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Imaging Systems and Techniques, 2009. IST '09. IEEE International Workshop on

Date 11-12 May 2009

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Displaying Results 1 - 25 of 97
  • [Front cover]

    Publication Year: 2009 , Page(s): c1
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    Freely Available from IEEE
  • [Copyright notice]

    Publication Year: 2009 , Page(s): ii
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    Freely Available from IEEE
  • Table of contents

    Publication Year: 2009 , Page(s): iii - xv
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    Freely Available from IEEE
  • Message from the Chairman

    Publication Year: 2009 , Page(s): xvi
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    Freely Available from IEEE
  • IST 2009 Committee

    Publication Year: 2009 , Page(s): xvii - xviii
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    Freely Available from IEEE
  • Ultra high speed electron beam tomography for flow measurement and small animal imaging

    Publication Year: 2009 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1179 KB) |  | HTML iconHTML  

    We introduce ultra high speed electron beam tomography as a new imaging tool for multiphase flow measurement and small animal imaging. The technique is based on imaging with X-rays produced by a rapidly scanned electron beam instead of a mechanically rotating source-detector compound. The scanner device ROFEX was developed manufactured and commissioned recently at FZD and allows scanning of objects with up to 7.000 frames per second speed and 1 mm spatial resolution. Application examples from multiphase flow measurement and small animal imaging are presented. Multiphase flow imaging mainly benefits from fast scanning which is impossible with any other imaging technology at this temporal and spatial resolution. Small animal imaging with ultra fast electron beam CT, however, is still in its beginning. Here higher spatial resolution and 3D imaging is needed. View full abstract»

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  • A CMOS image sensor for monochromatic spectrum imaging

    Publication Year: 2009 , Page(s): 6 - 10
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2824 KB) |  | HTML iconHTML  

    A CMOS image sensor based on standard CMOS process which can image the monochromatic spectrum image was developed. It took the advantage of the penetration depth differences of monochromatic light in silicon. Through the usage of double junctions photodiode which can sense short wavelength and long wavelength illumination simultaneously, we got the final device response which increase monotonically with the wavelength, and the wavelength can be known through this monotonicity. First we introduced the basic principle of the device, then ideas in pixel design and array readout circuitry were given, finally we measured the manufactured device, the QEs of the device and the monotonic relationship between the device and the wavelength of the monochromatic spectrum were given. View full abstract»

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  • Charged particle imaging using CMOS Active Pixel Sensors

    Publication Year: 2009 , Page(s): 11 - 16
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2191 KB) |  | HTML iconHTML  

    CMOS Active Pixel Sensors for charged particle imaging are studied. Using same architecture, two prototypes were developed on AMS 0.35 mum OPTO process with different thickness of epitaxial layer. Both have a 32 times 128 pixels array where 24 columns have discriminated binary outputs and 8 columns have test analog outputs. Thanks to the correlated double sampling structure realized in pixel level, noise is well controlled. The temporal noise is around 11 electrons and the fixed pattern noise is below 3 electrons. Charged particle detection performances are evaluated by using a 55Fe radioactive source and measurements are reported. One bit binary output is realized by an auto-zero discriminator which is implemented at the end of each column. The power dissipation of each column is 430 muW (pixel and discriminator). View full abstract»

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  • Dynamic sensing in mimicking cutaneous mechanoreceptors - 3D sensor applying reception by vision

    Publication Year: 2009 , Page(s): 17 - 21
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1781 KB) |  | HTML iconHTML  

    A tactile sensor (3times3 array of spring loaded probes) applying mechano-reception by vision was developed. The sensor is novel in its application of a miniature CMOS VGA camera to measure the change in apparent size of miniature pin heads which is directly related to depth discrimination. It has a depth resolution of 50 mum. View full abstract»

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  • Design and analysis of 8mm radiometer used for passive millimeter-wave image system

    Publication Year: 2009 , Page(s): 22 - 25
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (465 KB) |  | HTML iconHTML  

    Millimeter-wave imaging system is developing very quickly in airport security and aircraft navigation. Radiometer plays a key role in the millimeter-wave imaging system. The characteristic of full power radiometer and Dicke radiometer is compared. The key parts for a new direct-detection radiometer is designed and analyzed. The chips for LNA, detector and integrator are chosen and simulated, which will meet the needs of the radiometer. The work can provide a good reference for the design of the radiometer for millimeter-wave imaging system. View full abstract»

