In the world, Diabetic Retinopathy is the leading cause of vision loss. Early symptoms of this disease are exudates, so early diagnosis and treatment at right time is very important to prevent blindness. In this paper the Active contour model (ACM) is implemented to detect exudates and it is used to obtain accurate borders of lesions, and then the local features of detected exudates are extract...

alveolar ridge resorption has long been considered an unavoidable consequence of tooth extraction. while the extent and pattern of resorption is variable among individuals, there is a progressive loss of ridge contour as a result of physiologic bone remodeling. even today, with best modalities of tooth preservation, there is a group of elderly individuals who do not benefit from modern preventiv...

A Bayesian Model (BM) is proposed in this paper for extracting facial features. In the BM, first the prior distribution of object shapes, which reflects the global shape variations of the object contour, is estimated from the sample data. This distribution is then utilized to constrain and dynamically adjust the prototype contour in the matching procedure, in this way large or global shape defo...

Contour trees are extensively used in scalar field analysis. The contour tree is a data structure that tracks the evolution of level set topology in a scalar field. Scalar fields are typically available as samples at vertices of a mesh and are linearly interpolated within each cell of the mesh. A more suitable way of representing scalar fields, especially when a smoother function needs to be mo...

While recent approaches to automatic voice melody transcription of accompanied flamenco singing give promising results regarding pitch accuracy, mistakenly transcribed guitar sections represent a major limitation for the obtained overall precision. With the aim of reducing the amount of false positives in the voicing detection, we propose a fundamental frequency contour estimation method which ...

The process of generating an F0 contour has been modeled quite accurately in mathematical terms by Fujisaki and his coworkers, but the derivation of the underlying commands from an observed F0 contour is an inverse problem that cannot be solved analytically. Although it can be solved by successive approximation, a good first-order approximation is necessary to guarantee an efficient and accurat...

Self Organizing Maps (SOMs) have attracted the attention of many computer vision scientists, particularly when dealing with image segmentation as a contour extraction problem. The idea of utilizing the prototypes (weights) of a SOM to model an evolving contour has produced a new class of Active Contour Models (ACM s), known as SOM based ACM s. Such models have been proposed in general with the ...

In this paper, a novel profile verification scheme based on the ear, contour lines and feature points from head profile images is proposed. From the side image of a human head taken by a CCD camera, the contour line of the image is extracted by the simple filling method and morphological filtering. Based on the reference coordinate set by using ear images enrolled in the database a priori, the ...

We present a novel method for the incorporation of shape information into active contour models, and apply it to the extraction of line networks (e.g. road, water) from satellite imagery. The method is based on a new class of contour energies. These energies are quadratic on the space of one-chains in the image, as opposed to classical energies, which are linear. They can be expressed as double...