CA1045732A - Intruder detector system and method therefore - Google Patents
Intruder detector system and method thereforeInfo
- Publication number
- CA1045732A CA1045732A CA267,034A CA267034A CA1045732A CA 1045732 A CA1045732 A CA 1045732A CA 267034 A CA267034 A CA 267034A CA 1045732 A CA1045732 A CA 1045732A
- Authority
- CA
- Canada
- Prior art keywords
- line
- image
- imager
- outputs
- frame store
- 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.)
- Expired
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
- G08B13/19602—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
- G08B13/19654—Details concerning communication with a camera
- G08B13/19658—Telephone systems used to communicate with a camera, e.g. PSTN, GSM, POTS
-
- 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
- G08B13/19678—User interface
- G08B13/19691—Signalling events for better perception by user, e.g. indicating alarms by making display brighter, adding text, creating a sound
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Burglar Alarm Systems (AREA)
- Closed-Circuit Television Systems (AREA)
Abstract
Abstract of the Disclosure In an intruder detector system, an image is formed at a CCD imager, the image details transferred to a CCD frame store and a further image formed at the imager.
The two images are compared in a differencer and outputs produced related to any image differences. To provide for the reduced bandwidth available when using a telephone line, the outputs are processed so that only beginnings and ends of signals, which are representative of movements, are transmitted over the telephone line to a monitoring terminal.
The two images are compared in a differencer and outputs produced related to any image differences. To provide for the reduced bandwidth available when using a telephone line, the outputs are processed so that only beginnings and ends of signals, which are representative of movements, are transmitted over the telephone line to a monitoring terminal.
Description
This invention relates to intruder detector systems, and to methods therefore, and is particularly applicable to such a system which can use existing telephone facilities.
Conventional intruder systems are of varying forms, for example photo-electric and infrared beams, sonic and ultrasonic detectors, microwave, radar, infrared and of course visual by remote cameras. All these systems suffer from various false alarm problems, which problems vary from one type of system to another.
Closed circuit TV (CCTV) intruder systems have been in use for a long time but such systems have several disadvantages, including high cost of remote cameras and installation, viewer fatigue and lack of flexibility.
The present system uses a relatively inexpensive camera and a signal processing system in which successive images are compared, only changes in the images producing signals, and the signals processed such that only beginnings ;
and endings of motion changes are recorded for each scan line, the signals then being of a bandwidth which can be transmitted over an ordinary telephone line. This provides a "silhouette"
picture in real time of a moving object, to be reconstituted.
Various ways of transmitting the signals can be used, ~or example via a PBX system, an automatic dialler, or even a hard wired system can be provided.
The invention will be readily understood by the following description of certain embodiments, by way of example, in conjunction with the accompanying drawings, in which:-Figure 1 is a diagrammatic illustration of the detector and alternative transmission and terminal systems;
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Figure 2 is a diagrammatic representation of the signal producing circuit of the detector;
Figure 3 is a very diagrammatic representation of an image viewer, illustrating the actual signal positions -on an image.
As illustrated in Figure l, the system .
comprises a CCD camera lO which has a CCD imager, a COD Frame store and other electronic devices, as will be described later in relation to Figure 2. From the camera lO signals can be transmitted by a conductor ll to a telephone set 12.
Once a signal has been transmitted to the telephone set, it can be caused to follow a number oF paths to viewing terminals. Figure l illustrates three paths and these are intended to be alternative paths, only one being provided, although the three are all shown connected to the telephone set 12 in Figure l.
One path is via a PBX 13 to a terminal 14 by .~ conductors 15 and 16 respectively. Normally the telephone would be connected to an allotted line in the PBX and thus directly connected to the terminal. An alternative path is via an automatic dial system with associated telephone network 17 -to a terminal 18 via concluctors l9 and 20 respectively. A third path is hard wired with conductors 21 directly connecting the telephone set 12 with a terrninal 22.
In the system in which the telephone set 12 is . connected either to terminal 14 or terminal 18, via existing telephone wires, the terminal can be fixed or mobile. If mobile, . a radio - telephone link is provided between the terminal and the standard telephone system.
. 30 Figure 2 illustrates the arrangement of the . circuitry in the camera 10. A first CCD device 25 receives an :~ 2 , ... .
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image of whatever the camera is set ~o survey. The information in the imager device 25 is transferred to a further CCD device 26 which acts as a frame store. This is done by known convent-ional means. A further image is then received by the imager device 25. Informa-tion from both the imager device and the frame store device 26 are fed to a differencing circuit 27 which compares the signals, bit by bit, from the imager 25 and frame store 26.
