WO1990005076A1 - Vehicle security camera - Google Patents
Vehicle security camera Download PDFInfo
- Publication number
- WO1990005076A1 WO1990005076A1 PCT/GB1989/001280 GB8901280W WO9005076A1 WO 1990005076 A1 WO1990005076 A1 WO 1990005076A1 GB 8901280 W GB8901280 W GB 8901280W WO 9005076 A1 WO9005076 A1 WO 9005076A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- camera
- vehicle
- camera according
- recording medium
- activation
- Prior art date
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
- G08B13/19665—Details related to the storage of video surveillance data
- G08B13/19671—Addition of non-video data, i.e. metadata, to video stream
- G08B13/19673—Addition of time stamp, i.e. time metadata, to video stream
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
- B60R25/01—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens
- B60R25/018—Thief traps
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B29/00—Combinations of cameras, projectors or photographic printing apparatus with non-photographic non-optical apparatus, e.g. clocks or weapons; Cameras having the shape of other objects
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
- G07C5/0841—Registering performance data
- G07C5/0875—Registering performance data using magnetic data carriers
- G07C5/0891—Video recorder in combination with video camera
-
- 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
- G08B13/19617—Surveillance camera constructional details
- G08B13/19626—Surveillance camera constructional details optical details, e.g. lenses, mirrors or multiple lenses
- G08B13/19628—Surveillance camera constructional details optical details, e.g. lenses, mirrors or multiple lenses of wide angled cameras and camera groups, e.g. omni-directional cameras, fish eye, single units having multiple cameras achieving a wide angle view
-
- 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
- G08B13/19647—Systems specially adapted for intrusion detection in or around a vehicle
-
- 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
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/04—Detecting movement of traffic to be counted or controlled using optical or ultrasonic detectors
-
- 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
Definitions
- This invention relates to a vehicle security camera, which may be automatically triggered in an emergency to make a photographic record of for example a collision, or an attempted or accomplished break-in, or initiated by an occupant when an emergency is anticipated.
- Such a device is intended to provide a photographic record to give prima-facie evidence of the cause and sequence of events in a collision, or the identity of an intruder, etc.
- a record of this kind may be for example of great value to police, civil courts and insurers in establishing the causes, sequence of evevts, and responsibility in accidents; and in the detection and prosecution of theives involved in car-related crime (theft- of or from motor vehicles) as well as in personal assaults on the occupants of vehicles.
- a vehicle security camera is adapted to be mounted in a vehicle so as to command an all- round view of the interior of the vehicle, and of the exterior of the vehicle through the vehicle windows, and includes one or more lenses adapted to give a wide field of view, the camera being operative automatically to take a plurality of exposures at predetermined intervals on activation, activation being by means for detecting the onset of an emergency, or by operation of a switch by an occupant of the vehicle.
- the -camera may record the images magnetically or photo- chemically (by video tape or photographic film) and the record may comprise still or moving pictures.
- the camera may have a plurality of so-called 'fish- eye' (very wide field) lenses, arranged to give complete coverage, with overlapping fields, and focus their respective images onto discrete areas of each frame of the recording medium (tape or film).
- the camera may be of the disc kind, although roll film or cassette film with automatic wind-on may be used.
- the mechanism may be set to take exposures and wind-on at say 5 or 10 second intervals.
- the camera may use a flash unit, or compensate f.or poor light by automatic shutter regulation.
- the camera may have a control unit which operates the shutter and wind-on mechanism, which is connected to impact sensors, as already used for operating electronically locked doors, and to sensors for detecting tampering with or forcing of doors or locks, as well as a push button switch operable by an occupant.
- the camera is preferrably contained in a strong impact resistant casing, for example 1/4 inch stainless or mild steel- It may be mounted on the front ledge, rear shelf, or in or under the ceiling of the car saloon or vehicle cab.
- a strong impact resistant casing for example 1/4 inch stainless or mild steel- It may be mounted on the front ledge, rear shelf, or in or under the ceiling of the car saloon or vehicle cab.
- Fig. 1 is a perspective view of the exterior of the camera
- Fig. 2 is a cross-sectional diagrammatic view of the camera; and Fig. 3 is a diagram showing possible alternative mounting positions for the camera in a saloon car.
- the camera is housed in a steel casing 10, of strong 1/4 inch stainless steel.
- a lens-holder dome 11 projects from the casing, and holds a plurality of
- the casing 10 includes a key-slot 13 which accepts the vehicle ignition key to switch the camera 'on', in which state it is ready to be triggered, and Off; and three indicator lights, to indicate respectively that a new film, cartridge or disc is required (14), that the camera is 'live' (15), and an indicator that the camera has operated (16).
- An actuation button 17 is also provided to enable an occupant to trigger the camera.
