Patent Publication Number: US-2006007308-A1

Title: Environmentally aware, intelligent surveillance device

Description:
This application is a continuation-in-part of U.S. patent application entitled “Environmentally Aware, Intelligent Surveillance Device,” filed Jul. 12, 2004, and assigned Ser. No. 10/889,224, the disclosure of which is incorporated herein by reference in its entirety.  
      This application also claims the benefit, pursuant to 35 U.S.C. §119(e), of U.S. Provisional Patent Application entitled “ENVIRONMENTALLY AWARE, INTELLIGENT SURVEILLANCE DEVICE,” filed on Jul. 11, 2003, and assigned Ser. No. 60/486,766, the disclosure of which is incorporated herein by reference in its entirety.  
      The applicant expressly reserves the right to claim priority to U.S. patent application Ser. No. 10/676,395 filed Oct. 1, 2003, entitled “SYSTEM AND METHOD FOR INTERPOLATING COORDINATE VALUE BASED UPON CORRELATION BETWEEN 2D ENVIRONMENT AND 3D ENVIRONMENT,” the disclosure of which is incorporated herein by reference in its entirety.  
     CROSS-REFERENCE TO RELATED APPLICATIONS  
      This application is related to co-pending U.S. patent application Ser. No. 10/236,720 entitled “Sensor Device for use in Surveillance System” filed on Sep. 2, 2002; co-pending U.S. patent application Ser. No. 10/236,81  9  entitled “Security Data Management System” filed on Sep. 6, 2002; co-pending U.S. patent application Ser. No. 10/237,202 entitled “Surveillance System Control Unit” filed on Sep. 6, 2002; and co-pending U.S. patent application Ser. No. 10/237,203 entitled “Surveillance System Data Center” filed on Sep. 6, 2002, the disclosures of which are all entirely incorporated herein by reference.  
    
    
     TECHNICAL FIELD  
      The present invention is generally related to remote monitoring and sensing, and is more particularly related to a remote deployable, stand-alone, environmentally aware surveillance sensor device that is capable of self-determining its location and orientation relative to a real world, three-dimensional (3D) environment, detect conditions or events within the sensor&#39;s range of detection within that environment, and provide event information indicative of detected conditions or events including their location relative to the 3D real world environment as well as the raw sensor data feed, to an external utilization system such as a security monitoring system.  
     BACKGROUND OF THE INVENTION  
      Currently, many video cameras or video-type sensors are not environmentally aware. Numerous existing video processing systems do not produce results that correlate to real world coordinate systems. Further, current video processing systems that have the capability to output event data require several devices to accomplish such a function (e.g., a camera, a computer and other data processing devices must be utlized along with substantial manual configuration in order to produce event data in real world coordinate systems).  
      It is necessary to use environmental location information as a foundation for the integration of security data to assist in the fusing and integration of event and video data in order to provide security information. The environmental location information is the primary source that aids in the development of situational awareness. Many video surveillance systems do not have the functional capabilty to fuse disparate information into a single situational awareness framework. While there are systems that do have this capability, they are either highly expensive, custom built systems or they require substantial manual configuration in order to create environmental location data for video information.  
      By integrating disparate technologies into a single device, an environmentally aware video sensor can use automated algorithms coupled with publicly available data sources (i.e., global positioning system (GPS) data, atomic clock signals, etc . . . ) to maintain state data of the environment that is being monitered by the surveillance device. The acquired environmental state data can be used by vision processing algorithms to produce a stream of event data in terms of a real world coordinate system that is output directly from the surveillance device.  
     SUMMARY OF THE INVENTION  
      The invention relates to methods and systems that utilize an environmentally aware surveillance device, wherein the surveillance device uses video technology to observe an area under surveillance and processes video (or any other media that records, manipulates or displays moving images) to produce outputs including streaming video as well as a stream of deduced event data. The event data may include facts about what was observed in the area under surveillance, where it was observed in the area under surveillance and when it was observed in the area undersurveillance, wherein the data is consistent from surveilled event to event.  
      An embodiment of the present invention comprises an environmentally aware surveillance device, wherein the device comprises a surveillance sensor for detecting objects within an area under surveillance. The environmentally aware surveillance device further comprises an environmental awareness means that is operative to self-determine the position and orientation of the surveillance sensor relative to a real world spatial coordinate system, for associating a position of an object detected by the surveillance sensor with respect to the real world spatial coordinate system, and for generating an event information output corresponding to the detected object and associated position. An output port provides event information to an external utilization system.  
      Another embodiment of the present invention comprises a self-contained stand alone environmentally aware surveillance device that is operative to provide event information as an output. The surveillance device comprises a surveillance sensor that provides event data of objects in an area under surveillance that are detected in an area under surveillance. A time circuit determines the time the surveillance events provided by the surveillance sensor were detected and a position information source self-detects the physical location of the surveillance device in a geographic coordinate system.  
