Results 241 to 250 of about 12,346,737 (289)
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A Multiple-Gate CCD-Photodiode Sensor Element for Imaging Arrays
IEEE Journal of Solid-State Circuits, 1978The addition of barrier and storage gates between the photodiodes and transfer gates of a CCD imaging array provides improved and versatile operating characteristics compared with present silicon scanners. An experimental scanner, made with multiple-gate photoelements, has new functional capabilities which result from the on-chip structure.
J.M. White, S.G. Chamberlain
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High frame rate imaging with a small number of array elements
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 1999Recently, a high frame rate imaging method has been developed to construct either 2-D or 3-D images (about 3750 frames or volumes/s at a depth of about 200 mm in biological soft tissues because only one transmission is needed). The signal-to-noise ratio (SNR) is high using this method because all array elements are used in transmission and the transmit
J Y, Lu, S, He
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64 Elements two-dimensional piezoelectric array for 3D imaging
Ultrasonics, 2002Ultrasound has a large potential on non-invasive inspection with main applications in medical imaging and non-destructive testing (NDT). The increasing interest in 3D imaging applications leads to investigate new solutions for two-dimensional (2D) ultrasonic arrays with an affordable number of electronic channels without resolution degradation.
M, Akhnak +3 more
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Color image encryption using a high-quality elemental image array
Optics Communications, 2014Abstract In this paper, we present a color image encoding algorithm by combined use of the high-quality elemental image array (EIA) and the pseudo-random mask. To overcome low resolution drawbacks in widely used optical pickup system, in our scheme, the pseudo-inverse filter is introduced to improve this problem.
Xiao-Wei Li, Seok-Tae Kim, In-Kwon Lee
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Method of generating orthoscopic elemental image array from sparse camera array
Chinese Optics Letters, 2012We propose a method of generating orthoscopic elemental image array from a sparse camera array. A parallax image array obtained by a sparse camera array provides different perspectives of a real threedimensional (3D) scene, and has all the information the elemental image array needs.
Huan Deng Huan Deng +2 more
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Optimization of the Array Element Layout for a Rotating Imaging Interferometer
IEEE Transactions on Antennas and Propagation, 2013In this paper, after a brief review on the working principles of synthetic aperture radiometers exploiting interferometry and mechanical rotation of the antenna, analytical expressions are provided which allow to easily compute the receiving performance of the interferometer starting from given locations of its sensors.
Tommaso Isernia +5 more
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Imaging with large-aperture arrays with heterogeneous directive elements
IEEE Symposium on Ultrasonics, 2003, 2004We have developed a new imaging algorithm for optimization of the contrast resolution of large-aperture arrays utilizing directive elements with heterogeneous responses. The algorithm employs depth-dependant pre- and post-beamforming filtering to optimize the SNR of the echo data throughout the imaging field. Sub-aperture processing is also employed to
null Hui Yao, E.S. Ebbini
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Using co-prime arrays to reduce the number of array elements in ultrasonic imaging
Proceedings of Meetings on AcousticsReducing the number of array elements in ultrasonic imaging is crucial for lowering system cost and improving scalability. This study introduces a co-prime array configuration to achieve high-resolution imaging with fewer elements. A co-prime array synthesizes a beam pattern equivalent to that of an array with N×M elements by multiplying the beam ...
Satoshi Nakayama, Norio Tagawa
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Imaging with a 16 000-element 2-D array
The Journal of the Acoustical Society of America, 1999Imaging with acoustical lenses in the low MHz frequency range using fully populated 2-D arrays offers the potential for high-resolution, real-time, 3D volume imaging, together with low power and low cost. A 2-D composite-piezoelectric receiver array bonded directly to a large custom-integrated circuit is the enabling technology for a new implementation
Ken Erikson, Tim White
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A 15 element imaging binary array for 100 GHz
IEEE International Digest on Microwave Symposium, 2002A focal plane imaging array receiver which covers the 90-115-GHz range for radio astronomical observations is described. The 3*5 array uses cryogenic Schottky diode mixers with integrated HEMT (high-electron mobility transistor) IF amplifiers. A cold, quasioptical filter selects the correct sideband, and terminates the image at 20 K.
N.R. Erickson +4 more
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