This additional constraint is to highlight the changes in the boundary between two subsequent image layers by using the gray level difference value as a guide to indicate the movement needed by the upper image boundary curve in order to obtain the lower image boundary. This computer program was developed for another project of tracking the pig heart boundary of real time ultrasound video. In this method, an initial set of contour points is first selected, and then every contour point of the set evolves at a velocity in the normal direction of the contour at each iteration. In general the magnitude of the velocity is related to the curvature of the contour and local image features. In our study, the magnitude of the velocity is inversely proportional to the gradient.
Human intervention is needed to stop the process.
The resulting performance is related to the selection of the initial contour. In our effort to overcome these difficulties, we introduce a searching process to estimate the best velocity set at each iteration. A preliminary application of the resulting algorithm is reported in this paper. For curve and surface generation, a number of utilities are provided for generating high-quality curve and surface models directly from point data, from point data and curves, from curves alone, or from surface geometry. For entity analysis, utilities for verifying the quality of surfaces and curves are provided.