- Fig. 2 shows that the lenses 12 each focus onto a separate area of the frame 23 of sensitised film or other recording medium, carried here on a disc 22, which has a winding-on motor 21.
- the motor 21 is controlled by circuitry in a control unit 18, as is the camera shutter 24, and the control unit can be triggered to operate the camera by operation of the button 17, or by detection by an impact . detector (input leads 19), or of tampering with a door, e.g. with the lock, or attempted forcing (input leads 20).
- the unit 18 operates the shutter 24 and the motor 21 to take a series of exposures, e.g. a programmed number at preset intervals, such as at 5 or 10 second intervals, which show the interior of the car and its surroundings through the windows.
- a photographic record will thus be obtained of for example the sequence of events in a collision, or an attempted or accomplished break-in, or of an assault on an occupant, whicfp will be useful in investigating traffic accidents, insurance claims, and identifying theives and assailants; and perhaps in evidence in civil and criminal proceedings.
- the indicator lights function to indicate when a film disc is used up (14), that the device is 'live' and will operate if triggered (15), while light 16 will indicate that the camera has operated — e.g. if the vehicle has been left unattended, and there has been an attempted break-in or an unreported hit-and-run collision.
- the operation of the camera may be triggered by sensors for detecting body heat, or movement, which may be placed for example under the vehicle body, or below the engine bonnet andthus images of., people approaching the vehicle would be recorded . without any external indication.
- the control device 18 may be swithched On' and 'off* by a remote control ⁇ device such as used for controlling televisions, so that the the owner may switch 'off the device as he approaches, thus avoiding needless accuation by an authorised approach and entry.
- the camera may include a flash unit, or rely on a light meter and shutter speed and apperture control to compensate for poor light. If flash is used, its operation may act as a deterent to a theif, as may warning notices that the vehicle is equipped with the device.
- the camera is preferrably internally self powered, by dry cell or other suitable batteries, for security, and these batteries may be arranged to be recharged when the vehicle engine is running.
- Some possible alternative positions for the camera in a saloon car 30 are indicated in Fig. 3.
- On the front ledge 31 (position A), on the rear shelf 33 (position C) , or in or suspended from the ceiling 32 (position B) are examples. These locations are not an exhaustive list, and other places may be used, and the best location for each type and model of vehicle may need to be determined by experiment.
- the camera should have a high probability of surviving a serious collision, or vandalism, because of its robust casing. Steel is preferred to even the most robust of plastics as these will eventually crack through fatigue and chemical deterioration. " "'
- a single fish-eye or other ultra wide angle lens may be used as the camera objective, but the ⁇ - safeguard of a plurality of independantly imaged overlapping fields of view is preferred, particularly as one or more lenses may be obstructed or damaged by a colision or vandalism.
- the lenses may be mounted remote from the camera body, fibre optic cables being used to transmit the images from the image planes to the recording medium.
- a magnetic recording medium e.g.
- video tape may be used instead of photo-chemical film, and be used to record discrete still images, or to provide a real-time or accelerated motion picture record
- Simultaneous sound recording may also be provided for, using magnetic tape to record the sounds :• __ arising during a collision, and/or conversation or other sounds made by intruders. Verbal comments made by intruders may give evidence of intent.
- the same tape may also record on a separate channel digitally coded information of date and time from a calender clock device, and data relating to the handling and performance of. the vehicle. This data may be processed and fed to the tape record by a microprocesser including suitably preprogrammed chips for data processing, storage and output.
Abstract
A vehicle security camera comprises a plurality of fish-eye lenses (12) with overlapping fields of view, mounted in a dome shaped lens holder (11), to provide respective separately and discretely focused images on a recording medium frame (23) of a photographic disc film (22). The lens holder (11) is positioned with as clear a view in and around the vehicle as possible, and the camera is actuateable automatically by sensors detecting tampering with the vehicle, collision or the approach of an intruder, or by an occupant of the vehicle anticipating trouble. The recording medium may be video tape, and provision may be made for recording sounds and other data.
Description
Vehicle Security Camera
This invention relates to a vehicle security camera, which may be automatically triggered in an emergency to make a photographic record of for example a collision, or an attempted or accomplished break-in, or initiated by an occupant when an emergency is anticipated.
Such a device is intended to provide a photographic record to give prima-facie evidence of the cause and sequence of events in a collision, or the identity of an intruder, etc. A record of this kind may be for example of great value to police, civil courts and insurers in establishing the causes, sequence of evevts, and responsibility in accidents; and in the detection and prosecution of theives involved in car-related crime (theft- of or from motor vehicles) as well as in personal assaults on the occupants of vehicles. According to the invention, a vehicle security camera is adapted to be mounted in a vehicle so as to command an all- round view of the interior of the vehicle, and of the exterior of the vehicle through the vehicle windows, and includes one or more lenses adapted to give a wide field of view, the camera being operative automatically to take a plurality of exposures at predetermined intervals on activation, activation being by means for detecting the onset of an emergency, or by operation of a switch by an occupant of the vehicle.
