Abstract: In view of the current optical touch system frame, it exists the accuracy restrictions of contacts calibration because of the characteristics of the camera image, this paper researches a high performance contacts coordinates calibration form, and put forward a general contacts calibration algorithm, it expands the adaptability to cameras and the installation environment. Through the introduction of image registration method and the extraction of feature point, it realizes the unification of coordinate; by combining with the dynamic search table algorithm, it improves image registration effieiency. Finally, the validity of this method was verified by theoretical and experimental results.

Key words: Contact calibration, Image registration, Feature point, Dynamic search table