Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9893104 | Microvascular Research | 2005 | 14 Pages |
Abstract
Vessels are modeled using a family of super-Gaussian functions that are based on the superquadric modeling primitive common in computer vision. The superquadric generalizes a simple ellipsoid by including shape parameters that allow it to approximate a cylinder with elliptical cross-sections (generalized cylinder). The super-Gaussian is obtained by composing a superquadric with an exponential function giving a form that is similar to a standard Gaussian function but with the ability to produce level sets that approximate generalized cylinders. Importantly, the super-Gaussian is continuous and differentiable so it can be fit to image data using robust non-linear regression. This fitting enables quantification of the intrinsic complexity of vessel data vis-a-vis the super-Gaussian model within a minimum message length (MML) framework. The resulting measures are expressed in units of information (bits). Synthetic and real-data examples are provided to illustrate the proposed measures.
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Authors
James A. Tyrrell, Vijay Mahadevan, Ricky T. Tong, Edward B. Brown, Rakesh K. Jain, Badrinath Roysam,