The -camera may record the images magnetically or photo- chemically (by video tape or photographic film) and the record may comprise still or moving pictures.
The camera may have a plurality of so-called 'fish- eye' (very wide field) lenses, arranged to give complete coverage, with overlapping fields, and focus their respective images onto discrete areas of each frame of the recording medium (tape or film).
The camera may be of the disc kind, although roll film or cassette film with automatic wind-on may be used. The mechanism may be set to take exposures and wind-on at say 5 or 10 second intervals. The camera may use a flash unit, or compensate f.or poor light by automatic shutter regulation.
The camera may have a control unit which operates the shutter and wind-on mechanism, which is connected to impact sensors, as already used for operating electronically locked doors, and to sensors for detecting tampering with or forcing of doors or locks, as well as a push button switch operable by an occupant.
The camera is preferrably contained in a strong impact resistant casing, for example 1/4 inch stainless or mild steel- It may be mounted on the front ledge, rear shelf, or in or under the ceiling of the car saloon or vehicle cab.
A preferred embodiment of the invention will now be described by way of example with reference to the accompanying drawings, wherein:-
Fig. 1 is a perspective view of the exterior of the camera;
Fig. 2 is a cross-sectional diagrammatic view of the camera; and
Fig. 3 is a diagram showing possible alternative mounting positions for the camera in a saloon car.
As shown in Fig. 1, the camera is housed in a steel casing 10, of strong 1/4 inch stainless steel. A lens-holder dome 11 projects from the casing, and holds a plurality of
'fish-eye' lenses 12, with over-lapping fields of view. 'Fish -eye' lenses typically have fields of view of about 180°,' aιτd are used in security viewing devices such as door peep, .holes, and in all-sky cameras for astronomical or meteor- ological purposes. The casing 10 includes a key-slot 13 which accepts the vehicle ignition key to switch the camera 'on', in which state it is ready to be triggered, and Off; and three indicator lights, to indicate respectively that a new film, cartridge or disc is required (14), that the camera is 'live' (15), and an indicator that the camera has operated (16). An actuation button 17 is also provided to enable an occupant to trigger the camera.
Fig. 2 shows that the lenses 12 each focus onto a separate area of the frame 23 of sensitised film or other recording medium, carried here on a disc 22, which has a winding-on motor 21. The motor 21 is controlled by circuitry in a control unit 18, as is the camera shutter 24, and the control unit can be triggered to operate the camera by operation of the button 17, or by detection by an impact . detector (input leads 19), or of tampering with a door, e.g. with the lock, or attempted forcing (input leads 20).
The unit 18 operates the shutter 24 and the motor 21 to take a series of exposures, e.g. a programmed number at preset intervals, such as at 5 or 10 second intervals, which show the interior of the car and its surroundings through the windows. A photographic record will thus be obtained of for example the sequence of events in a collision, or an attempted or accomplished break-in, or of an assault on an occupant, whicfp will be useful in investigating traffic accidents, insurance claims, and identifying theives and assailants; and perhaps in evidence in civil and criminal proceedings.
The indicator lights function to indicate when a film disc is used up (14), that the device is 'live' and will operate if triggered (15), while light 16 will indicate that the camera has operated — e.g. if the vehicle has been left unattended, and there has been an attempted break-in or an unreported hit-and-run collision.
'The operation of the camera may be triggered by sensors for detecting body heat, or movement, which may be placed for example under the vehicle body, or below the engine bonnet andthus images of., people approaching the vehicle would be recorded. without any external indication. The control device 18 may be swithched On' and 'off* by a remote control \ device such as used for controlling televisions, so that the the owner may switch 'off the device as he approaches, thus avoiding needless accuation by an authorised approach and entry.
The camera may include a flash unit, or rely on a light meter and shutter speed and apperture control to compensate for poor light. If flash is used, its operation may act as a deterent to a theif, as may warning notices that the vehicle is equipped with the device.
The camera, is preferrably internally self powered, by dry cell or other suitable batteries, for security, and these batteries may be arranged to be recharged when the vehicle engine is running. Some possible alternative positions for the camera in a saloon car 30 are indicated in Fig. 3. On the front ledge 31 (position A), on the rear shelf 33 (position C) , or in or suspended from the ceiling 32 (position B) , are examples. These locations are not an exhaustive list, and other places may be used, and the best location for each type and model of vehicle may need to be determined by experiment.
