2013
2013
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Record 253 of
Title:Linear tracking for 3-D medical ultrasound imaging
Author(s):Huang, Qing-Hua(1); Yang, Zhao(2); Hu, Wei(1); Jin, Lian-Wen(2); Wei, Gang(1); Li, Xuelong(3)Source: IEEE Transactions on Cybernetics Volume: 43 Issue: 6 DOI: 10.1109/TSMCC.2012.2229270 Published: December 2013Abstract:As the clinical application grows, there is a rapid technical development of 3-D ultrasound imaging. Compared with 2-D ultrasound imaging, 3-D ultrasound imaging can provide improved qualitative and quantitative information for various clinical applications. In this paper, we proposed a novel tracking method for a freehand 3-D ultrasound imaging system with improved portability, reduced degree of freedom, and cost. We designed a sliding track with a linear position sensor attached, and it transmitted positional data via a wireless communication module based on Bluetooth, resulting in a wireless spatial tracking modality. A traditional 2-D ultrasound probe fixed to the position sensor on the sliding track was used to obtain real-time B-scans, and the positions of the B-scans were simultaneously acquired when moving the probe along the track in a freehand manner. In the experiments, the proposed method was applied to ultrasound phantoms and real human tissues. The results demonstrated that the new system outperformed a previously developed freehand system based on a traditional six-degree-of-freedom spatial sensor in phantom and in vivo studies, indicating its merit in clinical applications for human tissues and organs. ? 2013 IEEE.Accession Number: 20135117095030 -
Record 254 of
Title:Optical storage properties of different fulgides
Author(s):Chao, Lumen(1); Menke, Neimule(1,2); Yao, Baoli(3); Lei, Ming(3); Wang, Yingli(3); Sun, Xiaoman(1); Chen, Yi(4)Source: Advanced Materials Research Volume: 660 Issue: DOI: 10.4028/www.scientific.net/AMR.660.24 Published: 2013Abstract:As one kind of organic photochromic optical storage material, fulgides are well-known for their thermally irreversibility. In this paper, two kinds of new fulgide materials, like pyrrylfulgide/PMMA film and 3-indoly-benzylfulgimide/PMMA film are used as storage materials. Different kinds of optical storage properties, like photosensitive spectral range, light sensitivity, resolution, fatigue resistance and thermal stability of them are measured. The experimental results show that for pyrrylfulgide and 3-indoly-benzylfulgimide, their photosensitive spectral range were 500nm~780nm and 480nm~720nm respectively; their maximum absorption were at 626nm and 573nm respectively; under 633nm light excitation, their light reaction constants of bleaching process on the exciting light polarization direction were 1.4×10-3cm2/mJ and 2.89×10-3cm2/mJ respectively; their resolution were both higher than 1680 lines/mm; they can be recycled more than 33 times and 70 times respectively; at room temperature they can be stored for 12 months and 14 months respectively. And it is concluded that pyrrylfulgide and 3-indoly-benzylfulgimide show better application potential in the field of rewriteable optical storage. ? 2013 Trans Tech Publications, Switzerland.Accession Number: 20131116108217 -
Record 255 of
Title:A new super-resolution reconstruction algorithm based on block sparse representation
Author(s):Zhao, Xiao Dong(1,2); Cao, Jian Zhong(1); Zhang, Hui(1); Liu, Guang Sen(1); Wang, Hua(1); Liu, Qing(1)Source: Advanced Materials Research Volume: 710 Issue: DOI: 10.4028/www.scientific.net/AMR.710.603 Published: 2013Abstract:In this paper, we propose a new single super-resolution (SR) reconstruction algorithm via block sparse representation and regularization constraint. Firstly, discrete K-L transform is used to learn compression sub-dictionary according to the specific image block. Combined with threshold choice of training data, the transform bases are generated adaptively corresponding to the sparse domain. Secondly, Non-local Self-similarity (NLSS) regularization term is introduced into sparse reconstruction objective function as a prior knowledge to optimize reconstruction result. Simulation results validate that the proposed algorithm achieves much better results in PSNR and SSIM. It can both enhance edge and suppress noise effectively, which proves better robustness. ? (2013) Trans Tech Publications, Switzerland.Accession Number: 20133016530677 -
Record 256 of
Title:Compressive sampling spectral modulated technique
Author(s):Sun, Lang(1); Hu, Bing-Liang(1); Wang, Shuang(1); Yan, Peng(1); Feng, Yu-Tao(1); Sun, Nian(1)Source: Guangzi Xuebao/Acta Photonica Sinica Volume: 42 Issue: 8 DOI: 10.3788/gzxb20134208.0912 Published: August 2013Abstract:The compressive sampling spectral modulated technique is developed in order to avoid time penalty and promote throughput of spectral imaging system, and a digital-micromirror-device based compressive sampling multispectral imaging system is designed. In the technique based compressive sampling spectral information is sampled below Nyquist-criterion with coded aperture to reduce spectral data greatly. In the experiment, the cubic spatial/spectral data cubes of the 612 nm laser and colored striped fabric are reconstructed from 2-Dimension images obtained from detector that contain spectral information using double shrinkage fast iterative algorithm. The results indicate that a digital-micromirror-device based compressive sampling multispectral imaging system has images with high-throughput and high resolution, can compress the spectral simultaneously, and the compression ratio can reach 31:1.Accession Number: 20134216860589 -
