EP0017821A1 - Process and circuit for evaluation of stationary television pictures consisting of lines and frames used for detecting a brightness variation cansed by a moving object - Google Patents

Process and circuit for evaluation of stationary television pictures consisting of lines and frames used for detecting a brightness variation cansed by a moving object 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
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Prior art keywords
stage
output
input
video
signal
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EP80101616A
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German (de)
French (fr)
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EP0017821B1 (en
Inventor
Sandor Dipl.-Ing. Waldmann
Lászlo Dipl.-Electroing. Veisz
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Hiradastechnika Szovetkezet
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Hiradastechnika Szovetkezet
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    • 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
    • G08B13/19634—Electrical details of the system, e.g. component blocks for carrying out specific functions
    • 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
    • G08B13/19676—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)
  • Electric Cable Installation (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

1. Method for evaluating of stationary TV pictures consisting of lines and half-pictures in order to detect a change in the intensity of light on the movement of an object, wherein the video-signal (Vin ) is within an A/D-transmitter (7) digitalized and intermediately stored and a mask signal synchronized to the video-signal is provided, which signal is scanning the TV picture of the TV camera on horizontal and vertical stripes for the provision of defined windows of the picture, wherein the digital video-signals are logically connected to the mask signal and are stored in a store (8) and the content of the store is for evaluation compared within a comparator (9) with a momentary value, characterized in that the picture windows are scanned in half-pictures following timely to one another within vertical stripes corresponding to the vertical decomposition of the horizontal stripes, that by means of the A/D-transmitters (7) for the picture windows within the single vertical stripes digitalized video average values following to one another are provided in the direction of the deflection of the picture, that the digitalized average video values are stored in the store (8) and are delivered to the comparator (9) and that within the comparator the momentary digital average value is compared with the preceeding stored digital average value and is as the case may be indicated as a difference, if the level of the differential value is exceeding an evaluation threshold defined within the comparator (9).

Description

Die Erfindung betrifft ein Verfahren und eine Schaltungsanordnung zur Digitalisierung, Speicherung, Vergleichung und Auswertung von TV-Bildern zwecks Detektierung einer Anderung und Bewegung.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.

Zur Anzeige einer in statischen Bildern vor sich gehenden Anderung, Bewegung wird der Video-Durchschnittswert vom ganzen FS-Bild oder Einzelteilen dessen gebildet, gespeichert und von Zeit zu Zeit mit dem Momentanwert verglichen. Es ist wohlbekannt, daß in dem Video-Durchschnittswert eines Teilbildos von gegebener Größe eine gewisse Bewegung bzw. eine Änderung des Videosignals eine Änderung hervorruft. Die Anzeige dieses Video-Durchschnittswerts bildet den Grund der Bewegungsdetektierung. Wenn die Größe des Teilbildes erhöht wird, vermindert sich die von der Bewegung gegebener Größe hervorgerufene Änderung des Video-Durchschnittswertes bzw. bei einer Verminderung des Teilbildes nimmt die Anderung des Video-Durchschnittswertes zu. Daraus folgt, daß es zweckmäßig ist, die Abmessung des geprüften Teilbildes zu verringern.In order to display a change or movement occurring in static images, 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.

Das Videosignal der nicht-standardisierten, vereinfachten (freilaufenden) Kameras ändert sich kontinuierlich, so können die Zeilen von gleicher Zahl der einander folgenden Halbbilder auch bei einem statischen Bild unterschiedlich sein. Diese Tatsache erfordert die Vergrößerung der vertikalen Abmessung, da sich die der Änderung einer Zeile entsprechende, auf den Video-Durchschnittswert ausgeübte Wirkung durch die Erhöhung der Zeilenzahl vermindert. Zur Befriedigung zweier, einander widersprechenden Forderungen ist das Suchen des Optimums unerläßlich, was jedoch in einer engen Verbindung mit der Auswertungsschwelle d.h, mit dem zulässigen Maximalwert des Video-Durchschnittswertsänderung - ohne eine nützliche Änderung in dem FS-Bild - steht.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. In order to satisfy two contradicting requirements, 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.