Only changes in video signal are passed on by the differencer, these changes indicative of motions in the camera field or of light changes. To further reduce the band-width, signals from the diFferencer 27 are passed to a signal processor 28, where signals are processed so that only the beginnings and ends of motion changes are forwarded for each scan line. These signals can then be transmitted over an ordinary twisted pair of conductors and yet provide sufficient information for a silhouette picture, in real time, of a moving object, to be reconstituted at the terminal, which can be a CRT.
After the information from both the imager and frame store is compared, the information in the imager is transferred to the frame store and a new image received at the imager. The comparison of information is then repeated. If there has been no movement in the fielcl of the camera, then each succeeding image is the same, no output signal occurs from the differencer 27. This situation remains until some change occurs in the image. Then a signal is output from the differencer 27 to the processor 28 and thence to the telephone and finally the terminal. This signal can then cause an alarm to sound and at the same time cause a viewer (CRT) to switch on to give a display. It is not necessary to have a viewer on all the time.
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Also, by this means, it is possible to have several cameras connected to one viewer.
The observer can watch the viewer to see what happens. If no further movement occurs, then no further signals reach the viewer which then goes blank - and can shut off.
If movement in the camera field continues, further signals are received by the terminal and a moving silhouette will be observed.
The camera can be associated with a speaker phone, indicated at 30 in Figure 1, and by means of the voice link already established via the telephone set 12, it provides a two-way conversation oF challenge and reply. This detection and challenge capability can reduce the false alarm problem considerably, a serious defect of conventional motion detection systems, as any person who has a right to be in the area under surveilance can identify themselves, possibly with some unique identification information.
As described above, only signals indicative of the beginnings and ends of movement are transmitted. The beam of the CRT viewer is switched on by the signal indicating the beginning of a movement - in the line scanned - and the beam stays on until the signal indicative of the end of the movement is received. Thus, considering Figure 3, which represents a viewing screen 35, scan lines are indicated at 36. The scan lines 36 are of course considerably coarser than in actuality. The screen ; 35 will of course also correspond to the two CCD devices 25 and 26 in that the arrangement of the bits of the displays will provide scan lines corresponding to the scan lines 36.
Thus, assuming that an object~ for example a person, is moving in the -field of the camera, as the two devices 25 and 26 are scanned and the output signals compared, signals ~ 7 ~ Z
are transmitted via the telephone 12 and other parts of the system, to a ter~inal viewer 14, 18 or 22.
At the terminal, for a particular line, a signal will be received corresponding to the beginning of the silhouette, the signal switching on the CRT beam - as indicated at 37 in Figure 3. The beam stays on until a signal corresponding to the end of the silhouette (of that particular line) is received, to turn off the beam, as indicated at 38 in Figure 3.
This occurs for each line and thus a silhouette of the moving object in the field of view of the camera is built up. If scanning is arranged to take place at, for example, thirty times a second, a moving image or silhouette will appear on the viewing screen 35. A typical silhouette is shown in Figure 3.
As soon as movement ceases, no image appears ; on the screen. Obviously if an intruder remains stationary, then no image occurs, but there is no advantage for the intruder as while stationary he is safe. As soon as he moves, even to depart, this will show up on the screen. This is a useful attribute of the invention, in that if something falls, then 20 after the first imaging on the viewing screen nothing further occurs and the observer knows that it was not an intruder.
It is possible to provide a test sequence, in which, for example, on demand from the observer, an image of some device can be imposed onto the tmager 25. This can be as simple as a flashing lamp. This will produce signals as there will be a difference in sequential images, and this will be apparent at the receiver.
If desired a camera can be provided for taking a photograph to give a permanentrecord. The camera can be triggered by an observer using the telephone link already established. Alternatively, the CCD frame store itself can be a .''' ., :. ' - ' . :
source of undifferenced pictorial information by use of buffers.
Instead of processing difference information, the signal from the frame store can be fed into a digitizer 31 and thence into a buffer 32 as indicated by the dotted connection in Figure 2. The signal is then sent into the telephone line at a slow rate to accommodate the slow transmission rate of the telephone line. In this way full pictorial resolution can be ob~tained. Although this procedure would require a few seconds to acquire the picture at the remote viewer terminal, such an image properly recorded would provide secure identification information. The evidence obtained in this manner unlike the case of the remotely tripped photographic camera, would not be accessible to the intruder.
