Document recognition with forward direction scan for detecting the boundaries of an original document and reverse direction scan for producing recorded image on the original document

摘要

Apparatus is disclosed having document recognition capability for determining the size and location of an original document on a scanner platen before the document is scanned for image capture, and which effects both document recognition and image capture within a single scan cycle. A platen is optically scanned in forward and reverse intrack directions, and an electrical information signal characteristic of the optical densities scanned is created. Document recognition is responsive to the electrical information signal produced during the forward direction scan for detecting the boundaries of an original document on the platen. Image capture is responsive to the electrical information signal produced during the reverse direction scan for producing a record of the image on the original document. Magnification is provided for changing the size of the recorded image from that of the image on the original document in part by adjusting the speed of the reverse intrack scan, and is automatically adjustable in accordance with the size of the recording sheet.