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V1_Saliency/image_popout_circle_bars.m

48 lines
1.5 KiB
Matlab

function [I,xcent,ycent]=image_popout_circle_bars(gridsize,len,wid,spacing,angle,contrast,backgnd,jitter_pos,jitter_ang,surr_prob,cent_gap)
%draw a uniform texture with a single element at a different orientation
%and/or contrast
if nargin<6, contrast=0.5*ones(size(angle)); end
if nargin<7, backgnd=0.5; end
if nargin<8, jitter_pos=0; end
if nargin<9, jitter_ang=0; end
if nargin<10, surr_prob=1; end
if nargin<11, cent_gap=1; end
[I,gridsize,xlocations,ylocations]=define_blank_image(gridsize,len,spacing,backgnd);
circle=define_circle(len*2/3,wid);
bar=define_bar(len*2/3,wid);
blank=define_bar(len,wid).*0;
[a,b]=size(blank);
diam=size(circle,1);
circ_bar=draw_bar(blank,ceil(a/2),fix((diam-1)/2)+1,circle,0,1,0);
circ_bar=draw_bar(circ_bar,ceil(a/2),floor(2*b/3),bar,0,1,0);
circle=draw_bar(blank,ceil(a/2),fix((diam-1)/2)+1,circle,0,1,0);
a=0;
for x=xlocations
a=a+1;
b=0;
for y=ylocations
b=b+1;
xval=fix(x+(2*jitter_pos*rand)-jitter_pos);
yval=fix(y+(2*jitter_pos*rand)-jitter_pos);
angleval=angle+(2*jitter_ang*rand)-jitter_ang;
if a==ceil(length(xlocations)/2) & b==ceil(length(ylocations)/2)
if cent_gap
I=draw_bar(I,xval,yval,circ_bar,angleval(1),contrast(1),backgnd);
else
I=draw_bar(I,xval,yval,circle,angleval(1),contrast(1),backgnd);
end
xcent=x;
ycent=y;
else
if rand<=surr_prob
if cent_gap
I=draw_bar(I,xval,yval,circle,angleval(2),contrast(2),backgnd);
else
I=draw_bar(I,xval,yval,circ_bar,angleval(2),contrast(2),backgnd);
end
end
end
end
end