There is described a method as well as a device for motion detect ion in an optical sensing device, such as an optical mouse. A photodetector array comprising a plurality of pixels is used to detect successive light intensity patterns of an illuminated portion of a surface with respect to which a measurement...http://www.google.ca/patents/US7122781?utm_source=gb-gplus-sharePatent US7122781 - Method and sensing device for motion detection in an optical pointing device, such as an optical mouse
