Active contours and active shape models (ASM) have been widely employed in image segmentation. A major limitation of active contours, however, is in their (a) inability to resolve boundaries of intersecting objects and to (b) handle occlusion. Multiple overlapping objects are typically segmented out as a single object. On the other hand, ASMs are limited by point correspondence issues since obj...

We present results for an active contour that finds the pupil-iris border in slit lamp images of the eye. Preprocessing involves producing a variance image from the original image and then locating the annulus, of a given size, which has the lowest mean variance. The centre of this annulus falls inside the pupil, giving a starting position for a discrete circular active contour (DCAC). The DCAC...

Structures that can detect the shapes in images in a flexible manner are widely used today. Active contour model, which is one of these structures, is an important model. This model aims to surround the shape with points and to enable these points to fit into the shape. However, since Active Contour Model contains energy minimization, it requires long working time. Scaling based model developed...

In object segmentation by active contours, the initial contour is often required. Conventionally, the initial contour is provided by the user. This paper extends the conventional active contour model by incorporating feature matching in the formulation, which gives rise to a novel matching-constrained active contour. The numerical solution to the new optimization model provides an automated fra...

This paper presents the application of active contour or snake for the segmentation of masses on breast ultrasound images and the characterization of the segmented masses as malignant or benign. Initially, the balloon snake is chosen to segment the masses. Comparison on the masses areas segmented by the balloon snake is done against the areas traced by radiologist. Experimental result shows tha...