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Imaging of dielectric targets with metallic inclusions by means of a prototype of microwave axial tomograph 用微波轴向层析成像原型机成像含金属夹杂的介质目标
2012 IEEE International Conference on Imaging Systems and Techniques Proceedings Pub Date : 2012-07-16 DOI: 10.1109/IST.2012.6295493
A. Salvadè, R. Monleone, A. Massimini, S. Poretti, M. Maffongelli, M. Pastorino, A. Randazzo
{"title":"Imaging of dielectric targets with metallic inclusions by means of a prototype of microwave axial tomograph","authors":"A. Salvadè, R. Monleone, A. Massimini, S. Poretti, M. Maffongelli, M. Pastorino, A. Randazzo","doi":"10.1109/IST.2012.6295493","DOIUrl":"https://doi.org/10.1109/IST.2012.6295493","url":null,"abstract":"Microwave systems are becoming powerful tools for imaging applications. In fact, when designed by taking into account the full scattering phenomena, they are able to directly provide information about the physical properties of the target under test. In this paper, the possibility of detecting metallic inclusions inside dielectric objects is assessed by using a prototype of a microwave axial tomograph, which is able to create images of the dielectric permittivity and of the electric conductivity of the inspected target.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116207595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhanced spatial resolution for EDXRD inspection methods by reconstruction from multiple measurements EDXRD检测方法的空间分辨率提高
2012 IEEE International Conference on Imaging Systems and Techniques Proceedings Pub Date : 2012-07-16 DOI: 10.1109/IST.2012.6295529
S. Schlesinger, H. Bomsdorf
{"title":"Enhanced spatial resolution for EDXRD inspection methods by reconstruction from multiple measurements","authors":"S. Schlesinger, H. Bomsdorf","doi":"10.1109/IST.2012.6295529","DOIUrl":"https://doi.org/10.1109/IST.2012.6295529","url":null,"abstract":"Energy Dispersive X-Ray Diffraction (EDXRD) in transmission geometry enables spatially localized measurements on extended objects and is favorably used in airport baggage inspection systems. Here, a method is presented to improve their comparably low spatial resolution in the direction of the incident beam by performing a one-dimensional object scan instead of a single data acquisition. The series of measurements taken under different object positions allows reconstruction of the signal contributions from individual voxels at a significantly enhanced resolution. The type of reconstruction used can be regarded as a two-dimensional deconvolution or solving an inverse problem. Due to the specific shape of the convolution kernel the problem turns out to be ill-posed, and thus its solution using measured (noisy) data requires application of a suitable regularization method. Detailed studies on this issue led to the development of a novel iterative algorithm combining several deconvolution runs with preceding and intermediate image processing steps. The Tikhonov method was used for regularization. However, depending on the object under investigation the original Euclidean norm (least squares fit) was advantageously replaced by the 1-norm (least absolute deviation, LAD problem). The algorithm was tested using simulated and measured data sets of different material compositions under pencil beam irradiation. The results demonstrate the significant increase in spatial resolution achieved by means of the method.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125218237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Infrared photon discrimination of lung cancer cells 肺癌细胞的红外光子识别
2012 IEEE International Conference on Imaging Systems and Techniques Proceedings Pub Date : 2012-07-16 DOI: 10.1109/IST.2012.6295599
G. Giakos, S. Shrestha, J. Petermann, C. Narayan, S. Marotta, A. Despande, J. Syms, T. Farrahi, A. Blinzler, R. Picard, W. Inbody, P. Dao, P. Crabtree, P. Mcnicholl, L. Zhang, A. Zhou, M. Zervakis, M. Kounelakis, E. Bei, G. Livanos
{"title":"Infrared photon discrimination of lung cancer cells","authors":"G. Giakos, S. Shrestha, J. Petermann, C. Narayan, S. Marotta, A. Despande, J. Syms, T. Farrahi, A. Blinzler, R. Picard, W. Inbody, P. Dao, P. Crabtree, P. Mcnicholl, L. Zhang, A. Zhou, M. Zervakis, M. Kounelakis, E. Bei, G. Livanos","doi":"10.1109/IST.2012.6295599","DOIUrl":"https://doi.org/10.1109/IST.2012.6295599","url":null,"abstract":"The objective of this study is to explore the polarimetric phenomenology of near infrared light interaction with healthy and lung cancer monolayer cells by using efficient polarimetric transmission detection techniques. Preliminary results indicate that enhanced discrimination between normal and different types of lung cancer cell stages can be achieved based on their transmitted intensities and depolarization properties of the cells. Specifically, the sizes of the nuclei of the cancer cells and the nucleus-to-cytoplasmic ratios appear to have potential impact on the detected polarimetric signatures leading to enhanced discrimination of lung cancer cells.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127642297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Improving the robustness in feature detection by local contrast enhancement 利用局部对比度增强提高特征检测的鲁棒性
