2012
2012
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Record 73 of
Title:The redevelopment of matrox meteor-II /digital image grabbing board with VC++
Author(s):Liu, Caifang(1,2); Hu, Bingliang(1); Wang, Cailing(1,2); Liu, Lei(1,2)Source: Advanced Materials Research Volume: 532-533 Issue: DOI: 10.4028/www.scientific.net/AMR.532-533.1152 Published: 2012Abstract:In order to store real-time images, a digital image grabbing system is proposed in this paper. The principles and design of real-time image continuous grabbing, displaying and storing system are presented. It has been redeveloped based on Matrox Meteor-II /Digital Image Grabbing Board by the use of VC++, and the whole implementation was introduced by an example. The developed image capture software is given at the end of this paper. And this gives a new thought and platform for real-time image processing. ? (2012) Trans Tech Publications, Switzerland.Accession Number: 20124615672220 -
Record 74 of
Title:Research and design of color restoration algorithm for demosaicing bayer pattern images
Author(s):Zhu, Bo(1,2); Wen, Desheng(1); Gao, Wei(1); Song, Zongxi(1); Li, Hua(3)Source: Applied Mechanics and Materials Volume: 130-134 Issue: DOI: 10.4028/www.scientific.net/AMM.130-134.745 Published: 2012Abstract:This paper analyses the process of obtaining real color image based on a single CCD/CMOS sensor. Bayer CFA Interpolation algorithm and White Balance algorithm are presented. The proposed interpolation algorithm which can obtain better color image and is easier to implement by hardware is provided. In order to cancel chromatic aberration, one White Balance algorithm which aims at sequential image is presented and process of FPGA design is given. Experimental results show that the design works normally. The color of corrected picture is vivid compared to the real world. ? (2012) Trans Tech Publications, Switzerland.Accession Number: 20114714534401 -
Record 75 of
Title:Influence of optical system distortion on LASIS data
Author(s):Jing, Juanjuan(1,2); Wei, Ruyi(1,2); Yu, Tao(1,2); Lv, Qunbo(3); Zhou, Jinsong(3); Wang, Le(4)Source: IST 2012 - 2012 IEEE International Conference on Imaging Systems and Techniques, Proceedings Volume: Issue: DOI: 10.1109/IST.2012.6295513 Published: 2012Abstract:Optical distortion is a kind of ubiquitous problem in optical system, although it has little effect on the clarity of the image, it has a bad effect on the precision of the imaging geometrical position, especially in the optical system with large field of view, and it will be increased largely with increasing the view field. In the LASIS(Large Aperture Static Imaging Spectrometer) system, if the optical system has distortion, it may lead to inadequate sampling, which means that it couldn't satisfy the Nyquist sampling theorem, causing the recovery spectrum distortion. Because the larger the distortion, the lower the registration precision, it's very hard to correct the distortion effect, thus, it is useful to analyze the influence of optical system distortion on the image quality. An optical distortion model is developed in the paper to evaluate the optical design, the distortion data is calculated from the optical design software and the influence of optical system distortion on the data acquired by LASIS is analyzed. ? 2012 IEEE.Accession Number: 20125015788768 -
Record 76 of
Title:High-precision stable tracking technique of electro-optical countermeasures platform
Author(s):Peng, Wei(1); Cao, Jianzhong(1); Yang, Xiaojun(1); Luo, Junping(2); Guo, Min(1); Liu, Feng(1)Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering Volume: 41 Issue: 11 DOI: Published: November 2012Abstract:In order to meet the requirements of an electro-optical countermeasures platform for high precision and smooth continuous tracking, a controller based on PI-P composite control technique was proposed. It had the advantage of simple structure and high resistance to load disturbances as well as smooth control and ensured tracking precision. On the other hand, by the method of checking the rationality of the miss distance signals of the video tracking processor firstly, then fuse the video tracking data with the external guiding data, it was able to remove interference and improve the reliability and prediction accuracy of the future position of the mobile target so as to ensure the continuity and the tracking stability. Experimental results show that the system can meet the demand of smooth and continuous tracking, at the accuracy-guaranteed angular velocity of 20 (°)/s and the accuracy-guaranteed angular acceleration of 25 (°)/s2. The tracking precision is less than 2', and the system has wide adaptability.Accession Number: 20130415940890 -
Record 77 of
