In this paper we present a method based on the fuzzy Hough transform to locate the iliac crests in posteroanterior radiographs. Firstly, a Canny edge detector is applied to the X-ray images in order to obtain an edge map. Then, the fuzzy Hough transform is used in combination with several constraints extracted from our domain knowledge. At the bottom of the radiograph we search for two circular...

In this paper, we present a technique for grouping line segments into convex sets, where the line segments are obtained by linking edges obtained from the Canny edge detector. The novelty of the approach is twofold: first we define an efficient approach for testing the global convexity criterion, and second, we develop an optimal search based on dynamic programming for grouping the line segment...

Edge identification is one of the key issues of computerized picture, in this paper, we might examine different systems for edge location and should expand and think about every one of them. There will be some scientific morphology technique and a few traditional edge recognition administrators are checked on. This paper gives strategies, for example, Canny administrator and scientific morpholo...

A modified ant-based edge detector is presented. It is based on the distribution of ants on an image. Ants try to find possible edges by using a heuristic function based on 3x3 ideal edge structures. Visual comparisons show that the modified algorithm gives finer details and thinner edges at lesser computational times when compared to earlier ant-based approaches. When compared to standard edge...

The Canny edge detector is widely used in computer vision to locate sharp intensity changes and to nd object boundaries in an image The Canny edge detector classi es a pixel as an edge if the gradient magnitude of the pixel is larger than those of pixels at both its sides in the direction of maximum intensity change In this paper we will show that de ning edges in this manner causes some obviou...

In this paper, the performance of a Gabor odd filterbased edge detector is investigated using the measures proposed b y Canny. Based on this performance analysis a design criterion for 1-D Gabor filter-based edge detector is derived. It is shown that this design criterion holds good for a 2-0 Gabor filter-based edge detector as well. Experimental results are presented to demonstrate the signifi...

The REVgraph is built up from our stereo processing system, TINA!. This system runs a Canny edge detector over both images, finds disparity values for the edge points using the PMF stereo correspondence algorithrn'' groups up the points into edge segments, and produces a geometric description of these edge segments in terms of straight linesand circular arcs'. The REVgraph contains representati...

Methods have been used for identification of human by recognizing lip prints. Human lips have a number of elevation and depressions features called lip prints and examination of lip prints is referred to as cheiloscopy. Lip prints of each human being are unique in nature like many others features of human. In this paper lip print is first smoothened using a Gaussian Filter. Next Sobel Edge Dete...

It is not possible to have a fair evaluation of edge detectors as edges are usually presented with simple synthetic images or real images that entail lots of semantic objects. We propose to elaborate a human expertise of edge detection by looking at zooms of small areas and to let humans build reference maps manually. Then it is possible to evaluate edge detectors and to undertake a classiicati...

We study the method of Sun et al. for edge detection based on the Law of Universal Gravity. We analyze the effect of the substitution of the product operation by other triangular norms in the calculation of the gravitational forces. We treat edges as fuzzy sets for which membership degrees are extracted from the resulting gravitational force on each pixel. We consider several prototypical trian...