DE2606827A1 - Monitor using at least one TV camera - monitored space covered by camera to deliver deviation signal - Google Patents

Abstract

A change-over switch connects the monitor input to the t.v. camera or to the source or further t.v. signals. The switch is electrically controlled. A sensor (5) is provided for the space to be monitored by the camera (10), which delivers a signal when at least one parameter of the space to be monitored deviates from a specified nominal values. This sensor signal switches the switch (3) to the t.v. camera assigned to monitor the space. A h.f. receiving section (2) is provided so that normal t.v. programmes can be used. A magnetic plate recording facility (4) is connected to the camera output (10) so that the signals can be stored for a specified time.

Description

Ing.Karl Vockenhuber, llRO Vienna, pötzieinsdorferstrasse 118 DDr. Raimund Hauser, 1040 Vienna, Goldeggasse 2/2/2/9 "Monitoring device" The invention relates to a surveillance device with at least one television camera pointing towards one monitored room is aligned and provides a television signal, and at least a television monitor and a source for a further television signal, furthermore with a switch that connects the input of the monitor either with the television camera and the source of the further television signal.

With the help of television cameras remote monitoring of valuables, Industrial objects and the like possible in a simple manner. The one for displaying the television picture The monitor provided can be set up at any location, for example in the lounge of the person charged with monitoring a property. In disadvantageously, however, leads to long-term consideration of an unchanged Figure 7U a decrease in the attention of the observer or to a Decrease in concentration. Such phenomena represent reliability a monitoring system in question.

The invention is therefore based on the object of a monitoring device to create a reliable evaluation of their signals by the observer at all times enables.

According to the invention, therefore, in a monitoring device the Proposed type mentioned at the beginning that the switch in a known manner is electrically controllable by a control signal that also a sensor for the through the TV camera is provided to be monitored, which emits a signal when at least one parameter of the room to be monitored from a specified setpoint deviates, whereby the signal of this sensor the Uischalter in the input of the monitor controls and when the sensor is excited, the television monitor switches to at least causes the image signal of the television camera monitoring the room in question.

The invention therefore makes it possible for those with the monitoring commissioned person, for example, any television (entertainment) program can look at without paying attention to an image that is not moving in itself have to. Only when the sensor detects a change in the object to be monitored, the television picture is switched over to that of the surveillance television camera immediately recorded television picture. This means that the monitoring person is now theirs full concentration, which can be achieved in an advantageous manner through attentive contemplation of the entertainment program is constantly given, one that may occur Can devote changes in the area of the object to be monitored. In advantageous Thus, the invention creates the possibility of using a monitoring system to create that at least not human weaknesses or inadequacies subject.

The invention is in the drawings in several embodiments for example shown. FIGS. 1 to 8 show schematic block diagrams of monitoring devices according to the invention.

In Fig. 1, 1 denotes the television monitor for playback the image of the object to be monitored recorded with the television camera 10 is provided. With 2 is a high-frequency receiving part for an entertainment television broadcast program designated. The output of the receiving section 6 2 and the output of the television surveillance camera 10 are connected to a switch 3. The switch 3 is designed such that either the information from the receiving part 2 or the information the television camera 10 can be switched to the input of the television monitor 1. Furthermore, a magnetic disk memory 4 is connected to the output of the television camera 10, which stores the output signal of the television camera 10 for a certain period of time. A comparison stage 5 is connected to the output of the magnetic disk memory, the delayed signal of the magnetic disk memory fed to its one input with a new output signal of the television camera occurring at the time of the comparison 10 compares. The output signal of the comparison stage 5 is used as the control signal Changeover switch 3 supplied.

If there is a change in the area of the object to be observed, so the output signal of the television camera 10 changes in a corresponding manner, where any information, for example due to a change in brightness, The electrical signal caused by a change in contrast or a change in sharpness can be evaluated can. This signal, which indicates a change, is included in the comparison stage 5 the signal provided by the magnetic disk storage 4 that this change is still does not include compared. The size determined by the comparison causes the Switching of the switch 3. So essentially in the comparison stage an actual signal output by the television camera 10 is compared with a target signal.

The switch 3 is set in its idle state so that the entertainment program is always shown on the monitor. Is at the exit of the Comparison stage 5 for a characteristic signal assigned to a change Available, for example by means of a relay, the contact of the connecting line interrupted from the receiving part 2 to the monitor 1 and the contact from the television camera 10 can be connected to the monitor 1, whereby the observer on the monitor 1 immediately is confronted with the events in the recording area of the television camera 10.

