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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...
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...
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,...
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.
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...
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...
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...
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...
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,...
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...
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...
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...
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...
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...
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...
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