EP1224632A1 - Detection device - Google Patents
Detection deviceInfo
- Publication number
- EP1224632A1 EP1224632A1 EP01954036A EP01954036A EP1224632A1 EP 1224632 A1 EP1224632 A1 EP 1224632A1 EP 01954036 A EP01954036 A EP 01954036A EP 01954036 A EP01954036 A EP 01954036A EP 1224632 A1 EP1224632 A1 EP 1224632A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- detection device
- designed
- evaluation unit
- sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 59
- 230000005855 radiation Effects 0.000 claims abstract description 68
- 238000011156 evaluation Methods 0.000 claims abstract description 38
- 230000005670 electromagnetic radiation Effects 0.000 claims abstract description 4
- 239000011159 matrix material Substances 0.000 claims description 18
- 230000006870 function Effects 0.000 claims description 7
- 230000037308 hair color Effects 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims 3
- 230000000737 periodic effect Effects 0.000 claims 1
- 230000002123 temporal effect Effects 0.000 abstract 1
- 230000000875 corresponding effect Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
Definitions
- the invention relates to a detection device for detecting people or objects and their direction of movement, with a sensor arrangement for detecting electromagnetic radiation with the wavelength of visible and / or invisible light which is reflected or emitted by a person or an object, and with an evaluation unit which is associated with is connected to the sensor arrangement and is designed to derive a signal from the radiation detected by the radiation sensor arrangement and to emit a detection signal for as far as possible every object or person detected by the radiation sensor arrangement.
- the invention relates to a counting device for people, which is connected to a corresponding detection device.
- One area of application of such detection devices is the detection of people who cross the entry or exit area of a means of transport in order to count the number of passengers who get on or leave the means of transport.
- detection devices which have sensor elements arranged one behind the other with respect to the intended direction of movement of the passengers and which determine the direction of movement of persons detected by correlating the radiation detected by the sensor elements. Such detection devices are thus able not only to determine the presence of an object or a person, as in the case of a simple light barrier, but also their direction of movement.
- One problem is to reliably detect people who are not moving in a targeted manner, who, for example, stop in the entrance area of a bus, or to distinguish the signals originating from different people in close proximity to one another.
- DE 197 21 741 One approach to solving the latter problem is mentioned in DE 197 21 741.
- a continuous distance signal for detected objects and to compare the distance function obtained in this way with predetermined or stored distance characteristics of known objects in order to obtain information about the number, the movement or the type of objects.
- this is done by means of an active signal transmitter / detector arrangement. Active means that the detector picks up the radiation emitted by the signal transmitter and reflected by the object or person.
- a detection device of the type mentioned at the outset which comprises individualization means which are connected to the evaluation unit and designed to obtain information individualizing an object or a person and which is connected to a memory which is designed, at least one section to store the progress signal and the information individualizing the object or person as characteristic parameters associated with the progress signal.
- the parameter can be derived directly from the course signal or from the course signal and an additional signal that can be obtained by an additional passive sensor and / or can be derived from an active radiation source.
- the parameter can also be one-dimensional or multidimensional, for example a matrix or a vector with multiple values, which in particular individualize a person.
- the invention is based on the idea of combining, in a manner known per se, a passively obtainable course signal with at least one characteristic parameter, so that an at least two-dimensional signal or parameter matrix results, which also contains information about the time course of the radiation detected by the sensor arrangement combined additional information.
- a motion signal to be derived from the history signal by signal correlation in a manner known per se from DE 42 20508 or EP 0 515 635 and to assign this motion signal as reliably as possible to an individual object or person using the characteristic parameter or parameters.
- the characteristic parameter preferably describes a person-specific parameter, such as hair color, size, stature, etc.
- the additional, characteristic parameter can be determined solely from the signal morphology.
- the invention preferably provides the detection device with additional means for determining the characteristic parameter.