Furthermore, the television camera can be connected to an amplifier, not shown microphone are assigned. The output of the amplifier will be then also passed to the monitor via switch 3, so that the observer In addition to the optical information, you may also perceive informative noises can.

In Fig. 2, a monitoring device is shown, the one A plurality of television cameras 10, 20, 30, 40, 50, 60 has. All of these television cameras are indirectly connected to a single monitor 1 for monitoring several objects connected. As in FIG. 1, a general TV program (receiving part 2) can be viewed. The switch 33 has for each of the television cameras (10, 20, etc.) has a switch-on contact with the monitor 1. Each changeover contact can be through an electronic or mechanical contact be given. A line leads from the output of each television camera to another Changeover switch 6, which in the illustrated embodiment is designed as a step switch is. The output of the switch 6 is on the one hand to a magnetic disk storage 7 and on the other hand connected to comparison stage 5. Between the other Changeover switch 6 and the magnetic disk memory 7 are in the same direction as the changeover switch 6 operated switch 66 is provided, which the output signal of each individual television camera, after it is stored in the electronic equipment 8 in a corresponding manner was processed, to the magnetic head associated with a particular television camera Track of the magnetic disk leads. The one stored on a specific track on the magnetic disk After appropriate processing in the amplifier 9, the signal is sent to the other input the comparison level 5 performed. As in FIG. 1, the output of the comparison stage is connected to the control input of the switch 33. To control the switch 6 and 66, a clock generator 11 is provided, which is also used at the time of the comparison of the signals in the comparison stage 5, the output signal of the associated television camera on the changeover contact of the changeover switch 33.

The functional sequence of the monitoring device according to FIG. 2 takes place in such a way that, for the time being, the signals from each television camera one after the other in the associated track of the magnetic storage disk.

To this end, the clock generator 11 switches the changeover switch 6 or 66 in a corresponding manner Follow on. Once the signals from all television cameras have been saved, the changeover switches 6 and 66 are switched through again, with a comparison of the signals assigned to one another takes place in the comparison stage 5.

It occurs when comparing the stored signal and the current one If the signal from a television camera shows differences, this signal is used as the control signal the switch 33 supplied. The switch 33 now immediately leads the television picture the corresponding television camera to the monitor, providing this Image is made possible by the clock 11, which is just the supply of the image signal this corresponding television camera enables.

A detailed assessment of the television picture that is now being reproduced to enable the observer, the switch 33 has a self-holding circuit, that despite further switching through of the switches 6 and 66 by the clock generator 11 at least for a certain time the observation of the television picture of the change viewing television camera allows.

It is conceivable that a device is also provided which it allows if a change is indicated by another television camera that will be at least an indication of the further change in the picture of the monitor 1 is imported.

The magnetic disk storage 7 can also be replaced by a magnetic tape are, aem in the corresponding track position a number of recording and reading heads assigned.

According to Fig. 3, a television camera 10 and a are on the switch 3 TV camera 12 connected. The switch 3 always carries the image signal TV camera 12 to the monitor 1. The TV camera 10 is for observing a object not shown provided. To capture changes in the area of the object or to switch the switch 3 is a light barrier 13 provided, the light beam of the space to be monitored near de observation object interspersed. The light barrier has a light source 14 for alternating light and a Light receiver 15, which is connected to a demodulator 16 and an inverter 17 is. The output signal of the inverter 17 is sent to the changeover switch 3 as a control signal fed. If the light beam of the light barrier 13 is interrupted, this takes place immediately a switchover of the monitor image to the image of the television camera 10. Hiebei can Again, a self-holding circuit for the changeover switch 3 is advantageously provided be.

According to FIG. 4, a video recorder 18 is connected to the switch 3 for the performance of entertainment programs or the like. Connected to the screen of the monitor 1. the TV camera also connected to switch 3 for monitoring an object is denoted by 10. The switching of the television picture supplied by the video recorder on the monitor 1 on the image of the television camera 10 takes place through the output signal a microwave receiver 21 to which a microwave transmitter 19 is assigned. A Detector 22 connected to the output of microwave receiver 21 is used for control of the switch 3.

