2011
2011
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Record 25 of
Title:The study of combined invariants optimization method on aircraft recognition
Author(s):Zhu, Xufeng(1,2); Ma, Caiwen(1)Source: 2011 Symposium on Photonics and Optoelectronics, SOPO 2011 Volume: Issue: DOI: 10.1109/SOPO.2011.5780562 Published: 2011Abstract:The method, which is interested in controlling the stability of image invariant features at every stage, is proposed to extract and select new combined invariants for training classifier when aircraft types are recognized. First, a typical aircraft automatic recognition system based on images is analyzed. Second, Hu's moments, Affine moments, Normalized Moment of Inertia and Normalized Fourier Descriptors are introduced. Third, multiple images with different kinds of 3D aircrafts under various small space angles are collected and the above four invariants from these images are extracted. Fourth, the new combined invariants are constructed based on these four kinds of invariants and are sent to support vector machine classifier for recognizing aircraft types. At last, the simulation results are shown that the recognition rate will be improved apparently if the new optimized combined invariants are used to training the support vector machine classifier. © 2011 IEEE.Accession Number: 20112514083055 -
Record 26 of
Title:Digital implementation of a galvanometric optical scanner based on DSP and FPGA
Author(s):Feng, Jing(1); Zhi, Jiang(2)Source: Proceedings 2011 International Conference on Mechatronic Science, Electric Engineering and Computer, MEC 2011 Volume: Issue: DOI: 10.1109/MEC.2011.6025857 Published: 2011Abstract:A galvanometric optical scanner in a laser marking system is controlled to achieve the demand of high speed and high accuracy. This paper presents a design of digital galvanometric optical scanner adopting a high-precision PID control algorithm with compensation based on repetitive control which is DSPFPGA-based architecture. This thesis consists of three parts including theory of laser marking system and galvanometer scanner construction, hardware design of DSPFPGA-based architecture, design and Simulation of scanning controller. © 2011 IEEE.Accession Number: 20114114423436 -
Record 27 of
Title:Autonomous star identification for GEO objects orientation based on delaunay triangulation
Author(s):Sun, Jing(1,2); L, Guangrui(1,2,3); Wen, Desheng(1); Xue, Bin(1); Yang, Shaodong(1,2)Source: Transactions of the Japan Society for Aeronautical and Space Sciences Volume: 54 Issue: 183 DOI: 10.2322/tjsass.54.62 Published: 2011Abstract:A novel star identification algorithm for GEO objects orientation is presented greatly. The quadrangle patterns are successfully generated by Delaunay triangulation applied to the sphere point set, which reduces the memory and identification time cost compared to the conventional triangle match algorithm. The guide database consisting of three correlative data tables is constructed to arrange the data efficiently. Furthermore, an index array is introduced to search the database rapidly. At validation, 60 images recorded by the GEO surveillance camera are used to implement the algorithm, which gives an identification rate ranging from 99.38% to 95.52% at various positional noise amplitudes. The achievable performance is demonstrated by comparison with two published algorithms. © 2011 The Japan Society for Aeronautical and Space Sciences.Accession Number: 20113714314994 -
Record 28 of
Title:InAs/GaSb superlattices grown by LP-MOCVD for ∼10 μm wavelength infrared range
Author(s):Chang, Yuchun(1); Wang, Tao(2); Yin, Fei(2); Wang, Jingwei(2); Song, Zhenyu(1); Wang, Yiding(1); Yin, Jingzhi(1)Source: Infrared Physics and Technology Volume: 54 Issue: 6 DOI: 10.1016/j.infrared.2011.07.009 Published: November 2011Abstract:A type-II InAs/GaSb superlattice (SL) was grown on Te-doped (1 0 0) GaSb substrate by low pressure metal organic chemical vapor deposition (LP-MOCVD). The samples were obtained at different growth temperatures and with different interface layers. By introducing an InAsSb interface layer between InAs and GaSb, a good surface morphology of the superlattice was achieved when the sample growth temperature was around 500-520 °C. The photoluminescence (PL) peak wavelength of the sample was 10.7 μm at 77 K, with FWHM of ∼30 meV. © 2011 Elsevier B.V. All rights reserved.Accession Number: 20114114413595 -
Record 29 of
Title:Predictive filter-based relative attitude and position determination for rendezvous and docking between spacecrafts
