2010
2010
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Record 145 of
Title:Research on spatially modulated Fourier transform imaging spectrometer data processing method
Author(s):Huang, Min(1,2); Xiangli, Bin(1,3); Lü, Qun-Bo(1); Zhou, Jin-Song(1,2); Jing, Juan-Juan(1,2); Cui, Yan(1,2)Source: Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis Volume: 30 Issue: 3 DOI: 10.3964/j.issn.1000-0593(2010)03-0855-04 Published: March 2010Abstract:Fourier transform imaging spectrometer is a new technic, and has been developed very rapidly in nearly ten years. The data catched by Fourier transform imaging spectrometer is indirect data, can not be used by user, and need to be processed by various approaches, including data pretreatment, apodization, phase correction, FFT, and spectral radicalization calibration. No paper so far has been found roundly to introduce this method. In the present paper, the author will give an effective method to process the interfering data to spectral data, and with this method we can obtain good result.Accession Number: 20101412827149 -
Record 146 of
Title:Analysis of stray light caused by thermal radiation of infrared detection system
Author(s):Niu, Jinxing(1,2,3); Zhou, Renkui(1); Liu, Zhaohui(1); Yang, Jianguo(1,3); Cai, Zhan'en(1,3); Lin, Futiao(1,3)Source: Guangxue Xuebao/Acta Optica Sinica Volume: 30 Issue: 8 DOI: 10.3788/AOS20103008.2267 Published: August 2010Abstract:A typical infrared detection system [Ritchey-Chretien (R-C) system] and its baffles are designed. Its structure model is established with the TracePro software. Stray lights caused by thermal radiation of critical inner surface are analyzed by a ray tracing program. The relation of photons of stray lights and temperature which varies from 250 K to 320 K is given. The stray light caused by sky background is calculated. The curve of increasing rate of photon number of stray lights received by single pixel versus temperature is given. The results show that an open telescope without main tube cannot do well obviously in reducing stray lights. The temperature of the inner baffle of main mirror should be less than 230 K in order to detect the background-limited target.Accession Number: 20103613222085 -
Record 147 of
Title:Techniques for pixel response nonuniformity correction of CCD in interferential imaging spectrometer
Author(s):Yao, Tao(1,4); Yin, Shi-Min(2); Xiangli, Bin(3); Lü, Qun-Bo(4)Source: Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis Volume: 30 Issue: 6 DOI: 10.3964/j.issn.1000-0593(2010)06-1712-05 Published: June 2010Abstract:Based on in-depth analysis of the relative radiation scaling theorem and acquired scaling data of pixel response nonuniformity correction of CCD (charge-coupled device) in spaceborne visible interferential imaging spectrometer, a pixel response nonuniformity correction method of CCD adapted to visible and infrared interferential imaging spectrometer system was studied out, and it availably resolved the engineering technical problem of nonuniformity correction in detector arrays for interferential imaging spectrometer system. The quantitative impact of CCD nonuniformity on interferogram correction and recovery spectrum accuracy was given simultaneously. Furthermore, an improved method with calibration and nonuniformity correction done after the instrument is successfully assembled was proposed. The method can save time and manpower. It can correct nonuniformity caused by other reasons in spectrometer system besides CCD itself's nonuniformity, can acquire recalibration data when working environment is changed, and can also more effectively improve the nonuniformity calibration accuracy of interferential imaging spectrometer system.Accession Number: 20102513031005 -
Record 148 of
Title:Structural investigation of GeS2-Sb2S3-CdS chalcogenide glass by using Raman spectroscopy
Author(s):Guo, Haitao(1); Chen, Hongyan(2); Lu, Min(1); Peng, Bo(1); Lin, Aoxiang(1); Wang, Yongqian(1)Source: Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society Volume: 38 Issue: 11 DOI: Published: November 2010Abstract:The structure of GeS2-Sb2S3-CdS pseudo-ternary system glass was investigated by using Raman spectroscopy. The results show that the basic structure units forming the glass network are quasi-three-dimensional (3D) [GeS4] tetrahedra and quasi-two-dimensional (2D) [SbS3] pyramids. With the increase of Sb2S3 content, the structure of glass transfers from the 3D structure to the [GeS4]m, [SbS3]n formed layer or chain structure, which is interconnected by Ge-S-Sb bridging sulfurs and Sb-Sb, Ge-Sb, Ge-Ge metallic bonds. CdS can bring some non-bridge sulfurs and decrease the degree of polymerization. Because of the additions of Sb2S3 and CdS, large amount of metallic and dangling bonds are formed; therefore, the number of defects of glass is increased.Accession Number: 20105013489531 -
Record 149 of
Title:A novel image quality metric based on morphological component analysis