2012 IEEE International Conference on Imaging Systems and Techniques Proceedings Pub Date : 2012-07-16 DOI: 10.1109/IST.2012.6295482
Vassilios Vonikakis, Dimitris Chrysostomou, R. Kouskouridas, A. Gasteratos
{"title":"Improving the robustness in feature detection by local contrast enhancement","authors":"Vassilios Vonikakis, Dimitris Chrysostomou, R. Kouskouridas, A. Gasteratos","doi":"10.1109/IST.2012.6295482","DOIUrl":"https://doi.org/10.1109/IST.2012.6295482","url":null,"abstract":"This paper presents a new feature detector, with improved local contrast performance. The proposed method is based on an improved non-linear version of the classic Difference of Gaussians, which exhibits increased sensitivity to low contrast. Additionally, it does not employ computationally expensive or memory demanding routines. In order to evaluate the degree of illumination invariance that the proposed, as well as, other existing detectors exhibit, a new benchmark image database has been created. It features a greater variety of imaging conditions, compared to existing databases, containing real scenes under various degrees and combinations of uniform and non-uniform illumination. Experimental results show that the proposed detector extracts greater number of features, with high level of repeatability, compared to other existing ones. These results are evident for both uniform and non-uniform illumination, evincing a favorable usage of the proposed feature detector by robotic platforms working in outdoor working environments.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117052064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 32
Development and application of ECT digital system for online flow measurement ECT数字流量在线测量系统的开发与应用
2012 IEEE International Conference on Imaging Systems and Techniques Proceedings Pub Date : 2012-07-16 DOI: 10.1109/IST.2012.6295499
Z. Cui, Huaxiang Wang, Chengyi Yang, Dongfeng Zhang, Yide Geng
{"title":"Development and application of ECT digital system for online flow measurement","authors":"Z. Cui, Huaxiang Wang, Chengyi Yang, Dongfeng Zhang, Yide Geng","doi":"10.1109/IST.2012.6295499","DOIUrl":"https://doi.org/10.1109/IST.2012.6295499","url":null,"abstract":"The paper presents the latest development of a digital-based measurement system for electrical capacitance tomography (ECT), that consists of a high-capacity FPGA and fast digital converters. In this system, most functions, e.g. signal generation, phase-sensitive demodulator and low-pass filters, are implemented digitally in FPGA. Tomographic software in Visual C++ has been developed for real-time data acquisition, image re-construction and visualization and parameter calculation. Having been specially optimized for ECT measurement, the custom-built hardware and software are capable of achieving acquisition rate of >; 1000fps. The developed ECT system has been applied in online monitoring of a pneumatic conveying system that is to be used for mine out area refilling. Regional flow parameters could be obtained according to specific subregion division. In addition, having been tested on the pneumatic conveying system for several days, the ECT system is proved to be reliable and durable.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121424867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Measurement of lens shutter's switching time in full frame cameras 全画幅相机镜头快门切换时间的测量
2012 IEEE International Conference on Imaging Systems and Techniques Proceedings Pub Date : 2012-07-16 DOI: 10.1109/IST.2012.6295520
Yanyan Zhao, Yan Yuan, Lijuan Su, Fengzhen Huang, Siyuan Zhang
{"title":"Measurement of lens shutter's switching time in full frame cameras","authors":"Yanyan Zhao, Yan Yuan, Lijuan Su, Fengzhen Huang, Siyuan Zhang","doi":"10.1109/IST.2012.6295520","DOIUrl":"https://doi.org/10.1109/IST.2012.6295520","url":null,"abstract":"As an photoelectric remote sensing device, the full frame camera is widely used in aviation photography, which can get an image in one exposure time but has the disadvantage of image smearing caused by platform motion during exposing. A mechanical lens shutter is implemented in camera's system to control the exposure time precisely. In this paper, the designing principle of a lens shutter based on rotary solenoid was analyzed and a measurement method for the shutter's switching time was proposed. A laboratory set of shutter and a testing unit based on photo detector was set up, and the shutter's opening duration, closing duration and switching delay time were measured. The experimental data was analyzed and the result indicated that error of switching time is acceptable and this kind of mechanical lens shutter is with good stability. This shutter has small volume, light weight, simple structure and low power consumption, and is very suitable for airborne full frame camera.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122600528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of optical system distortion on LASIS data 光学系统畸变对LASIS数据的影响
2012 IEEE International Conference on Imaging Systems and Techniques Proceedings Pub Date : 2012-07-16 DOI: 10.1109/IST.2012.6295513
