Patent ID: 8243047

Claim:
A calibrating method for an image processing apparatus, the image processing apparatus comprising a panel and at least one light sensor, a first indicating point, a second indicating point, and a plurality of reference points, whose coordinates are known, being displayed on the panel, the light sensor being located at a predetermined position near a specific point on the circumference of the panel, the calibrating method comprising the steps of: (a) determining a third indicating point and a fourth indicating point on the panel according to a first indicating point, a second indicating point, and the specific point; (b) determining the predetermined position according to a first line which passes through the first indicating point and third indicating point and a second line which passes through the second indicating point and fourth indicating point; (c) generating a base line which passes through the predetermined position and is parallel to the circumference of the panel; (d) forming a plurality of reference lines according to the reference points and the predetermined position, and forming a plurality of reference angles according to the reference lines and the base line; (e) generating a plurality of reference point coordinates which respectively corresponds to the reference points in an image of the at least one light sensor; and (f) generating a calibration function according to the reference point coordinates and the reference angles.