How can i calculate over segmentation and under segmentation

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rahul verma 2017-2-23

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https://ww2.mathworks.cn/matlabcentral/answers/326561-how-can-i-calculate-over-segmentation-and-under-segmentation

评论： Rik 2017-2-27

i am working on image-segmentation, now i have to calculate over and under segmentation percentage of my result. can anyone please help me how to calculate these ?

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rahul verma 2017-2-24

编辑：rahul verma 2017-2-24

Can't i do like this !! by calculating volume,

Vauto = regionprops(Mask, 'Area'); Vmanual = regionprops(groundTruth, 'Area');

where Vauto - volume of My code segmented image. Vmanual = volume of groundTruth image.

even i am trying to do this but i am getting error saying

_______________________Error_______________

Undefined function 'mldivide' for input arguments of type 'struct'.

Error in Over_Under_Seg (line 13) overSegmentation = ((Vauto\Vmanual)\Vmanual);

Rik 2017-2-27

在 MATLAB Online 中打开

You are trying to divide two struct, which is not possible. Furthermore, you are aware that you are using after-division? The difference is 1/3=0.3333 and 1\3=3.

If you refuse to use my code, you can use regionprops, but you should still extract the area from the struct. So your line should look like

overSegmentation = ((Vauto.Area\Vmanual.Area)\Vmanual.Area);

This line will only work if there is only a single connected mass in your image.

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