A flatbed scanner comprises: a platen for supporting a substrate and a carriage for traversing across a surface. The carriage comprises a pagewidth scanhead for scanning a pre-printed graphic image and a pagewidth printhead for printing a position-coding pattern onto the surface. The flatbed scanner...http://www.google.com/patents/US8139261?utm_source=gb-gplus-sharePatent US8139261 - Interactive flatbed scanner
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