EP1891609B1 - Verfahren zur detektierung eines gegenstandes in einem raum - Google Patents

Verfahren zur detektierung eines gegenstandes in einem raum Download PDF

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Publication number
EP1891609B1
EP1891609B1 EP06778587.3A EP06778587A EP1891609B1 EP 1891609 B1 EP1891609 B1 EP 1891609B1 EP 06778587 A EP06778587 A EP 06778587A EP 1891609 B1 EP1891609 B1 EP 1891609B1
Authority
EP
European Patent Office
Prior art keywords
screen
shadow
space
airlock
light beam
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.)
Not-in-force
Application number
EP06778587.3A
Other languages
English (en)
French (fr)
Other versions
EP1891609A2 (de
Inventor
Jean-Christophe Fondeur
Laurent Lambert
Gilles Monteilliet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Idemia Identity and Security France SAS
Original Assignee
Morpho SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Morpho SA filed Critical Morpho SA
Priority to PL06778587T priority Critical patent/PL1891609T3/pl
Publication of EP1891609A2 publication Critical patent/EP1891609A2/de
Application granted granted Critical
Publication of EP1891609B1 publication Critical patent/EP1891609B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19602—Image analysis to detect motion of the intruder, e.g. by frame subtraction
    • 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
    • G07C9/30—Individual registration on entry or exit not involving the use of a pass
    • G07C9/32—Individual registration on entry or exit not involving the use of a pass in combination with an identity check
    • G07C9/37—Individual registration on entry or exit not involving the use of a pass in combination with an identity check using biometric data, e.g. fingerprints, iris scans or voice recognition

Definitions

  • the present invention relates to a method of analyzing a presence in a space, used in particular in automated systems for controlling access to places or people identification.
  • the analysis does not focus on the body itself but on the shadow on it on a screen.
  • the image of the shadow on the screen is a binary image whose processing is relatively easy.
  • the analysis of the body shadow is thus more simple, reliable and fast than the analysis of the body itself and requires relatively limited computer resources.
  • the source of the light beam and the screen can easily be arranged to overcome environmental constraints.
  • the intensity and wavelength of the light beam and the color of the screen can be chosen to limit the influence of ambient lighting on the density of the shadow on the screen; the source of the light beam and the screen can be positioned so as to remain discrete (the source of the light beam can for example be arranged in height and the screen can be formed by the ground and / or the bottom of the walls delimiting the space)...
  • two light beams are projected towards the screen in non-parallel directions.
  • the two bodies If two bodies are aligned in the direction of the first light beam, the two bodies project on the screen a shadow which can correspond to that which would carry only one of the bodies. However, the two bodies are then not aligned in the direction of the second light beam which will cause the appearance on the screen of a representative shadow of the two bodies.
  • the light beam has a wavelength located outside a visible range.
  • the analysis comprises a phase of detection of gray levels of the shadow on the screen.
  • the method of the invention is here described in application to a system of authorization of access to a place to analyze the presence of individuals.
  • the access authorization system comprises an airlock generally designated 1, having side walls 2, 3, extending vertically from the ground 4 to define a corridor 5 at the ends of which are provided an inlet 6 and an outlet 7 closed by doors.
  • the airlock 1 houses an identification device 8 which functions for example by fingerprint or iris recognition and which, known in itself, has not been detailed in the present description.
  • the airlock 1 is equipped with a light source 9 fixed in height on the side wall 2 to emit a light beam 10 in the corridor 5 in the direction of a screen 11 formed on a lower part of the side wall 3.
  • the light source 9 is arranged to produce a light beam 10 such that if an individual passes between the light source 9 and the screen 11, at least a portion of the individual carries a shadow on the screen 11.
  • the screen is in particular chosen in line with the lighting so that a drop shadow on the screen stands out clearly on this one.
  • the light beam 10 here has a wavelength comprised in the infrared spectrum and the screen 11 is here an opaque surface of uniform color, in this case white.
  • the airlock 1 is equipped with a camera 12 fixed to the airlock, here above the entrance 4, to provide images of the screen 11.
  • the camera 12 is connected to an image processing unit 13 known in itself and able to distinguish gray levels on the images provided by the camera 12.
  • the processing unit 13 provides the processing unit 13 a signal representative of at least one image on which the processing unit 13 can detect two areas of high gray levels standing out on a white area (the gray levels are shown schematically in the diagram of the figure 3 ).
  • the screen 11 has known characteristics (since the screen 11 is chosen by the user), its contribution to the signal is known and can be neglected or retained as a reference, the variations of the signal not resulting this contribution of the screen being the result of a shadow on the screen. It is thus possible to analyze a presence in space 5 from a single image.
  • the processing unit 13 emits a warning signal to warn an operator so that he comes to note the presence of the individuals and asks an explanation to them.
  • the access authorization system according to the second embodiment comprises an airlock 1 identical to that of the first embodiment.
  • the airlock 1 is however here equipped with two light sources 20, 21 arranged to project in the corridor 5 two light beams 22, 23 to a screen 24 in non-parallel directions.
  • the beams can also be parallel but offset in space.
  • the screen 24 is positioned in the airlock 1 as in the first embodiment.
  • the screen 24 is in the second embodiment a translucent screen and a camera 25 is disposed on one side of the screen 24 opposite to the light sources 20, 21.
  • the processing unit 13 supplies the processing unit 13 at least one image on which the processing unit 13 can detect two zones of average gray levels 26, 27 (corresponding to the shadow resulting from the obstruction of only one of the light beams 22, 23) on either side of a large high gray level zone 28 (corresponding to the superposition of the shadows resulting from the obstruction of the light beams 22, 23) coming off a white zone (the gray levels are shown schematically on the diagram of the figure 5 ).
  • the image provided by the camera 25 then comprises two areas of average gray levels (corresponding to the shadow resulting from obstructing only one of the light beams 22, 23) on either side of a relatively narrow high gray level area (corresponding to the superposition of the shadows resulting from the obstruction of the light beams 22, 23) standing out on a white area.
  • the processing unit 13 emits a warning signal to warn an operator so that he comes to note the presence of the individuals and asks an explanation to them.
  • the number of light sources may be greater than two and / or a light source may be movable to scan the space to be monitored.
  • the light source may be arranged to emit a light beam whose spectrum is located in the visible range or outside thereof.
  • the light source may be a flash synchronized with a shooting device.
  • the screen can be an opaque or translucent surface, flat or curved, without continuity solution or formed of offset vertical blades (so that the camera can see the shadow on the screen while having its optical axis perpendicular to the screen).
  • the shadow can be analyzed from the illuminated side of the screen or, for example when the screen is translucent, the shadow can be analyzed from a side of the screen opposite to a source of the light beam.
  • the screen may be formed by a part of the floor or ceiling and / or by a lower part of an adjoining wall.
  • the analysis can be performed on one or more images.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Collating Specific Patterns (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Lock And Its Accessories (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Image Processing (AREA)

