With the rapid growth of images database and computer networks broadcasting, the legal issues of multimedia copyright protection have become very important. In this paper, a method for video object watermarking using GVF snake and HU moments is proposed, providing copyright protection of the semantic content. To achieve this goal, the contour of the objects of an image is initialised by the use...

This paper proposes a new solution method for the leakage and static characteristics of smooth annular seal under homogeneous gas-liquid two-phase flow based on bulk-flow model. In this method, Rayleigh–Plesset equation is introduced into governing equations to describe behavior bubbles considering mixture compressibility. Detailed comparisons between Childs’ experimental rates predicted ones p...

The axial flow screw-type oil-gas multiphase pump is mainly applied to oil and gas transport in the deep sea. In process of transporting medium, volume fraction (GVF) on phase changes from time-to-time, resulting performance being greatly influenced by phase. This paper presents a detailed analysis gas-phase distribution law vortex passages within means numerical calculations, supplemented expe...

This paper is concerned with the introduction of a new gradient vector flow (GVF) field formulation that shows increased robustness in the presence of mixed noise and with its evaluation when included in the development of image enhancement algorithms. In this regard, the main contribution associated with this work resides in the development of an adaptive image enhancement framework that coupl...

Currently, there is a great interest in the development of computer-aided diagnosis (CAD) systems for dermoscopic images. The segmentation step is one of the most important ones, since its accuracy determines the eventual success or failure of a CAD system. In this paper, different kinds of algorithms for the automatic segmentation of skin lesions in dermoscopic images were implemented and eval...

Brain tumor scans are one of the complex segmentation problems. It is not at all easy to extract the tumor affected regions from the surrounding pixels which makes it a really diffi cult aspect for computer aided diagnosis systems. A new vector fi eld analysis of the GVF images for the detection of tumor boundaries has been proposed by the author. The boundary and non-boundary points has been i...

In the process of conveying a medium, when inlet pressure is low, cavitation phenomenon easily occurs in pump, especially gas–liquid two-phase working condition. The occurrence has great impact on performance multiphase pump. this paper, SST (sheard stress transport) k-? turbulence model and ZGB (Zwart–Gerber–Belamri) were used to simulate helical axial flow pump (hereinafter referred as pump),...

This paper introduces curvelet transform and gradient vector flow (GVF) snake to improvement accuracy in edge detection of waterway from remote sensing images. Multi-scale geometric analysis (MGA) is booming hot research topic in recent years, which aims to obtain flexible, fast and effective signal processing algorithms through efficient approximation and characterization for the inherent geom...