Patent ID: 8907264
Filing Date: 2014-12-09
Classification: G06F,G06K

Abstract:
1. An optoelectronics apparatus for use with a single light source that is driven to selectively emit light, the optoelectronics apparatus comprising: first, second, third and fourth electrically isolated photodetector (PD) segments, each of which is configured to detect light originating from the single light source that has reflected off an object and is incident on the PD segment, wherein circuitry configured to produce a first motion signal that is indicative of a sum of the first and second signals minus a sum of the third and fourth signals ((A+B)−(C+D)); circuitry configured to produce a second motion signal that is indicative of a sum of the second and third signals minus a sum of the first and fourth signals ((B+C)−(A+D)); circuitry configured to produce a total irradiance signal that is indicative of a sum of the first, second, third and fourth signals (A+B+C+D); circuitry configured to produce, in dependence on the first and second motion signals, a signal and/or data that is indicative of a direction of motion of an object; circuitry configured to produce, in dependence on the first and second motion signals, a signal and/or data that is indicative of a rate of motion of an object; and circuitry configured to distinguish between an active stroke motion of an object and a retrace motion of an object in dependence on the signal and/or data that is indicative of a rate of motion of an object and on the total irradiance signal.