Patent ID: 9235279
Filing Date: 2016-01-12
CPC Classification: G06F,Y02D

Claim Text:
1. A wake up method of an optical input device, the method comprising: a) capturing and setting a first image as a reference frame when the optical input device enters a sleep mode; b) capturing and setting a second image as a compare frame while the optical input device operates in the sleep mode; c) comparing the compare frame and the reference frame to generate a histogram difference; d) determining whether a peak histogram value of the histogram difference is less than a predetermined threshold; and e) causing the optical input device to operate in an active mode when the peak histogram value of the histogram difference is less than the predetermined threshold; wherein step c) further comprises: comparing each pixel value in the compare frame with the corresponding pixel value in the reference frame; computing the histogram difference based on the comparison result; and obtaining the peak histogram value of the histogram difference.