Due to the changes detected by the microwave receiver 21 (e.g. Influence of a standing microwave in the room) is an immediate switchover the television picture on the screen of the monitor 1 from the information of the video recorder on the information of the television camera 10 is effected.

In Fig. 5 is a monitoring device for a boiler system shown. The boiler 23 has a burner 24. The smoke gases are extracted through the chimney 25. The chimney is used to observe the development of smoke or soot 25 assigned to a television camera 10. To observe the boiler 23 or its The television camera 20 is provided for fittings and the like. The outputs of the television cameras 10 and 20 are connected to the inputs of the switch 3. Furthermore, in the A light barrier 26 is arranged in the area of the exhaust gas outlet on the chimney 25, and for Recording of the flame development of the burner or the like is the A pyrometer 27 is assigned to the boiler 23. The output signals of the light barrier 26 and the pyrometer 27 are fed to the control inputs of the switch 3. the The light barrier and the pyrometer always allow the switching through of the ones assigned to them Television camera. If the corresponding control signals come from the light barrier and from the If the pyrometer is on at the same time, the TV receiver will switch over 2 to the monitor 1 fed television signal to the output signals of the television camera 10 and 20. Advantageously, the switch 3 is designed so that another, not shown switch is upstream of it, which alternately, for example every 5 seconds, only one television image from television cameras 10 and 20 leads to monitor 1.

Finally, it should be noted that to detect changes only partial signals of a television signal in the area of an observation object can be used (fig. 1 and 2). So it is conceivable, for example, only a partial area of the recording field of a television camera, possibly only a line for obtaining a comparison signal regarding the determination of a Draw on change.

Fig. 6 shows a circuit arrangement in a block diagram which it enables the entire television signal to be stored electronically. For this purpose, at the output of the pick-up tube 28, a monitoring device is used, not shown television camera connected to an image signal amplifier 29, the converts the signal into a DC voltage.

At the output of the amplifier 29 is an electronic switch 30 the memory 31, which can be given for example by a capacitor, connected. The output of the memory 31 is in turn connected to one input of the Comparison level 5 performed. The other input of the comparison stage 5 is directly on the output of the amplifier 29 is connected. The capacitor of the memory 31 acts integrating for the DC voltage obtained from the signal voltage of the pickup tube 28. But also to have relatively small changes in the image signal it to be able to determine the receiving tube 28, the capacitor of the memory 31 periodically charged for a short time with the voltage assigned to the image signal. The clock generator 32, which controls the switch 30, is provided for this purpose. In the comparison stage 5, the stored signal is then tapped off at the output of the amplifier 29 with the signal Signal compared. The output signal of the comparison stage 5 is via another electronic switch 33 led to the control input of the switch 3, wherein the switch ~ 33 is also controlled by the clock generator 32. The switch 33 is provided to prevent an output signal of the comparison stage 5 during the charge of the capacitor of the memory 31 reverses the switch 3. In the open In the state of switch 30, switch 33 is closed.

The sensitivity of the circuit arrangement shown depends on the time span between the charging of the capacitor of the memory 31 and the closure of the switch 33 is due to the fact that there are already small changes in the range of the monitored object over a relatively long period of time a sufficiently large Cause the control signal at the output of the comparison stage 5.

To the sensitivity of the monitoring device, if necessary To be able to vary, a setting regulator 34 is assigned to the clock generator 32, the clock frequency of the clock generator 32 or the switching behavior of the electronic Switches 30 and 33 influenced.

With 2 is as in the previously described figure. A receiving part for means a television entertainment program. Numeral 1 is the monitor assigned for viewing the television images.

Fig. 7 shows a schematic circuit arrangement according to the only an image section 35 for reversing the switch if necessary 3 is used. In the area of the image section 35 is on the picture tube 36 of the monitor 1 to arrange the object to be monitored.

