In this system we improved the performance of an automatic system for extracting leaf contour. The proposed leaf contour extraction method consists of three major procedures: the detection of four edge points, and contour tracing. Leaf detection includes two stages: feature extraction and matching. For the leaf contour extraction part, we present a new technique for automatically identifying th...

In this paper, we present a new method of velocity eld estimation for the points on the moving contours in a 2-D image sequence. The method decides the corresponding point in the next image frame by considering the curvature change of the given point on the contour. In the traditional methods, there are optical ow errors for the points which have narrow local curvature variations since those me...

Existing quantitative calculations of material transport across the stratospheric polar vortex edge are difficult to interpret. This is because what is actually calculated has not been clearly shown to be irreversible transport, because of ambiguities inherent in defining the vortex edge, and (relatedly) because the uncertainties in the various sorts of calculations have not been quantified. Th...

This paper proposes a novel method for extraction of eyebrow contour and chin contour. We first segment rough eyebrow regions using spatial constrained sub-area K-means clustering. Then eyebrow contours are extracted by Snake method with effective image force. For chin contour extraction, we first estimate several possible chin locations which are used to build a number of curves as chin contou...

The lack of information about the tangential velocity makes the velocity estimation erroneous in contour matching. Classical methods use the normal velocity, together with some smoothness constraints, since the tangential velocity cannot be recovered. This paper presents a contour matching method that computes displacements with a criteria of minimum curvature diierences. The rst derivative of ...

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...

This paper presents the recognition of shapes for object retrieval in image databases using skeleton-based and contour-based representation by discrete curve evaluation and two consecutive primitive edges. Humans tend to use high-level concepts in everyday life. Object segmentation and recognition is the primary step of computer vision to achieve image retrieval of high-level image analysis. Co...

In this paper, we discuss the problem of recovering a star-shaped contour with the assumption that the contour coordinates can be decomposed into damped sinusoids. We propose a signal generation method derived from the array processing paradigm, which yields the center and radius of a circle fitting the contour. Starting from an initialization circle, we propose to estimate the oscillations of ...

A new boundary contour extraction algorithm based on curve evolution model and ant colony algorithm is proposed in this paper. Firstly, ant colony algorithm is used to find the optima of snake points for rapidly converging near image edge. Then the interpolation algorithm is applied to gaining the object’s rough contour that is used as the initial zero level set. The accurate contour can be obt...

A new method for tracking outer lip contours of individuals in real world conditions is presented. For an arbitrary speaker, lip color properties are learned for the Bayes decision from the current image frame using the nose tip location as a reference point. Estimated outer contour data is fit to an ellipsoid for further eliminating the effect of outliers in the contour. The algorithm, which i...