Patent ID: 9038903
Filing Date: 2015-05-26
Classification: G06K

Abstract:
1. A method of operating emitting mostly invisible light towards a target object from a light emitting diode within a housing having a first window located in a generally horizontal plane and a second window located in a generally upright plane that intersects the generally horizontal plane; detecting returned invisible light from the target object with a photodetector to generate an electrical signal; activating an illumination source to provide an illumination light toward the target object after the electrical signal generated by the photodetector indicates that the returned invisible light from the target object is detected; capturing light returned from the target object with a plurality of imaging sensors through the first window or through the second window, wherein each of the imaging sensors has an array of photosensitive elements; transmitting from at least one of the imaging sensors to a controller a short frame data that is collected by the at least one of the imaging sensors when the illumination source is activated to provide the illumination light toward the target object with a first illumination level; and transmitting subsequently from the at least one of the imaging sensors to the controller a regular frame data that is collected by the at least one of the imaging sensors when the illumination source is activated to provide the illumination light toward the target object with a second illumination level that is determined based upon the short frame data, the size of the regular frame data being at least 50 times larger than the size of the short frame data.