Bei den gegenwärtig bekannten einfache Lösungen wird der Video-Durchschnittswert des ganzen FS-Bildes, im allgemeinen, analog gebildet, wobei der Vergleich mit dem Momentanwert nach der analogen Speicherung vorgenommen wird.In the currently known simple solutions, 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.

Der Hauptnachteil dieser Lösungen besteht darin, daß obzwar das ganze FS-Bild beobachtet wird, die Empfindlichkeit infolge der erwähnten Gründe recht gering ist.The main disadvantage of these solutions is that although the entire FS image is observed, the sensitivity is quite low due to the reasons mentioned.

Bei komplizierten Lösungen werden einige, aus dem FS-Bild entommene, auf beliebige Stelle des Bildes verschiebbare Teilbilder beobachtet.In the case of complicated solutions, some partial images, which are taken from the FS image and can be moved to any position in the image, are observed.

Im allgemeinen werden bei diesen Lösungen analoge Speicherung (der Video-Durchschnittswert jedes einzelnen Teilbildes wird separat gespeichert), analoger Vergleich und analoge Fohlersignalbildung verwendet.In general, these solutions use analog storage (the average video value of each individual field is stored separately), analog comparison and analog foal signal generation.

Bei diesen Geräten ist die Empfindlichkeit schon höher, dagegen ist es nicht möglich das ganze FS-Bild zu beobachten. Unter Empfindlichkeit wird eine, infolge einer nützlichen Bewegung entstandene, die Auswertungsschwelle übertreffende Änderung des beobachteten Teilbildes verstanden, bei der ein Fehlersignal erzeugt wird.The sensitivity of these devices is already higher, but it is not possible to observe the entire FS image. 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.

Bei den am meisten entwickelten Lösungen wird das FS-Bild in vertikale und horizontale Streifen zerlegt, wobei der Video-Durchschnittswert dieser Teilbilder in der Richtung der Zeilonablenkung gebildet wird.In the most developed solutions, 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.

Die Bildung des Video-Durchschnittswerts je Teilzeile findet auf analoger Weise statt, in dem nächsten Schritt wird die Digitalisierung durchgeführt, die digitalisierten Durchschnittswerte der untereinander vorhandenen Teilzeile werden addiert und gespeichert.The formation of the video average value per sub-line takes place in an analogous manner, in the next step the digitization is carried out, the digitized average values of the sub-line present one below the other are added and stored.

Wird dagegen der Video-Durchschnittswert des FS-Teilbildes nicht digitalisiert, sondern analog gespeichert, müssen Speicherelemente in einer, der Zahl der Einzelbilder entsprechenden Zahl verwendet werden.If, on the other hand, 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.

Der Nachteil dieser Lösungen besteht darin, daß wegen der horizontalen Abtastung entweder zwei, parallel funktionierende Konverter mit je einem intermediären Element und Addierer je Spalte erforderlich sind, oder jede Teilzeile gesondert gespeichort wird, das eine große Memorienkapazität beansprucht.The disadvantage of these solutions is that because of the horizontal scanning either two, in parallel working converters with an intermediate element and adders per column are required, or each sub-line is stored separately, which requires a large memory capacity.

Auch bei diesen Lösungen wird der Vergleich der gespeicherten und momentanen Informationen analog vorgenommen,With these solutions too, the comparison of the stored and current information is carried out analogously,

Das Wesentliche des erfindungsgemäßen Verfahrens besteht darin, daß das in horizontale und vertikale Streifen zerlegte FS-Bild als vertikale, zeitlich einander folgenden Halbbildern zugeordnete Streifen - der vertikalen Zerlegung der horizontalen Streifen entsprechend - abgetastet wird, und zwar derweise, daß der digitalisierte Video-Durchschnittswert der Teilbilder innerhalb der einzelnen vertikalen Streifen in der Richtung der Bildablenkung einzeln, einander folgend gebildet wird, die Information bis zum Wiedorschreiben in dem Speicher gespeichert wird und während dieser Periode der Speicherinhalt wiederholt einmal oder mehrmal mit dem Momentanwert verglichen wird, wonach die Differenz - deren Pegel die Auswertungsschwelle überschreitet - angezeigt wird.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.