- additional means two alternatives have proven to be particularly suitable in an unpredictable manner, namely a radiation source in order to implement an active arrangement of the detection device, or alternatively or additionally an additional sensor for detecting a further signal in addition to the radiation, for example one acoustic signal or an odor signal.
- the additional parameter can be determined by evaluating the radiation reflected by an object or a person in relation to the radiation emitted by the radiation source. In this way, information about the transit time of a signal from the radiation source via a reflective person to the sensor arrangement or the degree of reflection can be obtained.
- the range greater than 1400 nm is preferred as the frequency or wavelength range of the electromagnetic radiation, for the detection of which the sensor arrangement is designed. In the case of an active arrangement with a radiation source, this wavelength range also applies to the radiation source. It has been found that both a favorable signal-to-noise ratio and a high level of eye safety can be achieved in this wavelength range.
- a radiation power lying in this wavelength range can be more than 1000 times greater than, for example, in the range of 1050 nm, without this being associated with a health hazard.
- configurations of the detection device are preferred which are designed to be arranged in entry and exit openings, for example doors of vehicles or rooms.
- a preferred area of application for the detection device is passenger counting for example in buses.
- the detection device is preferably connected to a location transmitter such as a GPS receiver.
- the passenger numbers determined by the detection device by means of a counting unit for the boarding and disembarking passengers can thus be assigned to specific routes or stops of a bus.
- integrated vehicle management is possible. This can be used for an entire vehicle fleet if the detection devices and location transmitters of different vehicles are designed to be connectable to a central station by radio.
- the radiation source is arranged, for example, in the entrance area of a vehicle in such a way that the radiation emanating from the radiation source hits the person crossing the entrance area from above and is reflected from the top of the head in such a way that the size of a is determined from the transit time of the signal Person can be determined.
- the characteristic parameter to be stored then corresponds to the size of the person.
- the synchronously recorded progress signal can be uniquely assigned to a person of the appropriate size using the characteristic parameter. Since most people differ in size, at least within certain limits, a largely individual assignment of history signals is possible in this way, so that such history signals can also be assigned as starting from two different people, which result from that of two in close proximity to one another result in outgoing radiation.
- An essential difference from the device known from DE 197 21 741 is that, for example in the case of determining the size of the person to form the characteristic parameter, the distance function - that is to say the change in distance - is not stored and compared with other distance functions, but rather only the minimum of the distance between the radiation source and the sensor arrangement on the one hand and the top of a person's head on the other hand.
- both the solutions known from DE 42 20 508 and EP 0 515 635 and from DE 197 21 741 are based solely on the correlation of two signal profiles or functions.
- the characteristic parameter is not derived from a comparison or a correlation of functions under signal profiles, but rather is formed from a signal alone.
- This signal can originate, for example, from an infrasound sensor for detecting heart sounds and thus the heart rate, or from the arrangement already described for detecting the size of the person, or also from a sensor matrix arrangement onto which an image of the people crossing an entrance area is projected, so that from the image a parameter characterizing the contour of the people can be obtained.
- the sensor matrix arrangement can be connected to a radiation source of the type described above to form an active sensor, so that a three-dimensional height contour of a detected person can be recorded as a characteristic parameter.
- At least one corresponding sensor is preferably provided in each case for recording such or other signals individualizing a person.
- This sensor is preferably switched on when the signal shows that the person being detected is currently very close to the sensor. Alternatively, the sensor remains switched on continuously and only that section of the signal originating from the sensor is used which was recorded at the point of greatest proximity to the sensor.
- the detection device preferably comprises corresponding location or distance determination means and a selection unit connected to this, which selects the corresponding signal section originating from the sensor for further processing.
- several characteristic parameter or parameter profiles can be obtained simultaneously and combined with one another in order to enable an even more precise differentiation of the information obtained and thus an even clearer individualization of the persons recorded. Further preferred embodiments are mentioned in the subclaims.
