AU7408500A - 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
AU7408500A
AU7408500A AU74085/00A AU7408500A AU7408500A AU 7408500 A AU7408500 A AU 7408500A AU 74085/00 A AU74085/00 A AU 74085/00A AU 7408500 A AU7408500 A AU 7408500A AU 7408500 A AU7408500 A AU 7408500A
Authority
AU
Australia
Prior art keywords
video
pictures
camera
cameras
different
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.)
Abandoned
Application number
AU74085/00A
Inventor
Matthias G. Doring
Markus Muller
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.)
Geutebruck & Co KG GmbH
Original Assignee
GEUTEBRUCK GmbH AND 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 GEUTEBRUCK GmbH AND CO KG filed Critical GEUTEBRUCK GmbH AND CO KG
Publication of AU7408500A publication Critical patent/AU7408500A/en
Abandoned legal-status Critical Current

Links

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

Description

WO 01/17241 PCT/EPOO/07816 Method for the simultaneous reproduction of digitally stored video pictures from two or more different video cameras 5 The invention relates to a method for the simultaneous reproduction of video pictures - digitally stored in parallel in a video picture recording device - from two or more different video cameras having different recording rates in screen fields respectively assigned 10 to the individual video cameras. In connection with digital video picture recording, it is known to store the pictures from different video cameras in parallel in the same video picture recording 15 device ("video recorder"). Usually, different requirements are made of each of said video cameras. Therefore, they are often recorded at a different recording rate (pictures/second) . During the reproduction of these pictures on a screen, it is 20 possible to display a plurality of video windows in parallel in order to follow a specific process from the different camera perspectives. In this case, in a conventional manner, a new video picture is always displayed alternately in the individual video windows 25 ("refresh"). If the video pictures from the individual video cameras have been recorded at different recording rates, then an increasing temporal offset between the pictures assigned to the individual cameras is discernible during the parallel reproduction on the 30 screen. An example of the above-acknowledged prior art of digital picture recording using different cameras is explained below with reference to two figures, in which 35 example the video pictures from two video cameras 1 and 2 are recorded digitally. The video camera 1 records 1 picture per second, whereas the video camera 2 records 2 pictures per second. In this example, then, in WO 01/17241 - 2 - PCT/EPOO/07816 accordance with figure 1, starting at the time 9:00.00, a picture from the camera 1 is recorded every second, that is to say in succession the pictures 1.1, 1.2, 1.3, 1.4, etc. By contrast, in this example, starting 5 at the time 9:00.00, the camera 2 records two pictures every second, that is to say in succession the pictures 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, etc. As shown by figure 2, the reproduction of the pictures 10 from the two cameras 1 and 2 starts at the same instant as the video pictures for the time 9:00.00. In this case, in the first reproduction window of the screen, which is responsible for displaying the video pictures from the camera 1, the video pictures 1.1, 1.2, 1.3, 15 1.4, 1.5, 1.6, etc. from the camera 1 follow one another at intervals of 1 second. In the second reproduction window of the screen which is responsible for displaying the video pictures from the camera 2, the video pictures 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, etc. 20 likewise follow at intervals of 1 second. Figure 2 reveals that as a result of the different recording rasters in the case of alternate "refresh" of the two reproduction windows during the display, the camera 1, after six pictures, has already advanced three seconds 25 further than the camera 2. Thus, temporally corresponding pictures are then no longer displayed in the two reproduction windows of the screen. Thus, the process observed by the two cameras 1 and 2 can no longer be viewed time-synchronously and be assessed 30 accordingly. The invention is based on the object of providing a method for the time-synchronous reproduction of digitally stored video pictures from video cameras 35 having different recording rates, so that it is ensured at any given moment that all screen-displayed video pictures display a viewed process at the same recording instant.
WO 01/17241 - 3 - PCT/EPOO/07816 According to the invention, which relates to a method of the type mentioned in the introduction, this object is achieved by virtue of the fact that one of the video 5 cameras is selected as "master" camera for temporal reference, that, during the retrieval of the stored video pictures from the different video cameras, at any given moment the time of the currently reproduced video picture from the "master" camera is compared with the 10 times of the stored video pictures from all the other video cameras, and that the video picture from the other video cameras which is stored such that it is temporally closest to the time of the video picture from the "master" camera is selected for reproduction 15 in the screen field assigned to the respective video camera. The method according to the invention provides a "time lock" function which makes it possible to synchronize all reproduced pictures from the different video cameras with the reproduced picture from a 20 selected video camera, namely the so-called "master" camera. To that end, during the interrogation of the recorded pictures with respect to the different video cameras, the time of the current picture in the video window of the "master" camera is always compared with 25 the times of the stored pictures from all the other video cameras that are to be displayed in a video window. Afterward, the video picture which is temporally closest to the "master" camera time is always selected for display and