Patent ID: 8811723
Filing Date: 2014-08-19
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 a selected portion of a current primary line scan-sensor output to maintain a plurality of stored representations of the current primary line scan-sensor output and a plurality of past primary line scan-sensor outputs and storing a selected portion of a current secondary line scan-sensor output to maintain a plurality of stored representations of the current secondary line scan-sensor output and a plurality of past secondary line scan-sensor outputs; a correlation unit configured to correlate at least one of the representation of the current primary line scan-sensor output with respective ones of the plurality of representations of past secondary line scan-sensor outputs and the representation of the current secondary line scan-sensor output with respective ones of the plurality of representations of past primary line scan-sensor outputs to find a respective match; and, the correlation unit configured to provide as an output a motion indicator comprising an 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, based at least in part on at least one of (1) a temporal separation of the primary line scan-sensor output and the secondary line scan-sensor output found to match or (2a) a line count between the primary line scan-sensor output and the secondary line scan-sensor output found to match and (2b) a spatial separation between the primary line scan sensor and the secondary line scan-sensor.