Der Zeitbedarf der Einschreibungs- bzw. Vergleichszyklen beträgt T = n x 20 msec (die Zahl der vertikalen Streifen mit der Halbbildzeit multipliziert). Die Prüfung je eines Teilbildes findet je T Basiszykluszeit statt. Der Speicherinhalt wird nach einem F * N x T Beobachtungszyklus neugeschrieben, wo N die Zahl der Vergleichungszyklen bezeichnet.The time required for the registration or comparison cycles is T = n x 20 msec (the number of vertical strips multiplied by the field time). 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.

Der Vorteil des Verfahrens liegt darin, daß der Prozeß der Bildverarbeitung kontinuierlich, reihenfolgengemäß und vor sich geht, wodurch die Verarbeitung der Informationen in mehreren Schritten vermieden werden kann. Die für die Digitalisierung, Speichersteuerung und Vergleichung zur Verfügung stehende Zeit ist um eine Größenordnung länger, als bei der, in Zeilenrichtung durchgeführten Abtastungsmethode, so kann das Verfahren mittels einfacher und billiger Mittel realisiert worden,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.

Die letzte Zeile jedes horizontalen Streifens, oder die zu der letzten Zeile gehörende Zeilenaustastung wird als Operationszeit bezeichnet; so wird während eines Halbbildes in einem vertikalen Streifen der Video-Durchschnittswert eines, zwischen zwei, einander folgenden Operationszeiten entstandenen Teilbildes, reihenfolgengemäß, in der Richtung der Bildablenkung gebildet. Zur Umwandlung der auf derweise gebildeten Durchschnittswerte in digitale Vierbit-Informationen und zur Verarbeitung stehen gleiche Zeiten (1 H oder die Zeilenaustastung) zur Verfü- gung. Besteht die Absicht die Änderung des Teilbildes anzuzeigen, so ermöglichen die vier Bits nicht die Unterscheidung von 16 Gradationspegeln, sondern des Vielfachen derselben, da die Beobachtung der Bits von den vier Bsinsten Stellwerten einer fßnf- oder sechsstelligen Bitzahl genügend ist. In einem FS-Bild ist nämlich die Wahrscheinlichkoit, daß die Änderung des digitalisierton Durchschnittswertes eines Teilbildes genau 16 Gradationspegeln oder dem ganzen Vielfachen derselben entspricht, recht gering.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. If the intention is to indicate the change in the field, 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. In an FS image, 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.

In der ersten Hälfte der Operationszeit findet die Digitalisierung statt, in der zweiten Hälfte erfolgt das Schreiben in den Speicher oder das Lesen und die Auswertung der digitalen Information. Der Zeitbedarf für den Spoicherungsvorgang eines ganzen FS-Bildes ist dem Produkt der Anzahl der vertikalen Streifen und der Halbbildzeit gleich. Selbstverständlich ist die zum Lesen erforderderliche Zeit genau so lang, Infolge der Zwischenzeilen-Abtastung muß ein derweise gestalteter Zyklus geradzahlige Halbbilder enthalten.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.

Das Neuschreiben des Speichers hängt von der Anwendung ab. Bei einem Bewegungsdetektor scheint es zweckmüßig erst nach mehreren Lese(Vergleichungs)zyklen einen Neuschreibezyklus (periodisch) einzuschalten, während bei einer nicht-periodischen Funktion der Speicher infolge der Wirkung eines für Abweichung oder Bewegung ausgegebenen Signalesneugeschrieben werden kann. Während des Lesezyklus wird der digitalisierte Durchschnittswert des momentanen Teilbildes mit dem Inhalt der entsprechenden Zelle des Speichers verglichen. Bei einer Abweichung wird ein Fehlersignal erzeugt.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. During 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.

Der Vorteil der Lösung besteht darin, daß der Prozeß der Bildverarbeitung in Reihenfolge und kontinuierlich stattfindet, wodurch die Verarbeitung der Informationen in mehreren Schritten vermieden worden kann.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.