The camera should have a high probability of surviving a serious collision, or vandalism, because of its robust casing. Steel is preferred to even the most robust of plastics as these will eventually crack through fatigue and chemical deterioration. ""'
At. a minimum, a single fish-eye or other ultra wide angle lens may be used as the camera objective, but the \- safeguard of a plurality of independantly imaged overlapping fields of view is preferred, particularly as one or more lenses may be obstructed or damaged by a colision or vandalism.
The lenses may be mounted remote from the camera body, fibre optic cables being used to transmit the images from the image planes to the recording medium. A magnetic recording medium, e.g. video tape, may be used instead of photo-chemical film, and be used to record discrete still images, or to provide a real-time or accelerated motion picture record Simultaneous sound recording may also be provided for, using magnetic tape to record the sounds :• __ arising during a collision, and/or conversation or other sounds made by intruders. Verbal comments made by intruders may give evidence of intent. The same tape may also record on a separate channel digitally coded information of date and time from a calender clock device, and data relating to the handling and performance of. the vehicle. This data may be processed and fed to the tape record by a microprocesser including suitably preprogrammed chips for data processing, storage and output.
Claims
1. A security camera for mounting in a vehicle so as to command an all-round view of the interior of the vehicle and of the exterior through the vehicle windows, including one or more lenses adapted to give a wide field of view, the camera being operated to automatically record a plurality of immages at pre-set intervals on activation, activation being by means for detecting the onset of an emergency, or by operation of a switch by an occupant of the vehicle.
2. A camera according to Claim 1, wherein the camera has an objective assembly comprising a dome having a plurality of fish-eye lenses, having their optical axes inclined eac.. to that of every other such lense in the assembly, arranged to give complete all-round coverage with overlapping fields and to focus their respective images onto respective discrete areas of the recording medium.
3. A camera according to Claim 1 or 2 wherein the camera is adapted to automatically operate its shutter, and wind on its film for a number of exposures on activation, activation being by means of detectors for sensing tampering, close approach of an intruder, or collision.
4. A camera according to any preceding Claim, wherein the recording medium is a photographic film.
5. A camera according to any preceding Claim, wherein the recording medium is a magnetic medium such as video tape.
6. A camera according to Claim 5 wherein the images are recorded as accelerated or real time motion pictures.
7. A camera according to any of Claims 1 to 6 wherein the images are recorded as a series of still pictures, at 5 to 10 second intervals.
8. A camera according to any" receding Claim, wherein provision is made for simultaneous recording of sound.
9. A camera according to Claim 8 wherein the tape used to record sound is also to record digital data such as date and time, etc processed by a suitably programmed microprocesser.
10. A camera according to any preceding claim, wherein the lenses are mounted away from the recording medium, and connected"thereto by fibre optics to transmit the focused images. 11 A security camera for mounting in a vehicle, substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8825446A GB8825446D0 (en) | 1988-10-31 | 1988-10-31 | Vehicle security camera |
GB8825446.1 | 1988-10-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990005076A1 true WO1990005076A1 (en) | 1990-05-17 |
Family
ID=10646054
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1989/001280 WO1990005076A1 (en) | 1988-10-31 | 1989-10-27 | Vehicle security camera |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU4493589A (en) |
GB (2) | GB8825446D0 (en) |
WO (1) | WO1990005076A1 (en) |
Cited By (37)
Publication number | Priority date | Publication date | Assignee | Title |
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WO1994027844A1 (en) * | 1993-05-28 | 1994-12-08 | Securtaxi Europa (Caixa Negra) - Alarmes Electrónicos, S.A. | Automatic security device for vehicles with tamper-proof recording of sounds and images |
ES2114816A1 (en) * | 1996-05-03 | 1998-06-01 | Urbano S A | Security system for transporting works of art. |
CN103370734A (en) * | 2011-02-14 | 2013-10-23 | 斯堪尼亚商用车有限公司 | Method and system for intrusion monitoring of a motor vehicle |
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US8880279B2 (en) | 2005-12-08 | 2014-11-04 | Smartdrive Systems, Inc. | Memory management in event recording systems |
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US8989959B2 (en) | 2006-11-07 | 2015-03-24 | Smartdrive Systems, Inc. | Vehicle operator performance history recording, scoring and reporting systems |
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US10904474B2 (en) | 2016-02-05 | 2021-01-26 | Digital Ally, Inc. | Comprehensive video collection and storage |
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US10964351B2 (en) | 2013-08-14 | 2021-03-30 | Digital Ally, Inc. | Forensic video recording with presence detection |
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Also Published As
Publication number | Publication date |
---|---|
GB8918897D0 (en) | 1989-09-27 |
GB8825446D0 (en) | 1988-11-30 |
GB2224358A (en) | 1990-05-02 |
AU4493589A (en) | 1990-05-28 |
GB2224358B (en) | 1992-02-26 |
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