WO2011025085A1 - Procédé et système de surveillance audiovisuelle combinée - Google Patents

Procédé et système de surveillance audiovisuelle combinée Download PDF

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Publication number
WO2011025085A1
WO2011025085A1 PCT/KR2009/005366 KR2009005366W WO2011025085A1 WO 2011025085 A1 WO2011025085 A1 WO 2011025085A1 KR 2009005366 W KR2009005366 W KR 2009005366W WO 2011025085 A1 WO2011025085 A1 WO 2011025085A1
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WO
WIPO (PCT)
Prior art keywords
module
video
input
triggering
location
Prior art date
Application number
PCT/KR2009/005366
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English (en)
Inventor
Jung-Jae Park
Yong-Soo Jang
Hyoung-Jin Park
Original Assignee
Axium Technologies, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Axium Technologies, Inc. filed Critical Axium Technologies, Inc.
Publication of WO2011025085A1 publication Critical patent/WO2011025085A1/fr

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    • 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
    • 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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0269—System arrangements wherein the object is to detect the exact location of child or item using a navigation satellite system, e.g. GPS
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/08—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using communication transmission lines
    • 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

  • the present invention relates generally to security devices, and more particularly to networked surveillance camera systems.
  • the present invention also relates to alarm and camera systems triggered with a combination of video and audio analysis.
  • surveillance systems are utilized for crime prevention, detection, and prosecution purposes.
  • Common locations where surveillance systems are utilized include banks, airports, casinos, parking lots and garages, parks, corporate facilities and the like, though increased availability has brought about its deployment in more private settings such as personal residences.
  • surveillance systems typically employ closed circuit television (CCTV) cameras that are connected to a central observation station with one or more video monitors.
  • CCTV closed circuit television
  • CCTV systems are intended for security personnel to constantly observe the monitors and respond to any incidents in real-time.
  • CCTV cameras may also be connected to video recording devices that archive footage for subsequent viewing, analysis, and other related uses.
  • VHS Video Home System
  • VCR Videocassette Recorders
  • IP network camera systems Like analog CCTV systems, cameras are installed in multiple locations, with the footage being viewable from the central monitoring station. The cameras have digital sensors, however, in which photons of light from each image or frame of video are converted to data representative of the same. This data is transmitted over a conventional data transfer link such as Ethernet. A minimalist video server may be incorporated into each of the cameras, and a remote client software application may communicate with each of the video servers to request video data for display. Because the networking protocols for IP network camera systems are the same as those utilized in standard computer networks, surveillance systems were able to use existing network infrastructure. Unlike analog CCTV systems, IP network camera systems do not have distance limitations, and because a large volume of data can be stored with relative ease on hard disk drives, optical discs, and other such media, the burdens previously associated with access and management of surveillance footage is greatly reduced.
  • surveillance cameras Regardless of the scope of deployment, surveillance cameras largely remain a tool for after-the-fact reconstruction of an incident for investigation and prosecution purposes rather than a proactive prevention of the same. While the visibility of cameras and the widespread knowledge of the existence of ongoing surveillance may have some deterrent effect against criminal or otherwise legally actionable activity, early detection and response thereto may not be possible. As another example, despite the installation 4.2 million cameras in the United Kingdom, the 2005 subway bombings could not be prevented, resulting in 56 deaths and over 700 injuries.
  • the primary limitation in this regard is the inability of human beings to sustain the necessary concentration levels for extended periods of time. Studies have shown that after twenty minutes of watching live surveillance footage, up to 90% of the information being shown will be missed. Monitoring abilities further deteriorate as the number of cameras is increased.
  • a surveillance system for monitoring a location.
  • the system may include an audio module having an audio input connected to an acoustic transducer.
  • the acoustic transducer may be receptive to environmental sound signals from the monitored location.
  • the surveillance system may include a video module with a video input connected to an imaging sensor.
  • the imaging sensor may be receptive to visual events from the monitored location.
  • There may also be a central processor that is connected to the audio module and the video module.
