MATLAB: ‘perimeter’ function giving error

MATLABperimeterpolyshape

I am getting an error when I run the example code for 'perimeter(polyin)'.

Here is the example code I open in matlab: openExample('matlab/PerimeterofPolygonExample')

I get the error: Function 'subsindex' is not defined for values of class 'polyshape'.

Anyone know why? Is there a toolbox I need to download to use this?

Best Answer

You've created a variable named perimeter. Rename or delete that variable.

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MATLAB: The ‘Perimeter’ option in regionprops()

No, it should be fine. I believe it's talking about a very special/rare situation where you have blobs that are disconnected but you want to treat them as one blob. Like your image has 5 blobs but for some reason you wanted to treat them all as one region. You can do that but some measurements, might not make sense. I believe what you want to do is to treat all 5 blobs as separate regions and get 5 perimeters and it will work fine for that

props = regionprops(binaryImage, 'Perimeter');  % returns a structure array.
allPerimeters = [props.Perimeter]

MATLAB: Does bwperim give wrong perimeter

The circle you are trying to measure is not a perfect circle, so technically you can't use 2*pi*radius as the formula for perimeter. Moreover, even what bwperim returns is an approximation that is dependent on the connectivity used, the resolution of the image and how perimeters of small line segments in the binary image are computed.

I would continue using bwperim.

Best Answer

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MATLAB: The ‘Perimeter’ option in regionprops()

MATLAB: Does bwperim give wrong perimeter

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