Die erfindungsgemäße Schaltungsanordnung wird anhand der in den Figuren dargestellten Ausführungsbeispiele näher erläutert. Es zeigen:

  • Figur 1 das Blockschema eines Ausführungsbeispiels der erfindungsgemäßen Schaltungsanordnung,
  • Figur 2 ein noch detailliertes Blockschema der Schaltungsanordnung nach Figur 1,
  • Figur 3 den zeitlichen Zusammenhang zwischen der Operationszeit, der Zeit für die Digitalisierung, der Freigabezeit des Speichers, sowie der Vergleichungszeit,
  • Figur 4 die Reihenfolge der Schreibe- und Vergleichszyklen sowie des Steuersignal des Schreibens, Lesens des Speichers.
The circuit arrangement according to the invention is explained in more detail using the exemplary embodiments shown in the figures. Show it:
  • FIG. 1 shows the block diagram of an exemplary embodiment of the circuit arrangement according to the invention,
  • FIG. 2 shows a still detailed block diagram of the circuit arrangement according to FIG. 1,
  • FIG. 3 shows the temporal relationship between the operation time, the time for digitization, the release time of the memory, and the comparison time,
  • Figure 4 shows the order of the write and comparison cycles and the control signal of writing, reading the memory.

Das Eingangs-Videosignal wird von der Eingangseinheit 1 empfangen, die Addierstufe 2 mischt das von der fensterbildenden Stufe 6 erzeugte Fensteraignal in das Videosignal. Der geeignete Videopegel und die Ausgangsimpedanz wird mittels der Ausgangseinheit 3 erreicht. Die Eingangseinheit 1, die Addierstufe 2 und die Ausgangseinheit 3 bilden gemeinsam einen Videokanal. Einer der intermediären Ausgänge des Videokanals schließt sich über den Schalter S der Synchrontrennstufe 4 an; die Synchrontrennstufe 4 erzeugt der Stellung des Schalters S entsprechend aus dem Videosignal oder aus einem äußeren Synchronsignalgemisch die zusammengesetzten Synchronsignale. Die Steuereinheit 5 erzeugt aus dem, von der Synchrontrennstufe 4 erhaltenen Bild- und Zeilensynchronsignal die zu den Halbbildern gehörenden vertikalen Streifen, sowie die Gattersignale des A/D Wandlers und Zwischenspeichere 7, desweiteren die Operationszeit TM, die Zeit TD für die Digitalisierung, die Speicherfreigabezeit TE, und die Vergleichszeit TH (Figur 3]. Die Steuerinheit 5 führt die Adressierung des Speichers durch und erzeugt das R/W Lesen-Schreiben-Steuersignal (Figur 4). Der fensterbildenden Stufe 6 wird die Aufgabe zugeteilt, die zu beobachtende beabsichtigte Fläche aus den, von der Steuereinheit 5 erzeugten, vertikalen und horizontalen Streifen zu bestimmen. Die fensterbildende Stufe 6 erzeugt auch das mit dem Austastsignalgemisch versehene Fenstersignal für die Addierstufe 2.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.

Dem auf dem "dual slope" Prinzip beruhenden A/D Wandler und Zwischenspeicher 7 wird die Aufgabe zugeteilt die analoge Integrierung der Einzelteile, des, zwischen zwei, einander folgenden Operationszeiten der Spalten entstandenen Videosignals auszuführen, im Sinne der Figur 3 das analoge Signal während der Zeit TD für die Digitalisierung in eine digitale Information umzuwandeln und während der Operationszeit TM zu speichern.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.

Seine Gatter- und Steuersignale werden in der Steuereinheit 5 erzeugt. Während der Zeitdauer zwischen den beiden, durch die Steuereinheit 5 bestimmten Schreiben speichert der Speicher 8 die von dem A/D Wandler und Zwischenspeicher 7 gelieferte digitale Information.Its gate and control signals are generated in the control unit 5. During the period between the two writes determined by the control unit 5, the memory 8 stores the digital information supplied by the A / D converter and buffer memory 7.

Die von dem Speicher 8 abgerufenen, gespeicherten und von dem A/D Wandler und Zwischenspeicher 7 erhaltenen digitalen Informationen werden in der vergleichenden und das Fehlersignal bildenden Einheit 9 verglichen; auch hier wird die Auswertungsschwolle sichergestellt; bei einer den Schwellenwert überschreitenden Abweichung wird an dem Ausgang eine Anzeige abgegeben.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.