  • the central processor may be programmable to generate an alert signal based upon a concurrent detection of an environmental sound signal and a visual event. This environmental sound signal and visual event may be associated with a triggering incident.
  • a method of surveillance of a location for triggering events may include receiving an input audio signal of the location, and receiving an input video stream of the location.
  • the method may also include detecting a specific one of the triggering events based upon the input audio signal matching a predefined sonic signature. Additionally, the detecting of the specific one of the
  • triggering events may be based upon the input video signal matching a predefined image sequence.
  • the predefined sonic signature and the predefined image sequence may be associated with the specific one of the triggering events.
  • the method may further include generating an alarm in response to the detection of the specific one of the triggering events.
  • the method may include transmitting the input audio signal, the input video stream, and the alarm to a remote monitor.
  • a surveillance system and a method for monitoring a location have an advantage generating alarm when the audio module and the video module detect the triggering event.
  • FIG. 1 is an illustration of an exemplary environment in which a surveillance system of the present invention is deployed
  • FIG. 2 is a block diagram of the various components of one embodiment of the surveillance system, including multiple surveillance camera units, networking components, and a remote monitoring station;
  • FIG. 3 is a block diagram of the components of the surveillance camera unit
  • FIG. 4 is a flowchart illustrating the steps for one embodiment of a method of surveillance
  • FIG. 5 is a flowchart illustrating the steps involved in receiving the input audio and detecting the triggering event therefrom.
  • FIG. 6 is a flowchart showing an execution flow following the detection of the triggering event in accordance with various embodiments of the present invention.
  • FIG. 1 shows an exemplary environment 10 in which a surveillance system of the present invention may be installed and deployed.
  • the environment 10 includes a building 12 that is located on a street corner.
  • a parking lot 18 As part of its security arrangements, these various locations are monitored by surveillance camera units 20.
  • the parking lot 18 is monitored by a first camera unit 20a in order to monitor, for example, potential carjackings, assault, robberies, vehicle vandalism, and so forth.
  • the entrance 14 is monitored by a pair of second and third camera units 20b, 20c, respectively, to track the people entering and exiting the building 12.
  • the side entrance 16 is monitored by a fourth camera unit 20d to track vehicles and their license plates approaching the gate for access.
  • the surveillance camera units 20 may be installed in different places in the environment 10 for a variety of purposes.
  • location is understood to refer generally to the environment 10 that is being monitored with the surveillance system of the present invention.
  • location is also understood to refer to specific segments of the environment 10 that is being monitored by a specific one of the surveillance camera units 20.
  • different surveillance camera units 20 may also be referred to by the particular installation location, e.g., the first surveillance camera unit 20a that covers the parking lot 18 may also be referred to as the parking lot camera unit.
  • the surveillance system 1 includes one or more surveillance camera units 20 that are positioned throughout various locations in the environment 10 to record video footage therefrom.
  • the parking lot camera unit 20a, the left front door camera unit 20b, the right front door camera unit 20b, the left front door camera unit 20c, and the side entrance camera unit 20d are connected to an internal network 22.
  • the surveillance footage recorded by the surveillance camera units 20 may be transmitted to and displayed on a remote monitoring station 24 that is manned by security personnel.
  • the remote monitoring station 24 is likewise connected to the internal network 22.
  • the actual location of the remote monitoring station 24 need not be limited to within the building 12. Monitoring services performed by the security personnel may be outsourced to third party providers otherwise unaffiliated with the management of the building 12, and may also be remotely located from the same.
  • the internal network 22 is contemplated to be a Transmission Control Protocol/Internet Protocol (TCP/IP) network that can be interconnected to other systems on the Internet.
  • TCP/IP Transmission Control Protocol/Internet Protocol
  • Data traffic from each of the surveillance camera units 20 may be aggregated by a hub or switch 26 that similarly complies with the TCP/IP standards of the internal network 22.
  • the use of the TCP/IP network in this context is by way of example only, as many existing networked camera devices are compliant therewith. Other networking standards may, however, be substituted without departing from the present invention.
