In this paper, we propose an object recognition method for 2D objects using wavelet descriptors. The descriptors are derived from the continuous wavelet transform using the Mexican hat function as mother wavelet. In contrast to the other known methods we apply an angle function to describe object contours extracted as polygons. The contour extraction is based on the object oriented contour extr...

An approach to symbolic contour extraction will be described that consists of three stages: enhancement, detection, and extraction of contours and corners. Contours and corners are enhanced by models of monkey cortical complex and endstopped cells. Detection of corners and local contour maxima is performed by selection of local maxima in both contour and corner enhanced images. These maxima for...

To improve the real-time performance of the level set algorithm for facial contour extraction in dynamic image sequence, a new facial contour extraction method is purposed in this paper which combines the level set and GM (1,1) model. With this method, firstly, the rough facial contour of a moving body is detected while it enters into the camera scope using the human motion information with the...

This paper addresses the problem of contour line extraction from scanned topographic maps in poor condition. A novel method is developed, using knowledge of cartography and graphics to extract contours by removing other layers which overlay the contours, and reconstructing the contour lines. The contributions of this paper are the supplementation of the use of knowledge discovery for extraction...

SLT on subject 1 (top) and 2 (bottom). Green line shows fiber skeleton extraction results from ACFSE and red shows fiber tractography from SLT. The active contour approach was able to generate the skeleton of cingulum. Fig. 2 (right). Results of ACFSE and SLT. From top to bottom, results are from 6 different volume data sets of subject 1 with 3 acquisitions. Green shows fiber skeleton extractio...

This paper presents a technique to segment and track a region of interest in a video sequence. The presented technique starts with a spatio-temporal contour extraction. This contour extraction is performed by mixing information from a spatial gradient and a temporal di erentiator. A block segmentation is then applied on the image, and within each block the contour part is approximated by a stra...

A Computational Geometry Approach toDigital Image Contour Extraction

This paper addresses the problem of automated extraction of constant valued elevation curves (isocontours) from 2dimensional (2D) images of historical maps. We present a new isocontour extraction method that can operate in a semi automatic or fully automatic mode. The novelty of the work is in developing an isocontour extraction technique for historical map analysis that is unique in the GIS ap...