regionpros gives 0 area for a simple binary figure?

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!

Answer 1

[Matt J]

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

[Zilong He]

Thank you so much!!!