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# Distinguish between round and other binary objects

- Authors
- tesar-tech

This is a continuation from previous post that is about processing of image with shapes.

```
reg_props2 = regionprops(Aa{6},'perimeter','EquivDiameter','area');
[~,L] = bwboundaries(Aa{6},'noholes');% marking regions by numbers from 1:num_of_regions
%circle objects on the image are not perfectly round. Looking for "almost" round objects
%EquivDiameter is diameter for circle with same Area as object.
%Area/Perimeter + smallConstant > EquivDiameter/4 for round objects
%round objects (circles) have topmost Area/perimeter ration from all objects.
% Area/Perimeter = Diameter/4 for circles
where_is_true =([reg_props2.Area] ./ [reg_props2.Perimeter]+1) > [reg_props2.EquivDiameter]/4;
Aa{7} = ismember(L, find(where_is_true));
montage({Aa{6},Aa{7}},'bordersize',[1 1],'backgroundcolor','green')
```

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