WO2001017241A1 - Method for the simultaneous reproduction of digitally stored video images from two or more different video cameras - Google Patents

Method for the simultaneous reproduction of digitally stored video images from two or more different video cameras Download PDF

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Publication number
WO2001017241A1
WO2001017241A1 PCT/EP2000/007816 EP0007816W WO0117241A1 WO 2001017241 A1 WO2001017241 A1 WO 2001017241A1 EP 0007816 W EP0007816 W EP 0007816W WO 0117241 A1 WO0117241 A1 WO 0117241A1
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WO
WIPO (PCT)
Prior art keywords
video
camera
images
cameras
video cameras
Prior art date
Application number
PCT/EP2000/007816
Other languages
German (de)
French (fr)
Inventor
Matthias G. DÖRING
Markus Müller
Original Assignee
Geutebrück Gmbh & Co. Kg
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 Geutebrück Gmbh & Co. Kg filed Critical Geutebrück Gmbh & Co. Kg
Priority to AU74085/00A priority Critical patent/AU7408500A/en
Publication of WO2001017241A1 publication Critical patent/WO2001017241A1/en

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Classifications

    • 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
    • G08B13/19678—User interface
    • G08B13/19691—Signalling events for better perception by user, e.g. indicating alarms by making display brighter, adding text, creating a sound
    • G08B13/19693—Signalling events for better perception by user, e.g. indicating alarms by making display brighter, adding text, creating a sound using multiple video sources viewed on a single or compound screen
    • 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
    • G08B13/19639—Details of the system layout
    • G08B13/19641—Multiple cameras having overlapping views on a single scene
    • G08B13/19643—Multiple cameras having overlapping views on a single scene wherein the cameras play different roles, e.g. different resolution, different camera type, master-slave camera
    • 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
    • G08B13/19665—Details related to the storage of video surveillance data
    • G08B13/19671—Addition of non-video data, i.e. metadata, to video stream
    • G08B13/19673—Addition of time stamp, i.e. time metadata, to video stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
    • H04N5/77—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
    • H04N5/775—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N5/9201—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving the multiplexing of an additional signal and the video signal
    • H04N5/9205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving the multiplexing of an additional signal and the video signal the additional signal being at least another television signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources

Definitions

  • the invention relates to a method for the simultaneous playback of digitally stored video images in parallel in a video image recording device of two or more different video cameras with different recording rates in the respective video fields assigned to the individual video cameras.
  • VCR Video Code Division Multiple Access
  • Different requirements are usually placed on each of these video cameras. Therefore, they are often recorded at different recording rates (frames / second).
  • frames / second When displaying these images on a screen, it is possible to display several video windows in parallel in order to follow a certain process from the different camera perspectives. A new video image is always displayed alternately in the individual video windows in a conventional manner (“refresh”). If the video images of the individual video cameras have been recorded at different recording rates, an increasing time offset between the images assigned to the individual cameras can be seen during the parallel playback on the screen.
  • the video camera 1 records 1 image per second
  • the video camera 2 records 2 images per second.
  • an image from camera 1 is recorded every second from 9:00 a.m., that is to say images 1.1, 1.2, 1.3, 1.4 etc. one after the other.
  • camera 2 is removed 9:00 a.m. two pictures every second draws the pictures 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8 etc. one after the other.
  • FIG. 2 shows, the playback of the images from the two cameras 1 and 2 starts at the same time with the video images for 9:00 a.m.
  • the first playback window of the screen which is responsible for displaying the video images from camera 1
  • the video images 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 etc. of camera 1 follow one after the other in the second playback window of the screen, which is used for the display of the video images of the camera 2 is responsible
  • the video images 2.1, 2.2, 2.3, 2.4, 2.5, 2.6 etc. also follow every second.
  • the invention has for its object to provide a method for the time-synchronous playback of digitally stored video images from video cameras with different recording rates, so that it is ensured at all times that all video images shown on the screen represent a process under consideration at the same time of recording.
  • this object is achieved in that one of the video cameras is selected as a "master" camera for temporal reference, that at any time during the retrieval of the stored video images of the various video cameras the time of the currently displayed video image of the "master” camera with the times of the saved video mobil that of all other video cameras is compared and that the video image of the other video cameras stored closest to the time of the video image of the "master” camera is always selected for display in the screen field assigned to the respective video camera.
  • the method according to the invention creates a "time lock" function which makes it possible to synchronize all the reproduced images of the various video cameras to the reproduced image of a selected video camera, namely the so-called "master” camera.
  • the time of the current image in the video window of the "master" camera is compared with the times of the stored images of all other video cameras to be displayed in a video window at any time during the query of the recorded images of the different video cameras. It will always be the one that follows
  • the method according to the invention thus ensures at all times that all of the video images shown represent a considered process at essentially the same time of recording.
  • the video images of the various video cameras are advantageously displayed in parallel on a single screen in several video windows.
  • the method according to the invention can be used particularly advantageously in the context of a monitoring system. the one in which a room or a room area is observed from different perspectives with the help of the video cameras arranged in different positions.
  • FIG. 1 shows the already explained example of a recording with two video cameras in a time diagram
  • FIG. 2 shows, in a time diagram for the same two-camera example, the reproduction of the images of these two cameras that takes place in accordance with the prior art
  • FIG. 3 shows, in a time diagram for the same two-camera example, the reproduction of the images of these two cameras, which is synchronized according to the method according to the invention
  • Figure 4 is a block diagram diagram for performing the method according to the invention.
  • FIG. 3 relates to the two-camera recording example according to FIG. 1.
  • the video images of two video cameras 1 and 2 are then recorded digitally.
  • Video camera 1 records 1 image per second
  • video camera 2 records 2 images per second.
  • an image from camera 1 is recorded every second from 9:00 a.m., that is to say images 1.1, 1.2, 1.3, 1.4 etc. one after the other.
  • camera 2 is removed 9:00 a.m. two images recorded every second, that is to say images 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8 etc. one after the other.
  • FIG. 1 an image from camera 1 is recorded every second from 9:00 a.m., that is to say images 1.1, 1.2, 1.3, 1.4 etc. one after the other.
  • camera 2 is removed 9:00 a.m. two images recorded every second, that is to say images 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8 etc. one after the other.
  • FIG. 1 shows
  • the method according to the invention starts for this example, the playback of the images of the two cameras 1 and 2 at the same time with the video images for 9:00 a.m.
  • the first playback Window of the screen which is responsible for the display of the video images of the camera 1
  • the video images 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 etc. of the camera 1 which in the exemplary embodiment forms the "master" camera, one after the other.
  • the second display window of the screen which is responsible for the display of the video images of the camera 2
  • the video images 2.1, 2.3, 2.5, 2.7, etc. also follow every second. From FIG.
  • FIG. 4 shows a block diagram of a circuit for carrying out the method according to the invention.
  • a room area 3, in which processes are to be monitored from different perspectives, is monitored by two video cameras 1 and 2.
  • the images recorded by the two video cameras 1 and 2 are digitally recorded in parallel in a single video image recording device 4, called a recorder for short.
  • the images of the two cameras 1 and 2 recorded in the recorder 4 are separated and shown in parallel in two video windows 5 and 6 of a screen 7, the video window 5 being associated with the images from the camera 1 and the video window 6 with the images from the camera 2.
  • the video images of the two cameras 1 and 2 are recorded with different recording rates in the recorder 4, that is as in
  • One an algorithm-executing comparison and selection device 8 compares the time of the current image in the video window 7 of the camera 1 with the times of the ' images of the camera 2 stored in the recorder at any time during the query of the recorded images from the recorder 4 to the two cameras 1 and 2
  • the camera 1 forms the so-called "master" camera.
  • the comparison and selection device 8 continuously selects the image of the Kaera 2 that is closest in time to the master time and recorded in the recorder 4 for playback and thus causes it to be displayed in the video window 6 that is assigned to the camera 2.
  • images of the cameras 1 and 2 are therefore always shown which were recorded at essentially the same time and are therefore time-synchronous.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Library & Information Science (AREA)
  • Human Computer Interaction (AREA)
  • Closed-Circuit Television Systems (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

