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function I=crop_image(I)
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s=max(abs(I-0.5));
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b_start=min(find(s>0));
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b_end=max(find(s>0));
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s=max(abs(I'-0.5));
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a_start=min(find(s>0));
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a_end=max(find(s>0));
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I=I(a_start:a_end,b_start:b_end); |