The problem of lip contour detection is critical in the lipreading systems based on contour processing. The typical contour detection strategy based on image segmentation in homogeneous regions fails in the case when the mouth images available for lipreading are lowcontrast gray level images. Most of the solutions adopted require manual marking of some contour points. Here we propose a new solu...

This paper proposes a method of implementation of automatic contour line extraction from scanned digital topographic maps. First, color image segmentation is executed to recognize the features on digital topographic maps, second, morphological and filtering operations are presented to eliminate all unwanted information from digital topographic map except from contour lines. Then, resolving the ...

In this paper, a regional minimal cost approach without parameters is used for contour tracking with a good robustness. Dynamic programming is exploited for its efficiency. This general method is applied to the extraction of the cranial contour on higth resolution X-Ray image. Ellipse is then fitted on the extracted contour to represent it as a first step for automatic localisation of cephalome...

In this paper, an improved method to extract the chin contour under different face poses is proposed. Several previous approaches have used active contour models(ACM) or snakes in front-view facial images. However, successful chin contour extraction for a wide range of face poses has seldom been mentioned. An algorithm based on an improved snake for chin contour extraction is presented here and...

This paper presents a novel method for the segmentation of partially overlapping convex shape objects in silhouette images. The proposed method involves two main steps: contour evidence extraction and contour estimation. Contour evidence extraction starts by recovering contour segments from a binarized image using concave contour point detection. The contour segments which belong to the same ob...

Tracking the 2D contour of a moving object has widely been used in the past years. So called active contour models have been proven to be a promising approach to real–time tracking of deformable objects. Also tracking 2D contours, which are projections of rigid 3D objects, is reduced to tracking deformable 2D contours. There, the deformations of the contour are caused by the movement in 3D and ...

In this paper we present a method for the statistical characterisation of melodic pitch contours, and apply it to automatic melody extraction from polyphonic music signals. Within the context of melody extraction, pitch contours represent time and frequency continuous sequences of pitch candidates out of which the melody must be selected. In previous studies we presented a melody extraction alg...

In this study, we developed an automatic extraction scheme for the precise recognition of the contours of masses on digital mammograms in order to improve a computer-aided diagnosis (CAD) system. We propose a radial-searching contour extraction method based on a modified active contour model (ACM). In this technique, after determining the central point of a mass by searching for the direction o...

Lip segmentation is an essential stage in many multimedia systems such as video-conferencing, lip reading, or low bit rate coding communication systems. It is also useful in various image / video acquisition devices encouraged the development of many computer vision applications, such as vision -based surveillance, vision based man machine interfaces, vision-based biometrics, and so on. Hence e...

Contour detection is part of a segmentation process. We describe a cornea contour detection approach on images from Optical Coherence Tomography (OCT). These scans present some noise due to the acquisition means. This causes the segmentation to be more difficult. OCT usually provides high-resolution images, but these pictures suffer from speckle. This multiplicative type of noise is common on s...