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The required conditions of photon counting and single-photon detection are theoretically derived for four different approaches: 1) photon counting and single-shot imaging; 2) photon counting and multiple-shot imaging; 3) single-photon detection and single-shot imaging; and 4) single-photon detection and multiple-shot imaging. The most important parameter for all approaches is effective quantum efficiency...
The complexity of physical protection systems has increased to address modern threats to national security and emerging commercial technologies. A key element of modern physical protection systems is the data presented to the human operator used for rapid determination of the cause of an alarm, whether false (e.g., caused by an animal, debris, etc.) or real (e.g., a human adversary). Alarm assessment...
A stereo camera based human detection framework for heavy machinery is proposed. The framework allows easy integration of different human detection and image segmentation methods. This integration is essential for diverge and challenging work machine environments, in which traditional, one detector based human detection approaches has been found to be insufficient. The framework is based on the idea...
A dual-channel imaging system with single fluorophore sensitivity was assembled in this lab. Inclusion of an integrated laser combiner was introduced to facilitate simultaneous dual-channel imaging. The imaging system has been applied to study the structure, stoichiometry, distance and function of the phi29 DNA packaging motor. Approaches including single molecule photobleaching, single molecule FRET...
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