Optics: measuring and testing – Range or remote distance finding – With photodetection
Reexamination Certificate
2008-05-27
2008-05-27
Tarcza, Thomas H. (Department: 3662)
Optics: measuring and testing
Range or remote distance finding
With photodetection
Reexamination Certificate
active
07379163
ABSTRACT:
Performance of pixel detectors in a TOF imaging system is dynamically adjusted to improve dynamic range to maximize the number of pixel detectors that output valid data. The invention traverses the system-acquired z depth, the brightness, and the active brightness images, and assigns each pixel a quantized value. Quantization values encompass pixels receiving too little light, normal light, to too much light. Pixels are grouped into quantized category groups, whose populations are represented by a histogram. If the number of pixels in the normal category exceeds a threshold, no immediate corrective action is taken. If the number of pixel receiving too little (or too much) light exceeds those receiving too much (or too little) light, the invention commands at least one system parameter change to increase (or decrease) light reaching the pixels. Controllable TOF system parameters can include exposure time, common mode resets, video gain, among others.
REFERENCES:
patent: 5981965 (1999-11-01), Pryor et al.
Gokturk Salih Burak
Rafii Abbas
Canesta, Inc.
Canesta, Inc.
Kaufman Michael A.
Ratcliffe Luke
Tarcza Thomas H.
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