Author(s):Li, Xuelong(1); He, Lihuo(2); Lu, Wen(2); Gao, Xinbo(2); Tao, Dacheng(3)Source: Conference Proceedings - IEEE International Conference on Systems, Man and Cybernetics Volume: Issue: DOI: 10.1109/ICSMC.2010.5642482 Published: 2010Abstract:Due to that human eye has different perceptual characteristics for different morphological components, so a novel image quality metric is proposed by incorporating morphological component analysis (MCA) and human visual system (HVS), which is capable of assessing the image with different types of distortion. Firstly, reference and distorted images are decomposed into texture and cartoon components by MCA respectively. Then these components are changed into perceptual features by just noticeable difference (JND) which integrates masking features, luminance adaptation and contrast sensitive function (CSF). Finally, the difference between reference and distorted images' perceptual features is quantified using a pooling strategy, and then the final result of the image quality is obtained. Experimental results demonstrate that the performance of the metric prevail over some existing methods on LIVE database II. ?2010 IEEE.Accession Number: 20110413608725 -
Record 150 of
Title:An energy-efficient environment monitoring scheme for wireless sensor networks based on contour mapping
Author(s):An, Yuan(1,2,3); Sun, Limin(3); Ma, Caiwen(1); Zhu, Hongsong(3); Fang, Weiwei(4)Source: Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University Volume: 44 Issue: 2 DOI: Published: February 2010Abstract:A novel contour mapping scheme based on Bezier curves for wireless sensor networks, SENS-T, is presented to solve the problem of energy limits in using wireless sensor networks to monitor environments. The scheme uses contours to represent the distribution of environment attribute value, that is, the contour is divided into pieces of Bezier curves, the shape and the position information of each Bezier curve is collected to one deputy node and is reported to the sink; and the sink uses the nodes coordinates and the received curve information to rebuild the contour curve. The number of report nodes is determined by the number of Bezier curve segments so that the traditional method that reports the information of all nodes on the contour is reformed. Simulation results show that the energy and bandwidth of network are saved efficiently by SENS-T, and a comparison with the traditional method at the same accuracy of counter mapping shows that the SENS-T saves approximately 45% network energy.Accession Number: 20101312808471 -
Record 151 of
Title:Ultrahigh speed all-optical AND logic gate using integrated silicon-based MZI device
Author(s):Wu, Jian-Wei(1,2)Source: Journal of Modern Optics Volume: 57 Issue: 6 DOI: 10.1080/09500341003692971 Published: March 2010Abstract:In this paper, we present a device with a silicon-on-insulator (SOI) based symmetrical Mach-Zehnder interferometer (MZI) structure to perform the ultrahigh speed all-optical AND logic gate function. Simulation results show that, while the operation speed is at a bit rate of 200 Gbit -1, the output parameters including extinction ratio and eye-opening ratio for outcome AND logic gate signal can, respectively, reach as high as～12.8 dB, and ～0.94 in the case of a 5 mm long SOI waveguide by means of judiciously adjusting the initial conditions, such as incident signal and probe continuous-wave (CW) powers. ? 2010 Taylor & Francis.Accession Number: 20101912922257 -
Record 152 of
Title:Spectrum recovery methods for nonuniform sampling interferogram
Author(s):Yao, Tao(1,4); Lü, Qun-Bo(2); Xiangli, Bin(2); Yuan, Yan(3)Source: Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis Volume: 30 Issue: 5 DOI: 10.3964/j.issn.1000-0593(2010)05-1430-04 Published: May 2010Abstract:The interferogram acquired by imaging Fourier transform spectrometer (IFTS) can't be used directly and must be recovered. The spectrum recovery processes based on fast Fourier transform (FFT) is the traditional method which is used widely. For some IFTS, the nonuniform sampling of the interferogram is often occurrs. When the aliasing is neglected, the spectrum recovered by traditional method is often distorted. When the spectrum recovery processes based on Fourier transform are used, the precision of the recovered spectrum can be ensured, but the real-time processing requirement can't be satisfied. In order to acquire the precise recovered spectrum of the nonuniform sampled interferogram, the interpolation method and nonuniform fast Fourier transform (NUFFT) method were adopted. For the oversampled interferogram and partial undersampled interferogram, the spectrum recovery methods based on interpolation and NUFFT were presented respectively, and the applicability of these two methods is given. Finally, the computer simulation was performed, and the results indicate that NUFFT method is preferable to interpolation method not for undersampled interferogram but for oversampled interferogram.Accession Number: 20102212974716 -
Record 153 of
Title:Spatio-temporal salience based video quality assessment
