Television – Special applications – Object or scene measurement
Patent
1996-07-19
1997-05-06
Garber, Wendy
Television
Special applications
Object or scene measurement
348 61, 348 94, 348135, 358479, 358452, 358453, 356375, H04N 718, H04N 1387
Patent
active
056275854
ABSTRACT:
An arrangement for high-resolution scanning of large image formats with exact geometrical correspondence is described. It is applied in photogrammetry and in optoelectronic scanners with high requirements regarding exact geometrical correspondence. Metric image contractions of large image formats are obtained without dimension-embodying auxiliary means by employing a CCD matrix which is exactly dimensioned to pixel sensitivity distribution. This CCD matrix is used as an absolute dimensional embodiment, from which only one active pixel area determined as a function of the memory area of the frame grabber is adopted into the frame grabber while ensuring an image contraction which is absolutely synchronous with the pixels. Based on the pixel raster, this active pixel area forms the step width for the high-precision scanning mechanism which is adapted with respect to its accuracy, wherein the active pixel areas of the scanning steps are lined up so as to cover the surface without gaps and substantially without overlaps. Dimension-embodying auxiliary means, e.g. network grids, can accordingly be dispensed with without any impairment of accuracy.
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Raynor et al. -The Technology and Practical Problems of Pixel-Synchronous CCD Data Acquisition for Optical Metrology Applications--Sep. 1990--SPIE vol. 1395--pp. 96-103.
Borchardt Werner
Goldschmidt Ralf
Christensen Andrew B.
Garber Wendy
Rheinmetall Jenoptik Optical Metrology GmbH
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