2012 IEEE International Conference on Imaging Systems and Techniques Proceedings最新文献

{"title":"Real-time single FPGA-based multimodal image fusion system","authors":"M. Bartyś, B. Putz, A. Antoniewicz, L. Zbrzezny","doi":"10.1109/IST.2012.6295564","DOIUrl":"https://doi.org/10.1109/IST.2012.6295564","url":null,"abstract":"The real-time hardware system called UFO intended for high quality registering and fusion of infrared (IR) and visible (VIS) images is presented in this paper. System UFO is principally suited for mobile applications. Of course, it can be also used on fixed platforms as well. Therefore, much effort has been spent to ensure appropriate low power consumption and robustness against harsh environments. Overview and discussion of the hardware structure of the UFO system is presented. Principally, the system was build around single, low power FPGA core. The proposed structure of the hardware is very clear and compact. Mixed solutions, based on applications of multiple FPGA and DSP processors, after discussion, have been rejected in spite of insufficient computational power. Some substantial reasons for this have been presented in this paper. Chosen image registering and fusion procedures have been implemented to proof technical quality of the system. Achieved experimental results certified the ability of the presented system for real-time applications.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"33 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":"124490837","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}

{"title":"Compensation of a transmitter's radiation pattern for synthetic transmit aperture acoustic imaging","authors":"N. Laokulrat, Y. Maeda, M. Sugimoto, H. Hashizume","doi":"10.1109/IST.2012.6295523","DOIUrl":"https://doi.org/10.1109/IST.2012.6295523","url":null,"abstract":"In an acoustic imaging system, ultrasonic transmitters always have uneven signal strength in the imaging space. Phase changes also occur depending on the distance and direction. In this paper, a new approach to decrease the effect of a transmitter's radiation pattern in acoustic imaging is proposed. We compensated for the transmitter's radiation pattern and reconstructed acoustic images using the Synthetic Transmit Aperture imaging technique. The compensation was based on the radiation pattern obtained from real measurements and using a Wiener filter. The purpose of the work was to compensate for a nonideal radiation pattern of the ultrasonic transmitter for both phase and amplitude aspects. An airborne imaging experiment was conducted using a two-dimensional (2D) receiver array and a 2D transmitter array to verify the effectiveness of our proposed method. The results showed an improvement in the vertical angular resolution of reconstructed three-dimensional images.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"2 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":"126718900","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}

{"title":"Detection of pedestrians at night time using learning-based method and head validation","authors":"Qiong Liu, Jiajun Zhuang, Shufeng Kong","doi":"10.1109/IST.2012.6295596","DOIUrl":"https://doi.org/10.1109/IST.2012.6295596","url":null,"abstract":"To improve automotive active safety and guarantee the safety of pedestrians at night time, a fast pedestrian detection method based on monocular far-infrared camera for driver assistance systems is proposed. According to the distribution of gray-level intensity of pedestrian samples, an adaptive local dual threshold segmentation algorithm is executed first to extract candidate regions. The presented pedestrian detector uses histograms of oriented gradients (HOG) as features and support vector machine (SVM) as classifier. In order to speed up the classification phase, the resulting support vectors (SVs) obtained by SVM is optimized to reduce the number of SVs used for decision. A further validation p hase is then introduced to filter the false alarms according to the distribution of gray-level intensity of pedestrians' heads. Experimental results show that the proposed method performs as fast as 34 frames per second on average and guarantees a real-time pedestrian detection; the whole system produces a detection rate of 84.83% at the cost of less than 4% false alarm rate on suburban scenes while produces a detection rate of about 81% at the cost of lower than 10% false alarm rate on urban scenes.","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":"129262576","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}

{"title":"Extraction of pulmonary vessels from MDCT thorax scans","authors":"Anna Fabijańska","doi":"10.1109/IST.2012.6295486","DOIUrl":"https://doi.org/10.1109/IST.2012.6295486","url":null,"abstract":"This paper considers problem of pulmonary vessels identification in MDCT thorax scans. Specifically, the method for vessels segmentation is proposed. The introduced method is 3D region growing approach were growth of the region is guided and constrained by results of random walk segmentation applied to consecutive CT slices. The main steps of the proposed approach are described. Results of vessel segmentation from exemplary MDCT datasets provided by the introduced method are presented and discussed.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"19 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":"131627521","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}