Claims (2)

  1. Verfahren zur Präsenzanalyse in einem Raum (5), umfassend die Schritte:
    - Projizieren mindestens zweier Lichtstrahlen (10; 22, 23) mit nicht parallelen Richtungen in den Raum (5) und in Richtung eines Bildschirms (11; 24) derart, dass mindestens ein Teil eines Körpers (A, B), der sich in dem Raum befindet, einen Schatten auf den Bildschirm wirft,
    - Analysieren des auf den Bildschirm geworfenen Schattens, indem Graustufenzonen des auf den Bildschirm geworfenen Schattens detektiert und die Breiten der Graustufenzonen erfasst werden, um herzuleiten, ob entweder ein oder mehrere Körper in dem Raum vorhanden sind.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Lichtstrahlen (10) eine Wellenlänge haben, die sich außerhalb eines sichtbaren Bereichs befindet.
EP06778587.3A 2005-06-08 2006-06-08 Verfahren zur detektierung eines gegenstandes in einem raum Not-in-force EP1891609B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06778587T PL1891609T3 (pl) 2005-06-08 2006-06-08 Sposób analizy obecności w przestrzeni

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0505810A FR2887061B1 (fr) 2005-06-08 2005-06-08 Procede d'analyse d'une presence dans un espace
PCT/FR2006/001295 WO2006131647A2 (fr) 2005-06-08 2006-06-08 Procede d'analyse d'une presence dans un espace

Publications (2)

Publication Number Publication Date
EP1891609A2 EP1891609A2 (de) 2008-02-27
EP1891609B1 true EP1891609B1 (de) 2016-11-30

Family

ID=35735190

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06778587.3A Not-in-force EP1891609B1 (de) 2005-06-08 2006-06-08 Verfahren zur detektierung eines gegenstandes in einem raum

Country Status (5)

Country Link
US (1) US7742175B2 (de)
EP (1) EP1891609B1 (de)
FR (1) FR2887061B1 (de)
PL (1) PL1891609T3 (de)
WO (1) WO2006131647A2 (de)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3758723A (en) * 1972-01-18 1973-09-11 Imagex Inc X-ray inspection system
DE2620240A1 (de) * 1976-05-07 1977-11-24 Bosch Gmbh Robert Verfahren und vorrichtung zur pruefung lichtundurchlaessiger werkstuecke
US4695130A (en) * 1983-09-30 1987-09-22 Antonio Medina Camera flash attachment for three dimensional imaging systems
DE4009912A1 (de) * 1990-03-28 1991-10-02 Grundig Emv Videokontroll-einrichtung
DE69312257T2 (de) * 1993-02-11 1998-01-29 Agfa Gevaert Nv Strahlungsfelderkennungsverfahren
JPH0778267A (ja) * 1993-07-09 1995-03-20 Silicon Graphics Inc 陰影を表示する方法及びコンピュータ制御表示システム
DE4415944C2 (de) * 1994-05-05 1998-07-09 Karl Stefan Riener Elektronische Zielscheibe und Verfahren zu dessen Auswertung
GB2316169A (en) * 1996-08-08 1998-02-18 Secr Defence Optical detection system
US6437782B1 (en) * 1999-01-06 2002-08-20 Microsoft Corporation Method for rendering shadows with blended transparency without producing visual artifacts in real time applications
EP1037181A3 (de) * 1999-03-12 2005-01-19 Delphi Technologies, Inc. Verfahren und System zum Überwachen eines Innenraums
US20050134588A1 (en) * 2003-12-22 2005-06-23 Hybrid Graphics, Ltd. Method and apparatus for image processing
FR2866718B1 (fr) * 2004-02-24 2006-05-05 Essilor Int Dispositif centreur-bloqueur d'une lentille ophtalmique de lunettes, methode de detection automatique et methodes de centrage manuel associees

Also Published As

Publication number Publication date
PL1891609T3 (pl) 2017-07-31
WO2006131647A2 (fr) 2006-12-14
US7742175B2 (en) 2010-06-22
WO2006131647A3 (fr) 2007-02-01
FR2887061A1 (fr) 2006-12-15
FR2887061B1 (fr) 2007-08-17
US20090128817A1 (en) 2009-05-21
EP1891609A2 (de) 2008-02-27

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