Referring to Fig. 7, the signal from the pickup tube 37 in the video amplifier 38 amplified and via the terminal and output stage 39 to the video outlet, nec 41 led. The beam scanning the photosensitive layer of the pickup tube 37 must be deflected vertically and horizontally; the currents required are for this purpose generated in the deflection generator 42, which is fed from the pulse center 43. The required clamping, blanking and synchronizing pulses are also used from this pulse center taken. To define the image section 35, the vertical and horizontal Synchronous pulse can be brought into a certain form. To do this, contact the impulse center43 a monostable multivibrator to determine (delay) the vertical pulse 44 V and a monostable multivibrator 44 H connected for the horizontal pulse. The output pulses of these monostable multivibrators are again in the multivibrator 45 V or 45 H delayed. Each of the multivibrators are assigned controllers 18, with which the shape (delay time) can be set. The output signals of the Multivibrators 45 V and 45 H are connected to gates 46 and 47. The time, in which the gates 46, 47 are open at the same time, determines the image section. The image signal provided by the gates 46, 47 is in the signal rectifier 48 rectified, at the output of which the comparison stage 5 is connected.

A reference voltage source is connected to a further input of the comparison stage 5 51 connected. The output signal of the comparison stage 5 is at the control input of the switch 3 out. The output signal is, for example, through the switch 3 a television broadcast receiving unit 2 or the television picture of the pickup tube 37 switchable to monitor 1.

As already described above, the image section can be adjusted by means of the controller 18 35 both in terms of its size and its location in relation to the recording field of the receiving tube 37 or in relation to the image surface 36 of the monitor 1 as desired can be varied. To carry out the adjustment of the image section in a simple manner To be able to, it is advantageous to determine the size and position of the image section 35 on the monitor screen to display. To this end, the flip-flops 4 'V and 45 ii each have a positive one and a negative outcome.

These outputs are connected to the monostable via diodes D1 to D4 Multivibrators 52 and 53 connected. At the outputs of the monostable multivibrators 52 and 53 are then indication imptilse for the cutout 35 tapped, which the Video signals are supplied (at 41). The indication impulses give rise to the Image section 35, framed in white or black, depending on the polarity of the pulses.

The reference voltage source 51 has a setting regulator 54, with to which the magnitude of the reference voltage can be established, i.e. the comparison stage 5 is, for example, the lighting conditions in the area of the monitored object customizable. If any change occurs in the area of the image section 35, which causes a change in the video signal, so the switch 3 from the output the comparison stage 5 is supplied with a characteristic signal which is caused by a deviation the output voltage of the rectifier 48 (actual voltage) from the reference voltage (Target voltage) is conditional.

8 shows a circuit arrangement for controlling the changeover switch 3, which has a relatively low cost of switching stages.

The image signal of a television camera, not shown, is a Monitor 55 fed. This monitor can already be used as a viewfinder in the television camera built-in or set up away from it. The screen 56 of the monitor 55 is a photoelectric converter (photoresistor) 57 assigned so that a Changing the lighting conditions of a freely chosen, relatively small image section causes a change in the current flow in the circuit of the photoelectric converter 57. The photoelectric converter is connected to the input of a threshold switch 58. The threshold switch 58 is advantageously designed such that a Increase or decrease in the flow of current in the circuit of the photoelectric Transducer 57 causes the threshold switch 58 to switch. To set the Threshold switch 58 to a specific response value is this an adjusting regulator 59 assigned.

So if there is a change in brightness in the area of the photoelectric Converter 57 to (darkening or lightening), the threshold switch switches 58 through and controls the switch 3 to. To the inputs of the switch 3 is a television receiving part 2 and the output terminal of the unillustrated television camera connected. The output of the switch 3 leads to the also not shown Monitor 1.

The arrangement according to Fig. 8 thus also enables in a simple manner the retrofitting of an existing monitoring device with an electronically controlled switch 3, with intervention in the already existing devices can be disregarded. It's just a photoelectric one Converter of any display surface of the television picture at the desired point assign.

In principle, the changeover switch 3 can also be made by switching devices are controlled, which are not assigned to the television picture itself. So it is conceivable that, for example, an ultrasonic room monitoring system to control the switch used for the television surveillance camera image and entertainment program will. In addition, infrared barriers in the area of the monitored object can also be used are arranged to be used to operate the switch.

Many security systems for objects or buildings have contacts that are assigned to windows and doors. These contacts can also be used for control purposes of the switch can be used. For example, it is possible to have a door or the like. To be monitored with a television camera, with the person in charge of guarding can watch the usual entertainment program on his television set; will the If the door or the like is open, the switch or the switch according to the invention then switches e ffberwachungseinrichtung from the television picture of the entertainment program and the picture the surveillance camera showing the area of the door.