displayed in the video 30 window of the associated video camera. Thus, unlike in the case of the known multi-camera reproduction methods, the "refresh" is not effected cyclically, rather it is controlled time-synchronously. In the realization of this method, in particular in the 35 implementation of the time comparison between the pictures from the different cameras, it is also possible, in an advantageous manner, to have recourse WO 01/17241 - 4 - PCT/EPOO/07816 to software which can implement the comparison and selection algorithm. Consequently, the method according to the invention 5 ensures at any given moment that all displayed video pictures display a viewed process at essentially the same recording instant. In an advantageous manner, the video pictures from the 10 different video cameras are displayed in parallel in a plurality of video windows on a single screen. The method according to the invention can be used in a particularly advantageous manner in the context of a 15 surveillance system in which a room or room region is observed from different perspectives with the aid of the video cameras arranged in different positions. The invention will be explained below with reference to 20 drawings, in which: figure 1 shows, in a time scheme, the already explained example of recording using two video cameras, 25 figure 2 shows, in a time scheme for the same two-camera example, the reproduction of the pictures from these two cameras which proceeds in accordance with the prior art, 30 figure 3 shows, in a time scheme for the same two-camera example, the reproduction of the pictures from these two cameras which proceeds time-synchronously in accordance with the method according to the invention, and 35 figure 4 shows a block diagram scheme for the implementation of the method according to the invention.
WO 01/17241 - 5 - PCT/EPOO/07816 Figure 3 relates to the two-camera recording example according to figure 1. Accordingly, the video pictures from two video cameras 1 and 2 are recorded digitally. 5 The video camera 1 records 1 picture per second, whereas the video camera 2 records 2 pictures per second. In this example, then, in accordance with figure 1, starting at the time 9:00.00, a picture from the camera 1 is recorded every second, that is to say 10 in succession the pictures 1.1, 1.2, 1.3, 1.4, etc. By contrast, in this example, starting at the time 9:00.00, the camera 2 records two pictures every second, that is to say in succession the pictures 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, etc. As shown by 15 figure 3, in accordance with the method according to the invention for this example, the reproduction of the pictures from the two cameras 1 and 2 starts at the same instant as the video pictures for the time 9:00.00. In this case, in the first reproduction window 20 of the screen, which is responsible for displaying the video pictures from the camera 1, the video pictures 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, etc. from the camera 1 follow one another at intervals of 1 second, which forms the "master" camera in the exemplary embodiment. 25 In the second reproduction window of the screen which is responsible for displaying the video pictures from the camera 2, the video pictures 2.1, 2.3, 2.5, 2.7, etc. likewise follow at intervals of 1 second. Figure 3 reveals that a continuous comparison of the time of the 30 recorded pictures from the camera 2 with the time of the respectively current picture from the "master" camera 1 is carried out and the video picture from the camera 2 which is temporally closest to the recording time of the "master" camera 1 is always selected for 35 reproduction and is displayed in the video window of the camera 2. The "refresh" of the video pictures from the camera 2 is thus effected under essentially time-synchronous control. When employing the method WO 01/17241 - 6 - PCT/EPOO/07816 according to the invention, a disturbing temporal offset between the reproduced video pictures from the cameras 1 and 2 is no longer present on account of the above-described "time lock" function between the 5 reproduced pictures from the two cameras 1 and 2. Figure 4 illustrates a block diagram of a circuit for carrying out the method according to the invention. A room region 3, in which processes are to be monitored 10 from different perspectives, is monitored by two video cameras 1 and 2. The pictures recorded by the two video cameras 1 and 2 are digitally recorded in parallel in a single video picture recording device 4, called recorder for short. The pictures from the two cameras 1 15 and 2 which are recorded in the recorder 4 are separated and displayed in parallel in two video windows 5 and 6 of a screen 7, the video window 5 being assigned to the pictures from the camera 1 and the video window 6 being assigned to the pictures from the 20 camera 2. The video pictures from the two cameras 1 and 2 are recorded at different recording rates in the recorder 4, that is to say, as in the example according to figure 1, e.g. at 1 picture per second for the camera 1 and at 2 pictures per second for the camera 2. 25 During the interrogation of the recorded pictures from the recorder 4 with respect to the two cameras 1 and 2, a comparison and selection device 8, which executes an algorithm, compares at any given moment the time of the current picture in the video window 7 of the camera 1 30 with the times of the pictures from the camera 2 which are stored in the recorder. In this case, the camera 1 forms the so-called "master" camera. Afterward, the comparison and selection device 8 continually selects for reproduction that picture from the camera 2 which 35 is temporally closest to the master time and is recorded in the recorder 4, and thus causes said picture to be displayed in the video window 6 assigned to the camera 2. Consequently, the two video windows 5 WO 01/17241 - 7 - PCT/EPOO/07816 and 6 of the screen 7 always display those pictures from the cameras 1 and 2, respectively, which were recorded essentially at the same time and are thus time-synchronous.

