2016
2016
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Record 421 of
Title:Two-step matching strategy combining global-local descriptor
Author(s):Qian, Tang(1,2); Bo, Liu(2); Xu, Zhaohui(2); Bei, Cao(2)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 10033 Issue: DOI: 10.1117/12.2244153 Published: 2016Abstract:Feature description and matching are at the base of many computer vision applications. However, traditional local descriptors cannot fully describe all information of features, and there are so many feature points and so long local descriptors that the matching steps are time-consuming. In order to solve these problems. This paper proposed a new efficient method for description and matching, called TSMwGLD (the two-step matching with global and local Descriptors). In TSMwGLD, first, it designed a simple global descriptor and then found N best-matching points by using global descriptors, and at the same time it could eliminate lots of points which didn't match in global information. Next, the method continued the matching step to find the best-matching point by using the local descriptors of N candidate points. So the whole matching process could become faster because the distances between global descriptors with the size of 8 were computed more easily than local descriptors with the size of 64 in SURF. The experimental results show that TSMwGLD results in increased accuracy and faster matching than original method. Especially for blurred images with textures, the matching time is less than tenth of original and the whole description and matching process is about two times faster than SURF. ? 2016 SPIE.Accession Number: 20164903101469 -
Record 422 of
Title:Real time H.264 high definition videos encoding based on TMS320DM368 and a video quality evaluation framework
Author(s):Hao, Fusheng(1,2); Huang, Jijiang(2); Wei, Liu(2); Wang, Yanan(1,2); Yang, Hongtao(2); Cao, Jianzhong(2)Source: Proceedings of 2016 IEEE Advanced Information Management, Communicates, Electronic and Automation Control Conference, IMCEC 2016 Volume: Issue: DOI: 10.1109/IMCEC.2016.7867186 Published: February 28, 2017Abstract:This paper presents a framework for evaluating quality of video encoding algorithms. This technique works by collecting source videos, encoding the source videos with a given algorithm, and decoding the compressed sequences. The decoded video shall be measured with the original sources in a specific evaluation method and feedback to the algorithm. Under the guidance of this framework, an implementation based on embedded device is achieved. Firstly, we collect test source videos in two ways: the commonly used standard sequences and actual scenes captured by camera. Secondly, a popular video encoding standard, H.264, is realized on TMS320DM368, a digital media system-on-chip produced by TEXAS INSTRUMENTS (TI). Finally, peak signal-to-noise ratio (PSNR) is implemented and computed among different test sequences. In the experiments, we achieve the real time compression of high definition videos with an acceptable PSNR. The video quality framework also can be easily extended to other encoding algorithms. ? 2016 IEEE.Accession Number: 20171403534845 -
Record 423 of
Title:Corrigendum to 'Material research on the InGaAs-emitting-layer VECSEL grown on GaAs substrate' [Mater. Sci. Semicond. Process. 42 (2016) 283-287]
Author(s):Lin, Tao(1); Sun, Ruijuan(1); Sun, Hang(1); Guo, Enmin(1); Duan, Yupeng(2); Lin, Nan(3); Ma, Xiaoyu(3); Wang, Yonggang(4)Source: Materials Science in Semiconductor Processing Volume: 47 Issue: DOI: 10.1016/j.mssp.2016.03.030 Published: June 1, 2016Abstract:nullAccession Number: 20161502231076 -
Record 424 of
Title:Low-Rank Preserving Projections
Author(s):Lu, Yuwu(1,2); Lai, Zhihui(3,4); Xu, Yong(2); Li, Xuelong(5); Zhang, David(6); Yuan, Chun(1)Source: IEEE Transactions on Cybernetics Volume: 46 Issue: 8 DOI: 10.1109/TCYB.2015.2457611 Published: August 2016Abstract:As one of the most popular dimensionality reduction techniques, locality preserving projections (LPP) has been widely used in computer vision and pattern recognition. However, in practical applications, data is always corrupted by noises. For the corrupted data, samples from the same class may not be distributed in the nearest area, thus LPP may lose its effectiveness. In this paper, it is assumed that data is grossly corrupted and the noise matrix is sparse. Based on these assumptions, we propose a novel dimensionality reduction method, named low-rank preserving projections (LRPP) for image classification. LRPP learns a low-rank weight matrix by projecting the data on a low-dimensional subspace. We use the L21 norm as a sparse constraint on the noise matrix and the nuclear norm as a low-rank constraint on the weight matrix. LRPP keeps the global structure of the data during the dimensionality reduction procedure and the learned low rank weight matrix can reduce the disturbance of noises in the data. LRPP can learn a robust subspace from the corrupted data. To verify the performance of LRPP in image dimensionality reduction and classification, we compare LRPP with the state-of-the-art dimensionality reduction methods. The experimental results show the effectiveness and the feasibility of the proposed method with encouraging results. ? 2015 IEEE.Accession Number: 20153301174859 -
