regionpros gives 0 area for a simple binary figure?

Question

Zilong He 2020-10-8

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https://ww2.mathworks.cn/matlabcentral/answers/607891-regionpros-gives-0-area-for-a-simple-binary-figure

评论： Zilong He 2020-10-8

采纳的回答： Matt J

oribw.zip

在 MATLAB Online 中打开

I have a very simple bw as shown below. But the regionprops gives me lots of 0 area. Code is here

bwnew = imread('oribw.tif');
r_ori = regionprops(bwnew,'boundingbox','area');

The results are shown above. I have all zeros except for the final one. Does any one know why this happens? The original BW is attached as a zip since I could not upload TIF file. Thanks!

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Answer 1

Matt J 2020-10-8

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https://ww2.mathworks.cn/matlabcentral/answers/607891-regionpros-gives-0-area-for-a-simple-binary-figure#answer_508191

编辑：Matt J 2020-10-8

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Your bwnew needs to be of type logical, otherwise it gets treated as a label image.

>> T = regionprops('table',logical(bwnew),'boundingbox','area')
T =
  2×2 table
    Area              BoundingBox           
    ____    ________________________________
    2583    312.5    509.5       58       56
    2579    812.5    501.5       57       58