in the present paper axial distributions of plasma and floating potentials, electron and iondensities and eedf have been measured in the dl region of a hg discharge constriction. an attempt hasbeen made for the resolution of opposing charged layer structures in dl. excitation processes in theconstriction region are studied. using the linearization method for the nonstationary balance equationss...

The sipping of ink through the pages of certain double-sided handwritten documents after long periods of storage poses a serious problem to human readers or OCR systems. This paper addresses this problem through the recovery of content on the front side of a page from the interfering image caused by the handwriting on the reverse side. First, by adapting the Gaussian stochastic model, the inter...

The paper presents two techniques of image segmentation to facilitate image edge detection, that can be used further by image analysis based on the extracted features of image edges, Canny edge detection and Otsu thresholding are examples of the proposed techniques, the paper evaluates the effectiveness of the two methods with a variety of images, testing their suitability to natural as well as...

An algorithm for edge detection with low contrast image using improved ant colony optimization is proposed in this paper. In edge detection, some parts of the edge are disappeared or disconnected because of low contrast in their intensities. This paper concentrates to this low-contrast problem. To detect these pixels, the direction tendency of edge lines is computed and ant colony optimization ...

in this research, shock wave motion, shock/boundary layer interaction, and flow separation in a transonic flow over a naca0012 airfoil were investigated experimentally. thirteen kulite sensors were utilized for measurement of pressure fluctuations over the airfoil. experiments were performed for angles of attack between -4 to 4 degrees and flow mach numbers of m= 0.39 to 0.82. the kulite sensor...

Many corner detectors make use of edge detectors to extract edge points first. In this paper, we proposed a local edge detection algorithm that can be used well in corner detectors. Instead of marking edge points globally, we detect them locally based on both gradient magnitude threshold and gray level analysis. The process is dynamic and can provide correct edge points for detecting corners. T...

In Lianas and Lantaron, J. Sci. Comput. 46, 485-518 (2011) we proposed an algorithm (EDAS-<i) to approximate the jump discontinuity set of functions defined on subsets of R. This procedure is based on adaptive splitting of the domain of the function guided by the value of an average integral. The above study was limited to the ID and 2D versions of the algorithm. In this paper we address the th...

The Standard Hough Transform (SHT) is used to find lines, circles and other image features in edge maps containing edge points. Edge points which potentially can ‘vote’ for a given line (called its ‘line support’) are highly dependent of line position and orientation due to the boundedness of images. If accumulator array peaks are used to find lines then peripherally located lines are missed. U...

This paper presents a fast and accurate algorithm for extracting lines and circular arcs from digital images. Conventional line and circle extraction algorithms first extract the edge pixels and then connect these edge pixels into lines or circles. In contrast the proposed algorithm extracts the lines and circular arcs directly from the input image by tracing the perimeter of an intensity regio...

We have developed a compact CMOS motiondetection circuit based on a direction-selective neuralnetwork architecture. The circuit consists of asynchronous current-mode digital subcircuits for edge detection and subthreshold analog subcircuits for motiondetection. SPICE and numerical simulations of the network show that the circuit can successfully extract edge lines from incident images and compu...