In order to segment nucleus and cytoplasm of single cervical cell in the semear images accurately, a novel Gradient Vector Field (GVF) Snake is proposed by improving edge map of GVF Snake (PGVF) to enhance the capacity of the active contour model of gradient vector field to locate the boundary of nuclei and cytoplasmic. In our method, the image is converted into polar coordinates and the Sobel ...

Image segmentation for detection of vessel walls is necessary for quantitative assessment of vessel diseases by intravascular ultrasound. A new segmentation method based on gradient vector flow (GVF) snake model is proposed in this paper. The main characteristics of the proposed method include two aspects: one is that nonlinear filtering is performed on GVF field to reduce the critical points, ...

Abstract Five grapevine viruses, including geminivirus A (GGVA), Syrah virus 1 (GSyV-1), Cabernet Sauvignon reovirus (GCSV), F (GVF) and Red Globe (GRGV) have been detected in four South Australian vineyards using metagenomic high throughput sequencing for the first time Australia. Most of them were present asymptomatic grapevines some with leafroll disease that infected by several other leafro...

This article deals with the so called GVF (Gradient Vector Flow) introduced by C. Xu, J.L. Prince [14, 15]. We give existence and uniqueness results for the front propagation flow for boundary extraction that was initiated by Paragios, Mellina-Gottardo et Ralmesh [11, 12]. The model combines the geodesic active contour flow and the GVF to determine the geometric flow. The motion equation is con...

Finding shapes in image databases is a challenging topic in content based retrieval. In this paper the goal is to find database images which contain shapes similar to the query of the user. Unlike most solutions to this problem, the algorithm presented in this paper is meant to cope with changes in rotation, scale, translation, and lossy compression noise. A Java application was built which use...

The performance of the electric submersible pump (ESP) significantly affected by Gas Void Fraction (GVF). Thus, using of a Rotary Gas Separator (RGS) is a suitable solution for this issue. The performance of the RGS is function of different parameters such as geometry of impeller, rotating speed, boundary conditions, media viscosity and GVF. In this study, the influences of GVF, viscosity, ...

In this paper we propose an algorithm for pathfollowing control of the nonholonomic mobile robot based on the idea of the guiding vector field (GVF). The desired path may be an arbitrary smooth curve in its implicit form, that is, a level set of a predefined smooth function. Using this function and the robot’s kinematic model, we design a GVF, whose integral curves converge to the trajectory. A...

In this research, characterization of Discrete Cosine Transform (DCT) based Gradient Vector Flow (GVF) Active Contours as an efficient boundary mapping technique for chromosome spread images is done. Statistical testing validates the experimental results of characterization. Investigations on a different dataset are carried out to validate the characterized parameters and the parameters are sta...

Measurement of oil-gas two-phase flow parameters such as Gas Void Fraction (GVF) and phase distribution plays a vital role in oil gas industries. To quantitatively evaluate the performance Electrical Capacitance Tomography (ECT) for measuring complex dynamic flows, three-dimensional fluid dynamics-electrostatic field coupling model (3D-FECM) is proposed this paper. Coupling simulation are carri...