      Other aspects of the surveillance device include a sensor orientation source that is operative for detecting the relative position of the surveillance sensor with respect to the geographic coordinate system. A processor is responsive to signals from the surveillance sensor, the clock receiver, the position sensor and the sensor orientation sensor, wherein the signals are processed and in response event information is generated that corresponds to a detected event that is detected by the sensor. The event information comprises attributes of objects identified by the surveillance signals, time information, and position information with respect to a detected event in an area under surveillance. Further, an output port is utilized to provide the event information for external utilization.  
      A further embodiment of the present invention comprises an environmentally aware sensor for a surveillance system. The sensor comprises a video sensor for providing video signals detected in the field-of-view of an area that is under surveillance. A global positioning system receiver is also implemented, wherein the receiver obtains position information from a global positioning system that is relative to a geographic coordinate system. The sensor also comprises an inertial measurement unit that detects the relative position of the video sensor and a camera lens situated on the video sensor, the camera lens having predetermined optical characteristics.  
      Additional aspects of the present embodiment include a clock receiver that receives and provides time signals. A computer processor that is responsive to signals from the video sensor, position signals from a position information source receiver, position signals from the orientation information source receiver, time signals from the clock receiver, and predetermined other characteristics of the sensor, executes predetermined program modules. A memory that is in communication with the processor stores the predetermined program modules for execution on the processor utilizing the video sensor signals, position information source position signals, orientation information source signals and the time signals.  
      The processor is operative to compute stored program modules for detecting motion within the field-of-view of the video sensor and detect an object based on the video signals in addition to tracking the motion of the detected object. The processor further classifies the object according to a predetermined classification scheme and provides event record data that comprises object identification data, object tracking data, object position information, time information, and video signals associated with a detected objected. The tracked object is correlated to a specific coordinate system. Thereafter, an object that has been identified and tracked is mapped from its 2D location in a camera frame to a 3D location in a 3D model. A data communications network interface for provides the event record data to an external utilization system.  
      An additional embodiment of the present invention comprises an environmentally aware video camera. The video camera monitors an area under surveillance (AUS) and provides for video output signals of the AUS. An environmental awareness means is featured, wherein the environmental awareness means is operative to self determine the position, orientation, and time of the video camera relative to a real world spatial and temporal coordinate system, and for generating event information corresponding to the position and time of the AUS by the video camera. Further, an output port provides the event information and video signals to an external utilization system.  
      A yet another embodiment of the present invention comprises an environmentally aware sensor system for surveillance. The system comprises a video sensor that provides video signals that correspond to a field-of-view of an area under surveillance and a computer processor. A position information input is utilized in order to receive position signals that are indicative of the location of the system with respect to a real world coordinate system, additionally an orientation information input is provided for receiving orientation signals that are indicative of the orientation of the video sensor relative to the real world coordinate system. Program modules are operative to execute on the computer processor, the modules including a video processing module for detecting motion of a region within the field-of-view of the sensor; a tracking module for determining a path of motion of the region within the field-of-view of the sensor; a behavioral awareness module for identifying predetermined behaviors of the region within the field-of-view of the sensor; and an environmental awareness module responsive to predetermined information relating to characteristics of the video sensor, said position signals, and said orientation signals, and outputs from said video processing module, said tracking module, and said behavioral awareness module, for computing geometric equations and mapping algorithms, and for providing video frame output and event record output indicative of predetermined detected conditions to an external utilization system.  
      A yet further embodiment of the present invention comprises a method for determining the characteristics of an object detected by a surveillance sensor in an AUS. The method comprises the steps of self determining the position, orientation, and time index of signals provided by the surveillance sensor, based on position, orientation, and time input signals, relative to a predetermined real world spatial and temporal coordinate system and detecting an object within the AUS by the surveillance sensor. Lastly, the method provides event information to an external utilization system, the event information comprising attributes of objects identified by the surveillance signal from the surveillance sensor, information corresponding to attributes of the detected object, and position information associated with the detected object relative to the predetermined real world spatial and temporal coordinate system.  
      A yet another embodiment of the present invention comprises a method for providing object information from a sensor in a security-monitoring environment for utilization by a security monitoring system. The method comprises the steps of placing an environmentally aware sensor in an AUS, the sensor having a range of detection and predetermined sensor characteristics, and inputs for receipt of position information from a position information source and orientation information from an orientation information source and at the environmentally aware sensor, self determines the location of the sensor relative to a 3D real world coordinate system based on the position information and the orientation information. Further, the method determines the 3D coordinates of the area within the range of detection of the environmentally aware sensor based on the predetermined sensor characteristics and the determined location of the sensor and detecting an object within the range of detection of the environmentally aware sensor. The 3D location of the detected object within the range of detection of the environmental sensor is determined and the location of the detected object is provided, identifying information relating to the detected object, and a data feed from the environmental sensor to the external security monitoring system.  
