HUNTER REEVE UNDERHILL, M.D.
Medical Practice at Pacific St, Seattle, WA

2007026, Nov 22, 2007

Mar 22, 2007

11/690063

William Kerwin - Seattle WA, US
Hunter Underhill - Seattle WA, US

G06K 9/00

382128000

A conditional active shape model wherein a training set of images of objects in a class of objects to be identified, such as vascular cross-sections, is supplemented with training observations of at least one second characteristic of the object. A conditional mean shape of the objects is calculated, conditioned on the second characteristic, thereby reducing the size of the probable search space for the shape. A conditional covariance matrix of the shapes is calculated, conditioned on the second characteristic, and the eigenvectors of the conditional covariance matrix corresponding to largest eigenvalues are calculated. The conditional mean shape, and the eigenvalues and eigenvectors of the conditional covariance matrix are then used in an active shape model to identify the shapes of objects in subsequent images.