Active Shape Model

Active Shape Models (ASM ) is a technology developed by Cootes and Taylor method of image processing.

They are an extension to the Snakes of Kass, Witkin and Terzopoulos, which is why they are also called "Smart Snakes ".

ASM represent a model as a set of connected points. These points describe, for example, the outline of a specific object. From training images an average of the object contours or shapes will be generated. Also can be derived from the training images, the way in which the shapes may change.

If you have created a model and wants to find a specific object in an image, the average shape is only placed on the image. Then the points of the model are drawn iteratively edges in the image.

The method was later extended to "Active Appearance Models " (AAM ). AAM consider not only the outline of an object, but also the average gray value distribution within the object boundaries.

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