GB2226732A - Television surveillance system - Google Patents
Television surveillance system Download PDFInfo
- Publication number
- GB2226732A GB2226732A GB8916234A GB8916234A GB2226732A GB 2226732 A GB2226732 A GB 2226732A GB 8916234 A GB8916234 A GB 8916234A GB 8916234 A GB8916234 A GB 8916234A GB 2226732 A GB2226732 A GB 2226732A
- Authority
- GB
- United Kingdom
- Prior art keywords
- image
- signal
- picture
- control unit
- record
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
- G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
- G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
- G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
- G08B13/19639—Details of the system layout
- G08B13/19641—Multiple cameras having overlapping views on a single scene
-
- 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
-
- 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
- G08B13/19695—Arrangements wherein non-video detectors start video recording or forwarding but do not generate an alarm themselves
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/02—Control of operating function, e.g. switching from recording to reproducing
- G11B15/023—Control of operating function, e.g. switching from recording to reproducing remotely controlled
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B31/00—Arrangements for the associated working of recording or reproducing apparatus with related apparatus
- G11B31/006—Arrangements for the associated working of recording or reproducing apparatus with related apparatus with video camera or receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
- H04N5/45—Picture in picture, e.g. displaying simultaneously another television channel in a region of the screen
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
Abstract
The system comprises a monitoring circuit for a VTR and includes an image-record selector 8 which triggers image- recordal in response to an intruder operating a sensor LP, Q5, and a picture-in-picture unit 4 which processes image signals from at least one video camera 2, 3 so as to prepare the video camera signals for recordal. Preferably, the circuit further comprises a switching control unit 7, a plurality of switching circuits SW1-SW5, and a video recording control unit (5). The switching circuits SW1-SW5 are connected to various inputs and outputs of the picture-in-picture unit 4. <IMAGE>
Description
A MONITORING CIRCUIT FOR A VTR
The present invention relates to a monitoring circuit for a VTR. particularly to a circuit which can monitor a specified area using a VTR and video camera.
In the conventional VTR, a Pip (picture-in-picture) operation is performed simply by using a received image signal and an image signal applied from another VTR.
Thus, two screens can be recorded and reproduced at the same time, using the Pip screen - which consists of a main screen and a dependent screen.
The present invention seeks to provide a monitoring circuit which can be used to monitor a specified area and record images of any intruder. The arrangement can thus be used for the surveillance of valuables.
According to the present invention there is provided a monitoring circuit for a VTR comprising: an image-record selector which triggers image recordal in accordance with the operation of a sensor, and a picture-in-picture unit which processes image signals from at least one video camera so as to prepare the signals for recordal.
An embodiment of the present invention will now be described, by way of example only and with reference to the accompanying drawings, in which :
Figure 1 is a circuit diagram of an embodiment of the present invention,
Figure 2 is a detailed circuit diagram of the present invention, and
Figure 3 is an equipment static diagram of the camera and VTR as used in the embodiment of the present invention.
The embodiment of the invention will -first be described with reference to figures 1 and 3. A broadcasting signal selected by tunner 1 is applied, as the video signal 1, to a Pip block 4 via a switching circuit SW2.
Video signal 1 is also applied to an image-record board 5. The image-record board 5 provides a signal, as video signal 2, to Pip block 4 via switching circuit SW3.
Board 5 also provides for recordal of the signal, using the video head, in accordance with a record control signal from MICOM 6.
A PiP video signal is genrated by Pip block 4 and is applied to an RF converter and to the output stage of the line signal via switching circuits SW4 and SW5.
The output of PiP block 4 is also applied to the image-record board 5, via switching circuits SW4 and SW1 Switching circuits SW1-SW5 are controlled by the output level of an AND gate Al. Switching circuits SW2 and SW3 select an image signal from camera 2 or camera 3, as shown in Figure 1.
With reference to figure 2, input signals applied to the bases of transistors TR2 and TR3 are selectively provided through the emitters of those transistors. One of the transistors TR2 and TR3 is selected by operation of transistor TR1 in accordance with a control input.
