Patent ID: 6937369

Claim:
A method for positioning a scanning starting point of an image scanning apparatus, wherein the image scanning apparatus comprises a platen having an orthogonal X-Y coordinate system and for a document to be scanned being placed thereon, and a carriage disposed in the image scanning apparatus and moving along a Y direction for capturing an image of the document to be scanned, the orthogonal X-Y coordinate system having an X-axis being defined by a wide margin of the platen and a Y-axis being defined by a first long margin of the platen, the method comprising the following steps: (a) choosing one of a plurality of marks inside the image scanning apparatus as a reference point, wherein the chosen mark is located nearest to the image of the document to be scanned; (b) obtaining a vector from an image starting point of the document to be scanned to the reference point; (c) moving the carriage to the reference point; and (d) moving the carriage from the reference point to the image starting point according to the vector, and proceeding to scan.