[R] shapes of woodpeckers' cavities

[Violette BERTRAND]

Hi,

I have pictures (.png) of the shape of many entrances of woodpeckers’ cavities, coloured in black. I want that R takes these pictures and stacks (superimposes) all the shapes to determine the tendency of the shape of cavities for each species of woodpecker. 

I currently use the package EBImage which determine the mean radius of the shape of entrances (the shape is divided in 8 parts, and the package measure the mean radius for each part). So this package uses only the mean radius for each part of the shape.

But, I would like that R use the real shape of cavities. Is another package exists, which will use the real shape of my pictures ?



Thanks,
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