Patent ID: 6229629
Filing Date: 2001-05-08
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; anda scanning platform for placing thereon said document, having thereon:a first pattern mark located between said home position and said scan start point, coordinates of a first reference point and a second reference point within said first pattern mark being 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 correlating with a shift from said pre-scan position to a specified point of said first pattern mark along said specific direction through a first mathematical function,wherein a scan start point of said photo-signal processing device for picking up said image of said scanned document is determined by said coordinates of said first and said second reference points, said first mathematical function, and a predetermined shift from said specified point to said scan start point along said specific direction.