{"title":"Trainingless fingerprinting-based indoor positioning algorithms with Smartphones using electromagnetic propagation models","authors":"I. Bisio, F. Lavagetto, Mario Marchese, M. Pastorino, A. Randazzo","doi":"10.1109/IST.2012.6295537","DOIUrl":"https://doi.org/10.1109/IST.2012.6295537","url":null,"abstract":"Recent multimedia and location-based services (LBSs) employ information about location, orientation, and context of a mobile device. Moreover, the wide spread adoption of Smartphones, usually equipped with powerful processors, accelerometers, compasses, and Global and Hybrid Positioning Systems (GPS/HPSs) receivers, has favored the increasing of location- and context-based services over the last years. In this work a Wi-Fi fingerprint-based indoor positioning techniques is considered. It is aimed at supporting possible location aware services. The main novelty introduced in this paper concerns the training phase, which is usually needed by these techniques. In our approach, the training phase is avoided, since opportune simulative propagation models of the environment in which the algorithm are working are introduced. The resulting technique allows exploiting the accuracy of the fingerprinting approaches and, simultaneously, avoids the heavy training phase, which represents one of the main drawbacks of such techniques.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"20 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":"131669582","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}

{"title":"Dual-modality data acquisition system based on CPCI industrial computer","authors":"Cong Xu, F. Dong, Zhiqiang Zhang","doi":"10.1109/IST.2012.6295525","DOIUrl":"https://doi.org/10.1109/IST.2012.6295525","url":null,"abstract":"As a non-radiant and unperturbed 2D/3D boundary measurement technique, Electrical resistance tomography (ERT) provides an effective way of monitoring and on-line measurements for multi-phase fluid. However, the spatial resolution and accuracy are very poor due to the ill-posed nature of inverse problems. A combination of electrical and ultrasonic dual-modality system based on CPCI industrial computer was developed for increasing the resolution and accuracy. The fusion system was with strong expansibility and high stability due to the CPCI bus and adoption of FPGA. The system has been tested and verified with good SNR and consistence. Preliminary static experiments have been conducted, and this system is an appealing way to improve spatial resolution and accuracy.","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":"125214093","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}

{"title":"Imaging techniques for positioning training in radiography","authors":"T. Maruyama, H. Yamamoto","doi":"10.1109/IST.2012.6295516","DOIUrl":"https://doi.org/10.1109/IST.2012.6295516","url":null,"abstract":"The positioning skill of the radiological technologist is essential for obtaining accurate diagnostic information of an organ and for reducing X-ray exposure in radiography. We previously reported on the development of a computed tomography (CT) image-based training tool. A three-dimensional phantom was produced by using computer graphics. Positioning was performed on a PC, and the plane image corresponding to the performed positioning was produced and displayed. In this study, the algorithm which produces the plane image from the CT image data was improved in order to obtain an image quality comparable to the X-ray image obtained by the Computed radiography (CR) system. The CT value and linear attenuation coefficient were calculated from the CT image data based on the fundamental interactions between X-rays and an object. By using the linear attenuation coefficient, a plane image with the same image quality as the CR image could be produced.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"10 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":"126748133","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}

{"title":"Numerical modeling of magnetic field for magnetic particle imaging","authors":"W. Smolik, P. Wróblewski, J. Szyszko","doi":"10.1109/IST.2012.6295571","DOIUrl":"https://doi.org/10.1109/IST.2012.6295571","url":null,"abstract":"The paper presents the magnetic field modeling for magnetic particle imaging (MPI). The custom static magnetic field solver which enables fast calculation of three dimensional magnetic field distribution was elaborated. The regular square grid is applied in this solver. A setup of coils for MPI was designed. The selection field and the drive fields are generated by three pairs of coils. The magnetic field was calculated using the elaborated custom solver and using the COMSOL commercial FEM software. The comparison of results is presented. The elaborated solver can be used in numerical simulation of spatial encoding methods for magnetic particle imaging.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"255 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":"129508731","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}