To further reduce false alarms, a time delay can be provided in the system, so that signals only reach the terminal a predetermined period after signals are received by the processor.
The system of the invention has various advantages.
For example.
1. Visual information and noise challenge/reply capability eliminate a great majority of false alarm sources present in most motion detector systems,
Conventional intruder systems are of varying forms, for example photo-electric and infrared beams, sonic and ultrasonic detectors, microwave, radar, infrared and of course visual by remote cameras. All these systems suffer from various false alarm problems, which problems vary from one type of system to another.
Closed circuit TV (CCTV) intruder systems have been in use for a long time but such systems have several disadvantages, including high cost of remote cameras and installation, viewer fatigue and lack of flexibility.
The present system uses a relatively inexpensive camera and a signal processing system in which successive images are compared, only changes in the images producing signals, and the signals processed such that only beginnings ;
and endings of motion changes are recorded for each scan line, the signals then being of a bandwidth which can be transmitted over an ordinary telephone line. This provides a "silhouette"
picture in real time of a moving object, to be reconstituted.
Various ways of transmitting the signals can be used, ~or example via a PBX system, an automatic dialler, or even a hard wired system can be provided.
The invention will be readily understood by the following description of certain embodiments, by way of example, in conjunction with the accompanying drawings, in which:-Figure 1 is a diagrammatic illustration of the detector and alternative transmission and terminal systems;
, ~'`~ .
:, . , . . :
.. , , . ~ ~
4S7~
Figure 2 is a diagrammatic representation of the signal producing circuit of the detector;
Figure 3 is a very diagrammatic representation of an image viewer, illustrating the actual signal positions -on an image.
As illustrated in Figure l, the system .
comprises a CCD camera lO which has a CCD imager, a COD Frame store and other electronic devices, as will be described later in relation to Figure 2. From the camera lO signals can be transmitted by a conductor ll to a telephone set 12.
Once a signal has been transmitted to the telephone set, it can be caused to follow a number oF paths to viewing terminals. Figure l illustrates three paths and these are intended to be alternative paths, only one being provided, although the three are all shown connected to the telephone set 12 in Figure l.
One path is via a PBX 13 to a terminal 14 by .~ conductors 15 and 16 respectively. Normally the telephone would be connected to an allotted line in the PBX and thus directly connected to the terminal. An alternative path is via an automatic dial system with associated telephone network 17 -to a terminal 18 via concluctors l9 and 20 respectively. A third path is hard wired with conductors 21 directly connecting the telephone set 12 with a terrninal 22.
In the system in which the telephone set 12 is . connected either to terminal 14 or terminal 18, via existing telephone wires, the terminal can be fixed or mobile. If mobile, . a radio - telephone link is provided between the terminal and the standard telephone system.
. 30 Figure 2 illustrates the arrangement of the . circuitry in the camera 10. A first CCD device 25 receives an :~ 2 , ... .
~ q~4S73Z
image of whatever the camera is set ~o survey. The information in the imager device 25 is transferred to a further CCD device 26 which acts as a frame store. This is done by known convent-ional means. A further image is then received by the imager device 25. Informa-tion from both the imager device and the frame store device 26 are fed to a differencing circuit 27 which compares the signals, bit by bit, from the imager 25 and frame store 26.
Only changes in video signal are passed on by the differencer, these changes indicative of motions in the camera field or of light changes. To further reduce the band-width, signals from the diFferencer 27 are passed to a signal processor 28, where signals are processed so that only the beginnings and ends of motion changes are forwarded for each scan line. These signals can then be transmitted over an ordinary twisted pair of conductors and yet provide sufficient information for a silhouette picture, in real time, of a moving object, to be reconstituted at the terminal, which can be a CRT.
After the information from both the imager and frame store is compared, the information in the imager is transferred to the frame store and a new image received at the imager. The comparison of information is then repeated. If there has been no movement in the fielcl of the camera, then each succeeding image is the same, no output signal occurs from the differencer 27. This situation remains until some change occurs in the image. Then a signal is output from the differencer 27 to the processor 28 and thence to the telephone and finally the terminal. This signal can then cause an alarm to sound and at the same time cause a viewer (CRT) to switch on to give a display. It is not necessary to have a viewer on all the time.
' ~ 7 3 ~
Also, by this means, it is possible to have several cameras connected to one viewer.
The observer can watch the viewer to see what happens. If no further movement occurs, then no further signals reach the viewer which then goes blank - and can shut off.
If movement in the camera field continues, further signals are received by the terminal and a moving silhouette will be observed.
