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
  • G08B13/19602—Image analysis to detect motion of the intruder, e.g. by frame subtraction
• • 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
  • G08B13/19613—Recognition of a predetermined image pattern or behaviour pattern indicating theft or intrusion
• • 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

Definitions

• the invention relates to a television monitoring system, consisting of at least one television camera, a processing device and at least one monitor for reproducing the images taken by the television camera, the processing device being an electronic one
• Motion detector is formed, electronically monitors the recorded images and generates an alarm message when the image changes.
• DE-PS 3214 254 describes a method for detecting movements in video camera images, in which certain parts of the image are marked in a given image. These parts of the image are used to form the average brightness value, which is compared with the subsequent images over a longer period of time in order to be able to recognize a movement on the image in this way.
• the object of the invention is to design a television monitoring system such that the person watching the monitor is informed quickly and particularly clearly of the new situation on the object to be monitored.
• This object is achieved in that the processing device has a memory with the image information of a multiplicity of patterns, and in the event of an alarm message being compared by a comparison device, that part of the image taken with all the patterns in the pattern memory in which the change takes place ⁇ found that, if a pattern matches, its image information is read from the pattern memory, transferred to the monitor and used there to display the pattern in question.
• objects in question for example impact drill, pistol, hammer, knife, etc.
• This object is also achieved in that a plurality of television cameras are connected to the processing device, that the image information recorded at regular time intervals is stored in a dedicated image memory in each case, and that cyclical partial information from all the images is stored cyclically read out and transmitted over a narrow-band transmission line to a common monitor with intermediate memory or to the respective monitor permanently assigned to the television camera in question, with an individual intermediate memory, so that the processing device has a memory with the image information of one
• a large number of patterns has that, in the event of an alarm message being sent by a comparison device, that part of the image of the television camera in question is combined with all the patterns in the memory.
• a common transmission line is sufficient for the transmission of the image information, preferably in compressed form, even if the partial information is transmitted in an interleaved manner from the image memories.
• the transmission line is used exclusively for the transmission of the image information of the television camera which recorded the movement.
• Fig.l the block diagram of the processing device with the connected television cameras
• FIG. 2 shows the block diagram for the treatment of the image information on the monitor side
• FIG. 3 Scheme for dividing a television picture into partial information.
• a plurality of television cameras F1 to Fn are connected to the processing device VE shown in FIG. 1 and are permanently set to one or more objects to be monitored.
• the high-resolution image signals generated by the television cameras are simultaneously fed to 2 image converters BW 1 and BW 2.
• the image converter BW 1 the image signals are converted into those for a low-resolution image display, but the image display still permits unambiguous identification of the object to be monitored.
• the image converter BW 2 is used to convert the image signals into those for a higher-resolution display, which, however, is lower than that of those recorded by the television programs F.
• the image information generated by the image converter BW 1 is stored in an image memory BSA and the image information of the image converter BW 2 is stored in an image memory BSB, specifically the information of an image for a predetermined time.
• the contents of the image memories BSA are read out cyclically and transmitted to the opposite side via the switching device UM and via the transmission line L. If the transmission line L has a transmission speed of 64 kb / s, for example, and partial information BT (see FIG. 3) of an image is transmitted with each frame (per second), the memory contents of all the image memories BSA can be transmitted after 16 s, for example. if a specific section is reserved in each frame for each image memory BSA.
• each frame for example of a length of 64 kbit, into subframes, each subframe being permanently assigned to an image memory BSA and serving to transmit partial information BT.
• the memory content of the image memories BSA is also fed to a motion detection device BE.
• This also has image memories, not shown, in which the previously recorded image has been stored. By comparing this image with the surgeon ⁇ the moment taken image is a movement clearly indicates when occurring between two images a difference '.
• the motion detection device BE generates a signal for the control device ST which points to the television camera F which has taken the picture in which a motion has been detected.
• the motion detection device BE generates a signal for the control device ST for a comparison device V, which also informs the latter about the television camera F in question and also about the part of the image in which the movement was detected.
• the comparison device V retrieves the information of the relevant image part from the high-resolution image memory BSB and compares it with the patterns of a pattern memory MS.
• the pattern memory MS contains the patterns in the form of various views of a large number of objects (for example impact drill, pistol, hammer, measuring device, etc.) in the form of corresponding image information.
• the control device ST receives a corresponding signal from the latter and then causes the switching device UM to read the pattern determined during the comparison from the pattern memory and to transmit it to the transmission line L. It is also conceivable to additionally store a symbol for the object in question in the sample memory MS and to transmit this symbol to the remote station, for example in a low-resolution representation, if the identification is unambiguous via the transmission line L.
• the remote station can now either send a corresponding request signal to the processing device VE or further automatically after a certain time after the transmission of the information from the sample memory MS by the control device ST, the switching device UM to read out the image memory BSB with the high-resolution image information from the television camera concerned, in which case the Sprinttra ⁇ total transfer capacity of the transmission line L for 'the Koch ⁇ transmission of the memory contents is required. No image information is transmitted for the other television cameras during this time.
• Alarm case i.e. with a corresponding message from the “motion detection device BE, a signal is sent to the remote station to trigger an optical and / or acoustic alarm signal, at the instigation of the control device ST, and in addition, if necessary, an indication is given of the television camera F in question.
• the transmission line L ends in the remote station (see FIG. 2) in a distribution device VT, which distributes the interleaved transmitted partial information of the images to the associated buffer store ZS, and controls the storage there at the location provided for this purpose.
• the buffers are cyclically overwritten with new information and are read out cyclically, the memory content being used for display on the respective monitor M.
• the image information contained in the image memories BSA is nested one after the other via the transmission line L to the intermediate memories ZS.
• the image information of the determined pattern is first transmitted from the pattern memory MS to the monitor M assigned to the television camera F in question, and then the transmission line L for the Transfer of the image information from the image memory BS used, which is assigned to that television camera F which recorded the movement.
• the content of the remaining buffer stores ZS is not updated, so that the previous image is still shown on the monitors M.
• the processing device VE In the event of an alarm, the processing device VE generates an alarm signal for the remote station, which results in an optical and / or acoustic alarm display.
• the corresponding alarm signals can be transmitted either via the transmission line L or via another transmission medium.
• the alarm display is triggered by an alarm generator AG, the person observing the monitors M being alerted by an acoustic signal and then the relevant monitor being optically identified. If there is only one common monitor M, an acoustic signal is sufficient.
• the sample memory MS (FIG. 1) contains a large number of representations for each object in question, not only from different angles, but also in different sizes. Depending on the amount of data to be processed, either a successive comparison of the individual patterns or a simultaneous comparison with several patterns is now conceivable. If no object can be clearly identified within the scope of the movement detected, the processes proceed in the manner described without the transmission of a pattern or a symbol.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Computer Vision & Pattern Recognition (AREA)
• Closed-Circuit Television Systems (AREA)
• Burglar Alarm Systems (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6428661

Family Applications (1)

Country Status (4)

Families Citing this family (17)

Citations (3)

Family Cites Families (3)

• 1991
  • 1991-04-02 DE DE4110649A patent/DE4110649A1/de active Granted
• 1992
  • 1992-03-26 EP EP92907189A patent/EP0578671B1/de not_active Expired - Lifetime
  • 1992-03-26 DE DE59207502T patent/DE59207502D1/de not_active Expired - Lifetime
  • 1992-03-26 JP JP50681192A patent/JP3181290B2/ja not_active Expired - Fee Related
  • 1992-03-26 WO PCT/DE1992/000253 patent/WO1992017865A1/de active IP Right Grant

Patent Citations (3)

Non-Patent Citations (1)

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