Title:Study on the precision measurement of high-flux large aperture sampling grating
Author(s):Yuan, Hao-Yu(1); Chen, Yong-Quan(2); Peng, Zhi-Tao(1); Duan, Ya-Xuan(2); Wu, Jian-Hong(3); Fu, Shao-Jun(4)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 8417 Issue: DOI: 10.1117/12.2002127 Published: 2012Abstract:This paper describes an effective method for the measurements of large aperture sampling grating, the sampling efficiency the sampling focal length and the sampling angle. By using a 351nm collimation laser source to scan the full aperture of the sampling grating in every subregion, the diffraction power of "0" order and "+1" order can be obtained synchronously by two standard integrating balls, And then by calculating the sampling efficiency of this subregion and splicing the acquisition data, we can get the averaged grating sampling efficiency in the full aperture.Based on this method, we can effectively eliminate the effect of the output instability of laser source, decrease the uncertainty of test results. According to the fabrication principle of the sampling grating, measurements for the sampling focal length and the sampling angle can be performed. Test rersults indicate that this method can be used to measure large aperture sampling gratings. ? 2012 SPIE.Accession Number: 20131416173323 -
Record 78 of
Title:NiosII custom instruction on FIR filter arithmetic
Author(s):Tian, Ye(1); Li, Yan(1); Dong, Qiang(1)Source: Proceedings of 2012 International Conference on Modelling, Identification and Control, ICMIC 2012 Volume: Issue: DOI: Published: 2012Abstract:According to the principle of FIR filter, we firstly design and simulate the model file with DSP Builder in the environment of Matlab/Simulink. Secondly, we transform this model file to VHDL source codes with Signal-Compiler and implement processes of analysis, synthesis and adaptation in Quartus II. At last, we create a SOPC system-NiosII, where FIR filter arithmetic can be generated to a custom instruction. Till now, the hardware-software co-design of FIR filter arithmetic has been completed. ? 2012 Huazhong Univ of Sci & Tec.Accession Number: 20124015531483 -
Record 79 of
Title:A Novel Adaptive Fast Motion Estimation Algorithm for Video Compression
Author(s):Xie, Li-Yin(1); Su, Xiu-Qin(1); Zhang, Shun(1); Xu, Zhi-Gang(1)Source: Lecture Notes in Electrical Engineering Volume: 165 LNEE Issue: DOI: 10.1007/978-1-4419-8849-2_31 Published: 2012Abstract:In this chapter, a novel adaptive fast algorithm is proposed by composing three techniques together, namely, (1) sorted predictive motion vectors (MV), (2) dynamic search range, and (3) adaptively changed search patterns. The proposed algorithm is implemented in JM 11.0 and evaluated by comparing it with some fast ME algorithms adopted in JM using different test sequences. The algorithm is assessed by three measures: ME time, PSNR of the luma component, and the variation of bitrates. The experimental results show that the proposed algorithm achieves excellent compression efficiency for different test sequences. Comparing with the full search (FS), the proposed algorithm can save as much as 95% ME time with less than 0.6% increment of bitrates and 0.15 dB decrease of PSNR on average. ? Springer Science+Business Media, LLC 2012.Accession Number: 20224012829187 -
Record 80 of
Title:A new identification method of linear system based on the feature of step response curve
Author(s):Wu, Xiangfu(1); Qiao, Yongming(1)Source: Proceedings of 2012 International Conference on Modelling, Identification and Control, ICMIC 2012 Volume: Issue: DOI: Published: 2012Abstract:The purpose of this paper is to obtain the transfer function of the linear time-invariant system from the feature of step response curve. According to the theory that the typical first-order and second-order component can comprise high order linear system in parallel form, we should firstly sum up laws of various parameters' aspect on the shape of the curve; Secondly, we can use these laws to adjust the value of various parameters in typical component, so as to make the parallel estimation model's step response curve get close to the actual system's step response curve, and we will obtain the mathematical model if the two curves are closed enough. In order to validate the feasibility and correctness of the algorithm, we develop an identification software with the help of MATLAB Graphical User Interface (GUI). The simulation results show that this method is reliable with high accuracy. ? 2012 Huazhong Univ of Sci & Tec.Accession Number: 20124015531489 -
Record 81 of
Title:ADXRS401 angular velocity measurement system based on TMS320F2812 and AD7898