  • the remote monitoring station 24 may be a conventional desktop computer having a central processing unit, memory, and input and output devices connected thereto such as keyboards, mice, and display units 28.
  • the remote monitoring station 24 is understood to have software instructions loaded thereon that, when executed, perform various functions involved with accessing and displaying footage from the surveillance camera units 20.
  • the surveillance camera unit 20 functions as a server, as the term is understood in relation to the TCP/IP internal network 22.
  • the remote monitoring station 24 thus functions as a client requesting data from the server. With a communications link established between the surveillance camera unit 20 and the remote monitoring station 24, however, upon the automated detection of certain events, the surveillance camera unit 20 may notify the remote monitoring station.
  • the remote monitoring station 24 includes a web browser application such as Internet Explorer from Microsoft Corporation of Redmond, Washington, or Firefox from the Mozilla Foundation.
  • the surveillance camera units 20 are understood to have basic versions of a HyperText Transfer Protocol (HTTP) server and a video streaming server.
  • HTTP HyperText Transfer Protocol
  • video streaming server Via plug-in modules supplementing the functionality of the web browser application with media playback features, data from the video streaming server is processed and displayed on the remote monitoring station.
  • the remote monitoring station 24 is loaded with a dedicated video feed display application such as Maximum® from Axium Technologies, Inc. of Irwindale, California.
  • the video streaming servers of the surveillance camera units 20 communicate directly with such a display application to deliver the recorded surveillance footage.
  • the display 28 may be segregated into four subsections 28a-d, corresponding to each of the surveillance camera units 20a-d in the system 1.
  • a variety of other layouts that conveniently show the different feeds are also envisioned, along with the interactive features that may direct the operation of the surveillance camera units 20.
  • the surveillance camera unit 20 in accordance with one embodiment of the present invention includes an audio module 30, a video module 32, and a central processor 34.
  • the audio module 30 is connected to an acoustic transducer 36 or microphone, which generates an analog electrical signal of the sound from the monitored location. The analog electrical is then converted to a digital representation by an analog-to-digital converter (ADC) 38.
  • ADC 38 may be incorporated into the audio module 30.
  • the ADC 38 may be a separate, standalone component as shown in the block diagram of FIG. 3.
  • the video module 32 is connected to a video camera 40, which in its most basic form includes a sensor that converts photons of light striking it into a representative
  • the photons of light are understood to be reflections from the pertinent scene of the monitored location. Any suitable video camera having various lenses, adjustable apertures, and sensor types and resolutions may be utilized.
  • the present invention also contemplates a method of surveillance.
  • the method begins with a step 200 of receiving an input audio signal of the specific location in the environment 10.
  • the step 200 of receiving the input audio signal and the step 202 of receiving the input video stream may occur simultaneously, as the operation of the microphone 36 and the audio module 30 are not exclusive of the operation of the video camera 40 and the video module 32.
  • the method continues with a step 204 of detecting a triggering event based upon such signals. The processing of the audio signal and of the video stream will be described in turn, below.
  • the flowchart of FIG. 5 best illustrates the further detailed steps involved with receiving the audio signal and detecting the triggering event.
  • the analog audio signal is acquired from the monitored environment 10 by the acoustic transducer 36, indicated as step 300. This step is understood to correspond generally to step 200 above.
  • the ADC 38 converts the analog signal to a digital representation.
  • the converted digital representation is then fed to the audio module 30 in accordance with step 304, and is analyzed to determine whether the recorded sound signal matches any predefined sonic signature in step 306.
  • the predefined sonic signature is understood to be a reference sample of a sound associated with the triggering event.
  • triggering events include vehicle collisions, firearm discharge, graffiti vandalism, assault, robbery, burglary and the like.
  • vehicle collisions may have a number of corresponding sounds such as breaking glass, skidding rubber, and crumpling sheet metal.
  • a firearm discharge may include a sound of the explosion of gunpowder and the crack of the bullet reaching supersonic speeds.
  • Graffiti vandalism may have a spray paint can discharge sound, as well as a sound associated with the agitator rolling around within the can.
