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Localization is the core part of robot technique, and the robot localization based on the vision information attracts an unceasing attention of the robot control system. Taking effective image processing is the key to realize localization correctly, and only in this way can the precise location information be obtained. This paper is designed in the context of robot competition, and its filed has regular sharp and obvious characteristics. So it is crucial to get the straight line information. In this paper, the system of image processing based on PC-104plus bus is described firstly. Then some effective processing is taken to extract the straight line information, with which the intersection points can be found. And then the robot localization can be realized. The whole system is robust, accurate and fast, which is qualified for most robot competitions.

Network intrusion detection systems (NIDS) require multi-match packet classification, where all matching results need to be reported. Ternary Content Addressable Memory (TCAM) is well suited for high-speed packet classification problem by fast parallel matching. However, TCAM can only report first result due to the priority encoder structure. An efficient multi-match scheme is introduced in this paper. Novel sequence encoding we proposed keeps all matching results output one by one in exactly one conventional lookup period. And the design is prototyped in an Altera FPGA and proved fast enough to sustain OC48 traffic throughput.

JPEG2000, the state-of-the-art image compression standard, has many advantages, such as high compression efficiency and high image fidelity. However, because of its high computational complexity, real-time hardware implementation of JPEG2000 becomes a big problem when using it in deadline constrained applications. EBC algorithm is the main part of JPEG2000 which comprises more than 50% of the computational complexity. Aiming at the shortcut of the EBC framework which is not suitable for the establishment of DSP software pipeline, a parallel framework for real-time DSP implementation of EBC algorithm is proposed in this paper. The original bit-plane coding module is firstly partitioned into bit-plane scanning module and arithmetic coding module. Then the sign coding is separated from the bit-plane scanning module and implemented ahead. And the multiple loops of the bit-plane scanning module are unrolled with context combining. By these optimizations, the software pipeline of the EBC algorithm can be established which leads to an eight-time faster implementation speed.

The interaction between fluoroquinolones (FQs), ofloxacin and enrofloxacin, and bovine serum albumin (BSA) was investigated by fluorescence and UV–vis spectroscopy. It was demonstrated that the fluorescence quenching of BSA by FQ is a result of the formation of the FQ–BSA complex stabilized, in the main, by hydrogen bonds and van der Waals forces. The Stern–Volmer quenching constant, K SV , and the corresponding thermodynamic parameters, Δ H , Δ S and Δ G , were estimated. The distance, r , between the donor, BSA, and the acceptor, FQ, was estimated from fluorescence resonance energy transfer (FRET). The effect of FQ on the conformation of BSA was analyzed with the aid of UV–vis absorbance spectra and synchronous fluorescence spectroscopy. Spectral analysis showed that the two FQs affected the conformation of the BSA but in a different manner. Thus, with ofloxacin, the polarity around the tryptophan residues decreased and the hydrophobicity increased, while for enrofloxacin, the opposite effect was observed.

Packet classification has been critical data path function for supporting quality of service (QoS), resource reservation protocol (RSVP) and broad range of multimedia services. Hardware based solution is necessary to keep up with high-speed rate up to OC192 processing. However, the range match in multi-fields classification is still one of the bottleneck problems. In this paper, a novel structure called range match block is designed. The range match block stores range rules directly and performs range match parallel in each entry at high-speed. Experimental results show the range match block can process about 66.7 million packets per second (Mpps). Furthermore, we propose a multi-field packet classification architecture based on range match block and ternary CAM. The architecture is well-suited for all kinds of network applications.

With sharp development of new application on network, bandwidth has increased up to 10~40 Gbps. It?s very important to take more efficient information processing to fulfill requirements of better services quality. This article focuses on the construction of backbone network based on IP over SDH. By analysis of transmit structure and protocol stack, several key techniques of information processing are pointed. Furthermore a system module designed with FPGA is proposed. The results show that information of different services can be classified in line speed.

A novel blind recognition algorithm of frame synchronization words is proposed to recognize the frame synchronization words parameters in digital communication systems. In this paper, a blind recognition method of frame synchronization words based on the hard-decision is deduced in detail. And the standards of parameter recognition are given. Comparing with the blind recognition based on the hard-decision, utilizing the soft-decision can improve the accuracy of blind recognition. Therefore, combining with the characteristics of Quadrature Phase Shift Keying (QPSK) signal, an improved blind recognition algorithm based on the soft-decision is proposed. Meanwhile, the improved algorithm can be extended to other signal modulation forms. Then, the complete blind recognition steps of the hard-decision algorithm and the soft-decision algorithm are given in detail. Finally, the simulation results show that both the hard-decision algorithm and the soft-decision algorithm can recognize the parameters of frame synchronization words blindly. What's more, the improved algorithm can enhance the accuracy of blind recognition obviously.