The camera can be associated with a speaker phone, indicated at 30 in Figure 1, and by means of the voice link already established via the telephone set 12, it provides a two-way conversation oF challenge and reply. This detection and challenge capability can reduce the false alarm problem considerably, a serious defect of conventional motion detection systems, as any person who has a right to be in the area under surveilance can identify themselves, possibly with some unique identification information.
As described above, only signals indicative of the beginnings and ends of movement are transmitted. The beam of the CRT viewer is switched on by the signal indicating the beginning of a movement - in the line scanned - and the beam stays on until the signal indicative of the end of the movement is received. Thus, considering Figure 3, which represents a viewing screen 35, scan lines are indicated at 36. The scan lines 36 are of course considerably coarser than in actuality. The screen ; 35 will of course also correspond to the two CCD devices 25 and 26 in that the arrangement of the bits of the displays will provide scan lines corresponding to the scan lines 36.
Thus, assuming that an object~ for example a person, is moving in the -field of the camera, as the two devices 25 and 26 are scanned and the output signals compared, signals ~ 7 ~ Z
are transmitted via the telephone 12 and other parts of the system, to a ter~inal viewer 14, 18 or 22.
At the terminal, for a particular line, a signal will be received corresponding to the beginning of the silhouette, the signal switching on the CRT beam - as indicated at 37 in Figure 3. The beam stays on until a signal corresponding to the end of the silhouette (of that particular line) is received, to turn off the beam, as indicated at 38 in Figure 3.
This occurs for each line and thus a silhouette of the moving object in the field of view of the camera is built up. If scanning is arranged to take place at, for example, thirty times a second, a moving image or silhouette will appear on the viewing screen 35. A typical silhouette is shown in Figure 3.
As soon as movement ceases, no image appears ; on the screen. Obviously if an intruder remains stationary, then no image occurs, but there is no advantage for the intruder as while stationary he is safe. As soon as he moves, even to depart, this will show up on the screen. This is a useful attribute of the invention, in that if something falls, then 20 after the first imaging on the viewing screen nothing further occurs and the observer knows that it was not an intruder.
It is possible to provide a test sequence, in which, for example, on demand from the observer, an image of some device can be imposed onto the tmager 25. This can be as simple as a flashing lamp. This will produce signals as there will be a difference in sequential images, and this will be apparent at the receiver.
If desired a camera can be provided for taking a photograph to give a permanentrecord. The camera can be triggered by an observer using the telephone link already established. Alternatively, the CCD frame store itself can be a .''' ., :. ' - ' . :
source of undifferenced pictorial information by use of buffers.
Instead of processing difference information, the signal from the frame store can be fed into a digitizer 31 and thence into a buffer 32 as indicated by the dotted connection in Figure 2. The signal is then sent into the telephone line at a slow rate to accommodate the slow transmission rate of the telephone line. In this way full pictorial resolution can be ob~tained. Although this procedure would require a few seconds to acquire the picture at the remote viewer terminal, such an image properly recorded would provide secure identification information. The evidence obtained in this manner unlike the case of the remotely tripped photographic camera, would not be accessible to the intruder.
To further reduce false alarms, a time delay can be provided in the system, so that signals only reach the terminal a predetermined period after signals are received by the processor.
The system of the invention has various advantages.
For example.
1. Visual information and noise challenge/reply capability eliminate a great majority of false alarm sources present in most motion detector systems,
2. Telephone coupling allows flexibility at both camera and viewer terminal ends,
3. Normally "off" opération with a remote testing feature increases system efficiency and user convenience,
4~ Low, competitive, cost with present motion detection systems, and lower cost than closed circuit TV systems.
There are some disadvantages. For example, the visual information is inferior as compared to CCTV. However, the indication that there is an intruder is o-Ften suFficient, and if desired, the separate, remote operated, photographic camera or the full -Frame CCD option can be provided to give a permanent record and provide identification if necessary.
Automatic dialling alternative may give insufficient security in some instances.
The system is insensitive to noise and thus internal and external noise sources, such as teletypes, elevators, aircraft, trucks, rain and other noise sources do not cause false alarms. It is also insensitive to air turbulence factors, ; 10 only continuoasly created movement being detected. It is sensitive to "shadows" such as smoke. It is dependent on power source, but if powered by the telephone power source, can be independent of external power sources.
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There are some disadvantages. For example, the visual information is inferior as compared to CCTV. However, the indication that there is an intruder is o-Ften suFficient, and if desired, the separate, remote operated, photographic camera or the full -Frame CCD option can be provided to give a permanent record and provide identification if necessary.