Record 425 of
Title:Image stitching based on ORB feature and RANSAC
Author(s):Wu, Yongqing(1); Su, Xiuqin(1); Hu, Xiaoli(1)Source: ICIC Express Letters, Part B: Applications Volume: 7 Issue: 7 DOI: Published: July 1, 2016Abstract:In this paper, we introduced an image stitching algorithm which is based on ORB (Oriented FAST and Rotated BRIEF) feature and RANSAC (Random Sample Consensus) algorithm. First, we use ORB feature and brute force algorithm to find correspondences between images. Second, we apply the RANSAC algorithm to estimating homography robustly. Finally, the algorithm blends the images according to the homography and the image feathering algorithm was engaged to remove the visible seams due to exposure differences. From the results of experiments, we can draw a conclusion that the algorithm we proposed can stitch images seamlessly with a low computation time. ? 2016, ICIC Express Letters Office. All rights reserved.Accession Number: 20162702570313 -
Record 426 of
Title:Improved artificial bee colony algorithm with randomized Halton sequence
Author(s):He, Zhen-An(1); Ma, Caiwen(1)Source: 2016 2nd IEEE International Conference on Computer and Communications, ICCC 2016 - Proceedings Volume: Issue: DOI: 10.1109/CompComm.2016.7924908 Published: May 10, 2017Abstract:The artificial bee colony (ABC) algorithm has gained popularity for solutions to many real-world complex problems because of its simplicity and efficiency. However, it is good at exploration but poor at exploitation and early gets trapped into local optimum in some case, which prevents the artificial bee colony algorithm from finding the final result accuracy and efficiently for complex problems. It's known to all that population initialization is an important factor affecting convergence performance of ABC. In this paper, a modified artificial bee colony algorithm with randomized Halton sequence was proposed. A series of experiments were performed on benchmark functions to testify the superiority of our proposed algorithm, and results were compared with other initialization algorithms including opposition-based learning, random initialization and chaotic initialization. The results indicate that our proposed algorithm provides higher solution accuracy and faster convergence speed. ? 2016 IEEE.Accession Number: 20172303742387 -
Record 427 of
Title:Reflectance and reflection phase of photonic crystal with anisotropic left-handed materials
Author(s):Kang, Yongqiang(1,2,3); Zhang, Chunmin(2); Yao, Baoli(3)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 10141 Issue: DOI: 10.1117/12.2250515 Published: 2016Abstract:The reflectance and reflection phase properties of one dimensional photonic crystals with anisotropic left-handed materials is investigated by transfer matrix method. It is demonstrated that the width of zero-n band gap is influenced by the incident angle, polarization, the proportion of lattice and the ratio of thickness?1/4?which is different from the zero-n band gap with isotropic left hand materials. The value of reflection phase is affected by incident angle and polarization and not affected by the proportion of lattice and the ratio of thickness. These characteristic may be useful for making photonic crystal phase compensators and the dispersion compensators. ? 2016 SPIE.Accession Number: 20165103156869 -
Record 428 of
Title:Radiometric calibration of space remote sensing camera
Author(s):Guo, Huinan(1); Yang, Hongtao(1); Song, Xiaodong(1); Zhao, Ronghui(1); Ma, Nan(2); Wang, Wei(3)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 10033 Issue: DOI: 10.1117/12.2245147 Published: 2016Abstract:Radiometric calibration is an important part for space remote sensing camera to obtain an accurate radiation value of ground target. The main significance of radiometric calibration is to reduce the influence by external scene and internal parameters of camera and to recover the real radiation property of objects. In order to break the limitation of line array imaging sensor, we propose a radiometric calibration method based on camera state matrix for area array camera. According to camera response characteristics, calculate and fit a functional relationship between the input radiance energy and the output digital number. Meanwhile, analyse and describe the procedure of radiometric calibration in detail. Experimental results indicates that the calibration method can provide high accuracy linear fitting parameters and can be widely applied to a large variety digital imaging systems. ? 2016 SPIE.Accession Number: 20164903101585 -
Record 429 of
Title:Effect of energy density and feeding speed on micro-holes drilling in SiC/SiC composites by picosecond laser