In den Vergleichszyklen findet die Fehlersignalbildung während der Verqleichzeit TH statt, bei einer Abweichung wird das Fehlersignal bis zur Löschung gespeichert.In the comparison cycles, 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.

Bei einem vorteilhaften Ausführungsbeispiel wurde das FS-Bild in dreizehn vertikale und dreizehn horizontale Streifen zerlegt, so betrug die Zahl der Teilbilder einhundertneunundsechzig. Das Gerät ist zur Verarbeitung des Videosignals von Kameras mit standardisierton und vereinfachten Synchronsignalen geeignet, so wurde die obenbeschriebene Bildzerlegung dementsprechend ausgestaltet. Das Synchronsignal wird von der eingebauten Automatik beobachtet, bei einem vereinfachten Synchronsignal arbeitet daß Gorät mit einer einfachen, bei einem standardisierten Synchronsignal mit doppelter Empfindlichkeit. Demnach beträgt die Zahl der innerhalb eines Teilbildes unterscheidbaren Gradationspegels zwanzig bzw. vierzig. Die doppelte Empfindlichkeit kann ausgesahaltet werden. Zur Auswahl der zu überwachen gewünschten Teilbilder sind Mikroschalter vorgesehen. Das eingestellte Feld ist invertibel, d.h. in diesem Fall ist das betreffende Feld von der Oberwachung ausgeschlossen. Das Fonstersignal des überwachten Toilbildes kann dom Ausgangsvidaosignal zugemischt werden. Die Einstellung seines Holligkeitspegols ist möglich. Die Löschung wird entweder manuell, oder automatisch vorgenommen.In an advantageous embodiment, 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.

In der in Figur 2 dargestellten Schaltungsanordnung ist der in Figur 1 als Steuereinheit 5 bezeichnete Block ausführlicher veranschaulicht.The block shown in FIG. 1 as the control unit 5 is illustrated in more detail in the circuit arrangement shown in FIG.

Mit Hilfe des von der Synchrontrennstufe 4 erhaltenen, Synchronsignalgemisches erzeugt die Steuerstufe 10 die Taktimpulse und Gattersignale der spaltenbildenden Stufe 11, sowie das Eingangssignal des Halbbildwählers 12; desweiteren erzeugt die Steuerstufe 10 das Signal der Operationszeit tM laut Figur 3 für dio Spaltonwäuhlerstufe 13 und für den A/D Wandler und Zwischenspeicher 7. Die Steuerstufe 10 bildet die Hilfsignale des A/D Wandlers und Zwischenspeicher 7 (z.B. das Clamper-Signal tD für die Digitalisierungszeit und im Bedarfofall das Takt- signal); zweckmäßig ist das Taktsignal in der Phase zu dem Zeilensynchronsignal gebunden. Die Steuerstufe 10 erzeugt außerdem das tE Signal laut Figur 3 für den Speicher 8, die Adressierungssignale des Speichers, sowie das R/W Lesen- und Schreibonsignal laut Figur 3 aus dem Ausgangssignal der Halbbildwählenstufe 12.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.

Oberdies wird der Steuerstufe 10 die Aufgabe zugeteilt mit Hilfe des Ausgangssignals der fensterbildenden Stufe 6 das Signal der Vergleichszeit tH laut Figur 3 für die vergleichende und das Fehlersignal bildende Einheit 9, sowie das vertikale Taktsignal der fensterbildenden Stufe 6 zu erzeugen.In addition, the 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.

Die spaltenbildende Stufe 11 erzeugt aus den Ausgangssignalen der Steuerstufe 10 die den vertikalen Streifen entsprechenden horizontalen Sequenzen für die Spaltenwählerstufe 13 und die fensterbildende Stufe 6.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.

Die Halbbildwählerotufe 12 erzeugt aus dem Signal der Steuerstufe 10 die Eingangssignale der Spaltenwählerstufe 13. Die Halbbildwählerstufe 12 erzeugt für die Steuerstufe 10 die Basiszykluszeit T der Figur 4 gemäB.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.

Die Spaltenwählerstufe 13 erzeugt das Gattersignal des A/D Wandlers und Zwischenspeicher 7 aus den Signalen der spaltenbildenden Stufe 11, der Halbbildwählerstufe 12 und der Steuerstufe 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.

