Method for detecting the width and position of documents using image information in a large-format scanner system
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United States of America Patent
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Apr 14, 2015
Grant Date -
Mar 6, 2014
app pub date -
May 5, 2012
filing date -
May 16, 2011
priority date (Note) -
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Abstract
Documents in a large-format scanning system are scanned by coarsely recognizing longitudinal or transverse transition regions between a reflector roller and a document by the substeps of dividing the scanning image transversely into uniform image strips, determining statistical parameters for each image strip, examining the scanning image in the image strips with fixed threshold values for deviations such that, if a value of one the statistical parameters of an image strip exceeds the threshold value, this region is recognized as being a transverse transition region between the reflector roller and the document, and examining the image strips to determine the longitudinal transition region by line-by-line generation of an average value and determining sufficiently strong and steep edges, the image strips being rotated incrementally from the transverse of the document to an acute angle. Then longitudinal or transverse document edges within the transition regions detected by coarse recognition are finely recognized.
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