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function Is = read_imgs(homedir,imgdir,prename,postname,digits,startid,endid,step_img)
%
% Is = read_imgs(homedir,imgdir,prename,postname,digits,startid,endid,step_img)
%
command = ['%s%s%s%.',num2str(digits),'d%s'];
fname = sprintf(command,homedir,imgdir,prename,startid,postname);
disp(fname);
if (strcmp('.ppm',postname)),
I1 = readppm(fname);
else
I1 = imread(fname);
end
Is = zeros(size(I1,1),size(I1,2),size(I1,3),1+floor((endid-startid)/step_img));
Is(:,:,:,1) = I1;
im_id = 1;
for j = startid+step_img:step_img:endid,
command = ['%s%s%s%.',num2str(digits),'d%s'];
fname = sprintf(command,homedir,imgdir,prename,j,postname);
disp(fname);
im_id = im_id+1;
if (strcmp('.ppm',postname)),
Is(:,:,:,im_id) = readppm(fname);
else
a = imread(fname);
Is(:,:,:,im_id) = a;
end
end
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