The output of AND gate Al is applied as the control input to switching circuits SW1-SW5, The record-control signal from MICOM 6 and the signal selected by the selecting switch SW7 (which selects between the camera and the normal VTR signal), are applied to respective input terminals of AND gate Al.
An image-record selector 8 is constructed so that operation of lamp LP is controlled by selecting switch
SW7. whereby transistors Q1-Q4 are controlled by output from a phototransistor Q5. That is, when light from lamp LP illuminates the base of phototransistor Q5, phototransistor Q5 is turned on. When the illumination is removed the phototransistor is turned off. If the lamp LP and the VTR 10 (including phototransistor Q5) are installed as shown in Figure 3, the light of the lamp LP is blocked from the base of the phototransistor
Q5 when an intruder comes near an article which is in custody or under surveillance. Thus, the apparatus can be arranged such that the PiP block 4 begins to record when illumination of the article is interrupted.
Switching unit 7 comprises transistors Q1 and Q3 and these are driven by the output from the image-record selector 8. Selector 8 is under the control of selecting switch SW7, which switch is connected in parallel with recording switch SW6 contained in unit 7.
Switch SW6 is operable to interconnect the emitter of Q1 and the collector of Q2.
Operation of the switching circuit shown in Figure 2 will now be described.
Separate input signals are respectively applied to the base of both of transistors TR2 and TR3. These signals are selectively transmitted to the emitters of transistors TR2 and TR3 under the control of a control input signal applied to transistor TR1..
That is, when the control input is HIGH the level signal is applied to the base of both of transistors TR1 and
TR3. Thus, transistor TR1 is turned on and transistor
TR3 is turned off. As a result transistor TR2 is turned on. Since transistor TR2 is turned on and transistor TR3 is turned off 1 the signal applied to the base of the transistor TR2 is applied to the signal output.
If the control input is LOW, transistors TR1 and TR2 are turned off and only transistor TR3 is turned on. Thus, the signal applied to the base of the transistor TR3 is applied to the signal output.
The output of AND gate Al is applied to the switching circuit SW1-SW5 so that the switching circuits SW1-SW5 connect to terminals b, as illustrated in figure 1, when the output of the AND gate Al is HIGH. The switching circuits SW1-SW5 are connected to terminals c when the ouput of AND gate Al is LOW.
Cameras 2 and 3 are installed in suitable positions so as to monitor for intruders. The lamp is located with respect to the VTR as shown in Figure 3 so that the light from the lamp is interrupted if an intruder approaches the article in custody. That is. image record selector 8 is arranged such that lamp LP normally illuminates the base of phototransistor Q5, but illumination of the base of phototransistor Q5 is interrupted when an intruder approaches the article in custody.
If selecting switch SW7, which regulates the recording facility, is switched to the normal position indicated in figure 1, lamp LP is not driven and the input to AND gate Al becomes LOW. Thus, the output of AND gate Al also becomes LOW. As a result, switching circuits
SW1-SW5 are connected to terminals c.
Also, phototransistor Q5 is turned off when the lamp LP is not driven. Transistor Q4 is therefore turned on, transistor Q3 is turned off, and transistor Q1 is turned on. However, transistor Q2, which is connected in series with the transistor Q1 is turned off by this operation of the selecting switch SW7. Hence, record key-scan is carried out only by switch SW6.
On the other hand, if the switching circuits SW1-SW5 are connected to terminals c due to a LOW-level output from
AND gate Al; the video signal provided from tunner 1 is applied to the image-record board 5 through switching circuit SW1, and the image-record board 5 applies the signal, as video signal 2, to the PiP block 4 through switching circuit SW3.
The video signal provided from tunner 1 is also applied to Pip block 4, as the video signal 1, through switching circuit SW2. The output video signal from PiP block 4 is applied to the RF converter and the line signal through switching circuits SW4 and SW5.
If the switch SW6 is ON, because selecting switch SW7 is in the "normal" position, MICOM 6 provides the record control signal to the image-record board 5. As a result, image-record board 5 records the video signal from tunner 1 through the video head.