The invention relates to the synchronous reproduction of parallel, digital video images stored in a video image recording device (4), said images being supplied by two or more video cameras (1, 2), said video cameras having different recording speeds. Said synchronous reproduction is achieved by selecting one video camera as the master camera (1) for chronological reference purposes. During retrieval of the stored video images from the different video cameras, at the actual time correlating with the reproduced video images from the "master" camera is compared at any given moment with the times corresponding with the stored video images from the other video camera (2). The stored video image of the other video cameras which is chronologically closest to the time of the video image of the master' camera is always chosen for reproduction in a display field (5, 6) assigned to the corresponding video camera. The method according to the invention can be utilized in a surveillance system, in which a room or part of a room can be surveyed from different perspectives by locating video cameras in different positions.

Description

Verfahren zur gleichzeitig ablaufenden Wiedergabe digital gespeicherter Videobilder zweier oder mehr verschiedenerVideokamerasProcess for the simultaneous reproduction of digitally stored video images from two or more different video cameras
Die Erfindung bezieht sich auf ein Verfahren zur gleichzeitig ablaufenden Wiedergabe von parallel in einer Videobild-Aufzeichnungseinrichtung digital gespeicherten Videobildern zweier oder mehr verschiedener Videokameras mit unterschied- liehen AufZeichnungsraten in den einzelnen Videokameras jeweils zugeordneten Bildschirmfeldern.The invention relates to a method for the simultaneous playback of digitally stored video images in parallel in a video image recording device of two or more different video cameras with different recording rates in the respective video fields assigned to the individual video cameras.
Im Zusammenhang mit der digitalen Videobildaufzeichnung ist es bekannt, die Bilder verschiedener Videokameras parallel in derselben Videobild-AufZeichnungseinrichtungIn the context of digital video image recording, it is known to record the images of different video cameras in parallel in the same video image recording device
("Videorecorder") zu speichern. An jede dieser Videokameras werden zumeist unterschiedliche Anforderungen gestellt. Daher werden sie häufig mit unterschiedlicher Aufzeichnungsrate (Bilder/Sekunde) aufgezeichnet. Bei der Wiedergabe dieser Bilder auf einem Bildschirm ist es möglich, mehrere Videofen- ster parallel darzustellen, um einen bestimmten Vorgang aus den verschiedenen Kameraperspektiven zu verfolgen. Dabei wird in den einzelnen Videofenstern in herkömmlicher Weise immer abwechselnd ein neues Videobild dargestellt ("Refresh") . Sind die Videobilder der einzelnen Videokameras mit unterschiedlichen Aufzeichnungsraten aufgezeichnet worden, so ist bei der parallel ablaufenden Wiedergabe auf dem Bildschirm ein zunehmender Zeitversatz zwischen den den einzelnen Kameras zugeordneten Bildern zu erkennen.("VCR") to save. Different requirements are usually placed on each of these video cameras. Therefore, they are often recorded at different recording rates (frames / second). When displaying these images on a screen, it is possible to display several video windows in parallel in order to follow a certain process from the different camera perspectives. A new video image is always displayed alternately in the individual video windows in a conventional manner (“refresh”). If the video images of the individual video cameras have been recorded at different recording rates, an increasing time offset between the images assigned to the individual cameras can be seen during the parallel playback on the screen.