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      The accompanying drawings illustrate one or more embodiments of the invention and, together with the written description, serve to explain the principles of the invention. Wherever possible, the same reference numbers are used throughout the drawings to refer to the same or like elements of an embodiment, and wherein:  
       FIG. 1  illustrates an area under surveillance as would be monitored by an environmentally aware surveillance device constructed in accordance with embodiments of the present invention.  
       FIG. 2  illustrates a camera 2D view and a 3D model of an area under surveillance that is facilitated by use of an environmentally aware surveillance device that is constructed in accordance with the present invention.  
       FIG. 3  illustrates an aspect of the mounting of a surveillance device in accordance with the invention, including an aspect for mapping a 2D image to a 3D model.  
       FIG. 4  illustrates a process flow for data captured by a camera to a 3D model.  
       FIG. 5  illustrates system components of an environmentally aware surveillance device constructed in accordance with embodiments of the present invention.  
       FIG. 6  is a flow chart of a computer-implemented process employed in an aspect of an environmentally aware surveillance device constructed in accordance with embodiments of the present invention.  
       FIG. 7  illustrates an embodiment of an environmentally aware survelleilance device and various external information sources that are utilized within embodiments of the present invention.  
       FIG. 8  illustrates an environmentally aware surveillance system and the components for an environmentally aware surveillance device constructed in accordance with embodiments of the present invention.  
       FIG. 9  illustrates aspects of a basic lens equation that can be used within embodiments of the present invention.  
       FIG. 1   0  illustrates aspects of the lens equation plus other aspects and/or parameters of the mounting of an environmentally aware surveillance device constructed in accordance with embodiments of the present invention.  
       FIG. 11  illustrates a method for determining the characteristics of an object detected by a surveillance sensor in an area under surveillance that relates to embodiments of the present invention.  
       FIG. 12  illustrates yet another method for providing object information from a sensor in a security monitoring environment for utilization by a security monitoring system that relates to embodiments of the present invention. 
    
    
     DETAILED DESCRIPTION  
      One or more exemplary embodiments of the invention are described below in detail. The disclosed embodiments are intended to be illustrative only since numerous modifications and variations therein will be apparent to those of ordinary skill in the art. In reference to the drawings, like numbers will indicate like parts continuously throughout the views.  
     DEFINITION OF TERMS  
      Area Under Surveillance—an area of the real world that is being observed by one or more sensors.  
      Camera Sensor—a device that observes electromagnetic radiation and produces a two-dimensional image representation of the electromagnetic radiation observation.  
      Camera Image Frame—a two-dimensional image produced by a camera sensor.  
      2D Location—a location in a camera image frame; also referred to as screen coordinates as a camera image frame is frequently displayed on a video screen.  
      Video Sensor—a camera sensor that makes periodic observations, typically having a well-defined observation frequency that produces video output.  
      Video Output—a sequence of camera image frames, typically having been created at a well-defined observation frequency.  
      Event—an event is a logical representational indicator denoting that someone, something, or some sensor observed an happening, occurrence, or entity that existed at a point in time at a particular location. The event is distinct and separate from the actual happening that occurred. The particular incident may have been observed by multiple observers, each observer having a different perspective of the incident. Since the observers can have different perspectives of the incident each observer may notice different or conflicting facts in regard to the incident.  
      Event Information—event information describes characteristics that are determined by an observer that pertain to the event including but not limited to accurate, real world coordinates that have occurred at accurate, real world points in time. Event information is also called event data.  
      Event Record—an event record is an information record that is created to detail important event information for detected events that occur within an area under surveillance.  
      Object—an object is an entity that can be observed by a sensor that exists at a set of physical positions over a time period, regardless of whether the positions of the object change over time or not.  
      Detected Object—An object, typically a moving object, which has been observed by a sensor whose positions over time are stored as an object track.  
      —Moving Object—an object whose position changes over time.  
      Object Track—an object track is a set of event records where each event record corresponds to the position of an object within area of surveillance observed by a sensor over a specific period of time.  
      Three-dimensional model—a three dimensional model of an area under surveillance having a well-defined coordinate system that can be mapped to a measurable or estimated coordinate system in the real world by a well-defined mapping method.  
      Three-Dimensional Information—event information where the position of the represented object is described in terms of the coordinate system used in a three-dimensional model.  
      Position Information Source—position information source describes sources of location information that are used to assist in the implementation of location the environmental awareness functionality of the present invention. Examples of sources for position information include but are not limited to position sensors, GPS devices, a geographic position of a person or object, conventional surveying tools, Graphical Information System databases, information encoded by a person, etc.  
