Patent ID: 7729544

Claim:
A method for adjusting an operation frequency of an optical input device according to a change of a reference frame, the method comprising the following steps: (a) capturing and setting a first image as a reference frame of the optical input device; (b) capturing and setting an image as a sample frame of the optical input device; (c) analyzing the sample frame according to a correlation between the sample frame and the reference frame; (d) when the correlation between the reference frame and the sample frame is less than a critical value, capturing a second image and setting the second image as the reference frame of the optical input device instead of the first image; and (e) adjusting number of images captured per second by the optical input device according to a time interval between setting the first image as the reference frame of the optical input device and setting the second image as the reference frame of the optical input device; wherein the optical input device comprises an image capturing unit; wherein step (a) and step (b) utilize the image capturing unit to capture images, and step (e) comprises adjusting a capturing frequency of the image capturing unit according to the time interval between setting the first image as the reference frame of the optical input device and setting the second image as the reference frame of the optical input device.