- this includes detection devices with an additional sensor for individual characteristics such as size, shape, hair color, heart sounds or smell of a person or an object.
- Figure 1 shows a first variant of a detection device with an active
- FIG. 2 shows a detection device similar to FIG. 1 with a passive sensor unit and an additional sensor for a person-specific feature;
- Figure 3 shows a detection device with a passive sensor matrix
- FIG. 4 shows a detection device similar to FIG. 3 with an active sensor matrix for recording a multidimensional person-specific feature.
- the detection device 10 shown in FIG. 1 has two infrared sensors 12 and 14 which, for example, enter or exit the entry area of a bus Exit direction can be arranged arranged one behind the other.
- An infrared radiation source 16 is attached between the two sensors 12 and 14.
- the sensors 12 and 14 and the radiation source 16 are each connected to an evaluation unit 18.
- the evaluation unit 18 comprises three modules, a distance module 18.1, a correlation module 18.2 and an assignment module 18.3.
- the evaluation unit 18 is also connected to a memory 20 and a counting unit 22.
- the sensor 12 and the radiation source 16 are connected together with the distance module 1 8.1 of the evaluation unit 18.
- the distance module 18.1 the phase relationship between the radiation emitted by the radiation source 16 and the radiation received by the sensor 12 is determined and thus the transit time is determined which the signal emitted by the radiation source 16 and reflected by an object requires in order to be transmitted by the sensor 12 to be included.
- the distance between radiation source 16 and sensor 12 on the one hand and a reflecting surface on the other hand can be determined.
- the distance to a reflecting object can also be determined directly via the wavelength of the signal emitted by the radiation source 16 and the phase relationship between emitted and received radiation. The technologies required for this are generally known.
- the size of a person crossing the boarding area can be inferred from the minimum of a sequence of successive distance measurements. This minimum is stored as a person size in the memory 20 and represents a parameter characteristic of the person.
- the radiation signals reflected or emitted by a person are recorded with the two sensors 12 and 14 and correlated with one another. Due to the movement of a person 24 getting on the bus, for example, the two radiation sensors 12 and 14 similar course signals that are time-shifted from each other. The direction of movement and the speed of a person 24 getting in or out can be determined from the distance between the two sensors 12 and 14 and the time offset between the course signals recorded by them.
- the signal picked up by sensor 12 changes compared to the signal picked up by sensor 14 or vice versa, this is an indication of a reflecting or radiating object in the detection range of sensors 12 and 14. Changes in the radiation background occur synchronously by both sensors 12 and 14 and can therefore be hidden. If the evaluation of the course signals of the sensors 12 and 14 obtained in this way reveals that the two course signals have a time offset or do not correlate with one another in such a way that the correlation exceeds a certain measure, the speed of an object can be determined from the time offset of the signals.
- the assignment module 18.3 is able to identify a person as getting in or out.
- the counting unit 22 is connected to the assignment module 18.3 and is designed such that a counter is increased by one for each person identified by the assignment module 18.3 as rising, and decreased by one for each person who exits.
- the counter reading in the counting unit 22 thus indicates the number of people who are on a bus, for example.
- the counting unit can be connected to a plurality of evaluation units 18 which are assigned to a plurality of input areas of a means of transport.
- the detection device 10 'in FIG. 2 has a passive sensor unit formed by the sensors 12 and 14 for recording the progress signal.
- an additional sensor 26 is provided, which records a person-specific feature, such as the hair color or heart tones or the like.
- the additional signal is evaluated by an evaluation module 18.1 'of the evaluation unit 18'.
- the assignment to the course signal recorded by the sensors 12 and 14 is carried out, as already described for FIG. 1, by the assignment module 18.3.
- the evaluated additional signal is assigned to the history signal and stored in the memory 20.
- the detection device 30 in FIG. 3 is constructed similarly to the detection device 10 from FIG. 1. Two infrared sensors 32 and 34, an evaluation unit 36, a memory 38 and a counting unit 40 are also provided. Not an active radiation source such as radiation source 16 from FIG. 1 is provided.