Juanjuan Jing, Ruyi Wei, Tao Yu, Qunbo Lv, Jinsong Zhou, Le Wang
{"title":"Influence of optical system distortion on LASIS data","authors":"Juanjuan Jing, Ruyi Wei, Tao Yu, Qunbo Lv, Jinsong Zhou, Le Wang","doi":"10.1109/IST.2012.6295513","DOIUrl":"https://doi.org/10.1109/IST.2012.6295513","url":null,"abstract":"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.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128745959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A MEMS ultrasonic transducer imager array with beam width, acoustic power, and frequency modulations 具有波束宽度、声功率和频率调制的MEMS超声换能器成像仪阵列
2012 IEEE International Conference on Imaging Systems and Techniques Proceedings Pub Date : 2012-07-16 DOI: 10.1109/IST.2012.6295533
T. Emadi, G. Thomas, D. Buchanan, S. Pistorius
{"title":"A MEMS ultrasonic transducer imager array with beam width, acoustic power, and frequency modulations","authors":"T. Emadi, G. Thomas, D. Buchanan, S. Pistorius","doi":"10.1109/IST.2012.6295533","DOIUrl":"https://doi.org/10.1109/IST.2012.6295533","url":null,"abstract":"Capacitive micromachined ultrasonic transducers (CMUTs) are an alternative imager system to the conventional piezoelectric transducers. They benefit from microfabrication techniques that offer developing CMUTs in various shapes and dimensions, as well as 1- and 2-D arrays. In this work, a CMUT imager array is designed and structurally optimized for `water tree' detection in the XLPE underground power cable insulation. COMSOL simulations are performed, indicating the ability of such an array in beam width modulation through electrically addressing of CMUT cells in different orders. It is also shown that unlike piezoelectric transducers, a MEMS transducer can also operate at a relatively wider frequency range.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126748442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
A novel Fresnlet based robust data hiding algorithm for medical images 一种新的基于Fresnlet的医学图像鲁棒数据隐藏算法
2012 IEEE International Conference on Imaging Systems and Techniques Proceedings Pub Date : 2012-07-16 DOI: 10.1109/IST.2012.6295590
M. Nazeer, Dai-Gyoung Kim
{"title":"A novel Fresnlet based robust data hiding algorithm for medical images","authors":"M. Nazeer, Dai-Gyoung Kim","doi":"10.1109/IST.2012.6295590","DOIUrl":"https://doi.org/10.1109/IST.2012.6295590","url":null,"abstract":"Robust solutions are recently needed to handle the unusual modification of extensively distributed medical information images. If a medical information image is modified, it may cause to have wrong diagnosis that may arouse a serious problem. Moreover, medical images of digital form are easy to alter for illegal purposes. For instance, by wiping off or adding small information intentionally, it is possible to modify the digital medical images for certain illegal purposes; like insurance claims etc. Hence, the reliability of medical image is an important criterion in a Hospital Information System (HIS). In this paper Fresnelet transform is used for secure distribution of medical images based on Fresnelet coefficient. The experimental results exhibit the high imperceptibility for host image and the significant robustness of embedded image.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116071807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Infrared image system for microelectronic devices: Auto focus and image correlation techniques 用于微电子设备的红外成像系统:自动对焦和图像相关技术
2012 IEEE International Conference on Imaging Systems and Techniques Proceedings Pub Date : 2012-07-16 DOI: 10.1109/IST.2012.6295497
D. Florian, H. Kock, K. Plankensteiner, M. Glavanovics
{"title":"Infrared image system for microelectronic devices: Auto focus and image correlation techniques","authors":"D. Florian, H. Kock, K. Plankensteiner, M. Glavanovics","doi":"10.1109/IST.2012.6295497","DOIUrl":"https://doi.org/10.1109/IST.2012.6295497","url":null,"abstract":"An infrared (IR) microscope camera system is used to measure the temperature distribution of power devices. In general, a microscope camera system contains a fixed lens; this means the whole camera has to be moved to detect focus images. During the heating up or cooling down process the thermo-mechanical expansion influences the measurement results. For the calibration, a pixel-by-pixel registration of individual images is required. The issues concerning finding the focus image and guarantee a pixel-by-pixel overlap in the image sequence are solved by the proposed auto focus and the image correlation algorithm. To detect the focus position and corresponding focus image, passive focusing is used, where a focus curve is recorded. The gradient operator is used to compute the focus value. Image registration is applied to compute the distortion between the images and guarantee a pixel-by-pixel overlap. In our case, the most significant parameter is the displacement, hence a simple image correlation algorithm is implemented.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115233647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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