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  • An imaging system with planar PCB-coil sensor array

    Publication Year: 2009 , Page(s): 26 - 31
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1904 KB) |  | HTML iconHTML  

    To detect hidden metallic objects, an imaging system with a planar PCB-coil sensor array has been developed. The sensor array consists of a driving board and a pickup board, with square spiral coil elements connected in series. Fast scan can be achieved by row-excitation and column-detection. Mutual inductance between the driving-pickup coil pairs is measured by an HP4192-based multi-channel measurement system. Using sensitivity coefficients, an image presenting conductivity/ permeability distribution can be obtained by interpolation and pixel-averaging from the normalised measurements. Initial tests show that the system can image both conductive and magnetic objects with an imaging depth of 10 mm and a spatial resolution of one coil element. The issues with cross-talk and image errors due to object covering multiple sensing elements should be compensated to improve image fidelity. View full abstract»

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  • A fast three-dimensional image reconstruction method for ERT

    Publication Year: 2009 , Page(s): 32 - 36
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (526 KB) |  | HTML iconHTML  

    Electrical resistance tomography (ERT) aims to estimate the electrical properties at the interior of an object from current-voltage measurements on its boundary. Although two-dimensional model is commonly used in most research, it cannot satisfy practical needs. In this paper, three different electrode structures in three-dimension (3D) were proposed and compared. An advanced version of the conjugate gradient (CG) method, i.e. the Schur CG method, is used to solve the inverse problem for 3D ERT. The solution space is divided into two subspaces. The main part of the solution lies in the coarse subspace, which can be calculated directly and its corresponding correction term with a small norm can be solved in the Schur complement subspace. In order to improve the disadvantage of ill-posed for EIT problem, we also investigate three different multilayer electrode structures for 3D models. Experimental results obtained by the Schur CG algorithm are also presented, indicating that the Schur CG algorithm can improve the quality of reconstructed image and real time performance. View full abstract»

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  • New progress of the digital electrical capacitance tomography system for gas/liquid two phase flow

    Publication Year: 2009 , Page(s): 37 - 40
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (577 KB) |  | HTML iconHTML  

    Electrical capacitance tomography (ECT) is gaining acceptance as a laboratory and industry tool to analyze gas/liquid two phase flow. To overcome the shortcomings of the existing analogue ECT system, a new 16-electrode digital electrical capacitance tomography system based on FPGA and DSP is designed. The new scheme can easily realize single frequency and multi-frequency excitation and demodulation. Furthermore, two kinds of methods for multi-frequency demodulation, DFT demodulation and digital quadrature demodulation, are discussed deeply. Static and dynamic experiments under condition of single frequency are carried out to verify the performance of the digital ECT system. Experimental results show that this system is of high precision and stability. View full abstract»

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  • Electrical Capacitance Tomography in dense-phase pneumatic conveying of pulverized coal under high pressure

    Publication Year: 2009 , Page(s): 41 - 46
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1202 KB) |  | HTML iconHTML  

    The electrical capacitance tomography (ECT) system is applied to identify the flow regime of gas-solid flows in horizontal pipeline with 10 mm inner-diameter in a pulverized coal dense-phase pneumatic conveying experimental setup at the pressure up to 4.0 MPa and the solid-gas ratio up to 11.73 kg/kg. 8-electrode thick-pipeline and small-diameter ECT sensor applied in high pressure is fabricated, and the pipeline thickness is 5 mm. For the purpose of analyzing the effect of pipeline thickness on ECT sensor, radius-electrode ratio is defined as the ratio of inner and outer radius of pipeline. The rules of 8-electrode sensor parameters such as capacitance, capacitance change, and change rate of capacitance and sensitivity map are discussed by ANSYS and Matlab, which are combined to simulate sensor characteristic. With the increase of radius-electrode ratio, the effect of pipeline thickness on capacitances of four typical inter-electrode pairs is much different. LBP algorithm is adopted to reconstruct the images of stratified flow, core flow and annular flow with different radius-electrode ratios. Simulation results show that image error under high radius-electrode ratio is small, and the image reconstructed from stratified flow is better than the ones from core flow and annular flow. Finally, the experimental result of 8-electrode ECT with thick pipeline sensor, which is used on the pulverized coal dense-phase pneumatic conveying experimental setup, is given. View full abstract»

