Patent ID: 6392762
Filing Date: 2002-05-21
Classification: H04N

Abstract:
An image scanner, comprising:a photo-signal processing device moving along a specific direction from a home position for picking up an image of a scanned document, and converting said image into digital data to be further processed; and a scanning platform for placing thereon said document, having thereon: a background region located in front of said scan start point along said specific direction, and being of a first color; and a color block located within said background region, being of a second color different from said first color of said background region, and having an interface with said background region; wherein coordinates of a first reference point and a second reference point located in said interface are read when said photo-signal processing device moves to a pre-scan position and performs a pre-scan operation, and said coordinates of said first and said second reference points correlate with a shift from said pre-scan position to a specified point of said color block along said specific direction through a correlating mathematical function, so that a scan start point of said photo-signal processing device for picking up said image of said scanned document is determined according to said coordinates of said first and said second reference points, said correlating mathematical function, and a predetermined shift from said specified point to said scan start point along said specific direction.