Person-number detecting system
First Claim
1. A person-number detecting system comprising infrared ray detecting means, optical means for circularly scanning a visual field of said infrared ray detecting means, preamplifying means for amplifying an output signal of said detecting means, signal processing means for converting an output signal of said preamplifying means to a signal for detection of the number of persons in said visual field, means for discriminating the number of persons on the basis of said signal of said signal processing means, and means for providing person-number information on the basis of an output signal of said discriminating means, wherein said circular scanning optical means includes means for restricting said visual field of said infrared ray detecting means in a circular scanning direction, a rotary member bearing said visual field restricting means, and means for driving said rotary member.
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Abstract
A person-number detecting system which comprises a detector for detecting infrared rays emitted from persons'"'"' bodies to generate an output signal while a scanning optical means circularly scans a visual field of the infrared ray detector, a means for amplifying the output signal of the detector, a means for converting it to a signal necessary for detection of the number of persons located within the field, a means for discriminating the number of persons on the basis of the converted signal, and a means for outputting person number information. The system can be made simple and inexpensive, while realizing a highly precise detection of the number of persons in a wide detection zone.
58 Citations
24 Claims
- 1. A person-number detecting system comprising infrared ray detecting means, optical means for circularly scanning a visual field of said infrared ray detecting means, preamplifying means for amplifying an output signal of said detecting means, signal processing means for converting an output signal of said preamplifying means to a signal for detection of the number of persons in said visual field, means for discriminating the number of persons on the basis of said signal of said signal processing means, and means for providing person-number information on the basis of an output signal of said discriminating means, wherein said circular scanning optical means includes means for restricting said visual field of said infrared ray detecting means in a circular scanning direction, a rotary member bearing said visual field restricting means, and means for driving said rotary member.
- 13. A person-number detecting system comprising infrared ray detecting means, optical means for circularly scanning a visual field of said infrared ray detecting means, preamplifying means for amplifying an output signal of said detecting means, signal processing means for converting an output signal of said preamplifying means to a signal for detection of the number of persons in said visual field, means for discriminating the number of persons on the basis of said signal of said signal processing means, and means for providing person-number information on the basis of an output signal of said discriminating means, wherein a rotary axis of said scanning optical means is slanted downwardly closer to a wall on which the system is installed.
- 16. A person-number detecting system comprising infrared ray detecting means, optical means for circularly scanning a visual field of said infrared ray detecting means, preamplifying means for amplifying an output signal of said detecting means, signal processing means for converting an output signal of said preamplifying means to a signal for detection of the number of persons in said visual field, means for discriminating the number of persons on the basis of said signal of said signal processing means, and means for providing person-number information on the basis of an output signal of said discriminating means, wherein said discriminating means is provided for preliminarily storing as a reference waveform an input waveform received from said signal processing means corresponding to an absence of any person, and for detecting the number of persons by counting maximum values in differential waveforms corresponding to differentials between said reference waveform and a later received input waveform.
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22. A person-number detecting system comprising infrared ray detecting means, optical means for circularly scanning a visual field of said infrared ray detecting means, preamplifying means for amplifying an output signal of said detecting means, signal processing means for converting an output signal of said preamplifying means to a signal for detection of the number of persons in said visual field, means for discriminating the number of persons on the basis of said signal of said signal processing means, and means for providing person-number information on the basis of an output signal of said discriminating means, wherein said discriminating means includes reference-waveform storage means for storing an input waveform corresponding to the absence of any person, means for storing input waveforms for previous and current cycles, means for generating differential waveforms corresponding to differentials between said previous and current cycle input waveforms stored in said input waveform storage means and said reference waveform stored in said reference waveform storage means, means for counting maximum points in a combined differential waveform of said previous and current cycle differential waveforms corresponding to two cycles and indicative of presence of persons, and renewing means for transferring the input waveform stored in said input waveform storage means to said reference waveform storage means when a counting result of said maximum point counting means is zero.
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23. A person-number detecting system comprising infrared ray detecting means, optical means for circularly scanning a visual field of said infrared ray detecting means, preamplifying means for amplifying an output signal of said detecting means, signal processing means for converting an output signal of said preamplifying means to a signal for detection of the number of persons in said visual field, means for discriminating the number of persons on the basis of said signal of said signal processing means, and means for providing person-number information on the basis of an output signal of said discriminating means, wherein said discriminating means is arranged to, in the absence of any person, preliminarily store the input waveform of said signal processing means as a reference waveform, and to discriminate the number of persons on the basis of a difference between the input and reference waveforms, and to sequentially renew parts of the reference waveform other than parts corresponding to persons.
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24. A person-number detecting system comprising infrared ray detecting means, optical means for circularly scanning a visual field of said infrared ray detecting means, preamplifying means for amplifying an output signal of said detecting means, signal processing means for converting an output signal of said preamplifying means to a signal for detection of the number of persons in said visual field, means for discriminating the number of persons on the basis of said signal of said signal processing means, and means for providing person-number information on the basis of an output scanning optical means includes an optical detector for detection of near-infrared rays and for nullifying an infrared ray input when receiving an infrared ray input containing such near-infrared rays.
Specification