matthiasm@8: function img = imresizeAspect(img, maxSize)
matthiasm@8: % function img = imresizeAspect(img, maxSize)
matthiasm@8: % If image is larger than max size, reduce size, preserving aspect ratio of input.
matthiasm@8: %
matthiasm@8: % If size(input) = [y x] and maxSize = [yy xx],
matthiasm@8: % then size(output) is given by the following (where a=y/x)
matthiasm@8: %  if y<yy & x<xx  then [y x] 
matthiasm@8: %  else if a<1 then [a*xx xx] 
matthiasm@8: %  else [yy yy/a] 
matthiasm@8: 
matthiasm@8: % For why we use bilinear,
matthiasm@8: % See http://nickyguides.digital-digest.com/bilinear-vs-bicubic.htm
matthiasm@8: 
matthiasm@8: if isempty(maxSize), return; end
matthiasm@8: 
matthiasm@8: [y x c] = size(img);
matthiasm@8: a= y/x;
matthiasm@8: yy = maxSize(1); xx = maxSize(2); 
matthiasm@8: if y <= yy & x <= xx
matthiasm@8:   % no-op
matthiasm@8: else
matthiasm@8:   if a < 1
matthiasm@8:     img = imresize(img, ceil([a*xx xx]), 'bilinear');
matthiasm@8:   else
matthiasm@8:     img = imresize(img, ceil([yy yy/a]), 'bilinear');
matthiasm@8:   end
matthiasm@8:   fprintf('resizing from %dx%d to %dx%d\n', y, x, size(img,1), size(img,2));
matthiasm@8: end
matthiasm@8: 
matthiasm@8: 
matthiasm@8: %test
matthiasm@8: if 0
matthiasm@8:   maxSize = [240 320];
matthiasm@8:   %img = imread('C:\Images\Wearables\web_static_office\8.jpg'); 
matthiasm@8:   %img = imread('C:\Images\Wearables\web_static_office\billandkirsten.jpg'); 
matthiasm@8:   %img = imread('C:\Images\Wearables\web_static_street_april\p5.jpg'); 
matthiasm@8:   img = imread('C:\Images\Wearables\Database_static_street\art11.jpg'); 
matthiasm@8:   img2 = imresizeAspect(img, maxSize);
matthiasm@8:   figure(1); clf; imshow(img)
matthiasm@8:   figure(2); clf; imshow(img2)
matthiasm@8:   fprintf('%dx%d (%5.3f) to %dx%d (%5.3f)\n', ...
matthiasm@8: 	  size(img,1), size(img,2), size(img,1)/size(img,2), ...
matthiasm@8: 	  size(img2,1), size(img2,2), size(img2,1)/size(img2,2));
matthiasm@8: end