For monitoring garage entrances or the like or for traffic monitoring can pneumatic or hydraulic threshold switches or induction loops in the roadway be let in that respond to motor vehicles and thus the surveillance television camera switch through to the monitor using the switch.

Likewise, there are electrical, electromechanical sensors and range finders and fill level meter suitable for controlling the switch. Such are applicable Facilities in attempts to od industrial manufacturing machines. Like.

Furthermore, noises in the area of the monitored object can pass through a microphone can be detected, its signal voltage to control the switch is used.

Furthermore, automatic or manually operated fire alarms can be used connected to the control input of the switch.

Finally, the changeover switch according to the monitoring device according to the invention also be linked into electrical circuits, with changes of voltage and / or Current states cause the changeover switch and thus the television picture to be reversed. The television monitor can be used, for example, to monitor a number of electrical Measuring devices or the like. Be used.

Claims (12)

Claims Monitoring device with at least one television camera that is on a room to be monitored is aligned and supplies a television signal, and at least one television monitor and one source for another television signal, also with a switch that connects the input of the monitor to the television camera and the source of the further television signal, characterized in that the switch (3, 33) electrically in a manner known per se by a control signal it is controllable that a sensor (5, 7, 14, 15, 16, 17, 19, 21, 26, 27, 30, 57) for those to be monitored by the television camera (10, 12, 20, 30, 40, 50, 60) Space is provided that emits a signal when at least one parameter of the to monitored room deviates from a predetermined target value, the signal this sensor controls the switch (3, 33) in the input of the monitor (1) and when the sensor is excited, the television monitor (1) switches to at least causes the image signal of the television camera monitoring the room in question. 2. Monitoring device according to claim 1, characterized in that that the television camera (10) is connected to a signal delay device (4) is, whose output signal is fed to the first input of a comparison stage (5) whose second input is connected to the television signal output of the television camera (10) is connected, the output of the comparison stage (5) to the control input of the switch (3) is connected. 3. Monitoring device according to claim 2, characterized in that that a signal memory (4) is provided as a signal delay device. 4. Monitoring device according to claim 3, characterized in that that as signal memory (4) a capacitor, a magnetic disk or tape memory or Semiconductor memory or the like. Are provided. 5. Monitoring device according to one of claims 2 to 4, characterized characterized in that the changeover switch (33) has a number of input connections, each of which is assigned a television camera (10 to 20, 30, 40, 50, 60) that Each television camera has a signal memory, preferably designed as a magnetic memory (7) associated with iBt, the output of each latch (7) being connected to one input terminal connected for a television camera associated control input of the switch (33) is. 6. Monitoring device one of the preceding claims, thereby characterized in that the changeover switch (33) has a number of input connections, each of which a television camera (10, 20, 30, 40, 50, 60) is assigned that a preferably electronic further changeover switch controllable by a clock generator (11) (6) is provided, the input connections of which each have an output of the television camera are connected and its output or outputs to signal memory (7) and to the an input of the comparison stage (5) are connected, the changeover switch (33) for the signals from the television cameras and the other television signals (2 each its inputs assigned, preferably electronic, by the clock (11 Has controllable switch. 7. Monitoring device. according to claim 6, characterized in that that the memory (7) has a magnetic disk or a magnetic tape, the or the a magnetic head for each television camera (10, 2), 30, 40, 50, 60) in different track positions is assigned, wherein the magnetic heads via a by the clock (11) controlled, preferably electronic switches (66) can be activated. 8. Monitoring device according to claim 1, characterized in that that as a sensor for controlling the switch inductive - and / or optical and / or capacitive and / or acoustic barriers or temperature sensors (14, 15, 16, 17, 19, 21, 26, 27 are provided in the area of the od. The objects to be monitored. 9. Monitoring device according to one of the above claims, characterized in that one by the output signal of the switch (3, 33 ) controllable acoustic signaling device is provided. 10. Monitoring device according to one of claims 5 to 9, characterized characterized in that an actuatable by the output signal of the sensor, automatic Changeover switch for the feed from several television cameras to the switch Television signals is provided. 11. Monitoring device according to claim 10, characterized in that that the switching sequence of the changeover switch is adjustable. 12. Monitoring device according to one of the preceding claims, characterized in that the switch is also used to switch the audio signal the source of the other television program (2) to the signal from one of the television cameras (10, 20, 30, 40, 50, 60) associated acoustic receiving device is provided is. Blank page