Multiple channel scanning device using oversampling and image processing to increase throughput
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United States of America Patent
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Jan 22, 2002
Grant Date -
N/A
app pub date -
Jun 2, 1998
filing date -
Jun 2, 1998
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Abstract
A multiple channel scanning device has a scanning head with multiple columns of apertures that emit light which is projected to a small spot on the surface of a recorded medium. Light returned from the medium reenters the apertures and is conducted to detectors. In a preferred embodiment, the scanning head is rapidly oscillated (may be on the order of 100 kHz rate), in a direction parallel to the columns. The medium is moved in a direction perpendicular to the columns so that the same recorded regions pass beneath successive columns of apertures. The data from the detectors is image-processed to improve the quality of data reading using the successive readings of the same data regions. This allows errors to be corrected and throughput to be improved.
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