Results 271 to 280 of about 65,854 (286)
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Image Subtraction by the Spatial Filtration Technique
Optica Acta: International Journal of Optics, 1985An image subtraction technique is presented and analysed. It is based on the simultaneous use of three similarly oriented diffraction gratings, two of which are aligned with the images to be subtracted. The third is located in the Fourier plane. The technique is shown to impose less stringent requirements on the alignment of the optical system, the ...
A.A. Lapides, M.E. Zhabotinski
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Improvement of terahertz imaging with a dynamic subtraction technique
Applied Optics, 2000By use of dynamic subtraction it is feasible to adopt phase-sensitive detection with a CCD camera to reduce long-term optical background drift. We report on a two-order improvement of the signal-to-noise ratio. The improved system is used to image terahertz field distribution generated by an optically rectified electro-optic crystal with a modulation ...
X. G. Xu, Xi-Cheng Zhang, Zhiping Jiang
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Intravenous Arteriography Using Digital Subtraction Techniques
JAMA: The Journal of the American Medical Association, 1982The application of digital computers to electronic x-ray imaging devices has rejuvenated interest in the field of intravenous arteriography. By utilizing computer image subtraction techniques, digital roentgenographic systems based on fluoroscopy or computed tomography (scanned projection radiography) provide significantly improved vascular imaging ...
William R. Brody +6 more
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An Efficient Region-Based Background Subtraction Technique
2008 Canadian Conference on Computer and Robot Vision, 2008This paper proposes an efficient region-based background subtraction technique using static camera for motion detection in various monitoring applications. Color histograms, texture information, and successive division of candidate rectangular image regions are utilized to model the background and detect the motion.
Parisa Darvish Zadeh Varcheie +2 more
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Background subtraction techniques in surface analysis
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 1984The data acquired from most surface analysis instrumentation are composed of two parts, (a) peaks of interest, and (b) a background. The background is usually regarded as a hindrance to data processing and various techniques have been developed to eliminate or reduce its effects.
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Subtractive Hybridization Techniques to Study Cellular Senescence
2007Molecular and cellular processes related to the senescence syndrome are determined by programs of differential gene expression. Subtractive cDNA hybridization is a powerful approach to identify and isolate differentially expressed genes in various systems.
Michal Bassani Sternberg +1 more
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Subtraction Technique in Renal Angiography
Journal of Urology, 1966Harry W. Ten Cate +2 more
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Television Subtraction Techniques in Urography
Journal of Urology, 1966James H. DeWeerd, Colin B. Holman
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Subtraction Technique in Encephalography
Investigative Radiology, 1967Marcello Mazzacurati, Giovanni Ruggiero
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A Novel Technique for Spectral Subtraction
Instrumentation Science & Technology, 1974Colin F. Chignell, Ronald H. Erlich
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