Optical touch calibration automatic adjusting method

The invention discloses an optical touch calibration automatic adjusting method. The method comprises the following units: Camera 1 and Camera 2 signal units, a touch screen unit, an image signal interface, an image effective region extraction unit and an optical sensor calibration unit, wherein the Camera 1 and Camera 2 signal units are CCD Cameras or CMOS Cameras in general for picking up image signals of a touch screen unit; the touch screen unit is used for displaying each image signal and receiving an instruction; the image signal interface is used for receiving touch screen image signals picked up by the Camera; the image effective region extraction unit is used for calculating an illumination impact factor and a self-adaptive adjusting factor from a touch screen image signal acquired by the Camera and transmitted from an image signal interface, finding the start and stop positions of a perceptual image according to impact factor K, and calibrating the region between the start and stop positions of the perceptual image as the image effective region; and the optical sensor calibration unit is used for optical sensor calibration for the extracted image effective region.