In this paper we describe a new approach to contour extraction and tracking, which is based on the principles of active contour models and overcomes its shortcomings. We formally introduce active rays, describe the contour extraction as an energy minimization problem and discuss what active contours and active rays have in common. The main diierence is that for active rays a unique ordering of ...

In this paper we describe a new approach to contour extraction and tracking, which is based on the principles of active contour models and overcomes its shortcomings. We formally introduce active rays, describe the contour extraction as an energy minimization problem and discuss what active contours and active rays have in common. The main diierence is that for active rays a unique ordering of ...

Active contour models present a robust segmentation approach which make efficient use of specific information about objects in the input data rather than processing all the data. They have been widely used in many applications including image segmentation, object boundary localisation, motion tracking, shape modelling, stereo matching and object reconstruction. In this paper, we investigate the...

In this note, we analyze the geometric active contour models proposed in 10, 31] from a curve evolution point of view and propose some modiications based on gradient ows relative to certain new metrics. This leads to a novel snake paradigm in which the feature of interest may be considered to lie at the bottom of a potential well. Thus the snake is attracted very naturally and eeciently to the ...

Breast cancer is one of the most common diseases diagnosed among female cancer patients. Early detection of breast cancer is needed to reduce the risk of fatality of this disease as no cure has been found yet for this illness. This research is conducted to improve the Gradient Vector Flow (GVF) Snake Active Contour segmentation technique in mammography segmentation. Segmentation of the mammogra...

The following section gives a brief overview of the Computer Tomography (CT) and Magnetic Resonance (MR) imaging modalities. This is followed by a section introducing active contour models, or snakes. The adopted active contour model is then detailed, followed by a breakdown of the work undertaken in developing this for CT and MR images. The document finishes with a few conclusions that can be ...