Author(s):Yang, Shao-Dong(1,2); Wen, De-Sheng(1); Ma, Jun-Yong(1,2); Sun, Jing(1,2)Source: Yuhang Xuebao/Journal of Astronautics Volume: 32 Issue: 8 DOI: 10.3873/j.issn.1000-1328.2011.08.006 Published: August 2011Abstract:A predictive filtering algorithm for real-time attitude and position determination with high accuracy and strong robustness is proposed in this paper. Based the line-of-sight measurement of Vision-based Navigation, a system errors model is established to predict the angular rate and linear rate one step and then the relative attitude and position between spacecrafts are accurately estimated. What is more, the predicted attitude and position are modified and updated by using Kalman gain and performance of algorithm is improved. Results of simulation based rendezvous and docking show that predictive filtering can accurately estimate the relative attitude and position, and the modified algorithm give a better result. The accuracy meets the requirement for rendezvous and docking. It has an important reference value for in-orbit experiment.Accession Number: 20113814351369 -
Record 30 of
Title:Influences of sinusoidal component on typical phase masks used to realize wave-front coding technique
Author(s):Zhao, Hui(1); Yi, Hongwei(1); Li, Yingcai(1)Source: ICEOE 2011 - 2011 International Conference on Electronics and Optoelectronics, Proceedings Volume: 1 Issue: DOI: 10.1109/ICEOE.2011.6013059 Published: 2011Abstract:The key of wave-front coding lies in the design of suitable phase masks. In our recent research, by combining a sinusoidal component with the cubic phase mask, a new mask called cubic sinusoidal phase mask, abbreviated as CSPM is proposed and can enhance the DOF (depth of field) extension capability of cubic mask. However, that work needs further expansion. First, only the cubic phase mask is selected to demonstrate the effectiveness of sinusoidal component in improving the performance of wave-front coded imaging system, but this is not enough; second, several constraints, which are adopted to simplify the CSPM optimization, should be eliminated. In this paper, the researches have been expanded based on the two points mentioned above and the sinusoidal component is indeed useful for improving DOF extension capability of existing phase masks. © 2011 IEEE.Accession Number: 20114014386180 -
Record 31 of
Title:Local adaptive dictionary based image denoising
Author(s):Tang, Yi(1); Yuan, Yuan(1); Yan, Pingkun(1); Li, Xuelong(1); Zhou, Hui(2); Li, Luoqing(2)Source: 1st Asian Conference on Pattern Recognition, ACPR 2011 Volume: Issue: DOI: 10.1109/ACPR.2011.6166564 Published: 2011Abstract:In this paper, the problem of balancing the noise removing and the image details preserving is considered. To remove noise adaptively, local dictionaries and sparse coding techniques are used. For a noised image patch, the local dictionary corresponding to it and the sparse coding technique are used to generate the sparse coding vector of the given patch. Then the noise of the given patch can be removed without any information on noise level by setting all components be zero but preserving largest component of the sparse coding vector. Because too much information on image details are removed with noise by the above process, a local weighted regression is adopted to refine the denoising image with the help of the information on the local geometry structure of noised image. Various experiments have been accomplished and prove our method to be effective in balancing the noise removing and the image details preserving. © 2011 IEEE.Accession Number: 20122715188506 -
Record 32 of
Title:Image denoising via weight regression
Author(s):Tang, Yi(1); Yuan, Yuan(1); Yan, Pingkun(1); Li, Xuelong(1); Zhou, Hui(2); Li, Luoqing(2)Source: 1st Asian Conference on Pattern Recognition, ACPR 2011 Volume: Issue: DOI: 10.1109/ACPR.2011.6166565 Published: 2011Abstract:The core of image denoising is making a trade-off between removing noise and preserving details of noised image. To remove noise, the denoising algorithm based on K-SVD is employed in this paper. Though the power of such denoising algorithm has been verified by a mount of experiments, many meaningful details of noised image cannot be well maintained. To preserve details of noised image, therefore, local structure information of noised image which is described by the steering kernel is considered in image denoising. In fact, a weighted regression method where the weights are defined by the steering kernel is used to recover the meaningful details of noised image. Experimental results have shown that more meaningful details of noised image are preserved by the proposed algorithm. © 2011 IEEE.Accession Number: 20122715188507 -