Claims (8)

1. Verfahren zur Digitalisierung, Speicherung, Vergleichung und Auswertung von FS-Bildern zwecks Detektierung einer Anderung und Bewegung, dadurch gekennzeichnet , daß das in horizontale und vertikale Streifen zerlegte FS-Bild als zeitlich einander folgenden Halbbildern zugeordnete vertikale Streifen - der vertikalen Zerlegung der horizontalen Streifen entsprechend - abgetastet wird, und zwar derweise, daß der digitalisierte Video-Durchschnittswert der Teilbilder innerhalb der einzelnen vertikalen Streifen in der Richtung der Bildablenkung elnzeln, aufeinancierfolgend abgebildet wird, die Information bis zum Neuschreiben in einem Speicher gespeichert wird und innerhalb dieser Zeit der Speicherinhalt einmal oder mehrmal mit dem Momentanwert verglichen wird, wonach die Differenz, deren Pegel die Auswertungsechwelle überschreitet, angezeigt wird.1. A method for digitizing, storing, comparing and evaluating FS images for the purpose of detecting a change and movement, characterized in that the FS image, which is broken down into horizontal and vertical strips, is assigned as vertical strips associated with successive fields - the vertical decomposition of the horizontal Strip accordingly - is scanned in such a way that the digitized video average value of the partial images within the individual vertical strips in the direction of the image deflection is sequentially mapped, the information is stored in a memory until it is rewritten, and the memory content within this time is compared once or more times with the instantaneous value, after which the difference, the level of which exceeds the evaluation threshold, is displayed. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet , daß die Information zyklisch in dem Speicherneu geschrieben wird.2. The method according to claim 1, characterized in that the information is cyclically rewritten in the memory. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet , daß die Information bis zum Erscheinen eines, die Auswertungsschwelle überschreitenden Fehlersignals in dem Speicher gespeichert wird.3. The method according to claim 1, characterized in that the information is stored in the memory until an error signal exceeding the evaluation threshold appears. 4. Schaltungsanordnung zur Digitalisierung, Speicherung, Vergleichung und Auswertung von FS-Bildern zwecks Detektierung einer Anderung und Bewegung, in der die Eingangseinheit direkt oder indirekt an eine Ausgangseinheit angeschlossen ist und die Eingangseinheit mit der Ausgangseinheit einen Videokanal bildet und einer der intermediären Ausgänge des genannten Videokanals über einen Schalter an eine Synchrontrennstufe angeschlossen ist, die eine Steuerstufe ist, deren einer Ausgang an dem einen Eingang eines A/D Wandlers und Zwischenspeichers angeschlossen ist, und der Ausgang der Eingangseinheit an den anderen Eingang des A/D Wandlers und Zwischenspeichers angeschlossen ist, dadurch gekennzeichnet , daß der zweite Ausgang der Steuerstufe (10) an den Eingang einer spaltenbildenden Stufe (11) und der dritte Ausgang der Steuerstufe (10) an den Eingang einer Halbbildwählerstufe (12) angeschlossen sind, während die Ausgänge der spaltenbildenden Stufe (11) und der eine Ausgang der Halbbildwählerstufe (12) an die Eingänge einer Spaltenwählerstufe (13) angeschlossen sind, und der andere Ausgang der Halbbildwählerstufe (12) an den anderen Eingang der Steuerstufe (10) angeschlossen ist, während der vierte Ausgang der Steuerstufe (10) an einen weiteren Eingang der Spaltenwählerstufe (13) angeschlossen ist und der Ausgang der Spaltenwählerstufe (13) an dem dritten Eingang des A/D Wandlers und Zwischenspeichers (7) angeschlossen ist.4. Circuit arrangement for digitizing, storing, comparing and evaluating FS images for the purpose of detecting a change and movement in which the Input unit is connected directly or indirectly to an output unit and the input unit forms a video channel with the output unit and one of the intermediate outputs of said video channel is connected via a switch to a synchronous isolating stage, which is a control stage, the output of which at one input of an A / D converter and buffer is connected, and the output of the input unit is connected to the other input of the A / D converter and buffer, characterized in that the second output of the control