- the sensor 32 contains a plurality of sensor elements 32.1 in a matrix-like arrangement.
- the sensor elements 32.1 are in the focus of an imaging device as in a converging lens 32.2. The radiation emanating from a person 42 is thus projected onto the sensor matrix 32.1 as an image of the person 42.
- Each person results in a largely individual projection pattern, which is characteristic of the respective person 42.
- This projection pattern is fed to an image module 36.1 of the evaluation unit 36.
- a characteristic pattern is extracted as a characteristic parameter from the projection pattern and stored in the memory 38.
- course signals are recorded using sensors 32 and 34. It is sufficient if the sensor 34 contains only one sensor element and only one sensor element of the sensor matrix 32.1 is used for the course signal of the sensor 32.
- the two course signals are correlated with one another in a correlation module 36.2 of the evaluation unit 36 in order to obtain movement information.
- This movement information is stored in the memory 38 in association with the corresponding characteristic pattern.
- An assignment module 36.3 of the evaluation unit 36 works analogously to the assignment module 18.3 from FIG. 1 and, depending on the possibly stored output values of the image module 36.1 and the correlation module 36.2, outputs a signal for each person getting on or off, which is used to control the counting unit 40 and increases or decreases a counter accordingly.
- the detection device 30 'from FIG. 4 differs from the detection device 30 from FIG. 3 essentially in that it comprises a radiation source 44, which makes it possible to expand the sensor matrix 32.1 into an active sensor unit. By means of the radiation source 44 and the sensor matrix 32.1, it is possible to form a three-dimensional contour of an object or a person in the detection area of the sensor matrix 32.1.
- the evaluation module 36.1 ' is connected to the radiation source 44 and the sensor matrix 32.1 and is designed such that the radiation emitted by the radiation source 44, reflected by a person or an object and detected by the sensor matrix 32.1 forms a matrix which corresponds to the three-dimensional surface contour of the object or person.
- This matrix is stored as a characteristic parameter and information individualizing the respective person in the memory 38 is assigned to the progress signal.
- the assignment module 36.3 is designed to compare matrices recorded when people get in with matrices that were recorded when people get out. The direction of entry and exit results from the progress signal.
- the assignment module 36.3 is also designed for the matrix comparison for transforming matrices, in particular for rotating matrices, in order to be able to take into account the different orientation of people entering and exiting and the resulting change in the contour images to be compared.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Radar Systems Or Details Thereof (AREA)
- Time Recorders, Dirve Recorders, Access Control (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
- Optical Radar Systems And Details Thereof (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
- Eye Examination Apparatus (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10034976 | 2000-07-13 | ||
DE10034976A DE10034976B4 (en) | 2000-07-13 | 2000-07-13 | Detecting device for detecting persons |
PCT/EP2001/008067 WO2002007106A1 (en) | 2000-07-13 | 2001-07-12 | Detection device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1224632A1 true EP1224632A1 (en) | 2002-07-24 |
EP1224632B1 EP1224632B1 (en) | 2009-12-16 |
Family
ID=7649374
