EP0017821A1 - Système et circuit pour l'exploitation d'images de télévision stationnaires, constituées par des lignes et des trames, en vue de la détection d'un changement de luminosité causé par le mouvement d'un objet - Google Patents

Système et circuit pour l'exploitation d'images de télévision stationnaires, constituées par des lignes et des trames, en vue de la détection d'un changement de luminosité causé par le mouvement d'un objet Download PDF

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Publication number
EP0017821A1
EP0017821A1 EP80101616A EP80101616A EP0017821A1 EP 0017821 A1 EP0017821 A1 EP 0017821A1 EP 80101616 A EP80101616 A EP 80101616A EP 80101616 A EP80101616 A EP 80101616A EP 0017821 A1 EP0017821 A1 EP 0017821A1
Authority
EP
European Patent Office
Prior art keywords
stage
output
input
video
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP80101616A
Other languages
German (de)
English (en)
Other versions
EP0017821B1 (fr
Inventor
Sandor Dipl.-Ing. Waldmann
Lászlo Dipl.-Electroing. Veisz
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.)
Hiradastechnika Szovetkezet
Original Assignee
Hiradastechnika Szovetkezet
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.)
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Publication date
Application filed by Hiradastechnika Szovetkezet filed Critical Hiradastechnika Szovetkezet
Priority to AT80101616T priority Critical patent/ATE5834T1/de
Publication of EP0017821A1 publication Critical patent/EP0017821A1/fr
Application granted granted Critical
Publication of EP0017821B1 publication Critical patent/EP0017821B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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 SYSTEMS, e.g. PERSONAL 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
    • G08B13/19634—Electrical details of the system, e.g. component blocks for carrying out specific functions
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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
    • G08B13/19676—Temporary storage, e.g. cyclic memory, buffer storage on pre-alarm

Definitions

  • the invention relates to a method and a circuit arrangement for digitizing, storing, comparing and evaluating TV pictures for the purpose of detecting a change and movement.
  • the video average value is formed from the entire FS image or individual parts thereof, stored and, from time to time, compared with the instantaneous value like. It is well known that in the video average of a field of a given size, some movement or change in the video signal causes a change. The display of this video average value forms the reason for the motion detection. If the size of the sub-picture is increased, the change in the video average value caused by the movement of the given size decreases, or if the sub-picture is reduced, the change in the video average value increases. It follows that it is advisable to reduce the size of the checked sub-image.
  • the video signal of the non-standardized, simplified (free-running) cameras changes continuously, so the lines of the same number of successive fields can be different even with a static picture.
  • This fact requires the vertical dimension to be increased because the effect on the video average corresponding to changing a line is reduced by increasing the number of lines.
  • the search for the optimum is essential, but this is closely related to the evaluation threshold, i.e. the permissible maximum value of the video average change - without a useful change in the FS image.
  • the video average value of the entire FS picture in general, is formed analogously, the comparison with the instantaneous value being made after the analog storage.
  • Sensitivity is understood to mean a change in the observed partial image which has arisen as a result of a useful movement and which exceeds the evaluation threshold and in which an error signal is generated.
  • the FS image is broken down into vertical and horizontal strips, the video average of these fields being formed in the direction of the line deflection.
  • the video average value of the FS field is not digitized, but instead is stored in an analog manner, storage elements in a number corresponding to the number of individual images must be used.
  • the essence of the method according to the invention is that the FS image, which is broken down into horizontal and vertical strips, is scanned as vertical strips which are assigned to successive fields - corresponding to the vertical decomposition of the horizontal strips - in such a way that the digitized video average value the partial images are formed one after the other within the individual vertical stripes in the direction of the image deflection, the information is stored in the memory until it is rewritten, and during this period the memory content is compared once or more times with the instantaneous value, after which the difference - their Level exceeds the evaluation threshold - is displayed.
  • the checking of a drawing file takes place per T basic cycle time.
  • the memory content is rewritten after an F * N x T observation cycle, where N denotes the number of comparison cycles.
  • the advantage of the method lies in the fact that the process of image processing is continuous, in order and takes place, whereby the processing of the information can be avoided in several steps.
  • the time available for digitization, memory control and comparison is an order of magnitude longer than with the scanning method carried out in the line direction, so the method can be implemented using simple and inexpensive means.
  • the last line of each horizontal stripe, or the line blank belonging to the last line, is called the operation time; thus, during a field in a vertical strip, the video average value of a field created between two successive operating times is formed, in order, in the direction of the image deflection.
  • the same times (1 H or the line blanking) are available for converting the average values formed in this way into digital four-bit information and for processing.
  • the four bits do not allow the differentiation of 16 gradation levels, but rather a multiplication thereof, since the observation of the bits is sufficient from the four binary values of a five or six-digit number of bits.
  • the probability that the change in the digitized average value of a partial image corresponds to exactly 16 gradation levels or a multiple thereof is very small.
  • Digitization takes place in the first half of the operation time, writing to memory or reading and evaluation of the digital information takes place in the second half.
  • the time required to save an entire FS image is equal to the product of the number of vertical stripes and the field time. Of course, this is required for reading The time is exactly as long. As a result of the interline scanning, a cycle designed in this way must contain even fields.
  • the rewriting of the memory depends on the application. In the case of a motion detector, it seems expedient to switch on a rewrite cycle (periodically) only after several read (comparison) cycles, while in the case of a non-periodic function the memory can be rewritten due to the effect of a signal output for deviation or movement.
  • the read cycle the digitized average value of the current field is compared with the content of the corresponding cell in the memory. If there is a deviation, an error signal is generated.
  • the advantage of the solution is that the process of image processing takes place in sequence and continuously, whereby the processing of the information in several steps can be avoided.
  • the input video signal is received by the input unit 1, the adder 2 mixes the window signal generated by the window-forming stage 6 into the video signal.
  • the appropriate video level and the output impedance is achieved by means of the output unit 3.
  • the input unit 1, the adder 2 and the output unit 3 together form a video channel.
  • One of the intermediate outputs of the video channel connects to switch S of synchronous isolator 4; the synchronous isolator 4 generates the composite synchronous signals according to the position of the switch S from the video signal or from an external synchronous signal mixture.
  • the control unit 5 generates the vertical stripes belonging to the fields from the image and line synchronizing signal obtained from the synchronous separation stage 4, as well as the gate signals of the A / D converter and buffer store 7, furthermore the operation time T M , the time T D for the digitization, the memory release time T E , and the comparison time T H (FIG. 3).
  • the control unit 5 performs the addressing of the memory and generates the R / W read-write control signal (FIG. 4).
  • the window-forming stage 6 is assigned the task that Determine the intended area to be observed from the vertical and horizontal stripes generated by the control unit 5.
  • the window-forming stage 6 also generates the window signal provided with the blanking signal mixture for the adder stage 2.
  • the A / D converter and buffer 7 based on the "dual slope" principle is assigned the task of carrying out the analog integration of the individual parts of the video signal produced between two successive operating times of the columns, in the sense of the figure 3 convert the analog signal into digital information during the time T D for digitization and store it during the operation time T M.
  • the memory 8 stores the digital information supplied by the A / D converter and buffer memory 7.
  • the digital information retrieved, stored and received by the A / D converter and buffer 7 is compared in the comparing unit 9 which forms the error signal; here too the evaluation is ensured; in the event of a deviation exceeding the threshold value, an indication is given at the output.
  • the error signal formation takes place during the comparison time T H ; in the event of a deviation, the error signal is stored until it is deleted.
  • the FS image was broken down into thirteen vertical and thirteen horizontal stripes, so the number of sub-images was one hundred and sixty-nine.
  • the device is suitable for processing the video signal from cameras with standardized and simplified synchronous signals, so the image decomposition described above was designed accordingly.
  • the synchronized signal is monitored by the built-in automatic, with a simplified synchronized signal that Gorät works with a simple, with a standardized synchronized signal with double sensitivity. Accordingly, the number of gradation levels distinguishable within a field is twenty or forty.
  • the double sensitivity can be selected.
  • Microswitches are provided to select the partial images to be monitored.
  • the set field is invertible, ie in this case the field in question is excluded from monitoring.
  • the fonster signal of the monitored toilet picture can be mixed in with the output video signal. It is possible to set his honor level.
  • the deletion is done either manually or automatically.
  • FIG. 1 The block shown in FIG. 1 as the control unit 5 is illustrated in more detail in the circuit arrangement shown in FIG.
  • the control stage 10 With the aid of the synchronous signal mixture obtained from the synchronous separation stage 4, the control stage 10 generates the clock pulses and gate signals of the column-forming stage 11, as well as the input signal of the field selector 12; furthermore, the control stage 10 generates the signal of the operation time t M according to FIG. 3 for the dio gap detector stage 13 and for the A / D converter and buffer store 7.
  • the control stage 10 forms the auxiliary signals of the A / D converter and buffer store 7 (for example the clamper signal t D for the digitization time and, if necessary, the clock signal);
  • the clock signal is expediently tied in phase with the line synchronizing signal.
  • the control stage 10 also generates the t E signal according to FIG. 3 for the memory 8, the addressing signals of the memory, and the R / W read and write signal according to FIG. 3 from the output signal of the field selection stage 12.
  • control stage 10 is assigned the task with the aid of the output signal of the window-forming stage 6, the signal of the comparison time t H according to FIG. 3 for the comparative unit 9 forming the error signal, and the vertical clock signal of the window-level end 6 to generate.
  • the column-forming stage 11 generates from the output signals of the control stage 10 the horizontal sequences corresponding to the vertical stripes for the column selector stage 13 and the window-forming stage 6.
  • the field selector stage 12 generates the input signals of the column selector stage 13 from the signal of the control stage 10.
  • the field selector stage 12 generates the basic cycle time T of FIG. 4 for the control stage 10.
  • the column selector stage 13 generates the gate signal of the A / D converter and buffer 7 from the signals of the column-forming stage 11, the field selector stage 12 and the control stage 10.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Studio Circuits (AREA)
  • Television Signal Processing For Recording (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Electric Cable Installation (AREA)
EP80101616A 1979-04-17 1980-03-26 Système et circuit pour l'exploitation d'images de télévision stationnaires, constituées par des lignes et des trames, en vue de la détection d'un changement de luminosité causé par le mouvement d'un objet Expired EP0017821B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80101616T ATE5834T1 (de) 1979-04-17 1980-03-26 Verfahren und schaltungsanordnung zur auswertung von aus zeilen und halbbildern bestehenden, stationaeren fernsehbildern zwecks detektierung einer helligkeitsaenderung bei bewegung eines objektes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HUHI000512 1979-04-17
HU79HI512A HU179193B (en) 1979-04-17 1979-04-17 Method and arrangement for digitizing,storing,comparising and evaulating tv pictures

Publications (2)

Publication Number Publication Date
EP0017821A1 true EP0017821A1 (fr) 1980-10-29
EP0017821B1 EP0017821B1 (fr) 1984-01-11

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EP80101616A Expired EP0017821B1 (fr) 1979-04-17 1980-03-26 Système et circuit pour l'exploitation d'images de télévision stationnaires, constituées par des lignes et des trames, en vue de la détection d'un changement de luminosité causé par le mouvement d'un objet

Country Status (4)

Country Link
EP (1) EP0017821B1 (fr)
AT (1) ATE5834T1 (fr)
DE (1) DE3066073D1 (fr)
HU (1) HU179193B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2484754A1 (fr) * 1980-05-09 1981-12-18 Hajime Industries Procede et dispositif de surveillance d'une scene par camera video
GB2147766A (en) * 1983-10-03 1985-05-15 Fuji Xerox Co Ltd Picture image file device
FR2563676A1 (fr) * 1984-04-27 1985-10-31 Licentia Gmbh Procede de detection des changements de scene dans les films et les enregistrements video et surveillance des objets au moyen de cameras video
FR2616251A1 (fr) * 1987-06-05 1988-12-09 Bertin & Cie Procede et dispositif de determination du nombre de personnes presentes dans un espace determine
EP0493718A3 (en) * 1990-12-31 1993-04-07 Goldstar Co. Ltd. System and method for automatically detecting a variation of video information
EP0805426A3 (fr) * 1996-05-03 1999-04-14 Simon Kelly Système de surveillance et procédé de fonctionnement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3543515A1 (de) * 1985-12-10 1987-06-11 Strahlen Umweltforsch Gmbh Verfahren zur messung der bewegungsweisen und konfigurationen von biologischen und nicht biologischen objekten

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2439159B1 (de) * 1974-08-14 1975-09-04 Peter 8000 Muenchen Schubert Verfahren und Schaltungsanordnung zur automatischen Überprüfung des von einer Fernsehkamera zu einem Monitor gelieferten Videosignales
DE2617112A1 (de) * 1976-04-17 1977-10-27 Bosch Gmbh Robert System zum feststellen einer bewegung im ueberwachungsbereich einer fernsehkamera

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2439159B1 (de) * 1974-08-14 1975-09-04 Peter 8000 Muenchen Schubert Verfahren und Schaltungsanordnung zur automatischen Überprüfung des von einer Fernsehkamera zu einem Monitor gelieferten Videosignales
DE2617112A1 (de) * 1976-04-17 1977-10-27 Bosch Gmbh Robert System zum feststellen einer bewegung im ueberwachungsbereich einer fernsehkamera

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2484754A1 (fr) * 1980-05-09 1981-12-18 Hajime Industries Procede et dispositif de surveillance d'une scene par camera video
GB2147766A (en) * 1983-10-03 1985-05-15 Fuji Xerox Co Ltd Picture image file device
FR2563676A1 (fr) * 1984-04-27 1985-10-31 Licentia Gmbh Procede de detection des changements de scene dans les films et les enregistrements video et surveillance des objets au moyen de cameras video
FR2616251A1 (fr) * 1987-06-05 1988-12-09 Bertin & Cie Procede et dispositif de determination du nombre de personnes presentes dans un espace determine
WO1988009978A1 (fr) * 1987-06-05 1988-12-15 Bertin & Cie Procede et dispositif de determination du nombre de personnes presentes dans un espace determine
EP0296011A1 (fr) * 1987-06-05 1988-12-21 Bertin & Cie Procédé et dispositif de détermination du nombre de personnes présentes dans un espace déterminé
EP0493718A3 (en) * 1990-12-31 1993-04-07 Goldstar Co. Ltd. System and method for automatically detecting a variation of video information
EP0805426A3 (fr) * 1996-05-03 1999-04-14 Simon Kelly Système de surveillance et procédé de fonctionnement

Also Published As

Publication number Publication date
ATE5834T1 (de) 1984-01-15
DE3066073D1 (en) 1984-02-16
HU179193B (en) 1982-09-28
EP0017821B1 (fr) 1984-01-11

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