stage (10) to the input of a column-forming stage (11) and the third Output of the control stage (10) are connected to the input of a field selector stage (12), while the outputs of the column-forming stage (11) and one output of the field selector stage (12) are connected to the inputs of a column selector stage (13) and the other output the field selector stage (12) to the other input of the Control stage (10) is connected, while the fourth output of the control stage (10) is connected to a further input of the column selector stage (13) and the output of the column selector stage (13) is connected to the third input of the A / D converter and buffer (7) is. 5. Schaltungsanordnung nach Anspruch 4, dadurch gekennzeichnet, daß die Halbbildwählerstufe (12) eine je Zyklus geradezahlige Halbbilder enthaltende Halbbildwählerstufe bildet.5. A circuit arrangement according to claim 4, characterized in that the field selector stage (12) forms a field selector stage containing even-numbered fields per cycle. 6. Schaltungsanordnung nach Anspruch 4 oder 5, dadurch gekennzeichnet , daß die Ausgänge des A/D Wandlers und Zwischenspeichers (7) einerseits an die Eingänge des Speichers (8), andererseits an die Eingänge der vergleichenden und das Fehlersignal bildenden Einheit (9) angeschlossen sind, während die fünften Ausgänge der Steuerstufe (10) an die weiteren Eingänge des Speichers (8) angeschlossen sind.6. Circuit arrangement according to claim 4 or 5, characterized in that the outputs of the A / D converter and buffer (7) on the one hand to the inputs of the memory (8), on the other hand to the inputs of comparative and the error signal forming unit (9) are connected, while the fifth outputs of the control stage (10) are connected to the further inputs of the memory (8). 7. Schaltungsanordnung nach einem oder mehreren der Ansprüche 4 bis 6, dadurch gekennzeichnet , daß die Ausgänge des Speichers (8) an die weiteren Eingänge der vergleichenden und das Fehlersignal bildenden Einheit (9) angeschlossen sind, während der sechste Ausgang der Steuerstufe (10) an die weiteren Eingänqe der vergleichenden und das Fehlersignal erzeugenden Einheit (9) angeschlossen ist.7. Circuit arrangement according to one or more of claims 4 to 6, characterized in that the outputs of the memory (8) to the further inputs of the comparative and the error signal forming unit (9) are connected, while the sixth output of the control stage (10) is connected to the further inputs of the comparative unit (9) which generates the error signal. 8. Schaltungsanordnung nach einem oder mehreren der Ansprüche 4 bis 7, dadurch gekennzeichnet , daß in dem Videokanal zwischen der Eingangseinheit (1) und der Ausgangseinheit (3) eine Addierstufe (2) vorgesehen ist, und die Ausgänge der spaltenbildenden Stufe (11) auch an die Eingänge der fensterbildenden Stufe (6) angeschlossen sind, der eine Ausgang der fensterbildenden Stufe (6) an den anderen Eingang der Addierstufe (2) angeschlossen ist, und daß der andere Ausgang der fensterbildenden Stufe (6) an den dritten Eingang der Ste.uerstufe (10) und der siebente Ausgang der Steuerstufe (10) an den weiteren Eingang der fensterbildenden Stufe (6) angeschlossen sind.8. The circuit arrangement according to one or more of claims 4 to 7, characterized in that g in the video channel between the input unit (1) and from an adder (2) is provided angseinheit (3), and the outputs of the column forming step (11 ) are also connected to the inputs of the window-forming stage (6), one output of the window-forming stage (6) is connected to the other input of the adding stage (2), and that the other output of the window-forming stage (6) is connected to the third input the control stage (10) and the seventh output of the control stage (10) are connected to the further input of the window-forming stage (6).
EP80101616A 1979-04-17 1980-03-26 Process and circuit for evaluation of stationary television pictures consisting of lines and frames used for detecting a brightness variation cansed by a moving object Expired EP0017821B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80101616T ATE5834T1 (en) 1979-04-17 1980-03-26 METHOD AND CIRCUIT ARRANGEMENT FOR EVALUATION OF STATIONARY TELEVISION PICTURES CONSISTING OF LINES AND FIELDS FOR THE PURPOSE OF DETECTING A BRIGHTNESS CHANGE WHEN AN OBJECT MOVES.

