comparing shapes: how to find the right one

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jenka 2012-8-30

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Hi everybody, I have the following problem. I have a true data set. Which is a binary matrix (0/1). If I do imagesc(true_data), it will show a shape. I also have multiple other binary matrices (shapes) that I am trying to compare to my true binary matrix. I need to find the one that best matches my truth. You can imagine that these shapes can be compared by pixels and the observing the pixels that match and that did not match. That however will not work. For example if my true shape is ellipsoid and I can produce two shapes that will have the same areas of intersection and non intersection yet one of them better represents the truth.

Here is the image: http://i47.tinypic.com/2mwi5na.jpg

I am trying to see which shape is a better match for my main one. Any suggestions? Thanks!

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Sean de Wolski 2012-8-30

编辑：Sean de Wolski 2012-8-30

Are the templates and images all the same size (e.g. an 8x8 octogon will be 8x8 in both images)?

jenka 2012-8-30

yes, the data comes in the binary matrix (100x100): all are the same size. The templates are of the same size (I think).Thanks in advance!!!

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Answer 1

Image Analyst 2012-8-31

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You can use morphometrics: http://en.wikipedia.org/wiki/Morphometrics

If you're lucky and have very simple shapes, then you can figure out which shape matches just based on area, perimeter, and/or the perimeter^2/(4*pi*area) ratio. If the shapes can be any arbitrary shape, and you will accept scaled sizes of the match, then you'll have to compare more things.