Record 257 of
Title:Key technologies research of new generation concentrating photovoltaic
Author(s):Liu, Chun Tong(1); Bing, Li(1); Tao, Wang(2); Li, Hong Cai(1)Source: Advanced Materials Research Volume: 724-725 Issue: DOI: 10.4028/www.scientific.net/AMR.724-725.171 Published: 2013Abstract:The new concentrating photovoltaic (CPV) with core technology of III-V multi-junction cells, can significantly reduce the cost of photovoltaic system, and with advantages of high conversion rate, light weight, small size, energy saving and environmental protection, etc, which was widely regarded as the next-generation of solar photovoltaic technology. On the basis of the introduction of related research process, the paper concentrating discuss on the key technologies such as the new efficient multi-junction cells, high performance non-imaging concentrated light technology and sun tracking system, and propose the appropriate technical solutions, which can provide reference for the application and dissemination of the new generation concentrating photovoltaic. ? (2013) Trans Tech Publications, Switzerland.Accession Number: 20134016817716 -
Record 258 of
Title:Two approaches to improve FPGA performance for the stereo camera of the chang'e-1 satellite
Author(s):Duan, Yongqiang(1,2); Wen, Desheng(1); Gao, Wei(1); Zhao, Baochang(1)Source: IEEE Aerospace and Electronic Systems Magazine Volume: 28 Issue: 9 DOI: 10.1109/MAES.2013.6617095 Published: 2013Abstract:The CE-1 satellite was successfully launched on October 24, 2007, and was guided to crash-land on the Moon on March 1, 2009. The FPGA of the CCD stereo camera operated more than 1 year without faults, exceeding the expected life span by about 4 months. The first lunar image from CE-1 was obtained on November 20 and November 21, 2007, and was released on November 26, 2007 (Figure 14). A three-dimensional image was acquired by processing at the same time and released on November 26, 2007 (Figure 15). The raw data obtained by the CCD stereo camera included 508 orbit images between the latitudes of 70°N and 70°S and 589 polar orbit images. Many scientific results have been obtained by analyzing these data [26], especially the ?global lunar image from the first Chinese lunar exploration mission? in [27]. The results of the onboard flight validate that the FPGA design of the CCD stereo camera is reasonable and reliable and has achieved the mission requirements. ? 1986-2012 IEEE.Accession Number: 20134316876168 -
Record 259 of
Title:Research of a new all-optical solid-state scanner based on GaAs
Author(s):Xu, Guo Ya(1,2); He, Jun Hua(1); Sen, Fan(1,2); Zhu, Yuan Tao(1,2)Source: Advanced Materials Research Volume: 710 Issue: DOI: 10.4028/www.scientific.net/AMR.710.269 Published: 2013Abstract:Design an all-optical solid-state scanner chip, which can realize high speed light deflection in a very small space, instead of electron beam deflection scan image converter tube and opto-mechanical scanner, cancel the complicated mechanical components, use the all-optical scanning to realize the super fast phenomenon observation. The beam deflection system is based on semiconductor optical waveguide core layer carrier induced refractive index change effect to realize, its development work is mainly divided into semiconductor optical waveguide and saw prisms two parts. And through the experiment, we measured deflection angle of the scanner chip to 1053nm signal light. ? (2013) Trans Tech Publications, Switzerland.Accession Number: 20133016530607 -
Record 260 of
Title:Optimal design of a new type space laser communication optical system
Author(s):Yan, Pei-Pei(1); Deng, Xiao-Guo(1); Zhang, Heng-Jin(1)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 8906 Issue: DOI: 10.1117/12.2030551 Published: 2013Abstract:A design of a laser communications optical system with high transmitting and receiving performance is given. The traditional on-axis Cassegrain optical antenna has the default that the transmitting and receiving power decreased greatly because of the obscuration of the secondary mirror. Considering that the eccentric-pupil Cassegrain optical antenna is designed. The optical antenna system in transceiver has been designed by means of CODEV software. It improves the efficiency of transmitting and receiving power effectively. Its properties have been analyzed, such as gain, image quality, and transmission efficiency. Meanwhile, the materials of optical elements have been analyzed. The power decline curve has been obtained by means of the detailed analysis of antenna system in partial axis situation. The system includes transmitter channel, receiving channel and experiment channel. It can realize the functions of transmitter-receiver isolation and multi-light ways using dichroic mirrors and beam splitting prisms. The system volume and weight are reduced greatly. The complexity of conventional laser communication system is reduced enormously at the same time. It has important reference significance and application value. ? 2013 Copyright SPIE.Accession Number: 20141317501113 -
Record 261 of
Title:The application of auto-gated power supply in ICCD camera
