Patent ID: 7866557
Filing Date: 2011-01-11
Classification: G06K

Abstract:
1. An imaging system for use in an imaging-based bar code reader to image a target bar code, the imaging system comprising: an illumination system, when actuated, emitting a pulse of illumination; a 2D sensor array configured in a rolling shutter mode of electronic shutter operation and generating a series of image frames of a field of view of the imaging system, the sensor array selectively operable in a rolling shutter mode of operation wherein commencement of image frame exposure times are staggered for adjacent rows of the sensor array and operable in a pseudo-global shutter mode of operation wherein image frame exposure times commenced sequentially for adjacent rows of the sensor array are overlapping such that there is a common exposure time wherein substantially all of the rows of the sensor array are simultaneously exposed and further wherein, for at least a portion of the common exposure time, the illumination system is actuated to emit an illumination pulse; an imaging lens assembly to focus light from the field of view onto the sensor array; and an image analysis system for analyzing the series of image frames generated by the sensor array for image brightness and, based on image brightness, operating the sensor array in a selected one of the rolling shutter mode of operation and the pseudo-global shutter mode of operation.