      Orientation Information Source—sources of orientation information that are used to assist in the implementation of orientation of the environmental awareness functionality of the present invention. Examples of sources for orientation information include but are not limited to orientation sensors, inertial measurement units (IMU), conventional surveying tools, information encoded by a person, etc.  
      Self-Determine—self-determine means using the methods and information sources used in the patent application, including the use of information from external sources, sensors and in some cases operators.  
      Environmental Location Information—information about the location of objects with respect to a known real-world coordinate system.  
      Situational Awareness Framework—a three-dimensional model of an area under surveillance to which detected object locations are mapped for a given area under surveillance.  
      System Overview  
      The term environmental awareness as presently used to describe the functions of the present invention, is defined as a surveillance device that has the capability to accurately and automatically determine the position, orientation and time index with respect to the real world for the device and the area under surveillance by the device. The environmental awareness of a surveillance device may be determined automatically by the device through the use of a combination of automatic sensing technologies in conjunction with a plurality of pre-programmed algorithms and device characteristics. The surveillance device utilized in conjunction with the present invention can include but are not limited to video cameras, audio listening devices, sonar, radar, seismic, laser implemented, infrared, thermal and electrical field devices.  
      The environmentally aware, intelligent surveillance device of the present invention observes objects, detects and tracks these objects, finds their two-dimensional (2D) location in a camera image frame, and thereafter determines the 3D location of those objects in a real-world coordinate system. In order to do this, the invention must take external inputs from the world and from external systems, wherein the inputs are described in further detail below.  
      Utilizing the environmental awareness capabilities, a device may identify moving or stationary objects within an environmental sensor&#39;s area of surveillance and as a result produce event information describing characteristics of the identified object in accurate, real world coordinates that have occurred at accurate, real world points in time. Identified characteristics can include position, type, speed, size and other determined relevent object characteristics. Sections of an area under surveillance may provide differing levels of interest wherein some sections may be evaluated to be of a level of higher interest than other areas. Embodiments of the present invention process information that defines such areas of interest by way of data that is obtained either manually or from an external system.  
      The enhanced environmentally awareness capabilities of the present invention allow the invention to determine the position of observed objects in accurate, real world coordinates in addition to determining the time the objects were observed in accurate, real world time. These environmental awareness characteristics may be provided to the device from external sources such as a position information source provider, an international time services provider or by internal sensing devices such as intertial measurement units (e.g., gyroscopes).  
      Components that may be utilized within embodiments of the present invention to facilitate the evironment awarness functinality of the present invention include but are not limited to: a position information source, an inertial measurement unit (IMU) comprising gyroscopes and accelerometers or other technology that is functionally equivalent and able to determine 3-dimensional orientation and movement, camera lens (the cameralens having known focal length or zoom with focal length feedback provided by a lens position sensor, e.g. see  FIG. 8 ), a video sensor (e.g., either a digital video sensor or a frame grabber used in conjuntion with an analog video sensor that produces video signals), a clock receiver (or equivalent date and time source), a computer processor, a computer memory, a TCP/IP network interface card, video processing algorithm means, geometric mapping algorithm means and a video frame grabber. Lenses used within embodiments of the present invention may be manually or automatically focused in addition to manual aperture control or automatic control. Further, the lenses may have manual zoom (control of focal length) or automatic zoom along with a short or long depth of field.  
      Currently, there are many different coordinate systems that are utilized to provide coordinate data. The present invention may create security event data in terms of a specific prevailing global coordinate system. The present invention also allows for the selection of a primary coordinate system, wherein all event data processed within the invention may be delivered in terms of this coordinate system. A system operator or manufacturer may also be able to select a coordinate system from various coordinate systems that may be utilized in conjunction with the present invention. Alternative embodiments of the present invention that use different coordinate systems and create output events in terms of multiple coordinate systems, or that provide conversions or conversion factors to other coordinate systems are additionally provided as aspects of the alternative embodiments.  
      Further, an enviromentally aware sensor device may have the capability to be self-configuring by utilizing a combination of data that is automatically available from external sources, from internal sensing devices, pre-configured device characteristics and intelligent sensor analysis logic that is at the disposal of the device. Additionally, if necessary, the environmentally aware sensor device may be configured by a system operator via either a graphical user interface displayed at a work station console or a web browser.  
      Embodiments of the present invention may perform further aspects such as vision processing by using predetermined algorithms to carry out tasks such as as image enhancement, image stabilization, object detection, object recognition and classification, motion detection, object tracking, object location and object location. These algorithms may use environmental awareness data and may create an ongoing stream of security event data. Event records can be created for important detected security events that occur within the area under surveillance. An event record may contain any and every relevant fact about the event that can be determined by the vision processing algorithms.  