A kind of software solution is provided to implement counting and division of moire fringes in this paper. No complex electronic circuit of digital counter exists in the digital reader that adopts this software solution. The counting and division of the fringes are completed in DSP (digital signal processor), so it can solve the problems that counting circuit can't match the subdivision system properly by logical judgement. Because of utilizing high-speed optoelectronic convertor and flash sample technique, the system can process moire signal with wide frequency range. The example demonstrated in the paper can count and divide signals from DC to 1MHz, i.e., if the optical sensitivity of the signal is 1 fringe per micrometers , the fastest measure speed can reach 1000mm/s. The experimental result shows that the software solution has high accuracy and sound reliability.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

To acquire high precision of subdivision in optical displacement measuring, the signal quality of moire fringes must be kept reliable and constant. Several software solutions to enhance the signal quality of moire fringes are provided in this paper. The process platform is based on SHARC DSP and flash sample technique. Three methods of adaptive digital filter are used respectively to eliminate the unwanted drift of signal, improve the orthogonality of two channels of sine and cosine intensity signals of moire fringe, and keep the amplitude of the signal constant. Firstly, the operation procedure of the acquisition and process system is described, then the principle of the adaptive signal process is explained. And at the same time, the result of the experiment is also listed to show the effects of the process software in digital signal processor.

This paper introduces the master-slave DRCP (Distributed Control Protocol), a new protocol for field bus. In this protocol, the master controller uses differential signals to transmit control command and to communicate with the executive units. It can control several executive units at the same time, and can also command each unit respectively. Because the protocol adopts bi-directional communication mode, the controller can obtain the feedback information and measure data from the executive units while it is sending commands. So the protocol has data acquisition ability. First, the reason and significance to bring forward this protocol is presented, then the physical link and the signals transmitted on data line is introduced, which is followed with an example based on RS485 standard. Secondly, the application situation and system configuration to utilize this protocol is described. In this part, the standard to select the operation speed of processor is given. Thirdly, the paper emphasizes on communication regulation. In the end, an applied example is given.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

According to the characteristics of video sensor output, a method based on DSP (Digital Signal Processor) and VLSI (Very-Large Scale Integrated Circuit) memory is provided. Firstly, this paper introduces the signal characteristics of the video sensors, e.g. high-speed 2-D array charge coupled device and infrared image devices. Then the special requests are got to process and store video signals from the point of view of output speed and data capacity. In the sequence of the function modules of normal signal processing system, the pipeline cache, pre-process, smart trigger, dynamic storage, and permanence storage of signals or data are systematically explained. And to satisfy the need of video frequency process system, different devices and operation modes are determined for every module. Among these, the selection and performance request of DSP applied in video system, the characters of all kinds of memory, and the begotten problems when they are applied in the system are described in detail. Secondly, the interfaces that utilize video FIFO, great- capacity DRAM, and flash memory for permanence storage are emphasized. In the last design, the DMA (Direct Memory Access) page operation mode is presented in detail when DSP and flash memory are used. At the end of this paper, the methods by which the video signal process system communicates with computer are introduced.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

The basic principle and characteristics of displacement sensor with nonsymmetrical double gratings (DSNDG) are brieflydescribed in the paper firstly. Besides the wide range and high resolution, very fine optical subdivision can be attained withthe technique of DSNDG, which can largely expand the measurement range without decreasing the resolution. ThenDSNDG is proved with the theories of Doppler effect. And the experimental research is done in the end.In the experimental research, some experimental phenomena are analyzed. The reasons and conditions for the formation ofmoire fringe are introduced. The effect of optical configuration, such as the angle of incidence and position of the twogratings, on the moire fringe is discussed. Then the factors affecting the moire fringe contrast and the methods to improvethe fringe contrast are analyzed.Keywords: Moire fringe, Doppler effect, Blazed grating, Fringe contrast, Displacement Sensor 1. INTRODUCTION As a way to transform displacement signal to photoelectric one, technology of moire fringe has been widely used in digitaldisplacement measurement, dynamic comparison measurement, strains analysis, and so on. For wide measuring range, inorder to improve measuring sensitivity, D.post put forward the idea of moire fringe multiplication with a nonsymmetrical