Automatic dialling alternative may give insufficient security in some instances.
The system is insensitive to noise and thus internal and external noise sources, such as teletypes, elevators, aircraft, trucks, rain and other noise sources do not cause false alarms. It is also insensitive to air turbulence factors, ; 10 only continuoasly created movement being detected. It is sensitive to "shadows" such as smoke. It is dependent on power source, but if powered by the telephone power source, can be independent of external power sources.
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Claims (6)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS
FOLLOWS:-
1. An intruder detector system, comprising a viewer apparatus including:
a charge coupled device imager, arranged for line-by-line scanning;
a charge coupled device frame store connected to said imager for transfer of line-by-line image details to said store from said imager;
a differencing circuit, said imager and said frame store connected in parallel to the differencing circuit for line-by-line comparison of a first image in said frame store and a second image at said imager and for producing line-by-line outputs related to differences in said images;
and a processor for receiving said outputs and transmitting signals indicative of the beginnings and ends of said image difference outputs, line-by-line, via a telephone circuit to a monitoring terminal.
a charge coupled device imager, arranged for line-by-line scanning;
a charge coupled device frame store connected to said imager for transfer of line-by-line image details to said store from said imager;
a differencing circuit, said imager and said frame store connected in parallel to the differencing circuit for line-by-line comparison of a first image in said frame store and a second image at said imager and for producing line-by-line outputs related to differences in said images;
and a processor for receiving said outputs and transmitting signals indicative of the beginnings and ends of said image difference outputs, line-by-line, via a telephone circuit to a monitoring terminal.
2. A system as claimed in claim 1, including means for producing a silhouette representative of said image differences.
3. A system as claimed in claim 1, including a speaker/microphone unit associated with said viewing apparatus.
4. A system as claimed in claim 1, including means for actuating a photographic camera adjacent to said viewing apparatus.
5. A system as claimed in claim 1, including means for transmitting the image details from said frame store to produce a full pictorial image at said monitoring terminal.
6. A method of detecting intruders comprising:
forming a first image on a charge coupled device imager;
transferring line-by-line image details from said imager to a charge coupled device frame store; forming a second image on said imager; comparing said first image in said frame store and said second image at said imager and producing line-by-line outputs representative of differences between said images;
processing said outputs and producing signals indicative of the beginnings and ends of said outputs, and transmitting said signals over a telephone circuit to a monitoring terminal and producing a silhouette at said terminal.
forming a first image on a charge coupled device imager;
transferring line-by-line image details from said imager to a charge coupled device frame store; forming a second image on said imager; comparing said first image in said frame store and said second image at said imager and producing line-by-line outputs representative of differences between said images;
processing said outputs and producing signals indicative of the beginnings and ends of said outputs, and transmitting said signals over a telephone circuit to a monitoring terminal and producing a silhouette at said terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA267,034A CA1045732A (en) | 1976-12-02 | 1976-12-02 | Intruder detector system and method therefore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA267,034A CA1045732A (en) | 1976-12-02 | 1976-12-02 | Intruder detector system and method therefore |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1045732A true CA1045732A (en) | 1979-01-02 |
Family
ID=4107414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA267,034A Expired CA1045732A (en) | 1976-12-02 | 1976-12-02 | Intruder detector system and method therefore |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1045732A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4467142A (en) * | 1981-09-18 | 1984-08-21 | Licentia Patent-Verwaltungs-Gmbh | System for transmitting emergency calls from persons requiring assistance |
| US5164979A (en) * | 1989-11-21 | 1992-11-17 | Goldstar Co., Ltd. | Security system using telephone lines to transmit video images to remote supervisory location |
| EP0967584A2 (en) * | 1998-04-30 | 1999-12-29 | Texas Instruments Incorporated | Automatic video monitoring system |
-
1976
- 1976-12-02 CA CA267,034A patent/CA1045732A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4467142A (en) * | 1981-09-18 | 1984-08-21 | Licentia Patent-Verwaltungs-Gmbh | System for transmitting emergency calls from persons requiring assistance |
| US5164979A (en) * | 1989-11-21 | 1992-11-17 | Goldstar Co., Ltd. | Security system using telephone lines to transmit video images to remote supervisory location |
| EP0967584A2 (en) * | 1998-04-30 | 1999-12-29 | Texas Instruments Incorporated | Automatic video monitoring system |
| EP0967584A3 (en) * | 1998-04-30 | 2000-11-29 | Texas Instruments Incorporated | Automatic video monitoring system |
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