Author(s):Liu, Yongsheng(1); Wang, Jing(1); Li, Weinan(2); Wang, Chunhui(1); Zhang, Qing(1); Yang, Xiaojun(2); Cheng, Laifei(1)Source: International Journal of Advanced Manufacturing Technology Volume: 84 Issue: 9-12 DOI: 10.1007/s00170-015-7844-1 Published: June 1, 2016Abstract:Picosecond laser machining is an important modern technology for materials with high hardness. In this paper, micro-holes with several hundred micrometer diameter were drilled in SiC/SiC composite using picosecond laser, and the quality of the micro-holes under different machining parameters was investigated in detail. The results indicated that energy density and feeding speed had remarkable effect on the micro-hole quality. The roundness of the micro-holes on the laser entry side was rarely affected by energy density and feeding speed. However, the roundness of the micro-holes on the laser exit side and micro-hole diameters along processing direction were quite sensitive to the energy density and feeding speed. Feeding speed had little influence on the quality of drilling holes, except for more debris on the entry side with 11.2?μm/s feeding speed. ? 2015, Springer-Verlag London.Accession Number: 20154301432902 -
Record 430 of
Title:Laser parameter precision diagnostic system of large-aperture high power laser experiment platform
Author(s):Xia, Yanwen(1); Zheng, Kuixing(1); Da, Zhengshang(2); Li, Hongguang(2); Zhao, Junpu(1); Sun, Zhihong(1); Peng, Zhitao(1); Wang, Zhengzhou(2); Liu, Hua(1); Liang, Yue(1); Li, Sen(1); Zheng, Xiaoxia(2); Wei, Xiaofeng(1)Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering Volume: 45 Issue: 12 DOI: 10.3788/IRLA201645.1217008 Published: December 25, 2016Abstract:A multi-functional high-precision comprehensive diagnostic system for laser parameters was developed. The entire diagnostic system was composed of a fundamental frequency laser diagnostic module, a tripled frequency laser diagnostic module, an online optic damage inspection module, an opening frequency conversion unit and corresponding auxiliary units. Under the control of the system software, it can automatically perform accurate measurement, data collection, storage and processing on laser parameters such as near-field, far-field, energy, wavefront and pulse-waveform before and after the laser frequency conversion. This system provides accurate data for improving laser facility load capacity and researching relevant key unit technology. ? 2016, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.Accession Number: 20170403269615 -
Record 431 of
Title:Preface
Author(s):Tan, Tieniu(1); Li, Xuelong(2); Chen, Xilin(1); Zhou, Jie(3); Yang, Jian(4); Cheng, Hong(5)Source: Communications in Computer and Information Science Volume: 663 Issue: DOI: Published: 2016Abstract:nullAccession Number: 20164703028100 -
Record 432 of
Title:Multifrequency sources of quantum correlated photon Pairs on-chip: A path toward integrated Quantum Frequency Combs
Author(s):Caspani, Lucia(1,2); Reimer, Christian(1); Kues, Michael(1); Roztocki, Piotr(1); Clerici, Matteo(1,4); Wetzel, Benjamin(1,5); Jestin, Yoann(1); Ferrera, Marcello(1,2); Peccianti, Marco(2,4); Pasquazi, Alessia(2,4); Razzari, Luca(1); Little, Brent E.(6); Chu, Sai T.(7); Moss, David J.(8); Morandotti, Roberto(1,3)Source: Nanophotonics Volume: 5 Issue: 2 DOI: 10.1515/nanoph-2016-0029 Published: June 1, 2016Abstract:Recent developments in quantum photonics have initiated the process of bringing photonic-quantumbased systems out-of-the-lab and into real-world applications. As an example, devices to enable the exchange of a cryptographic key secured by the laws of quantum mechanics are already commercially available. In order to further boost this process, the next step is to transfer the results achieved by means of bulky and expensive setups into miniaturized and affordable devices. Integrated quantum photonics is exactly addressing this issue. In this paper, we briefly review the most recent advancements in the generation of quantum states of light on-chip. In particular, we focus on optical microcavities, as they can offer a solution to the problem of low efficiency that is characteristic of the materials typically used in integrated platforms. In addition, we show that specifically designed microcavities can also offer further advantages, such as compatibility with telecom standards (for exploiting existing fibre networks) and quantum memories (necessary to extend the communication distance), as well as giving a longitudinal multimode character for larger information transfer and processing. This last property (i.e., the increased dimensionality of the photon quantum state) is achieved through the ability to generate multiple photon pairs on a frequency comb, corresponding to the microcavity resonances. Further achievements include the possibility of fully exploiting the polarization degree of freedom, even for integrated devices. These results pave the way for the generation of integrated quantum frequency combs that, in turn, may find important applications toward the realization of a compact quantum-computing platform. ? 2016 Lucia Caspani et al., published by De Gruyter Open.Accession Number: 20162602542450