How to find four coordinates of inner rectangle?

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Ashwathy Dev 2015-2-3

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https://ww2.mathworks.cn/matlabcentral/answers/174837-how-to-find-four-coordinates-of-inner-rectangle

评论： Image Analyst 2015-2-4

采纳的回答： Michael Haderlein

How to find the four inner coordinates of the white rectangle in matlab?

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Michael Haderlein 2015-2-3

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https://ww2.mathworks.cn/matlabcentral/answers/174837-how-to-find-four-coordinates-of-inner-rectangle#answer_166810

编辑：Michael Haderlein 2015-2-3

在 MATLAB Online 中打开

vsum=sum(image,1);
hsum=sum(image,2);
top=find(vsum,1,'first');
bottom=find(vsum,1,'last');
left=find(hsum,1,'first');
right=find(hsum,1,'last');

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Image Analyst 2015-2-4

Michael's reply moved from Ashwathyu's "Answer" to here:

So is the question still open? What exactly do you need anymore? If my answer doesn't work/fit/suffice, please tell us what exactly is the problem. If my answer is fine, please mark it as accepted. This way, nobody will waste time reading through questions which have already been answered.

Thanks!

Image Analyst 2015-2-4

Michael, your top/bottom is correct - nothing to switch/reverse. For images, like arrays, the top line is 1 and increases from there, so your formula for top will give the correct line (row) number.

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