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wolffd@0
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1 function img = imresizeAspect(img, maxSize)
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2 % function img = imresizeAspect(img, maxSize)
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wolffd@0
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3 % If image is larger than max size, reduce size, preserving aspect ratio of input.
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4 %
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5 % If size(input) = [y x] and maxSize = [yy xx],
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6 % then size(output) is given by the following (where a=y/x)
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wolffd@0
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7 % if y<yy & x<xx then [y x]
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8 % else if a<1 then [a*xx xx]
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9 % else [yy yy/a]
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10
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11 % For why we use bilinear,
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12 % See http://nickyguides.digital-digest.com/bilinear-vs-bicubic.htm
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13
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14 if isempty(maxSize), return; end
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15
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16 [y x c] = size(img);
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17 a= y/x;
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18 yy = maxSize(1); xx = maxSize(2);
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19 if y <= yy & x <= xx
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wolffd@0
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20 % no-op
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21 else
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22 if a < 1
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23 img = imresize(img, ceil([a*xx xx]), 'bilinear');
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24 else
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25 img = imresize(img, ceil([yy yy/a]), 'bilinear');
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wolffd@0
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26 end
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27 fprintf('resizing from %dx%d to %dx%d\n', y, x, size(img,1), size(img,2));
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wolffd@0
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28 end
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29
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30
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31 %test
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32 if 0
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33 maxSize = [240 320];
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34 %img = imread('C:\Images\Wearables\web_static_office\8.jpg');
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35 %img = imread('C:\Images\Wearables\web_static_office\billandkirsten.jpg');
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36 %img = imread('C:\Images\Wearables\web_static_street_april\p5.jpg');
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37 img = imread('C:\Images\Wearables\Database_static_street\art11.jpg');
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wolffd@0
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38 img2 = imresizeAspect(img, maxSize);
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wolffd@0
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39 figure(1); clf; imshow(img)
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40 figure(2); clf; imshow(img2)
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wolffd@0
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41 fprintf('%dx%d (%5.3f) to %dx%d (%5.3f)\n', ...
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42 size(img,1), size(img,2), size(img,1)/size(img,2), ...
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wolffd@0
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43 size(img2,1), size(img2,2), size(img2,1)/size(img2,2));
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wolffd@0
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44 end
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