Discretization of detection zone
First Claim
1. A method of detection of an object in a detection zone, for a scannerless optical rangefinder operating in pulsed Time-of-Flight operation, the method comprising:
- pulsating a light source to illuminate said detection zone using an emission beam;
receiving a reflection from said detection zone, collecting said reflection using an optical detector and generating a reflection signal;
discretizing said detection zone with at least one of emission optics and reception optics to create a predetermined detection pattern in said detection zone, said predetermined detection pattern being one of regular, uniform and random, said predetermined detection pattern including passive areas and discrete active detection areas within said detection zone;
inputting said reflection signal and a background signal into a processor;
detecting an object in one of said discrete active detection areas by comparing a change in said reflection signal with a background signal using a processor.
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Abstract
A method and system for the detection of an object in a detection zone for a scannerless optical rangefinder operating in pulsed Time-of-Flight operation are described. The method comprises pulsating a light source to illuminate the detection zone using an emission beam; receiving a reflection from the detection zone, collecting the reflection using an optical detector and generating a reflection signal; discretizing the detection zone to create a predetermined detection pattern in the detection zone, the predetermined detection pattern being one of regular, uniform and random, the predetermined detection pattern including passive areas and discrete active detection areas within the detection zone; detecting an object in one of the discrete active detection areas by comparing a change in the reflection signal with a background signal.
258 Citations
19 Claims
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1. A method of detection of an object in a detection zone, for a scannerless optical rangefinder operating in pulsed Time-of-Flight operation, the method comprising:
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pulsating a light source to illuminate said detection zone using an emission beam; receiving a reflection from said detection zone, collecting said reflection using an optical detector and generating a reflection signal; discretizing said detection zone with at least one of emission optics and reception optics to create a predetermined detection pattern in said detection zone, said predetermined detection pattern being one of regular, uniform and random, said predetermined detection pattern including passive areas and discrete active detection areas within said detection zone; inputting said reflection signal and a background signal into a processor; detecting an object in one of said discrete active detection areas by comparing a change in said reflection signal with a background signal using a processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A presence detection system for a detection of an object in a detection zone, for a scannerless optical rangefinder operating in pulsed Time-Of-Flight operation, the system comprising:
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at least one light source adapted to be pulsed to illuminate said detection zone using an emission beam; an optical detector for receiving and collecting a reflection from said detection zone and for generating a reflection signal; at least one of emission optics and reception optics for discretizing said detection zone to create a predetermined detection pattern in said detection zone, said predetermined detection pattern being one of regular, uniform and random, said predetermined detection pattern including passive areas and discrete active detection areas within said detection zone; a processor in electronic communication with at least said optical detector, said processor being programmed with computer-readable instructions, for detecting an object in one of said discrete active detection areas by comparing a change in said reflection signal with a background signal and for outputting a signal based on said detecting said object. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification