Active shape model: Difference between revisions

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{{Short description|Statistical model of an object's shape}}'''Active shape models''' ('''ASMs)''') are [[statistical model]]s of the [[shape]] of objects which iteratively deform to fit to an example of the object in a new image, developed by Tim Cootes and Chris Taylor in 1995.<ref name=Cootes>{{cite journal| author=T.F. Cootes and C.J. Taylor and D.H. Cooper and J. Graham| title=Active shape models - their training and application| journal=Computer Vision and Image Understanding| pages=38–59| year=1995| issue=61}} [httphttps://wwwdoi.csorg/10.ualberta1006/cviu.ca/~nray1/CMPUT615/Snake/cootes_cviu951995.pdf1004]</ref> The shapes are constrained by the PDM ([[point distribution model]]) [[Statistical Shape Model]] to vary only in ways seen in a training set of labelled examples.

The shape of an object is represented by a set of points (controlled by the shape model). The ASM algorithm aims to match the model to a new image.

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The technique has been widely used to analyse images of faces, mechanical assemblies and medical images (in 2D and 3D).

It is closely related to the [[active appearance model]]. It is also known as a “Smart"Smart Snakes”Snakes"<ref name=Cootes/> method, since it is an analog to an [[active contour model]] which would respect explicit shape constraints.

==See also==

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==External links==

* [http://www.mathworks.com/matlabcentral/fileexchange/26706-active-shape-model-asm Matlab code] open-source ASM implementation.

* [https://web.archive.org/web/20060706184806/http://www.isbe.man.ac.uk/~bim//Models/index.html Description] of AAMs from Manchester University.

* [http://personalpages.manchester.ac.uk/staff/timothy.f.cootes/ Tim Cootes'] home page (one of the original co-inventors of ASMs).

* [http://www.milbo.users.sonic.net/stasm Source code] for ASMs (the "stasm" library).