Zum vorstehend gewürdigten Stand der Technik der digitalen Bildaufzeichnung mit verschiedenen Kameras wird im folgenden anhand von zwei Figuren ein Beispiel erläutert, bei dem die Videobilder zweier Videokameras 1 und 2 digital aufgezeichnet werden. Von der Videokamera 1 wird 1 Bild pro Sekunde aufgezeichnet, wogegen von der Videokamera 2 pro Sekunde 2 Bilder aufgezeichnet werden. Bei diesem Beispiel wird also entsprechend der Figur 1 ab 9:00,00 Uhr in jeder Sekunde ein Bild der Kamera 1 aufgezeichnet, also nacheinander die Bilder 1.1, 1.2, 1.3, 1.4 etc.. Dagegen werden in diesem Beispiel von der Kamera 2 ab 9:00,00 Uhr in jeder Sekunde zwei Bilder aufge- zeichnet, also nacheinander die Bilder 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8 etc..An example in which the video images of two video cameras 1 and 2 are recorded digitally is explained in the following with reference to two figures in relation to the prior art of digital image recording with various cameras which has been recognized above. The video camera 1 records 1 image per second, whereas the video camera 2 records 2 images per second. In this example, according to FIG. 1, an image from camera 1 is recorded every second from 9:00 a.m., that is to say images 1.1, 1.2, 1.3, 1.4 etc. one after the other. In contrast, in this example camera 2 is removed 9:00 a.m. two pictures every second draws the pictures 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8 etc. one after the other.
Wie die Figur 2 zeigt, startet die Wiedergabe der Bilder der beiden Kameras 1 und 2 zum gleichen Zeitpunkt mit den Videobildern für 9:00,00 Uhr. Hierbei folgen im ersten Wiedergabefenster des Bildschirms, das für die Darstellung der Videobilder der Kamera 1 zustandig ist, nacheinander im Sekundenabstand die Videobilder 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 etc. der Kamera 1. Im zweiten Wiedergabefenster des Bildschirms, das für die Darstellung der Videobilder der Kamera 2 zustandig ist, folgen ebenfalls im Sekundenabstand die Videobilder 2.1, 2.2, 2.3, 2.4, 2.5, 2.6 etc. Aus der Figur 2 ist erkennbar, daß durch die unterschiedlichen Aufzeichnungsraster bei ab- wechselndem "Refresh" der beiden Wiedergabefenster wahrend der Darstellung die Kamera 1 nach sechs Bildern schon drei Sekunden weiter fortgeschritten ist als die Kamera 2. Es sind also dann in den beiden Wiedergabefenstern des Bildschirms keine zeitlich korrespondierenden Bilder mehr dargestellt. Der Vorgang, der von den beiden Kameras 1 und 2 beobachtet wird, kann dann also nicht mehr zeitsynchron betrachtet und entsprechend beurteilt werden.As FIG. 2 shows, the playback of the images from the two cameras 1 and 2 starts at the same time with the video images for 9:00 a.m. Here, in the first playback window of the screen, which is responsible for displaying the video images from camera 1, the video images 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 etc. of camera 1 follow one after the other in the second playback window of the screen, which is used for the display of the video images of the camera 2 is responsible, the video images 2.1, 2.2, 2.3, 2.4, 2.5, 2.6 etc. also follow every second. From FIG. 2 it can be seen that due to the different recording grids with alternating "refresh" of the two Playback window during the display, the camera 1 is already three seconds further advanced than the camera 2 after six pictures. Thus, no temporally corresponding pictures are then shown in the two display windows of the screen. The process that is observed by the two cameras 1 and 2 can then no longer be viewed synchronously and assessed accordingly.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur zeitsynchronen Wiedergabe digital gespeicherter Videobilder von Videokameras mit unterschiedlichen Aufzeichnungsraten zu schaffen, so daß jederzeit gewahrleistet ist, daß alle bild- schirmmaßig dargestellten Videobilder einen betrachteten Vorgang zum gleichen AufZeichnungszeitpunkt darstellen.The invention has for its object to provide a method for the time-synchronous playback of digitally stored video images from video cameras with different recording rates, so that it is ensured at all times that all video images shown on the screen represent a process under consideration at the same time of recording.
