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To track the movement of wireless capsule endoscope in the human body, we design a magnetic localization and orientation system. In this system, capsule contains a permanent magnet as the movable object. A wearable magnetic sensor array is arranged out of the human body to capture the magnetic signal. This sensor array is composed of magnetic sensors, Honeywell product HMC1043. The variations of magnet...
The accuracy of corner detection is critical for many machine vision applications. A novel corner detector based on video is proposed in this paper. The corner detector can effectively constrain camera noise by using multiple frames from video. The kernel of this method is the similarity algorithm which including a special representation of binary image, a robust template, a simple similarity function...
In this paper, we discuss the influence of the antenna orientation radiation pattern in localization algorithm based on Received Signal Strength Indicator (RSSI). We also improve the empirical model of signal propagation by building the path loss function of the human gastro-intestine (GI) tract. The novel model includes information of both the distance and azimuth angle variables. The numerical electromagnetic...
In this paper, we present a mobile agent based software architecture for home telemonitoring network. The system mainly contain 4 components: end monitoring node, relay station, doctor workstation, and manufacturer server. The manufacturer created mobile code is transferred from the manufacturer server to the relay station or the doctor workstation for executing in an on-demand mode, such that a highly...
To track the movement of a wireless capsule and get the 6D localization and orientation information of the capsule, a magnetic localization and orientation system is designed. In this system, we propose to enclose two orthogonal permanent magnets in the capsule. With the magnetic sensor array arranged out of the human body, we can measure the magnets' magnetic signals, and compute the magnets' 3D...
A key component in automatic external defibrillator (AED) is to discriminate ventricular fibrillation (VF) from non VF by means of appropriate detection algorithms, which should have a high detection quality, be easily implementable, and work in real time. In this study, we presented a novel and computationally simple algorithm for VF detection using sample entropy (SampEn) method. To evaluate the...
Cognitive radio makes it possible for an unlicensed user to access a licensed spectrum opportunistically on the basis of non-interfering. This paper addresses the problem of joint route selection and resource allocation in OFDMA-based multihop cognitive radio networks, in the objective of optimizing different types of end-to-end performance. Aiming to solve it optimally, we first show that this problem...
Identification of various P2P flows accurately is fundamental for network management. To obtain P2P flow information in real-time and low price, a distributed extensible architecture for P2P flows identification called DEAPFI is proposed. DEAPFI decentralizes functions of flow identification and statistic on different PC, which is composed of identification system (IS) and statistic system (SS) respectively...
In the RoboCup competition, vision system is regarded as of great importance with its high information contents, convenient implementation, and suitability for human sights of common and inexpensive hardware. In this paper, we discuss the vision system of ROBOCUP Small Size League, and introduce a digital way for segmentation of this color based robotic motion, camera calibration is also included...
To build a new type of wireless capsule endoscope with interactive gastrointestinal tract examination, a localization and orientation system is needed for tracking 3D location and 3D orientation of the capsule movement. The magnetic localization and orientation method produces only 5 DOF, but misses the information of rotation angle along capsule's main axis. In this paper, we presented a complementary...
A hybrid system of cellular mode and the peer-to-peer (P2P) mode is considered in this paper, where the cellular uplink resource is reused by the P2P transmission. In the objective of overall system throughput maximization, we addresses the problem of distributed power control of P2P transmission in the hybrid system model. Some preliminary results of the problem are presented first to investigate...
This paper proposes a new localization algorithm, which can get the position and orientation of an object in the limited area, like indoor and in-vivo scenarios. The prototype of our localization model is based on the RF Signal Strength. Different from other indoor localization methods, our method can realize the 5-Dimensional (5D) localization and tracking for the target. To apply our method in real...
To track the movement of a wireless capsule, a magnetic localization and orientation system is designed. In this system, a permanent magnet is enclosed in the capsule, which generates a magnetic field around. With the magnetic sensor array arranged out of the human body, we can measure the magnet's magnetic signals, and compute the capsule's 3D localization and 2D orientation parameters by applying...
This paper presents a FPGA-based auto focusing system for object ranging. It overcomes the disadvantage of manual focusing wise in traditional method of objects ranging. In our system, the distance of objects can be measured automatically by the auto focusing algorithm. We have experimentally demonstrated the effectiveness of this method. The best performance of our system is about 3% relative errors...
Recent advances in wireless communication, semiconductor, embedded system and sensor technology have made it possible to build low cost, low power consumption, reconfigurable wireless vision sensor nodes. Wireless vision sensor networks, which consist of wirelessly connected embedded systems with vision capabilities, provide wide a variety of applications that are impossible to be realized with the...
A permanent magnet is embedded in the capsule endoscope to perform as an excitation source for tracking capsule's position and orientation, and a magnetic sensor array is built around the capsule to capture the signals from magnet. However, the magnet-field signal is weak and attenuates dramatically when the spatial distance between the magnet and the sensor increases. How to detect this weak magnetic...
By using high-performance graphics rendering engine, virtual reality (VR) technology is introduced for the complexity of dynamic simulation to develop the dam construction process visualization system. In this paper, the cofferdam demolition model and the integration model of visualization system and computer simulation are set up, and then an interactive mechanism is built with Crazy Eddie's graphical...
Object localization defines an important application for wireless sensor networks. In this paper, we present a hybrid of dual-modal mobile localization system to support the object tracking in indoor environment. In order to decrease the system cost and simplify the sensor deployment, we implement the localization by the received radio signal strength approach and the unscented Kalman filter (SPKF)...
A capsule endoscope robot is a miniature medical instrument for inspecting human gastrointestinal tract. One of the objectives of the capsule endoscope robot is to wirelessly transmit as many captured images as possible, so an efficient representation and compression technique is required. In this paper, we present image representation and compression techniques for the capsule endoscope. First, the...
To resolve the topology mismatch problem when applying peer-to-peer (P2P) file sharing over mobile ad hoc networks (MANETs), a cross-layer protocol is proposed by combining P2P file discovery with the route discovery process at the network layer. In this protocol, the functionality of conventional routing protocols is extended to identify the file discovery request, and P2P connections are established...
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