      In order to provide the consistency of data in regard to events relating to the same physical object or phenomenon within the AUS, device state data can be maintained by the device, wherein acquired state data can be compared and combined during an external analysis. Generated event data may be published in an open format (e.g., XML) in addition to or along with an industry standard output (e.g., such as MPEG standards define). Each event record may by time-synchronized in accordance with the video signal input that was processed to determine the event.  
      Environmental awareness data that is acquired by the present invention (such as position, angle of view (3D), lens focal length, etc . . . ) evaluated in conjunction with coordinate mapping models to convert observed event locations from 2D sensor coordinates into accurate 3D events in a real world coordinate system. Since various coordinate systems are utilized within the present invention, the coordinate systems used within the present invention may be configurable or selectable at the discretion of a system operator.  
      A further aspect of embodiments of the present invention is the capability of the present invention to produce video data in digital or analog form. Video data may be time-synchronized with security event data that is also produced by the present invention. This capability allows in particular instances for external systems to synchronize their video processing or analysis functions with event data that is produced by the present invention. Input/output connections are also provided for embodiments of the present invention. The input/output connections may include, but are not limited to, connections for analog video out, an Ethernet connection (or equivalent) for digital signal input and output and a power in connection.  
      Within embodiments of the present invention, the computer processor may accept position input data from a position information source and orientation input data from an orientation information source. The processor may combine this input data with the lens focal length, acquired video sensor information in addition to user configuration information to modify the geometric mapping algorithms that may be used within the present invention. The resultant processed environmental awareness data may be stored in a computer memory that is in comunication with the computer processor. Additionally, embodiments of the present invention may obtain digital video input directly from the video sensor or from a frame grabber, wherein the video input is obtained at a configurable rate of frames per second.  
      A specific video frame may be processed by the computer processor by a program that uses video processing algorithms to deduce event data. State information, as needed, can be deduced, maintained and stored in the computer memory in order to facilitate deductions and event determination. Thereafter, deduced event records and streaming video can be time synchronized, generated, and sent over the TCP/IP interface.  
      Within embodiments of the present invention, the outputs of a position information source, a video sensor, an orientation information source and an atomic clock receiver are fed into a computer processor (using a video frame grabber, if necessary). The computer processor executes a program, wherein the program consists of a number of specific processing elements. One of the processing elements will preferrably include video processing algorithms for carrying out specific operations such as image stabilization, motion detection, object detection, object tracking and object classification.  
      Video images captured from the video sensor are processed one frame at a time. Objects are identified by the video processing algorithms and as a result an event record is created that contains facts about each identified object. The actual time that the video frame was captured is determined, based on information from the atomic clock receiver, and set in the event record. Specific facts such as object height, width, size, orientation, color, type, class, identity and other characterists are determined and recorded in the event record. Additional pre-determined information may be gathered and added to the event record by adding vision processing algorithms that can process the incoming object data for the pre-determined information.  
      Event records may contain, but are not limited to, the following attributes: Sensor ID 
          Time and Date     Sensor Azimuth     Sensor Tilt     Sensor Zoom     Event Type     Event Name     Event ID     Coordinate System Type     Object ID     Object Type     Object Activity     Object Location (X,Y,Z coordinates)     Object Height     Object Width     Object Direction     Object Speed     Object Shape     Object Color     Object Characteristics     Object Location        

      As vision processing algorithms advance, it is expected that higher accuracy and more complete security event data will be produced using these new algorithms. It is expected that these algorithms can be easily implemented within embodiments of the present invention by replacing and/or augmenting the algorithms as defined herein. It is also expected that communication protocols and standards for the communication of security events may evolve over time. These new protocols and standards are also envisioned as being utilized within embodiments of the present invention. Further, sensing technologies, in addition to those currently listed, are likely to become available. In particular, any use of multiple cameras, different lens technology, multi-mode video sensors, multiple video sensors, laser range-finding, physical positioning sensors, replacements for position information source technology, radio direction-finding, radar, or similar devices can be used in variant implementations of the present invention.  
      It is possible to use a wide variety of vision processing algorithms for the detection, tracking, classification, and behavior analysis functions of the invention. These vision processing algorithms could range from very rudimentary or simple algorithms to very sophisticated algorithms. Embodiments of the present invention comprise aspects wherein no behavioral analysis or classification algorithms are implemented and the invention retains the ability to function as described.  
      Embodiments of the present invention further comprise inventive aspects that allow for the environmentally aware surveillance device or system to transmit and receive information from external identification systems. In particular, identification systems that provide identity information based upon characteristic information may be accessed in order to enhance the capabilities of the present invention. Examples of such identification systems include, but are not limited to, fingerprint recognition systems, facial recognition systems, license-plate recognition systems, driver&#39;s license databases, prison uniform identification databases or any other identification system that identifies a specific individual or individual object based upon the individual&#39;s characteristics.  