Gemäß der Erfindung, die sich auf em Verfahren der eingangs genannten Art bezieht, wird diese Aufgabe dadurch gelost, daß eine der Videokameras als "Master"-Kamera zur zeitlichen Bezugnahme ausgewählt wird, daß wahrend des Abrufens der ge- speicherten Videobilder der verschiedenen Videokameras jederzeit die Uhrzeit des aktuell wiedergegebenen Videobildes der "Master"-Kamera mit den Uhrzeiten der gespeicherten Videobil- der aller anderen Videokameras verglichen wird und daß stets das der Uhrzeit des Videobildes der "Master"-Kamera zeitlich am nächsten liegend gespeicherte Videobild der anderen Videokameras zur Wiedergabe im der jeweiligen Videokamera zugeord- neten Bildschirmfeld ausgewählt wird. Das Verfahren nach der Erfindung schafft eine "Time Lock"-Funktion, die es ermöglicht, alle wiedergegebenen Bilder der verschiedenen Videokameras auf das wiedergegebene Bild einer ausgewählten Videokamera, nämlich der sogenannten "Master"-Kamera, zu synchroni- sieren. Dazu wird während der Abfrage der aufgezeichneten Bilder zu den unterschiedlichen Videokameras zu jeder Zeit die Uhrzeit des aktuellen Bildes im Videofenster der "Master"-Kamera mit den Uhrzeiten der gespeicherten Bilder aller anderen in einem Videofenster darzustellenden Videoka- meras verglichen. Es wird dann nachfolgend immer das derAccording to the invention, which relates to the method of the type mentioned at the beginning, this object is achieved in that one of the video cameras is selected as a "master" camera for temporal reference, that at any time during the retrieval of the stored video images of the various video cameras the time of the currently displayed video image of the "master" camera with the times of the saved video mobil that of all other video cameras is compared and that the video image of the other video cameras stored closest to the time of the video image of the "master" camera is always selected for display in the screen field assigned to the respective video camera. The method according to the invention creates a "time lock" function which makes it possible to synchronize all the reproduced images of the various video cameras to the reproduced image of a selected video camera, namely the so-called "master" camera. For this purpose, the time of the current image in the video window of the "master" camera is compared with the times of the stored images of all other video cameras to be displayed in a video window at any time during the query of the recorded images of the different video cameras. It will always be the one that follows
"Master"-Kamera-Zeit zeitlich am nächsten liegende Videobild zur Darstellung ausgewählt und im Videofenster der zugehörigen Videokamera dargestellt. Der "Refresh" erfolgt also nicht zyklisch wie bei den bekannten Mehrkamera-Widergabeverfahren, sondern er wird zeitsynchron gesteuert. Bei der Realisierung dieses Verfahrens, insbesondere bei der Durchführung des Zeitvergleichs der Bilder der verschiedenen Kameras, kann in vorteilhafter Weise auch auf Software, die den Vergleichsund Auswählalgorithmus bewerkstelligen kann, zurückgegriffen werden."Master" camera time selected for the closest video image for display and displayed in the video window of the associated video camera. The "refresh" does not take place cyclically as in the known multi-camera playback processes, but is controlled in a time-synchronized manner. When implementing this method, in particular when carrying out the time comparison of the images of the different cameras, it is also advantageously possible to use software which can carry out the comparison and selection algorithm.
Durch das Verfahren nach der Erfindung ist somit jederzeit gewährleistet, daß alle dargestellten Videobilder einen betrachteten Vorgang zum im wesentlichen gleichen Aufzeich- nungsZeitpunkt darstellen.The method according to the invention thus ensures at all times that all of the video images shown represent a considered process at essentially the same time of recording.
In vorteilhafter Weise werden die Videobilder der verschiedenen Videokameras auf einem einzigen Bildschirm in mehreren Videofenstern parallel dargestellt.The video images of the various video cameras are advantageously displayed in parallel on a single screen in several video windows.
Das Verfahren nach der Erfindung läßt sich in besonders vorteilhafter Weise im Rahmen eines Überwachungssystems verwen- den, bei dem ein Raum oder ein Raumbereich mit Hilfe der in unterschiedlichen Positionen angeordneten Videokameras aus verschiedenen Perspektiven beobachtet wird.The method according to the invention can be used particularly advantageously in the context of a monitoring system. the one in which a room or a room area is observed from different perspectives with the help of the video cameras arranged in different positions.
Im folgenden wird die Erfindung noch anhand von Zeichnungen erläutert. Es zeigen:In the following the invention will be explained with reference to drawings. Show it:
