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43 lines
1.2 KiB
Matlab
43 lines
1.2 KiB
Matlab
function [I,xcent,ycent]=image_popout_ellipses(gridsize,len,wid,spacing,angle,contrast,backgnd,jitter_pos,jitter_ang,surr_prob,cent_ellipse)
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%draw a uniform texture with a single element at a different orientation
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%and/or contrast
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if nargin<6, contrast=0.5*ones(size(angle)); end
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if nargin<7, backgnd=0.5; end
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if nargin<8, jitter_pos=0; end
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if nargin<9, jitter_ang=0; end
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if nargin<10, surr_prob=1; end
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if nargin<11, cent_ellipse=1; end
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[I,gridsize,xlocations,ylocations]=define_blank_image(gridsize,len,spacing,backgnd);
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circle=define_circle(len,wid);
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ellipse=define_ellipse(len,wid,1.5);
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a=0;
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for x=xlocations
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a=a+1;
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b=0;
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for y=ylocations
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b=b+1;
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xval=fix(x+(2*jitter_pos*rand)-jitter_pos);
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yval=fix(y+(2*jitter_pos*rand)-jitter_pos);
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angleval=angle+(2*jitter_ang*rand)-jitter_ang;
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if a==ceil(length(xlocations)/2) & b==ceil(length(ylocations)/2)
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if cent_ellipse
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I=draw_bar(I,xval,yval,ellipse,angleval(1)+90,contrast(1),backgnd);
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else
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I=draw_bar(I,xval,yval,circle,angleval(1),contrast(1),backgnd);
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end
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xcent=x;
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ycent=y;
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else
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if rand<=surr_prob
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if cent_ellipse
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I=draw_bar(I,xval,yval,circle,angleval(2),contrast(2),backgnd);
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else
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I=draw_bar(I,xval,yval,ellipse,angleval(2)+90,contrast(2),backgnd);
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end
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end
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end
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end
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end
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