Patent ID: 8179369
Filing Date: 2012-05-15
Classification: G06F

Abstract:
1. An optical navigation device comprising: an image input unit for emitting light, receiving light reflected from a working surface to generate an analog image signal for respective pixels, converting the analog image signals into digital image signals, and outputting the digital image signals; a delta image generator for receiving the digital image signals, generating a cumulative average for the digital image signals received for a predetermined period of time with respect to each pixel, and subtracting the cumulative average from the digital image signal in the respective pixels to generate a delta image signal for the respective pixels; and a motion value calculator for calculating a motion value using the delta image signals, wherein the delta image generator comprises: wherein the average operation unit generates a new cumulative average using only edge elements of the digital image signal and the cumulative average that are arranged in an m×n matrix.