Figur 1 in einem Zeitschema das bereits erläuterte Beispiel einer Aufzeichnung mit zwei Videokameras,FIG. 1 shows the already explained example of a recording with two video cameras in a time diagram,
Figur 2 in einem Zeitschema für das gleiche Zweikamera-Bei- spiel die entsprechend dem Stand der Technik ablaufende Wiedergabe der Bilder dieser beiden Kameras,FIG. 2 shows, in a time diagram for the same two-camera example, the reproduction of the images of these two cameras that takes place in accordance with the prior art,
Figur 3 in einem Zeitschema für das gleiche Zweikamera-Beispiel die entsprechend dem Verfahren nach der Erfindung zeitsynchron ablaufende Wiedergabe der Bilder dieser beiden Kameras, undFIG. 3 shows, in a time diagram for the same two-camera example, the reproduction of the images of these two cameras, which is synchronized according to the method according to the invention, and
Figur 4 ein Blockschaltbildschema zur Durchführung des Verfahrens nach der Erfindung.Figure 4 is a block diagram diagram for performing the method according to the invention.
Die Figur 3 bezieht sich auf das Zweikamera-AufZeichnungsbeispiel nach der Figur 1. Danach werden die Videobilder zweier Videokameras 1 und 2 digital aufgezeichnet. Von der Videokamera 1 wird 1 Bild pro Sekunde au gezeichnet, wogegen von der Videokamera 2 pro Sekunde 2 Bilder aufgezeichnet werden. Bei diesem Beispiel wird also entsprechend der Figur 1 ab 9:00,00 Uhr in jeder Sekunde ein Bild der Kamera 1 aufgezeichnet, also nacheinander die Bilder 1.1, 1.2, 1.3, 1.4 etc.. Dagegen werden in diesem Beispiel von der Kamera 2 ab 9:00,00 Uhr in jeder Sekunde zwei Bilder aufgezeichnet, also nacheinander die Bilder 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8 etc.. Wie die Figur 3 zeigt, startet gemäß dem Verfahren nach der Er- findung für dieses Beispiel die Wiedergabe der Bilder der beiden Kameras 1 und 2 zum gleichen Zeitpunkt mit den Videobildern für 9:00,00 Uhr. Hierbei folgen im ersten Wiedergabe- fenster des Bildschirms, das für die Darstellung der Videobilder der Kamera 1 zuständig ist, nacheinander im Sekundenabstand die Videobilder 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 etc. der Kamera 1, welche im Ausführungsbeispiel die "Master"-Kamera bildet. Im zweiten Wiedergabefenster des Bildschirms, das für die Darstellung der Videobilder der Kamera 2 zuständig ist, folgen ebenfalls im Sekundenabstand die Videobilder 2.1, 2.3, 2.5, 2.7 etc.. Aus der Figur 3 ist erkennbar, daß ein fortlaufender Vergleich der Uhrzeit der aufgezeichneten Bilder der Kamera 2 mit der Uhrzeit des jeweils aktuellen Bildes der "Master"-Kamera 1 durchgeführt wird und stets das der Aufzeichnungszeit der "Master"-Kamera 1 zeitlich am nächsten liegende Videobild der Kamera 2 zur Wiedergabe ausgewählt und im Videofenster der Kamera 2 dargestellt wird.. Der "Refresh" der Videobilder der Kamera 2 erfolgt also unter im wesentlichen zeitsynchroner Steuerung. Ein störender Zeitversatz der wiedergegebenen Videobilder der Kameras 1 und 2 ist bei Anwendung des Verfahrens nach der Erfindung aufgrund der beschriebenen "Time Lock"-Funktion zwischen den wiedergegebenen Bildern der beiden Kameras 1 und 2 nicht mehr vorhanden.FIG. 3 relates to the two-camera recording example according to FIG. 1. The video images of two video cameras 1 and 2 are then recorded digitally. Video camera 1 records 1 image per second, while video camera 2 records 2 images per second. In this example, according to FIG. 1, an image from camera 1 is recorded every second from 9:00 a.m., that is to say images 1.1, 1.2, 1.3, 1.4 etc. one after the other. In contrast, in this example camera 2 is removed 9:00 a.m. two images recorded every second, that is to say images 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8 etc. one after the other. As FIG. 3 shows, the method according to the invention starts for this example, the playback of the images of the two cameras 1 and 2 at the same time with the video images for 9:00 a.m. Here follow in the first playback Window of the screen, which is responsible for the display of the video images of the camera 1, the video images 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 etc. of the camera 1, which in the exemplary embodiment forms the "master" camera, one after the other. In the second display window of the screen, which is responsible for the display of the