  • burglary or other crimes necessitating the destruction of entry barriers are typically accompanied by sounds of breaking glass and similar impacts.
  • the predefined sonic signature for each of aforementioned trigger events may be stored for access by the audio module 30.
  • the surveillance camera unit 20 may include a memory module 42 for this purpose. Because the predefined sonic signatures may be stored for subsequent retrieval even when the surveillance camera unit 20 is powered off, the use of a non-volatile memory device such as Flash is envisioned. Further, because updates of the predefined sonic signatures can be provided, the memory module 42 may be removable, such as a Secure Digital (SD) card.
  • SD Secure Digital
  • the input audio signals are from a live environment, so there are many superfluous sounds that may be mixed in with the sounds of interest.
  • the input audio signal is understood to have a triggering event component that is the sound of interest, and a background noise component that, to increase accuracy, must be minimized.
  • the level of the background noise component is normalized to that of earlier recorded background noise components that, in hindsight, did not include the triggering event component.
  • a large sampling of the earlier recorded background noise components may be utilized to build an accurate representation of the noise characteristics for the particular location being monitored in the environment 10. Because different points throughout the day, different days of the week, and different months may have different noise characteristics, each such time division may have its own noise normalization levels. This profiling of noise is therefore understood to be intelligent and self-educational.
  • the audio module 30 compares the input audio signal and the predefined sound signature to determine whether the triggering event occurred.
  • various digital signal processing (DSP) algorithms may be utilized to determine the degree of similarity.
  • SIMD single instruction multiple data
  • the method of surveillance includes the step 204 of detecting the triggering event.
  • the footage captured by the video camera 40 is evaluated by the video module 30 for particular events that may be unfolding.
  • the evaluation procedure is understood to be built upon several basic image processing algorithms that involve an analysis of a sequence of image frames of the input video stream, so a DSP device may be utilized. It is possible to utilize two independent devices for the audio module 30 and the video module 32, but it is also contemplated that a single device may perform both functions.
  • the exact circuit implementation is not intended to be limiting.
  • the video module 30 may utilize the OnBoardTM Application Programming Interface (API) from ObjectVideo, Inc. of Reston, VA, though any other video analytics libraries may be substituted.
  • API OnBoardTM Application Programming Interface
  • the video module 32 is capable of differentiating between different objects that may appear, including people, vehicles, and other items such as luggage. When such objects cross over a predefined boundary, a tripwire event notification may be generated. Further sophisticated analyses are possible with a second predefined boundary, and various rules relative to the first boundary may be defined.
  • another event notification may be generated. Similar to the enter or exit event, the video module 32 is capable of detecting when an object appears or disappears from an area of interest without first appearing or subsequently disappearing, respectively, from the periphery. When objects are taken away or left behind, another event notification may be generated. In order to reduce the possibility of false positives, the video module 32 may include the ability to filter out objects that are too small or too large, objects that change size or shape too rapidly.
  • a particular sequence of events detected from the surveillance footage by the video module 32 are understood to be representative of a specific triggering event such as a vehicle crash, a theft, an assault, a robbery, and the like.
  • a vehicle crash e.g., a vehicle is observed crossing a second tripwire before a first tripwire when normal flow of traffic should be the opposite, then it can be determined that the vehicle is travelling in the wrong direction.
  • an object is left behind, there is a possibility that it could contain dangerous explosives with the potential to cause serious harm, whereas when an object normally within the area of interest suddenly disappears, it may have been stolen.
  • people Prior to committing a crime, people tend to loiter in a location to conduct reconnaissance and/or to pick a suitable victim, though it is just as likely for people to loiter when waiting for someone to arrive.
  • an notification to that effect is provided to the central processor 34.
  • Various embodiments of the present invention contemplate different ways to proceed based upon the sequence in which the notification from the audio module 30 and the video module 32 are received. It is envisioned that such functionality reduces the need for constant human monitoring, and only when potential events are identified, is human monitoring and action necessary.