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  • 2D ECT with square sensor using Calderon's method

    Publication Year: 2009 , Page(s): 47 - 51
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (594 KB) |  | HTML iconHTML  

    Calderon's method was introduced to electrical capacitance tomography with square sensor in this paper. It is a direct algorithm of the image reconstruction, as no matrix inversion or iterative process is needed. It was implemented through numerical integration. Since the Gauss-Legendre quadrature was applied and can be predetermined, the image reconstruction process was fast and resulted in images of good quality. Simulated results validated the feasibility and effectiveness of Calderon's method in electrical capacitance tomography with square sensor. View full abstract»

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  • Elimination of gridlines by using non linear filter in mammograhic image

    Publication Year: 2009 , Page(s): 52 - 57
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (934 KB) |  | HTML iconHTML  

    The mammographic X-ray equipment uses a radiographic grid in order to remove the scatter radiation and improve image contrast. The grid causes striped lines to appear on the film and may degrade diagnostic information. In this study, we propose a new method which reduces the noise caused by the grid on mammographic film using non linear image filtering. We performed median filtering and the V-filtering as a method of image filtering. We consider the region of the filters to eliminate gridlines effectively. In the experiment using the breast phantom, we calculated signal to noise (SN) ratios in the micro calcifications region. The SN ratio of the image processed by median filtering after the V-filtering was increased. Furthermore, we evaluated the noise by using the power spectrum in a line profile by fast Fourier transform. The value of the power spectrum at a frequency that represented the periodic noise made by the gridlines was decreased. We could confirm the validity of image filtering. It was found out that our proposed image filtering method was useful for eliminating gridlines in the X-ray image. View full abstract»

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  • Dealing with peaks overlapping issue in quantifying metabolites in MRSI

    Publication Year: 2009 , Page(s): 58 - 62
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (606 KB) |  | HTML iconHTML  

    A novel methodology deals with the peaks overlapping issue in quantifying metabolites in MRSI is proposed in this paper. The introduced method encounters the metabolites quantification procedure as a typical optimization problem able to be solved by using optimization methods of the computational intelligence. A simple genetic algorithm is applied in order to find the metabolites peaks parameters that best match the spectrum in process. This novel approach comes to overcome the disadvantages of the neural networks, used for the same purpose, where the overlapping issue is handled difficultly. The experimental results are very promising showing that highly overlapped metabolites peaks can quantified accurately, by using the proposed method and place the basis for further investigation. View full abstract»

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  • Molecular imaging of tissue with high-contrast multispectral photosensitizing polarimetric imaging techniques

    Publication Year: 2009 , Page(s): 63 - 66
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (455 KB) |  | HTML iconHTML  

    Backscattered laser beam contributions from biological fluids doped with optically active molecules were measured utilizing single-detection autobalanced polarimetric detection principles. The outcome of this study indicates that both the Detective Quantum Efficiency (DQE) and the Degree of Linear polarization (DOLP) of backscattered optical signals increase with increasing the concentrations of molecular optically active dopants. This translates to enhanced signal-to-noise ratio and contrast. View full abstract»

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  • Reducing Motion Estimation Time with Skin Detection

    Publication Year: 2009 , Page(s): 67 - 70
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (451 KB) |  | HTML iconHTML  

    Motion estimation (ME) is one of the key parts of video compression algorithms. But, motion estimation and computation of motion vectors (MVs) are very time consuming. In this paper, we propose a method for reducing the cost of motion estimation process. During this process, a series of candidate blocks should be searched to find the best motion vectors. In our method, we compare the skin parts of two blocks before comparing all pixel pairs of the two blocks. Having a preprocessing phase, the skin part comparison is performed quickly. This method provides a parameter that can be used to create a balance between the processing time and the motion estimation accuracy. View full abstract»

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  • Multi-kernel SVM based classification for tumor segmentation by fusion of MRI images

    Publication Year: 2009 , Page(s): 71 - 75
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (984 KB) |  | HTML iconHTML  