{"title":"Electrical Capacitance Tomography (ECT) and gamma radiation meter for comparison with and validation and tuning of CFD modeling of multiphase flow","authors":"C. Pradeep, R. Yan, S. Vestøl, M. Melaaen, S. Mylvaganam","doi":"10.1109/IST.2012.6295569","DOIUrl":"https://doi.org/10.1109/IST.2012.6295569","url":null,"abstract":"Electrical Capacitance Tomographic (ECT) approach is increasingly seen as attractive for measurement and control applications in the process industries. Recently, there is an increased interest in using the tomographic details from ECT for comparing with and validating and tuning CFD models of multiphase flow. Collaboration with researchers working in the field of CFD modeling of multiphase flows give valuable information for both groups of researchers in the field of ECT and CFD. By studying the ECT tomograms of multiphase flows under carefully monitored inflow conditions of the different media and by obtaining the capacitance values, C(i,j,t) with i=1...N, j=1,2,...N and i ≠ j obtained from ECT modules with N electrodes, it is shown in this paper how the interface heights in a pipe with stratified flow of oil and air can be fruitfully compared to the values of these obtained from ECT and gamma radiation meter (GRM) for improving CFD modeling. Monitored inflow conditions in the present study are flow rates of air, water and oil into a pipe which can be positioned at varying inclinations to the horizontal, thus emulating the pipelines laid in sub-sea installations. It is found that ECT based tomograms show most of the features seen in the GRM based visualizations with nearly one-to-one correspondence to interface heights obtained from these two methods, albeit some anomalies at the pipe wall. However, there are some interesting features the ECT manages to capture, features which the GRM or the CFD modeling apparently do not show possibly due to parameters not defined in the inputs to the CFD model or much slower response of the GRM. Results presented in this paper, indicate that a combination of ECT and GRM and preferably other sensor modalities with enhanced data fusion and analysis combined with CFD modeling can help to improve the modeling, measurement and control of multiphase flow in the oil and gas industries and in the process industries in general.","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":"129614219","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}

{"title":"Interface imaging in multiphase flow based on frame by frame eigenvalues of capacitance matrices from Electrical Capacitance Tomographic systems","authors":"R. Yan, C. Pradeep, J. Muwanga, S. Mylvaganam","doi":"10.1109/IST.2012.6295567","DOIUrl":"https://doi.org/10.1109/IST.2012.6295567","url":null,"abstract":"Electrical Capacitance Tomographic (ECT) approach is a viable solution to measurement and control applications in the process industries, especially in the oil and gas industries, as systems certified for usage in explosive environments are available in the market today. In the process industries, there is often a need to identify certain parameters of interest in multiphase flow studies, depending on the relevant parameters to be control. There are a plethora of parameters such as interface levels, volumetric fractions of the different fluids, flow regimes, bubble size and velocity etc. Mathematical studies of the capacitance matrices for each frame obtained from ECT systems have shown that the eigenvalues of these have clear and vivid association with some of the flow related parameters. By studying the eigenvalues of these matrices for ECT based capacitance measurements C(i, j, t) with i=1 ... N, j= 1,2, ... N and i ≠ j obtained from ECT modules with N electrodes, some simple relationships are found between eigenvalues and interface levels for each frame for multiphase flows under carefully monitored inflow conditions of the different media. Monitored inflow conditions in the present study are flow rates of air, water and oil into a pipe which can be positioned at varying inclinations to the horizontal, similar to the subsea pipelines used in the oil and gas industries. Results presented in this paper, indicate that useful information on multiphase flow related parameters can be extracted from capacitance measurements thus rendering an imaging of the process with focus on certain features of interest to the process engineer.","PeriodicalId":213330,"journal":{"name":"2012 IEEE International Conference on Imaging Systems and Techniques Proceedings","volume":"113 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":"123559163","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}