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01954036A Expired - Lifetime EP1224632B1 (en) | 2000-07-13 | 2001-07-12 | Detection device |
Country Status (12)
Country | Link |
---|---|
US (1) | US6774369B2 (en) |
EP (1) | EP1224632B1 (en) |
JP (1) | JP5064637B2 (en) |
CN (1) | CN1243327C (en) |
AT (1) | ATE452387T1 (en) |
AU (1) | AU2001276401A1 (en) |
BR (1) | BR0106974B1 (en) |
DE (2) | DE10034976B4 (en) |
ES (1) | ES2337232T3 (en) |
MX (1) | MXPA02002509A (en) |
RU (1) | RU2302659C2 (en) |
WO (1) | WO2002007106A1 (en) |
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US10488492B2 (en) | 2014-09-09 | 2019-11-26 | Leddarttech Inc. | Discretization of detection zone |
USRE48763E1 (en) | 2011-05-11 | 2021-10-05 | Leddartech Inc. | Multiple-field-of-view scannerless optical rangefinder in high ambient background light |
USRE48914E1 (en) | 2012-03-02 | 2022-02-01 | Leddartech Inc. | System and method for multipurpose traffic detection and characterization |
USRE49342E1 (en) | 2007-12-21 | 2022-12-20 | Leddartech Inc. | Distance detection method and system |
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-
2001
- 2001-07-12 DE DE50115259T patent/DE50115259D1/en not_active Expired - Lifetime
- 2001-07-12 BR BRPI0106974-8A patent/BR0106974B1/en not_active IP Right Cessation
- 2001-07-12 CN CN01802741.5A patent/CN1243327C/en not_active Expired - Lifetime
- 2001-07-12 RU RU2002109242/09A patent/RU2302659C2/en active
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- 2001-07-12 MX MXPA02002509A patent/MXPA02002509A/en active IP Right Grant
- 2001-07-12 AU AU2001276401A patent/AU2001276401A1/en not_active Abandoned
- 2001-07-12 AT AT01954036T patent/ATE452387T1/en not_active IP Right Cessation
- 2001-07-12 EP EP01954036A patent/EP1224632B1/en not_active Expired - Lifetime
- 2001-07-12 WO PCT/EP2001/008067 patent/WO2002007106A1/en active Application Filing
- 2001-07-12 US US10/070,871 patent/US6774369B2/en not_active Expired - Lifetime
- 2001-07-12 ES ES01954036T patent/ES2337232T3/en not_active Expired - Lifetime
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Cited By (7)
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USRE49342E1 (en) | 2007-12-21 | 2022-12-20 | Leddartech Inc. | Distance detection method and system |
USRE49950E1 (en) | 2007-12-21 | 2024-04-30 | Leddartech Inc. | Distance detection method and system |
USRE48763E1 (en) | 2011-05-11 | 2021-10-05 | Leddartech Inc. | Multiple-field-of-view scannerless optical rangefinder in high ambient background light |
USRE48914E1 (en) | 2012-03-02 | 2022-02-01 | Leddartech Inc. | System and method for multipurpose traffic detection and characterization |
USRE50261E1 (en) | 2012-03-02 | 2025-01-07 | Leddartech Inc. | System and method for multipurpose traffic detection and characterization |
US10488492B2 (en) | 2014-09-09 | 2019-11-26 | Leddarttech Inc. | Discretization of detection zone |
DE102017126553A1 (en) | 2017-11-13 | 2019-05-16 | Iris-Gmbh Infrared & Intelligent Sensors | acquisition system |
Also Published As
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US20020148965A1 (en) | 2002-10-17 |
MXPA02002509A (en) | 2004-09-10 |
DE10034976B4 (en) | 2011-07-07 |
EP1224632B1 (en) | 2009-12-16 |
BR0106974B1 (en) | 2012-12-11 |
JP2004504613A (en) | 2004-02-12 |
ATE452387T1 (en) | 2010-01-15 |
DE50115259D1 (en) | 2010-01-28 |
CN1243327C (en) | 2006-02-22 |
AU2001276401A1 (en) | 2002-01-30 |
JP5064637B2 (en) | 2012-10-31 |
CN1393005A (en) | 2003-01-22 |
ES2337232T3 (en) | 2010-04-22 |
RU2302659C2 (en) | 2007-07-10 |
WO2002007106A1 (en) | 2002-01-24 |
RU2002109242A (en) | 2004-02-10 |
BR0106974A (en) | 2002-05-21 |
US6774369B2 (en) | 2004-08-10 |
DE10034976A1 (en) | 2002-01-31 |
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