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Contraposing to the problem of manual selection of seeds and inaccurate object contour detection for the traditional region growing algorithm, in this work, a novel object contour extraction method is proposed based on salient region detection and automatic region growing, which consists of four crucial steps. Firstly we partition off an original image to be super-pixels by hexagonally arranged iterative...
Since the adverse effects may occur when the atmosphere value under un-uniform illumination is estimated, this paper proposed a dehazing method by using the homomorphic filtering technology. The innovation of this approach is that we use homomorphic filtering technology to remove un-uniform illumination firstly before obtaining its dark channel, then dehaze the pretreated image. During the process...
The design of Content Centric Network is one of the significant directions of Future Internet research. A wide range of issues have to be addressed including the Naming and Routing scheme. The naming and routing scheme builds the foundation for a scalable content-centric network infrastructure. In this paper, we first analyzed the evaluation criteria of naming in a Content Centric Network. Then we...
In order to solve the existing deficiencies of measuring the vacuum circuit-breakerpsilas stroke parameter, this paper proposes a new non-contact measurement method based on modern computer vision technology. Firstly, during the movement of switching operation of the vacuum circuit-breaker, CCD camera is utilized as the detect sensor to capture special images with specific screw fixed in the moving...
In this paper, a contention model for the IEEE 802.16e is first proposed to analyze the frame-based behavior of contention resolution in 802.16e network. Then a waiting-time dependent increasing rate adapted backoff (WDIA) algorithm is proposed to improve the contention efficiency. We introduce the concept of reduced overlapping between back-off windows of contending stations and we adopt an adapted...
We present a novel technique for pre-processing medical images based on the feature that medical image data obtained from CT scanner are regional sampled values. The new technique first establishes mapping relation between regional sampled values and point sampled values, then adopts cubic spline curve fitting to convert the regional sampled values to more precise approximations of point sampled values...
According to the characteristic that the medical CT image data are area samplings, a new preprocessing approach for CT image is presented in this paper. It firstly constructs mapping relationship between area sampling and point sampling, then detect the image edge with Sobel operator, and divide the CT image into different regions based on human tissue feature, and finally, in each divided region,...
Collaboration is becoming more and more important than before. Many fields including education and business can benefit from the visual collaboration. We already have many picture media sharing applications on the web, but the most natural media format organizing the information is the web page, but till now, there is no a very well-known application offering pure web page sharing without installing...
As the integration of prevailing voice over Internet protocol (VoIP) technology and wireless local area network (WLAN), voice over WLAN (VoWLAN) is expected to experience a dramatic growth in the near future. However, increasing voice capacity of the system still remains a problem. In this paper, the voice capacity of "waiting-time dependent backoff (WDB)" algorithm proposed in our previous...
The paper proposes an extended waiting-time dependent backoff (EWDB) algorithm for IEEE 802.11e WLAN as an extension of our previous WDB method. Concerning the QoS limitations of EDCA, EWDB controls backoff window (BW) according to waiting-time (WT), and staggers BW ranges among prioritized services. The algorithm is based on a flexible mathematic model consisting of deterministic function and random...
This paper presents a method to construct C1 polynomial surface with scattered data points. At first the given data points are divided into triangular networks, and then at the adjacent region of each point a C1 piecewise quadric interpolation patch is constructed. Objective function according to the stretching strain energy is constructed. Minimizing the objective function to determine the unknown...
The magnitudes of the endpoint tangent vectors are optimized in the Hermite interpolation process so that the curve length of the optimized geometric Hermite curve is a minimum. The tangent angle constraints ensuring an optimized geometric Hermite curve geometrically smooth are discussed. For the cases in which the given tangent vectors do not satisfy the constraints, new methods for constructing...
As the integration of prevailing Wireless Local Area Network (WLAN) and Voice over Internet Protocol (VoIP) technology, Voice over WLAN (VoWLAN) is expected to experience a dramatic growth in the near future. However, the widely deployed IEEE 802.11 contention-based Media Access Control (MAC) mechanism is unsuitable for voice transmission with strict Quality of Service (QoS) requirements. In this...
An express SIP NAT traversal server based on our transparent media switch used in SIP VoIP deployment is implemented, which can support media stream traverse symmetric NAT. The media switch proposed in this paper can make endpoints and SIP proxy both be unware of itself so the device can be deployed with the legacy equipments which can't support NAT traverse. With port index technique, our prototype...
This paper proposes an ebXML-based Service Composition Platform (SCP) for pervasive E-Commerce. SCP integrates six standardized components, which implement fundamental and generic services abstracted from E-Commerce process in real life. The design aims at reducing the repetition of development and investment, accelerating service creation, enhancing value-added capabilities. This paper describes...
This paper proposes a customer-centric, Intelligent-Agent and Web-Service based system to integrate the flexibility, adaptability and autonomy of agents, as well as the interoperability, decentralization and extensibility of Web Services. We apply the service composition concept for e-business to the horizontal service decomposition and business role differentiation. In advance we defined two types...
Power gating using sleep transistors is a trend for power management and test scheduling in the deep-submicron and even nanometer resolutions. This paper develops a sleep transistor allocation structure that can not only reduce the spike-time product with data retention but also balance the noise margins and timing in active mode. A switching activity based model is developed as a heuristics for sleep...
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