Method for optically identifying coordinate information and system using the method

An optical coordinate information identifying system comprising:

• an object with plural sheets to be identified, wherein reference indications are formed near at least one margin of each sheet for page number identifying;
• an optical device formed by a hollow body with two ends, where an image capture element is mounted at one end while the other end is used as an index point;
• an image processing circuit and a coordinate calculation circuit are retained inside the hollow body;
• when the index point moves to a selected position, the coordinate calculation circuit calculates coordinate information of the selected position;
• and
• a data output unit mounted inside the hollow body to output an accessory data corresponding to the selected position.

A method for optically identifying coordinate information on a 3-D object, comprising the acts of:

• forming reference indications on a surface of the object to be identified;
• using an optical device to point to a selected position on the object, and to detecting the reference indications so as to generate reference coordinate information;
• and
• calculating actual coordinate information of the selected position based on the reference coordinate information and position data of the optical device itself.