If selecting switch SW7 is switched to the camera, so as to carry out the monitoring operation, lamp LP is driven and a HIGH level signal is applied to the input of AND gate Al. At this time, either lamp LP illuminates the base of phototransistor Q5 (normal monitoring state) or the lamp does not illuminate the base of phototransistor
Q5 (intruder detected state).
If lamp LP illuminates the base of phototransistor Q5; transistor Q4 if turned OFF, transistor Q3 is turned ON, and transistor Q1 is turned OFF. That is, the record scanning pulse of MICOM 6 is applied through recording switch SW6, even if transistor Q2 is turned ON by the operation of switch SW7. Thus, the initial state is maintained, as the selecting switch SW7 is in the "normal" position. But, if recording switch SW7 is manually turned ON, the MICOM provides a HIGH level record control signal and the output of AND gate Al becomes HIGH. Thus, switching circuits SW1-SW5 select the b terminals. The image signals from cameras 2 and 3 are therefore applied to the PiP block 4, which provides an output through switching circuit SW4 and SW5.The
Pip output signal is also recorded by the video head via switching circuit SW1 and image-record board 5.
Thus, even if lamp LP illuminates the base of phototransistor Q5, by switch SW7 being set to camera selection, the image signal from the camera is applied to the RF converter and the line signal, after being converted to a PiP signal by PiP block 4 - when recording switch SW6 is ON. Also, the image signal is applied to the image-record board 5 for recordal via the video head.
A description will now be given of the case in which the base of transistor Q5 is not illuminated, with switch
SW7 set to select the camera input. Such circumstances arise when an intruder is located between lamp LP and phototransistor Q5.
If lamp LP does not illuminate the base of phototransistor Q5 , then transistor Q5 is turned off.
Transistor Q4 is turned ON. Transistor Q3 is turned
OFF, and transistor Q1 is turned ON.
Transistor Q2 is turned on since the power supply Vcc is applied to the base thereof as a result of the setting of switch SW7.
That is, no signal is applied to the base of the phototransistor Q5, but transistors Q1 and Q2, which are connected in parallel with recording switch SW6, are turned on. Thus, the record scanning pulse of MICOM 6 is applied through transistors Q1 and Q2, so that MICROM 6 provides a HIGH level record control signal.
This HIGH level signal is applied to an input terminal of AND gate Al1 changing the output of AND gate Al to the HIGH level. Thus, switching circuits SW1-SW5 connect via terminals b and image signals from cameras 2 and 3 are output, as PiP signals1 via PiP block 4.
These Pip signals are applied to the image-record board 5 through the switching circuits SW4 and SW1 and are recorded via the video head.
Thus, if lamp LP does not illuminate the base of phototransistor Q5 (because of the presence of an intruder), transistor Q1 is turned on and MICOM 6 outputs the record control signal. The record control signal, via AND gate Al, connects the switching circuits SW1-SW5 via the b terminals. As a result, image signals from cameras 2 and 3 are output as PiP signals, by PiP block 4, to the RF converter and the line signal.
In addition, the Pip signal is recorded via image-record board 5. The recorded Pip signal comprises the video signals from cameras 2 and 3. If an intruder does not approach the article in custody, that is, lamp LP illuminates the base of phototransistor Q5, then the recording process can be manually operated. However, if lamp LP does not illuminate the base of the phototransistor Q5 (because of the presence of an intruder), the image signals captured by cameras 2 and 3 are automatically recorded, as a PiP signal, so that pictures of the intruder are recorded.
The arrangement can be used to record the image signal only when an intruder is detected. That is, no recordal of image signals occurs in normal circumstances (the stand-by state), so that there is no waste of the tape.
As mentioned above, the present invention can be used for a monitoring operation in which images are recorded only when there is an intruder in the specified area.
The invention is not limited to the embodiment described hereinabove. Various modifications of the disclosed embodiment as well as other embodiments of the invention will be readily apparent to persons skilled in the art upon reference to the above description of the invention. All such modifications and embodiments fall within the scope of the invention.
Claims (5)
1. A monitoring circuit for a VTR comprising: an image-record selector which triggers image recordal in accordance with the operation of a sensor, and a picture-in-picture unit which processes image signals from at least one video camera so as to prepare the signals for recordal.