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

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EP0017821A1 true EP0017821A1 (en) 1980-10-29
EP0017821B1 EP0017821B1 (en) 1984-01-11

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AT (1) ATE5834T1 (en)
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FR2484754A1 (en) * 1980-05-09 1981-12-18 Hajime Industries METHOD AND DEVICE FOR MONITORING A SCENE BY VIDEO CAMERA
GB2147766A (en) * 1983-10-03 1985-05-15 Fuji Xerox Co Ltd Picture image file device
FR2563676A1 (en) * 1984-04-27 1985-10-31 Licentia Gmbh METHOD FOR DETECTING SCENE CHANGES IN MOVIES AND VIDEO RECORDINGS AND MONITORING OF OBJECTS USING VIDEO CAMERAS
FR2616251A1 (en) * 1987-06-05 1988-12-09 Bertin & Cie METHOD AND DEVICE FOR DETERMINING THE NUMBER OF PEOPLE PRESENT IN A DETERMINED SPACE
EP0493718A2 (en) * 1990-12-31 1992-07-08 Goldstar Co. Ltd. System and method for automatically detecting a variation of video information
EP0805426A2 (en) * 1996-05-03 1997-11-05 Simon Kelly A surveillance system and method of operation thereof

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DE3543515A1 (en) * 1985-12-10 1987-06-11 Strahlen Umweltforsch Gmbh METHOD FOR MEASURING THE MOTIONS AND CONFIGURATIONS OF BIOLOGICAL AND NON-BIOLOGICAL OBJECTS

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DE2439159B1 (en) * 1974-08-14 1975-09-04 Peter 8000 Muenchen Schubert Security device for television pictures - digit content over picture matrix stores numbers and compares with next picture
DE2617112A1 (en) * 1976-04-17 1977-10-27 Bosch Gmbh Robert SYSTEM FOR DETECTING MOVEMENT IN THE SURVEILLANCE AREA OF A TELEVISION CAMERA

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DE2439159B1 (en) * 1974-08-14 1975-09-04 Peter 8000 Muenchen Schubert Security device for television pictures - digit content over picture matrix stores numbers and compares with next picture
DE2617112A1 (en) * 1976-04-17 1977-10-27 Bosch Gmbh Robert SYSTEM FOR DETECTING MOVEMENT IN THE SURVEILLANCE AREA OF A TELEVISION CAMERA

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2484754A1 (en) * 1980-05-09 1981-12-18 Hajime Industries METHOD AND DEVICE FOR MONITORING A SCENE BY VIDEO CAMERA
GB2147766A (en) * 1983-10-03 1985-05-15 Fuji Xerox Co Ltd Picture image file device
FR2563676A1 (en) * 1984-04-27 1985-10-31 Licentia Gmbh METHOD FOR DETECTING SCENE CHANGES IN MOVIES AND VIDEO RECORDINGS AND MONITORING OF OBJECTS USING VIDEO CAMERAS
FR2616251A1 (en) * 1987-06-05 1988-12-09 Bertin & Cie METHOD AND DEVICE FOR DETERMINING THE NUMBER OF PEOPLE PRESENT IN A DETERMINED SPACE
WO1988009978A1 (en) * 1987-06-05 1988-12-15 Bertin & Cie Process and device for determining the number of persons present in a given space
EP0296011A1 (en) * 1987-06-05 1988-12-21 Bertin & Cie Method and device for determining the number of persons present in a determined room
EP0493718A2 (en) * 1990-12-31 1992-07-08 Goldstar Co. Ltd. System and method for automatically detecting a variation of video information
EP0493718A3 (en) * 1990-12-31 1993-04-07 Goldstar Co. Ltd. System and method for automatically detecting a variation of video information
EP0805426A2 (en) * 1996-05-03 1997-11-05 Simon Kelly A surveillance system and method of operation thereof
EP0805426A3 (en) * 1996-05-03 1999-04-14 Simon Kelly A surveillance system and method of operation thereof

Also Published As

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DE3066073D1 (en) 1984-02-16
EP0017821B1 (en) 1984-01-11
ATE5834T1 (en) 1984-01-15
HU179193B (en) 1982-09-28

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