Patent ID: 8538097
Filing Date: 2013-09-17
Classification: G06F

Abstract:
1. A user input apparatus comprising: a two line object imaging sensor having a primary line scan-sensor providing a primary line scan-sensor output and a secondary line scan-sensor providing a secondary line scan-sensor output, each representing, respectively, the pixels in a current primary scan row of pixels and a current secondary scan row of pixels, the primary line scan-sensor and the secondary line scan-sensor each adapted to scan an object; a storage apparatus storing for each scan time each current primary line scan-sensor output to maintain a plurality of stored representations of pixels in a row of pixels for a plurality of past primary line scan sensor outputs and storing each current secondary line scan-sensor output to maintain a plurality of stored representations of pixels in a row of pixels for a plurality of past secondary line scan sensor outputs; a correlation unit correlating at least one of the current representations of pixels in a primary line scan-sensor output with stored representations of pixels in a row of pixels for respective ones of the plurality of past secondary line scan-sensor outputs and the current representations of pixels in a secondary line scan-sensor output with stored representations of pixels in a row of pixels for respective ones of the plurality of past primary line scan-sensor outputs; and, the correlation unit providing as an output a motion indicator comprising a direction and amplitude of the motion of the object being scanned in a coordinate system coplanar with the primary and secondary line scan-sensors and aligned to the primary line scan sensor and the secondary line scan-sensor.