Author(s):Bai, Zhe(1); Zhang, Jian(1); Fan, Xue-Wu(1); Xiang, Shi-Ming(2)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 8912 Issue: DOI: 10.1117/12.2034761 Published: 2013Abstract:Intensified CCD (ICCD) imagers have been widely used in low light level imaging system. While the ICCD has smaller dynamic range in ubiquity, and its output image is prone to saturation in high light level. In this paper, the auto-gated power supply method is put forward to implementing automatic brightness control (ABC). Consequently, the ICCD camera imaging dynamic range is improved. Firstly, the principle of the auto-gated power supply is described briefly, and the design scheme is carried out in detail. The pulse power control mode is adopted to the photocathode instead of the traditional high voltage DC power supply, and the analog adjustment mode is adopted to the micro channel plate (MCP). Secondly, an imaging experiment for ICCD camera was made to validate the auto-gated power supply design, and the experiment results are presented. The results indicated that the design is valid, and the auto-gated power supply method helps to improve the image quality of the ICCD camera. Finally, the key problems in the design are analyzed and summarized in detail. ? 2013 SPIE.Accession Number: 20141317521648 -
Record 262 of
Title:Stereo matching based on low-texture detection and disparity map fusion
Author(s):Cao, Xiaoqian(1,2); Ma, Caiwen(1)Source: Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument Volume: 34 Issue: 9 DOI: Published: September 2013Abstract:In order to eliminate the ambiguity of low-texture region matching, while preserve the matching rate of the texture regions, a novel stereo matching algorithm based on low-texture region detection and disparity map fusion is proposed. The procedure is proceed in the following way: first of all, the low texture region is detected based on the color or the grayscale of the input image; based on this result the improved epipolar distance transformation algorithm is used on the input image pair to improve the distinguishing ability of the pixels in the low-texture regions; and then the window matching algorithm and belief propagation algorithm are adopted to respectively calculate the disparity map for the original input image and the image after the improved epipolar distance transformation. At last, the initial disparity maps calculated from the original and the transformed image pairs are fused according to the detection results of the low-texture regions; and the synchronous optimal matching of the low-texture regions and the texture regions is achieved. The experiments on the low-textured images in the Middlebury image database indicate that the proposed algorithm improves the matching rate by at least 20% compared with the state of art algorithms, almost without increasing the calculation complexity; moreover, the algorithm also has robustness to the matching of the input image pair with luminance variation.Accession Number: 20134316894126 -
Record 263 of
Title:Design of calibration system for a great quantity of high precision scientific grade CCD cameras
Author(s):Tan, Jia-Hai(1); Li, Peng-Yu(2); Qu, You-Shan(1); Han, Ya-Meng(1); Yu, Ya-Li(3); Wang, Wei(1)Source: Applied Mechanics and Materials Volume: 331 Issue: DOI: 10.4028/www.scientific.net/AMM.331.326 Published: 2013Abstract:For the calibration of a great quantity of scientific grade CCD cameras in the high energy physics system, a scientific grade CCD camera calibration system with high precision and efficiency is designed. The designed camera calibration system consists of a 1053nm nanosecond solid-state laser, a knife, a double-integrating sphere, a laser power meter, a signal generator, a computer with its data processing software. Key technical parameters of scientific grade CCD under the condition of 1053nm optical pulses that are the modulation, contrast, defects, optical dynamic range, non-linear response can be calibrated by the designed calibration system. A double-integrating sphere with high uniformity and stability is designed as a uniform light source, which improves the calibrating performance and accuracy. Experimental results show the system designed in this paper can calibrate the large number of scientific grade CCD cameras quickly and efficiently. ? (2013) Trans Tech Publications, Switzerland.Accession Number: 20133516680712 -
Record 264 of
Title:Depth-aware image seam carving
Author(s):Shen, Jianbing(1); Wang, Dapeng(1); Li, Xuelong(2)Source: IEEE Transactions on Cybernetics Volume: 43 Issue: 5 DOI: 10.1109/TCYB.2013.2273270 Published: October 2013Abstract:Image seam carving algorithm should preserve important and salient objects as much as possible when changing the image size, while not removing the secondary objects in the scene. However, it is still difficult to determine the important and salient objects that avoid the distortion of these objects after resizing the input image. In this paper, we develop a novel depthaware single image seam carving approach by taking advantage of the modern depth cameras such as the Kinect sensor, which captures the RGB color image and its corresponding depth map simultaneously. By considering both the depth information and the just noticeable difference (JND) model, we develop an efficient JND-based significant computation approach using the multiscale graph cut based energy optimization. Our method achieves the better seam carving performance by cutting the near objects less seams while removing distant objects more seams. To the best of our knowledge, our algorithm is the first work to use the true depth map captured by Kinect depth camera for single image seam carving. The experimental results demonstrate that the proposed approach produces better seam carving results than previous content-aware seam carving methods. ? 2013 IEEE.Accession Number: 20135117116182