    Tumor segmentation, a significant application in the field of medical imaging and pattern recognition, is still a very difficult and unsolved problem up to now. In this paper, an improved SVM algorithm-multi-kernel SVM, integrated with data fusion process, is proposed to segment the tumors from the MRI image sequence. Three kinds of MRI image sequence-T2, PD, FLAIR are used as input sources in learning and classifying process. Then a region growing step is exploited for a refinement of the tumor contour. At last, according to the follow-up result of the same patient at five different periods, it is obvious that the tumor's volume becomes smaller, and an evaluation percentage is given to prove the effectiveness of the therapy. The quantification of result demonstrates the effectiveness of the proposed method. View full abstract»

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  • Mitigation of atmospheric contrast degradation via image enhancement

    Publication Year: 2009 , Page(s): 76 - 79
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (779 KB) |  | HTML iconHTML  

    Images obtained in bad weather such as haze, fog may have low contrast, particularly towards the top of the image. The technical challenge is to reverse this process - provided with just the ldquofoggyrdquo scene, estimate the contribution due to optical scattering and so recover the original scene. This is possible for a general flat-field scene and a forward-looking camera, although there are some limitations due to noise effects. View full abstract»

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  • Accurate and fast iris segmentation applied to portable image capture device

    Publication Year: 2009 , Page(s): 80 - 84
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1296 KB) |  | HTML iconHTML  

    As an important step for iris recognition, iris segmentation provides available texture region for subsequent processing. When using portable image capture device, non-ideal iris images are often obtained. Hence, this paper presents a novel algorithm for accurate and fast iris segmentation. By combining level set theory with variational method, probabilistic active contour model (PAC) is established. In addition, region information and probability distribution are used as stop terms. Under this model, initial curve is iteratively driven towards iris boundaries. In the evolving process, eyelids, eyelashes, reflections and shadows are simultaneously detected. Experimental results on iris image database demonstrate that the proposed algorithm outperforms state-of-the-art methods in both accuracy and speed. View full abstract»

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  • Infrared face recognition based on blood perfusion and fisher linear discrimination analysis

    Publication Year: 2009 , Page(s): 85 - 88
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (541 KB) |  | HTML iconHTML  

    To get the good performance of infrared face recognition from the biological feature and statistical character, a novel method for infrared face recognition based on blood perfusion and fisher linear optimal discrimination is proposed in this paper. Firstly, thermal images are converted into blood perfusion domain by blood perfusion model to enlarge between-class distance and lessen within-class distance, which makes full use of the biological feature of the human face. Then, the FLD is chosen to maximize the ratio of between-class distance to within-class distance from the statistical scope. The experiments illustrate that transformation from thermal images to blood perfusion domain can enlarge the ratio of between-class distance to within-class distance and the method proposed in this paper has better performance compared with traditional methods. View full abstract»

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  • Haar-like features based eye detection algorithm and its implementation on TI TMS320DM6446 platform

    Publication Year: 2009 , Page(s): 89 - 93
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (386 KB) |  | HTML iconHTML  

    A haar-like features based eye detection algorithm is introduced and implemented on TI TMS320DM6446 platform in this paper. With fast searching speed and high detection rate, the algorithm is packed into codec and put on the DSP-side for remote call. Application on the ARM-side captures face images from camera and outputs detection results to computer monitor. Experimental results demonstrated that the implemented eye detection system on DM6446 can search and locate eyes effectively with little chip resources required. View full abstract»

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  • 3D object shape and reflectance property reconstruction using image scanner

    Publication Year: 2009 , Page(s): 94 - 99
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (795 KB) |  | HTML iconHTML  

    This study proposes a method to recover 3D shape, color and specular reflections of an object from images taken by an image scanner which has multiple illuminations. The proposed method is constructed by two processes. First is the initial shape estimation and second is the iterative process to estimate the object shape, color and specular components. In this paper, we propose two methods for the initial shape estimation: one is the use of multiple light sources along circular paths and the other is the use of two groups of two light sources located in same direction. From the experimental results using synthetic images, multiple light sources can be estimate object shape, color and specular reflections correctly. But, because of many light sources, the structure of the image scanner will be complex. On the other hand, in case of two groups of two light sources, estimated object color and specular components has some errors but the object shape can be estimated accurately. View full abstract»

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