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Octave vs Matlab: regionprops differences

 From: Giorgio De Nunzio Subject: Octave vs Matlab: regionprops differences Date: Wed, 17 Jan 2018 20:36:50 +0100 User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.5.2

```Hi all,

```
please try this script in Matlab (with the image processing toolbox) and in octave (first loading the image package):
```
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% define a mask
BW = logical([1 1 1 0 0 0 0 0
1 1 1 0 1 1 0 0
1 1 1 0 1 1 0 0
1 1 1 0 0 0 1 0
1 1 1 0 0 0 1 0
1 1 1 0 0 0 1 0
1 1 1 0 0 1 1 0
1 1 1 0 0 0 0 0]);

L = bwlabel(BW, 8);   % ,4 or ,8 (default)
s = regionprops(L, 'Perimeter', 'Eccentricity')

for j = 1:size(s)
disp(s(j).Perimeter)
disp(s(j).Eccentricity)
end

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Here is the result, with connectivity = 4 or 8, and Matlab or octave:

Connectivity = 4, Matlab:

s =

3×1 struct array with fields:
Eccentricity
Perimeter

17.2760
0.9270
3.5560
0
7.0130
0.9315

Connectivity = 4,  octave

error: vertical dimensions mismatch (1x3 vs 1x2)
error: called from
regionprops>rp_perimeter at line 767 column 8
regionprops at line 412 column 26
testOctaveVSMatlab at line 13 column 3
>>

Connectivity = 8, Matlab

s =
2×1 struct array with fields:
Eccentricity
Perimeter

17.2760
0.9270
13.1080
0.9429

Connectivity = 8, octave

s =
2x1 struct array containing the fields:
Perimeter
Eccentricity

18
0.92702
14.243
0.98641
>>

```
As you see, with 4-connectivity, octave breaks. With 8-connectivity, perimeters and eccentricities are different.
```
Thanks

Giorgio

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