      Information obtained from an external identification system would be used by the vision processing algorithms such that the object ID delivered with an internal system security event would be consistent with the ID used by the external, characteristic-based identity system. It is likely that many variations of external identification systems might provide valuable information that would be useful when used in conjunction with the vision processing algorithms embedded within the present invention. Identification data relating to aspects such as facial recognition, license plate identification, gait identification, animal identification, color identification, object identification (such as plants, vehicles, people, animals, buildings, etc.) are conceivable as being utilized within embodiments of the present invention.  
      By an external identification system, the present invention could identify the specific instance of an object or event is observed along with the type of object or event that is being observed within the surveillance area. In the event that an external identity system is not available for use, the vision processing algorithms within the present invention may create their own object ID for the object types that can be identified. In the event that an external identity system is available to provide identification for specific characteristics of object types, then the invention may use the external instance object ID for the object identified.  
      The present invention would typically not have access to topographical information unless a system operator supplied the topographical information at time of the configuration system. In other embodiments of the present invention, the device would interact with an external Graphical Information System (GIS) in order to obtain topographic information for the area under surveillance. This topographic information defines the relative heights for all the points in the area under surveillance. The topographic information would be used in conjunction with additional environmental awareness data in order to provide more accurate 2D to 3D coordinate mapping without requiring additional operator input.  
       FIGS. 1 and 3  illustrate an embodiment of an environmentally aware intelligent surveillance device system  100  and an environmentally aware sensor  105 . As presented in  FIG. 1 , the system  100  comprises three environmentally aware sensors  105   a,    105   b  and  105   c.  The sensors illustrated within  FIGS. 1 and 3  are camera-type sensors, wherein the sensors  105 ,  105   a,    105   b  and  105   c  are positioned atop poles. Positioning the sensors  105   a,    105   b  and  105   c  in this manner allows for the sensors to more easily monitor designated areas. The sensors  105   a,    105   b  and  105   c  would normally be installed in a single position, wherein the sensor can have a predetermined range of motion in order to view a predetermined circumscribed area. In additional embodiments, the sensors can be installed on a moving platform. In that instance, the video processing, tracking, and location awareness algorithms are be enhanced to handle ongoing inputs from the IMU in order to correct for changes in the device orientation while determining object facts (e.g., object location, speed, etc . . . ).  
      The positional information source is in this example provided by a GPS satellite  110  that is in communication with the environmental sensors  105   a,    105   b  and  105   c.  The GPS satellite  110  provides location data in regard to the geographic location of the environmental sensors  105   a,    105   b  and  105   c  to the sensors. This location data is used in conjunction with acquired surveillance sensor data of a monitored object to provide environmentally aware surveillance data that is associated with the object under surveillance.  
      For example,  FIG. 1  illustrates a geographic area wherein the sensors  105   a,    105   b  and  105   c  are located. Also located in the area are two oil storage tanks  117   a,    117   b  and a gasoline storage tank  116 . The tanks  116 ,  117   a  and  117   b  are permanent structures that are located in the geographic area, and a road  118  transverses the geographic area.  
      Each sensor  105   a,    105   b  and  105   c  is configured to monitor a specific geographic area, in this instance sensor  105   a  monitors AUS  120   a,  sensor  105   b  monitors AUS  120   b  and sensor  105   c  monitors AUS  120   c.  As seen in  FIG. 1 , the various areas that are under surveillance may overlap in some instances as the movement of the sensors changes the areas that each sensor monitors.  
      One important aspect of the environmentally aware sensors  105   a,    105   b  and  105   c,  and therefore their respective states, is the definition of what area in the real world the areas that the sensors are observing are located. By evaluating the mapping from points in the sensor&#39;s AUS views, such as those at the edge and on the corner points of the sensor using the same process for mapping object locations, the actual observation area seen by the sensor can be determined. This state information can be saved or it can be sent in an event message with other state information.  
      In the present example, the object that is being monitored by the system is a truck  115  that is traveling along the road  118  that passes through the respective areas that each sensor  105   a,    105   b  and  105   c  are monitoring. Objects that are permanently located within the respective AUS that are monitored by the sensors are observed and identified within each AUS. The truck  115  is identified by the system as a foreign object, and as such its movements may be monitored by the surveillance system  100 .  
      As the truck  115  enters an AUS the location and the time the location is located in the AUS is determined.  
      Time Data Acquisition And Utilization  
      Time data is obtained and used by the invention to synchronize the data received or produced by each component utilized within the embodiments of the present invention. This aspect of the present invention ensures that decisions made for a particular individual video frame are made using consistent information from the various sources within the system or device due to the fact that all other information that was observed and acquired was at the same real-world time as the time the video frame was taken. The phrase “same real-world time” is presumed to be accurate within some reasonable time interval that can be determined by a system operator. More specifically, the time index of each system or device component should be accurate to near one hundredth and no larger than one tenth of the time between video frames.  