2. A monitoring circuit as claimed in claim 1, wherein the sensor comprises a light emitting part in the form of a lamp and a light absorbing part in the form of a phototransistor Q5.
3. A monitoring circuit as claimed in claim 1 or 2, further comprising a switching control unit, a plurality of switching circuits1 a video recording control unit and a MICOM, the switching control unit being connected between the image-record selector and the MICOM, the
MICOM being connected to the video recording control unit and to the switching circuits and the switching circuits being connected to various inputs and outputs of the picture-in-picture unit.
4. A monitoring circuit as claimed in claim 3, wherein the switching control unit comprises a recording switch connected in parallel with two transistors, said transistors being controlled by the image-record selector.
5. A monitoring circuit for a VTR, substantially as hereinbefore described with referene to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR880022665 | 1988-12-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8916234D0 GB8916234D0 (en) | 1989-08-31 |
GB2226732A true GB2226732A (en) | 1990-07-04 |
Family
ID=19282987
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8916234A Withdrawn GB2226732A (en) | 1988-12-31 | 1989-07-14 | Television surveillance system |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE3923361A1 (en) |
GB (1) | GB2226732A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5432561A (en) * | 1992-03-27 | 1995-07-11 | North American Philips Corporation | System for automatically activating picture-in-picture when an auxiliary signal is detected |
GB2298756A (en) * | 1995-03-07 | 1996-09-11 | Anthony George Martin | Security system domestic video recorder controller |
EP0819358A1 (en) * | 1995-04-07 | 1998-01-21 | WASHINO, Kinya | Video monitoring and conferencing system |
WO1999059340A1 (en) * | 1998-05-08 | 1999-11-18 | Koninklijke Philips Electronics N.V. | Observation system |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69129923T2 (en) * | 1990-05-11 | 1999-01-21 | Toshiba Kawasaki Kk | Videophone |
KR930007060B1 (en) * | 1991-01-09 | 1993-07-26 | 삼성전자 주식회사 | Recoding and displaying system in vtr |
KR950000048B1 (en) * | 1992-03-23 | 1995-01-07 | 대우전자 주식회사 | Nonstop recording method for double deck |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4651143A (en) * | 1984-09-25 | 1987-03-17 | Mitsubishi Denki Kabushiki Kaisha | Security system including a daughter station for monitoring an area and a remote parent station connected thereto |
GB2182224A (en) * | 1985-10-24 | 1987-05-07 | Videoscan Ltd | Methods and apparatus for monitoring events |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3716319C1 (en) * | 1987-05-15 | 1988-08-18 | Engmann Brigitte | Video recorder |
-
1989
- 1989-07-14 DE DE19893923361 patent/DE3923361A1/en active Granted
- 1989-07-14 GB GB8916234A patent/GB2226732A/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4651143A (en) * | 1984-09-25 | 1987-03-17 | Mitsubishi Denki Kabushiki Kaisha | Security system including a daughter station for monitoring an area and a remote parent station connected thereto |
GB2182224A (en) * | 1985-10-24 | 1987-05-07 | Videoscan Ltd | Methods and apparatus for monitoring events |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5432561A (en) * | 1992-03-27 | 1995-07-11 | North American Philips Corporation | System for automatically activating picture-in-picture when an auxiliary signal is detected |
GB2298756A (en) * | 1995-03-07 | 1996-09-11 | Anthony George Martin | Security system domestic video recorder controller |
GB2298756B (en) * | 1995-03-07 | 1997-05-14 | Anthony George Martin | Domestic video cassette recorder control box |
EP0819358A1 (en) * | 1995-04-07 | 1998-01-21 | WASHINO, Kinya | Video monitoring and conferencing system |
EP0819358A4 (en) * | 1995-04-07 | 2000-01-26 | Kinya Washino | Video monitoring and conferencing system |
WO1999059340A1 (en) * | 1998-05-08 | 1999-11-18 | Koninklijke Philips Electronics N.V. | Observation system |
Also Published As
Publication number | Publication date |
---|---|
GB8916234D0 (en) | 1989-08-31 |
DE3923361A1 (en) | 1990-07-12 |
DE3923361C2 (en) | 1990-11-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |