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Abstract

A scanning area detection method applies to a shuttle scanner having a position sensor mounted with respect to a paper guide of the shuttle scanner, with the position sensor outputting an electrical signal indicative of the position of the paper guide. The method includes the steps of: adjusting the position of the paper guide according to the width of a document to be scanned; determining a width value of the document to be scanned according to the electrical signal output of the position sensor and storing the detected width value in a memory; and scanning a block by slices while incrementing a slice coefficient, at least until the slice coefficient of the last scanned slice of the block reaches the stored width value. The shuttle scanner processes block slices corresponding to a physical scanning limit of the shuttle scanner minus the determined width value, as extra-document data. If it is determined that the mode of operation of the shuttle scanner is a facsimile mode, the extra-document data is processed as white data. Otherwise, the extra-document data is processed as a null value.

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First Claim