Patent ID: 8928626
Filing Date: 2015-01-06
Classification: G06F

Abstract:
1. An optical navigation system comprising: a light source configured to emit light; a sensor configured to capture a light-on frame and a light-off frame; wherein both frames are captured at a shutter value; an object detection engine coupled to the sensor, the object detection engine configured to determine a first set number for photosensitive pixel elements used in acquiring the light-on frame and a second set number for photosensitive pixel elements used in acquiring the light-off frame, the object detection engine is configured to report a motion data by comparing a scaled-up pixel value with a threshold value; and a calculator of the object detection engine configured to calculate the scaled-up pixel value, wherein the calculator is configured to determine a pixel difference between the first set number and the second set number to determine a ratio of the pixel difference to the shutter value, and to multiply the ratio with a multiplying factor.