video images of the camera 2, the video images 2.1, 2.3, 2.5, 2.7, etc. also follow every second. From FIG. 3 it can be seen that a continuous comparison of the time of the recorded images the camera 2 is carried out with the time of the current image of the "master" camera 1 and the video image of the camera 2 closest in time to the recording time of the "master" camera 1 is always selected for playback and is displayed in the video window of the camera 2 .. The "refresh" of the video images of the camera 2 thus takes place under essentially time-synchronous control. A disturbing time offset of the reproduced video images of cameras 1 and 2 is no longer present when the method according to the invention is used due to the described "time lock" function between the reproduced images of the two cameras 1 and 2.
In der Figur 4 ist ein Blockschaltbild einer Schaltung zur Durchführung des Verfahrens nach der Erfindung dargestellt. Ein Raumbereich 3, in dem Vorgänge aus verschiedenen Perspek- tiven überwacht werden sollen, wird von zwei Videokameras 1 und 2 überwacht . Die von den beiden Videokameras 1 und 2 aufgenommenen Bilder werden digital in einer einzigen Videobild- AufZeichnungseinrichtung 4, kurz Recorder genannt, parallel aufgezeichnet. Die im Recorder 4 aufgezeichneten Bilder der beiden Kameras 1 und 2 werden in zwei Videofenstern 5 und 6 eines Bildschirms 7 getrennt und parallel dargestellt, wobei das Videofenster 5 den Bildern der Kamera 1 und das Videofenster 6 den Bildern der Kamera 2 zugeordnet ist. Die Videobilder der beiden Kameras 1 und 2 werden mit unterschiedlichen AufZeichnungsraten im Recorder 4 aufgezeichnet, also wie imFIG. 4 shows a block diagram of a circuit for carrying out the method according to the invention. A room area 3, in which processes are to be monitored from different perspectives, is monitored by two video cameras 1 and 2. The images recorded by the two video cameras 1 and 2 are digitally recorded in parallel in a single video image recording device 4, called a recorder for short. The images of the two cameras 1 and 2 recorded in the recorder 4 are separated and shown in parallel in two video windows 5 and 6 of a screen 7, the video window 5 being associated with the images from the camera 1 and the video window 6 with the images from the camera 2. The video images of the two cameras 1 and 2 are recorded with different recording rates in the recorder 4, that is as in
Beispiel nach der Figur 1 z.B. mit 1 Bild pro Sekunde für die Kamera 1 und mit 2 Bildern pro Sekunde für die Kamera 2. Eine einen Algorithmus ausführende Vergleichs- und Auswahleinrichtung 8 vergleicht während der Abfrage der aufgezeichneten Bilder aus dem Recorder 4 zu den beiden Kameras 1 und 2 jederzeit die Uhrzeit des aktuellen Bildes im Videofenster 7 der Kamera 1 mit den Uhrzeiten der im Recorder gespeicherten ' Bilder der Kamera 2. Dabei bildet die Kamera 1 die sogenannte "Master"-Kamera. Im folgenden wählt die Vergleichs- und Auswahleinrichtung 8 fortlaufend das der Masterzeit zeitlich am nächsten liegende, im Recorder 4 aufgezeichnete Bild der Kaera 2 zur Wiedergabe aus und veranlaßt somit dessen Darstellung im Videofenster 6, das der Kamera 2 zugeordnet ist. In den beiden Videofenstern 5 und 6 des Bildschirms 7 gelangen somit stets solche Bilder der Kameras 1 bzw. 2 zur Darstellung, die im wesentlichen zur gleichen Zeit aufgezeichnet wurden und somit zeitsynchron sind. Example according to FIG. 1, for example with 1 frame per second for camera 1 and with 2 frames per second for camera 2. One an algorithm-executing comparison and selection device 8 compares the time of the current image in the video window 7 of the camera 1 with the times of the ' images of the camera 2 stored in the recorder at any time during the query of the recorded images from the recorder 4 to the two cameras 1 and 2 The camera 1 forms the so-called "master" camera. In the following, the comparison and selection device 8 continuously selects the image of the Kaera 2 that is closest in time to the master time and recorded in the recorder 4 for playback and thus causes it to be displayed in the video window 6 that is assigned to the camera 2. In the two video windows 5 and 6 of the screen 7, images of the cameras 1 and 2 are therefore always shown which were recorded at essentially the same time and are therefore time-synchronous.