      For time information to be synchronized between devices or components that are used within the present invention, they must initially obtain a time reference. Ideally, that time reference can automatically be communicated to each device or component. When this is not possible, a dedicated time receiver must receive the time reference and communicate the time to all devices or components.  
      The United States government sends a time reference signal via radio waves called the atomic clock signal, wherein all atomic clock receivers can receive this signal. A GPS system broadcasts reference time signals in conjunction with the GPS information that it broadcasts. Another alternative is to take time information from Network Time Protocol (NTP) public timeservers. This is a very cost-effective option due in part to the requirement that the invention must communicate the event information via a network output; this network may have access to an NTP server across the network. Further, it is expected that time synchronization technologies will improve in the future and that these improvements are similar in nature to those described herein.  
      Video Processing Algorithms  
      Video processing algorithms process video to identify objects that are observed in the video in addition to identifying and classifying those objects to individual types of objects (and in some cases the identity of individual objects) and tracking the motion of the objects across the frame of the video image. The results of these algorithms are typically denoted as event information in that the observation and determination of an object within the video frame is considered an event.  
      Each event determined by the vision processing can contain various characteristics of the object determined by the vision processing (e.g., height, width, speed, type, shape, color, etc . . . ). Each frame of video can be processed in order to create multiple events. Each object identified in a video frame may be determined to be a later observation of the same object in a previously processed video frame. In this manner, a visual tracking icon or bounding box may be constructed and displayed showing the locations of the object over time a time period by showing its location in each video frame in a sequence of frames.  
      The visual tracking icon&#39;s location and position are based upon gathered track data. A track is defined as a list of an object&#39;s previous positions, as such, tracks relating to an object are identified in terms of screen coordinates. Further, each identified object is compared to existing tracks in order to gather positional data relating to the identified object. The event information resulting from the video processing algorithms is transmitted as a stream of events, wherein the events for a given frame can be communicated individually or clustered together in a group of events for a given time period.  
      Lens Equations  
      The location and size of an observed object can be determined by utilizing the specific parameters of the lens and video sensor of the environmentally aware surveillance device, the location and orientation of the environmentally aware surveillance device and the relative location of the object on the ground. A basic lens equation that may be utilized within embodiments of the present invention is shown in  FIG. 9 .  FIG. 10  shows the application of the lens equation on an environmentally aware sensor device that is mounted some height above the ground. Using the basic lens equation, the size of the object captured by the video sensor is determined by the distance of the object from the lens, the size of the object, and the focal length of the lens.  
      When an environmentally aware sensor device is mounted above the ground at some orientation of pan, tilt and roll, trigonometry is used to determine the values to be plugged into the basic lens equation based on the angles of pan, tilt and roll as well as the height of the environmentally aware device. When an object is observed within the view of an environmentally aware sensor device, there are infinite combinations of object sizes and distances that can form the same image on the video sensor; this can be shown by solving for “D” using the basic lens equation for a fixed value of “P” while varying the value of “O”.  
      In order to bring the lens equation down to one specific value of “O” for a given observed value of “P”, an assumption is made that the identified object seen in the view is located on the ground. More specifically, the base of the detected object is assumed to be located on the ground. This allows use of the basic lens equation and trigonometry to determine a single value of “O” for the observed value of “P.” Since the video sensor is a 2D array of pixels, the calculations described above are done for each of those two dimensions, therefore resulting in a two-dimensional height and width of the object in real world dimensions.  
      Lens and Photo Sensor Information  
      Two of the key pieces of information required by the lens equation are the focal length of the lens and the size of the video sensor. The lens may be a fixed focal length lens where the specific focal length can be determined at the time of lens manufacture. The lens may be a variable focal length lens, typically called a zoom lens, where the focal length varies. In the instance that a zoom lens is utilized, the actual focal length at which the lens is set at any point in time can be determined if the lens includes some sort of focal length sensing device. The size of the video sensor is typically determined by its height and width of sensing pixels. Each pixel can determine the varying level of intensity of one or more colors of light. These pixels also typically have a specific size and spacing, so the size of the video frame is denoted by its height and width in pixels that determines the minimum granularity of information (one pixel) and the length of an object in pixels by multiplying the number of pixels times the pixel spacing.  
      Position Information  
      An environmentally aware surveillance device can be mounted virtually anywhere. Using the lens equations and trigonometry as described above, the location of an object can be determined in reference to the location of the environmentally aware surveillance device. In order to locate that object in some arbitrary real-world coordinate system, the position of the environmentally aware surveillance device in that coordinate system must be known. Therefore, by knowing the position of the environmentally aware surveillance device in an arbitrary coordinate system and by determining the location of an object in reference to the environmentally aware surveillance device position, the environmentally aware surveillance device can determine the location of the object in that coordinate system.  
