Detection of scanning velocity or position

Full Title

Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof > Scanning arrangements > Detection, control or error compensation of scanning velocity or position > Detection of scanning velocity or position

Child Classifications

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• H04N 2201/04703 using the scanning elements as detectors, e.g. by performing a prescan
• H04N 2201/0471 using dedicated detectors
• H04N 2201/04715 by detecting marks or the like, e.g. slits
• H04N 2201/04729 in the main-scan direction
• H04N 2201/04731 in the sub-scan direction
• H04N 2201/04732 Detecting at infrequent intervals, e.g. once or twice per line for main-scan control
• H04N 2201/04734 Detecting at frequent intervals, e.g. once per line for sub-scan control
• H04N 2201/04737 by detecting the scanned medium directly, e.g. a leading edge
• H04N 2201/04739 by detecting the scanning head or scanning carriage
• H04N 2201/04741 by detecting the sheet support or the photoconductive surface directly
• H04N 2201/04743 by detecting the image directly
• H04N 2201/04744 by detecting the scanned beam or a reference beam
• H04N 2201/04748 by detecting synchronisation signals or driving signals, e.g. page sync
• H04N 2201/04749 Detecting position relative to a gradient, e.g. using triangular-shaped masks, marks or gratings
• H04N 2201/04751 Detecting position relative to a step, e.g. using L-shaped masks, marks or gratings