Record 33 of
Title:The competition of the retraction and capillary forces during the dna molecules moving within channels
Author(s):Hui, Dan(1); Wang, Kaige(1); Zhao, Xiaojuan(1); Qiao, Qiwei(1); Li, Dan(1); Dang, Weijun(1); Wan, Yun(2); Bai, Jin Tao(1)Source: Key Engineering Materials Volume: 483 Issue: DOI: 10.4028/www.scientific.net/KEM.483.331 Published: 2011Abstract:The stretching processes of DNA molecules on the hydrophobic planar surfaces and the dynamic processes of DNA molecules moving into the micro- and nano-channels were studied with the fluorescence microscopy associated with the EMCCD in detail. The results demonstrated the ordered stretching of single DNA molecules under the effects of hydrophobic force, which is one of the main force should be considered when the DNA molecules are driven into channels or other nano-structure patterns. © (2011) Trans Tech Publications.Accession Number: 20113114190325 -
Record 34 of
Title:The microstructure of zinc oxide films prepared by hydrothermal method
Author(s):Xia, Zhilin(1,2); Xu, Qi(2); Zhao, Lixin(2)Source: Advanced Materials Research Volume: 306-307 Issue: DOI: 10.4028/www.scientific.net/AMR.306-307.1238 Published: 2011Abstract:In the solutions which are prepared by mixing zinc nitrate hexahydrate, strong ammonia and methenamine in water bath at 90 Centigrade, lamellate and granular zinc oxide films have grown on different substrates such as B270 glass, glass based PAA films, pure aluminum foil and aluminum based PAA films. Films microstructures were characterized by scanning electron microscope (SEM). The influences of substrate and pH on the films microstructure were analyzed. Results reflect that: Ammonia plays an important role in the growing competition of grainy crystal; the more concentration of ammonia, the more zinc oxide crystals grow into granular. Because of the high specific area and adsorption capacity, lacunaris zinc oxide films have great application perspective in gas sensor, catalyzed sorption and biochemistry. © (2011) Trans Tech Publications, Switzerland.Accession Number: 20113914368216 -
Record 35 of
Title:Two dimensional principal components of natural images and its application
Author(s):Wang, Dong(1); Lu, Huchuan(1); Li, Xuelong(1,2)Source: Neurocomputing Volume: 74 Issue: 17 DOI: 10.1016/j.neucom.2011.03.047 Published: October 2011Abstract:In this paper, two dimensional principal components of natural images (2D-PCs) are proposed. Similar to principal components of natural images (1D-PCs), 2D-PCs can also be viewed as fundamental components of human's receptive field because they contain edge-like, bar-like and grating-like patterns. However, compared to 1D-PCs, 2D-PCs are of surprising symmetry, stable regularity, good interpretability, and have little computational complexity in real applications. Then, based on 1D-PCs and 2D-PCs, we design two kinds of statistical texture features (STF(1D) and STF(2D)), and apply them to multi-class facial expression recognition. Numerous experimental results demonstrate that our statistical texture features are better or not worse than other popular features for facial expression recognition. © 2011 Elsevier B.V.Accession Number: 20113814357572 -
Record 36 of
Title:Selection of interpolation methods used to mitigate spectral misregistration of imaging spectrometers
Author(s):Chen, Xu(1,2); Xiang, Yang(1); Feng, Yu-Tao(3)Source: Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis Volume: 31 Issue: 4 DOI: 10.3964/j.issn.1000-0593(2011)04-1147-04 Published: April 2011Abstract:Spectral curvature destroys the co-registration of the spectra measured by dispersion imaging spectrometer. Using interpolation to re-sample the measured spectra at the non-offset mid-wavelengths can mitigate the spectral misregistration. It is very important to select an optimum interpolation method. The performances of six common interpolation methods are evaluated by comparing the residual errors in the corrected spectral radiance. The results indicate that, four-point cubic Lagrange interpolation and cubic spline interpolation are better than other four interpolation methods (linear Interpolation, three points quadratic polynomial interpolation, five points four-order Lagrange interpolation and cubic Hermite interpolation). For spectral offset of 10% Δλ(Δλ=5 nm), the normalized errors in measured spectral radiance is PV=0.06, that is reduced to PV0.035. Furthermore, for lower spectral resolution (Δλ>5 nm), cubic Lagrange interpolation is a little better than cubic spline interpolation; while for higher spectral resolution (ΔλAccession Number: 20112013989985