Author(s):Guo, Zhihao(1); Liang, Yanbing(1)Source: Proceedings of 2012 International Conference on Modelling, Identification and Control, ICMIC 2012 Volume: Issue: DOI: Published: 2012Abstract:In order to measure the high precision simultaneous angular velocity of MEMS gyroscope, ADXRS401, we designed a stable and available simultaneous serial data acquisition system, which is mainly built based on TMS320F2812, DSP chip of TI, and AD7898, AD converter of ADI. AD7898 could convert analog signal to digital signal and transfer the collected data to TMS320F2812 by the serial port-Multichannel Buffered Serial PORT (McBSP). After the pretreatment of TMS320F2812, the collected data would be transferred to the PC by the module of wireless transmission. At last, the PC could draw the waveform graph of the collected data and calculate the minimum and maximum value. We could easily estimate the designed system good or not. After the joint debug of software and hardware, we could make it better meet the design requirements. The design of hardware interface circuits, design of software procedures, and debug of hardware and software etc. are described in this paper. ? 2012 Huazhong Univ of Sci & Tec.Accession Number: 20124015531515 -
Record 82 of
Title:Snapshot imaging polarimeter using modified Savart polariscopes
Author(s):Cao, Qizhi(1,2,3); Zhang, Chunmin(1); De Hoog, Edward(4)Source: Applied Optics Volume: 51 Issue: 24 DOI: 10.1364/AO.51.005791 Published: August 20, 2012Abstract:In this paper, based on the combination of two modified Savart polariscopes, we present a snapshot imaging polarimeter and show that the carrier frequency is two times higher than that of the snapshot imaging polarimeter using two conventional Savart polariscopes. The signal-to-noise ratio and the spatial resolution of imagery in each channel are improved due to the increase of the carrier frequency when we filter the channels to recover the Stokes vector images. Moreover, compared with conventional imaging polarimetry, the remarkable advantage of the proposed instrument is that it is also simple, compact, miniature, snapshotted, and static (no moving parts). To demonstrate the feasibility of the proposed snapshot imaging polarimeter, the numerical simulation of a design example is presented in detail. ? 2012 Optical Society of America.Accession Number: 20123615400276 -
Record 83 of
Title:A review of 3D aircraft image recognition methods
Author(s):Zhu, Xufeng(1,2); Ma, Caiwen(1)Source: Advanced Materials Research Volume: 433-440 Issue: DOI: 10.4028/www.scientific.net/AMR.433-440.2794 Published: 2012Abstract:this paper provides a review of 3D aircraft object recognition methods based on 2D images. First, essentialities and advantages on 3D aircraft image recognition are analyzed. Second, in view of the aircraft image recognition system model, the traits of aircraft images are elaborated, then the methods of aircraft image recognition at every stage are discussed, especial the methods of feature extraction about aircraft image and the feasibilities, which some new methods about 3D object recognition are used to aircraft image recognition, are focused. At last, some issues about aircraft image recognition which should be further studied in the future are proposed. ? (2012) Trans Tech Publications, Switzerland.Accession Number: 20120414712580 -
Record 84 of
Title:Position and orientation control of an omni-directional mobile rehabilitation robot
Author(s):Luo, Dongfeng(1,3); Schauer, Thomas(2); Roth, Michael(2); Raisch, Jorg(1,2)Source: Proceedings of the IEEE International Conference on Control Applications Volume: Issue: DOI: 10.1109/CCA.2012.6402680 Published: 2012Abstract:Position and orientation control for an omni-directional mobile robot are investigated. The table-placed robot shall be used for arm and shoulder rehabilitation of stroke patients. The position and orientation of the device are determined by means of a modified Kalman filter which encompasses a kinematic model of the robot. By fusing information from incremental encoders at the robot and from an infrared camera at the ceiling, accurate and reliable estimates of robot position and orientation can be obtained. A cascaded position controller is designed for the mobile robot to allow the tracking of arbitrary translational reference movements and the stabilisation of the robot orientation. On the inner control loop, individual angular velocity controllers have been implemented for the three wheels to achieve maximum actuator performance and to facilitate a simplified state-space description of the robot dynamics. For the outer loop, a multi-variable state-space controller is utilised in form of a discrete-time linear quadratic regulator. The sensor fusion scheme and control system are validated in experiments and the obtained results are discussed. ? 2012 IEEE.Accession Number: 20130615994204