Author(s):Gao, Xinbo(1); Liu, Ni(1); Lu, Wen(1); Tao, Dacheng(2); Li, Xuelong(3)Source: Conference Proceedings - IEEE International Conference on Systems, Man and Cybernetics Volume: Issue: DOI: 10.1109/ICSMC.2010.5642429 Published: 2010Abstract:It is important to design an effective and efficient objective metric of the video quality in video processing areas. The most reliable way is subjective evaluation, thus the most reasonable objective metric should adequately consider characteristics of the human visual system (HVS). Visual attention (VA) is one of the essential visual phenomena of HVS, the realization of which relies on the saliency of visual field. Moreover, the saliency of visual field has a great influence on recognition, memorization and subjective evaluation of the image. This paper explores the saliency of visual field for objective quality assessment of videos. The proposed method first uses the VA model to obtain visual saliency map of the distorted video, including color, intensity and motion. Then the salient map is used to weight a structural similarity map between the original and distorted videos to get the final value of the video quality. Experimental results prove that the proposed method achieves a good correlation with subjective valuation. ?2010 IEEE.Accession Number: 20110413608677 -
Record 154 of
Title:A Bezier curve based contour mapping algorithm for wireless sensor networks
Author(s):An, Yuan(1,2,3); Ma, Caiwen(1); Sun, Limin(3); Zhang, Chenwei(4); Fang, Weiwei(5)Source: Gaojishu Tongxin/Chinese High Technology Letters Volume: 20 Issue: 8 DOI: 10.3772/j.issn.1002-0470.2010.08.004 Published: August 2010Abstract:From the perspective of actual environmental monitoring demand in wireless sensor networks (WSNs), the paper puts forward an algorithm for contour mapping based on Bezier curves (CMBC) in these scenarios. The CMBC algorithm is based on the theory of Bezier curves and is widely used in computer graphics. It selects part of nodes to send contour mapping information to sink. In monitoring scenarios, the CMBC algorithm effectively solves the conflicts between demand of precision and transmission restraint, high energy consumption caused by nodes increasing. The comprehensive simulation results show that the CMBC algorithm achieves a high fidelity of contour mapping by using much fewer nodes as data sources than existing works, so the algorithm can save the limited energy of nodes and extend network life.Accession Number: 20103713225867 -
Record 155 of
Title:Developments and trends of the computed tomography imaging spectrometers
Author(s):Wei, Ru-Yi(1,2); Zhou, Jin-Song(3); Jing, Juan-Juan(1,2); Wang, Xin-Quan(1,2); Gao, Xiao-Hui(1,2); Wang, Le(1)Source: Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis Volume: 30 Issue: 10 DOI: 10.3964/j.issn.1000-0593(2010)10-2866-08 Published: October 2010Abstract:The present paper reviews the computed tomography imaging spectrometer (CTIS) measurement systems at home and abroad from the aspects of technological characterizations and research focuses. The developments of computed tomography imaging spectrometers are described, involving the adding new abilities by improving systematic structure and by incorporating other elements or systems, the study and applications of novel grating elements, detectors or apparatus, the optimizations and improvements of the system calibration methods and reconstruction algorithms. In addition, based on the classification of application scope, the extension status of probing spectral bands and application fields towards computed tomography imaging spectrometers and related systems are summarized. The principles of non-scanning computed tomography imaging spectrometer and high-throughput computed tomography imaging spectrometer are introduced. Moreover, the trends of computed tomography imaging spectrometers are discussed too.Accession Number: 20104313324462 -
Record 156 of
Title:Research on spectral classification algorithm based on spatial feature
Author(s):Gao, Xiao-Hui(1,3); Xiangli, Bin(2); Wei, Jun-Xia(1,3); Wei, Ru-Yi(1,3); Yu, Tao(1)Source: Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis Volume: 30 Issue: 10 DOI: 10.3964/j.issn.1000-0593(2010)10-2772-04 Published: October 2010Abstract:With the wide use of imaging spectroscopy, applying data cubes to classification and identification of materials has been developed to be an important research content. The classification algorithms play a vital role in accuracy and precision of object identification. The most common classification algorithms mainly make use of the information gained from spectral dimension and classify the materials based on spectral match. The material reflectance spectra collected by imaging spectroscopy is determined not only by the sorts, but also by the geometry structure and roughness of material surface, and so on. Then classification and identification algorithms only using the reflection spectra have errors to some extent. This paper puts forward an algorithm based on the common classification algorithms that controls the classification process by using the spatial feature of image to promote the correctness of classification. This algorithm was applied to identify the true leaves from the fake ones. The result shows preferable spatial continuity. To a great extent, the algorithm overcomes "ma pixel" domino effect, and is proved valid.Accession Number: 20104313323538