Claims (3)

1. A method for the simultaneous reproduction of video pictures - digitally stored in parallel in a 5 video picture recording device - from two or more different video cameras having different recording rates in screen fields respectively assigned to the individual video cameras, characterized 10 in that one of the video cameras is selected as "master" camera for temporal reference, in that, during the retrieval of the stored video pictures from the different video cameras, at any given moment the time of the currently reproduced video 15 picture from the "master" camera is compared with the times of the stored video pictures from all the other video cameras, and in that the video picture from the other video cameras which is stored such that it is temporally closest to the 20 time of the video picture from the "master" camera is selected for reproduction in the screen field assigned to the respective video camera.
2. The method as claimed in claim 1, 25 characterized in that the video pictures from the different video cameras are displayed in parallel in a plurality of video windows on a single screen. 30
3. The method as claimed in claim 1 or 2, characterized by the use in a surveillance system in which a room or room region is observed from different perspectives with the aid of the video cameras 35 arranged in different positions.
AU74085/00A 1999-08-31 2000-08-09 Method for the simultaneous reproduction of digitally stored video images from two or more different video cameras Abandoned AU7408500A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19941321 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
PCT/EP2000/007816 WO2001017241A1 (en) 1999-08-31 2000-08-09 Method for the simultaneous reproduction of digitally stored video images from two or more different video cameras

Publications (1)

Publication Number Publication Date
AU7408500A true AU7408500A (en) 2001-03-26

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ID=7920224

Family Applications (1)

Application Number Title Priority Date Filing Date
AU74085/00A Abandoned AU7408500A (en) 1999-08-31 2000-08-09 Method for the simultaneous reproduction of digitally stored video images from two or more different video cameras

Country Status (4)

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AU (1) AU7408500A (en)
DE (1) DE19941321C2 (en)
PL (1) PL353458A1 (en)
WO (1) WO2001017241A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06261274A (en) * 1993-03-04 1994-09-16 Pioneer Electron Corp Video signal recording/reproducing device
US5627582A (en) * 1993-11-29 1997-05-06 Canon Kabushiki Kaisha Stereoscopic compression processing with added phase reference
US5724475A (en) * 1995-05-18 1998-03-03 Kirsten; Jeff P. Compressed digital video reload and playback system
JPH10185626A (en) * 1996-12-25 1998-07-14 Ando Electric Co Ltd Signal recording regenerating device

Also Published As

Publication number Publication date
PL353458A1 (en) 2003-11-17
WO2001017241A1 (en) 2001-03-08
DE19941321A1 (en) 2001-03-08
DE19941321C2 (en) 2003-12-04

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Legal Events

Date Code Title Description
MK6 Application lapsed section 142(2)(f)/reg. 8.3(3) - pct applic. not entering national phase
TH Corrigenda

Free format text: IN VOL 15, NO 25, PAGE(S) 5185-5188 UNDER THE HEADING APPLICATIONS LAPSED, REFUSED OR WITHDRAWN PLEASE DELETE ALL REFERENCE TO APPLICATION NO. 64874/00, 67263/00, 67276/00, 72729/00, 73914/00, 74085/00, 74690/00, 76410/00, 76429/00, 77702/00, 77704/00, 10176/01 AND 12669/01

MK1 Application lapsed section 142(2)(a) - no request for examination in relevant period