+diff);
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%make sinusoids with values ranging from 0 to 1 (i.e. contrast is positive)
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grating=0.5+0.5.*cos(freq*yr);
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cross=0.5+0.5.*cos(freq*yc);
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%use sinusoids to make square waves
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thres=0.5+0.5.*cos(freq*(width./2));
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grating(find(grating<thres))=0;
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cross(find(cross<thres))=0;
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%grating(find(grating>=thres))=1;
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%cross(find(cross>=thres))=1;
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cross=contrast.*cross;
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%put togeter image from components
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I=grating+cross;
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I=min(I,1);
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%I=I.*0.5;
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