  • FIG. 6 is a flowchart illustrating one possible execution flow. Beginning with step 400a, which generally corresponds to step 200 above, the input audio signal is received. Further, step 400b, which generally corresponds to step 202 above, the input video stream is received. In steps 410a and 410b, a triggering event is detected by the respective one of the audio module 30 and the video module 32. These two steps are understood to correspond to step 204 above.
  • the triggering events detected by the audio module 30 and the video module 32 may be based off the same occurrence in the monitored location, and if so, the two will generate its respective event notifications to the central processor 34 at the same time. If the event notifications are not based off the same occurrence, the notifications will generally be received at different times. This evaluation is made in decision branch 420.
  • the method of surveillance shown in the flowchart of FIG. 4 continues with a step 206 of generating an alarm in response to the received event notifications.
  • a step 206 of generating an alarm in response to the received event notifications is only if the notifications are concurrently received, does the central processor 34 generates an alarm signal according to corresponding step 430.
  • GPS Global Positioning Satellite
  • the surveillance camera unit 20 includes a GPS receiver 44 that is connected to the central processor 34.
  • the acquisition of GPS coordinates is well known in the art, and a further description of the same will be omitted.
  • the GPS coordinates are incorporated into the alarm signal according to step 429.
  • the central processor 34 transmits the alarm signal to the remote monitoring station 24 per step 432.
  • the surveillance camera unit 20 includes a network communications module 46 that establishes a data transfer link to the remote monitoring station 24 over the internal network 22.
  • the internal network 22 is a TCP/IP network, with the physical cabling being Ethernet. Therefore, the network communications module 46 is understood to include ports to which Ethernet cables can be connected. Alternative network communications modalities such as WiFi may also be utilized, however, and in which case the network communications module 46 would include a wireless transceiver.
  • step 434 the recorded input video stream and the input audio signal may also be transmitted to the remote monitoring station 24 in accordance with step 434. Similar to the transmitted alarm signal, this data is transmitted by the network communications module 46. Together with the transmission of the alarm signal in step 432, step 434 generally corresponds to a step 208 of transmitting the input audio signal, the input video signal, and the alarm signal to the remote monitoring station 24 as shown in the flowchart of FIG. 4.
  • the data can be stored in the memory module 42 for backup purposes according to step 436.
  • the memory module 42 may be a portable device that can be removed from the surveillance camera unit 20.
  • devices attached to a peripheral port 48 may be activated in step 438 after the alarm signal is generated, that is, when the triggering event is detected by both the audio module 30 and the video module 32.
  • Exemplary devices that may be connected to the peripheral port 48 include floodlights or strobe lights, as well as alarm sound generators. Such devices may provide a startling effect to a perpetrator, and direct the attention of nearby security personnel. It will be appreciated that any other suitable device may be so triggered by the central processor 34.
  • the central processor 34 simply generates an event signal per step 440, and transmits the same in step 442.
  • the notification may be recorded by the remote monitoring station 24 that there was a possible detection of a triggering event from either an input audio signal or an input video stream, and the display 28 may indicate as such.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Child & Adolescent Psychology (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Health & Medical Sciences (AREA)
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  • Radar, Positioning & Navigation (AREA)
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  • Closed-Circuit Television Systems (AREA)
  • Studio Devices (AREA)

Abstract

L'invention porte sur un système et sur un procédé de surveillance destinés à surveiller un emplacement. Un module audio connecté à un transducteur acoustique reçoit un signal audio d'entrée, et détecte des éléments déclencheurs sur la base d'une correspondance de ceux-ci avec une signature. En outre, un module vidéo connecté à une caméra vidéo reçoit un flux d'entrée, et détecte des événements déclencheurs au moyen d'une analytique de vidéo. Une alarme est générée lorsque le module audio et le module vidéo détectent l'élément déclencheur.
PCT/KR2009/005366 2009-08-25 2009-09-21 Procédé et système de surveillance audiovisuelle combinée WO2011025085A1 (fr)

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US12/547,421 2009-08-25

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