Claims

Patentansprüche claims
1. Verfahren zur gleichzeitig ablaufenden Wiedergabe von parallel in einer Videobild-AufZeichnungseinrichtung di- gital gespeicherten Videobildern zweier oder mehr verschiedener Videokameras mit unterschiedlichen Aufzeichnungsraten in den einzelnen Videokameras jeweils zugeordneten Bildschirmfeldern,1. A method for the simultaneous playback of video images digitally stored in parallel in a video image recording device of two or more different video cameras with different recording rates in the screen fields respectively assigned to the individual video cameras,
dadurch gekennzeichnet,characterized,
daß eine der Videokameras als "Master"-Kamera zur zeitlichen Bezugnahme ausgewählt wird, daß während des Abrufens der gespeicherten Videobilder der verschiedenen vi- deoka eras jederzeit die Uhrzeit des aktuell wiedergegebenen Videobildes der "Master"-Kamera mit den Uhrzeiten der gespeicherten Videobilder aller anderen Videokameras verglichen wird und daß stets das der Uhrzeit des Videobildes der "Master"-Kamera zeitlich am nächsten liegend gespeicherte Videobild der anderen Videokameras zur Wiedergabe im der jeweiligen Videokamera zugeordneten Bildschirmfeld ausgewählt wird.that one of the video cameras is selected as a "master" camera for time reference, that while the stored video images of the various video cameras are being called up, the time of the currently reproduced video image of the "master" camera with the times of the stored video images of all others at any time Video cameras are compared and that the video image of the other video cameras stored closest to the time of the video image of the "master" camera is always selected for display in the screen field assigned to the respective video camera.
2. Verfahren nach Anspruch 1,2. The method according to claim 1,
dadurch gekennzeichnet,characterized,
daß die Videobilder der verschiedenen Videokameras auf einem einzigen Bildschirm in mehreren Videofenstern par- allel dargestellt werden.that the video images of the various video cameras are displayed in parallel in several video windows on a single screen.
3. Verfahren nach Anspruch 1 oder 2,3. The method according to claim 1 or 2,
gekennzeichnet durchmarked by
die Verwendung in einem Überwachungssystem, bei dem ein Raum oder ein Raumbereich mit Hilfe der in unterschied- liehen Positionen angeordneten Videokameras aus verschiedenen Perspektiven beobachtet wird. use in a surveillance system in which a room or a room area is Positioned video cameras are observed from different perspectives.
PCT/EP2000/007816 1999-08-31 2000-08-09 Method for the simultaneous reproduction of digitally stored video images from two or more different video cameras WO2001017241A1 (en)

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DE19941321.5 1999-08-31
DE1999141321 DE19941321C2 (en) 1999-08-31 1999-08-31 Process for the simultaneous playback of digitally stored video images from two or more different video cameras

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DE102008023501B4 (en) * 2008-05-09 2011-04-14 Visumotion Gmbh Method and arrangement for the synchronous recording of at least two video data streams of different formats

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0655869A2 (en) * 1993-11-29 1995-05-31 Canon Kabushiki Kaisha Stereoscopic image processing apparatus
US5652822A (en) * 1993-03-04 1997-07-29 Pioneer Electronic Corporation Video signal recording and reproducing apparatus
US5724475A (en) * 1995-05-18 1998-03-03 Kirsten; Jeff P. Compressed digital video reload and playback system
FR2757729A1 (en) * 1996-12-25 1998-06-26 Ando Electric Signal recording and reproduction device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5652822A (en) * 1993-03-04 1997-07-29 Pioneer Electronic Corporation Video signal recording and reproducing apparatus
EP0655869A2 (en) * 1993-11-29 1995-05-31 Canon Kabushiki Kaisha Stereoscopic image processing apparatus
US5724475A (en) * 1995-05-18 1998-03-03 Kirsten; Jeff P. Compressed digital video reload and playback system
FR2757729A1 (en) * 1996-12-25 1998-06-26 Ando Electric Signal recording and reproduction device

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