      Position information is typically used in navigation systems and processes. The GPS system broadcasts positional information from satellites. GPS receivers can listen for the signals from GPS satellites in order to determine the location of the GPS receiver. GPS receivers are available that communicate to external devices using a standard protocol published by the National Marine Electronics Association (NMEA). The NMEA 0183 Interface Standard defines electrical signal requirements, data transmission protocol and time, and specific sentence formats for a 4800-baud serial data bus. GPS receivers are also available as embeddable receiver units in the form of integrated circuits or as mini circuit board assemblies. Further, it is expected that position information technologies will improve in the future and that these improvements are similar in nature to those described herein.  
      Orientation Information  
      As mentioned above, the pan, tilt, and roll of the environmentally aware surveillance device are necessary to the calculation of the trigonometry that is required to use the lens equation in order to determine the relative distance between and the size of an object and the environmentally aware surveillance device. More specifically, the pan, tilt, and roll are three measures of the angles in each of three orthogonal dimensions between the specifically chosen real world coordinate system and the three dimensions defined along the length and width of the video sensor and the distance that is perpendicular to the video sensor through the lens.  
      Orientation information is determined by measuring the angles in the three dimensions (pan, tilt, and roll dimensions) between the real world coordinate system and the video sensor. These angles can be measured only if the reference angles of the real world coordinate system are known. Therefore, an orientation sensor must be installed such that its physical orientation with respect to the video sensor is known. Then, the orientation sensor can determine the angle of the video sensor in each dimension by measuring the real world angles of the orientation sensor and combining those angles with the respective installed orientation angles of the vision sensor. In embodiments of the present invention, IMUs determine changes in orientation by comparing the reference angles of gyroscopes on each of the three dimensions to the housing of the environmental awareness device. As the housing moves, the gyroscopes stay put; this allows the angle on each of the three dimensions to be measured to determine the actual orientation of the housing at any time.  
      An alternative to an orientation sensor that is part of the device is to determine the orientation of the sensor at the time of installation. This determination can be made by the use of an orientation sensor, by measurement using some external means, or by calibration using objects of known size and orientation within the view of the sensor. The orientation information source can be a person who measures or estimates the necessary orientation values. Methods for measurement can be the use of bubble levels, surveying tools, electronic measurement tools, etc. Automatic measurement or calibration of orientation can be done by taking pictures of objects of known size via the video sensor then using trigonometry and algorithms to deduce the actual orientation of the sensor with respect to the real world coordinate system. It is expected that orientation information technologies will improve in the future and that these improvements are similar in nature to those described herein.  
      Mapping and Geographical Information System Information  
      As previously mentioned, a coordinate system is used as a reference for denoting the relative positions between objects. Coordinate systems are usually referred to as “real world coordinate systems” when they are used in either a general or specific context to communicate the location of real world objects. Examples of such coordinate systems are the latitude and longitude system and the Universal Transverse Mercator system.  
      Because trigonometry uses an idealized, 3D coordinate system where each dimension is orthogonal to the others and the earth is a sphere with surface curvature, there will be some error in mapping the locations on the sphere to orthogonal coordinates. By offering a system operator the choice of the real world coordinate system to implement, the operator is not only given the control of where these errors show up, but as well the units of the coordinate system that will be used.  
      The topographical information for the area viewed by the video sensor in the environmentally aware surveillance device is important mapping information needed by the device. Once the device knows its own position, it can use the topographical information for the surveillance area to determine the ground position for each point in the surveillance view by projecting along the video sensor orientation direction from the known video sensor height and field of view onto the topographical information. This allows the device to use topographically correct distances and angles when solving the lens equation and trigonometric equations for the actual object position and orientation.  
      GISs store systematically gathered information about the real world in terms of some (or many) real world coordinate systems. GISs are typically populated with information that has been processed from or determined by aerial photography, satellite photography, manual modeling, RADAR, LIDAR, and other geophysical observations. The processing of these inputs results in information that is geo-referenced to one or more real world coordinate system. Once a real world coordinate system is selected, a GIS can be accessed to gather topographic information showing the actual surface of the earth or information about the locations of specific environmental characteristics.  
      Several publicly available GIS databases are available either for free or for nominal fees to cover distribution media. The United States Geographical Survey (USGS) publishes GIS databases that include topographical information that include topographical information of the form needed by the environmentally aware, intelligent surveillance device. GIS databases including the USGS topographical information are frequently packaged by GIS vendors along with GIS tools and utilities. These packages provide more up-to-date GIS information in an easy to access and use manner via their respective tools packages. It is expected that topographical information technologies will improve in the future and that these improvements are similar in nature to those described herein.  
      State Message Output and State Information  
      Given that the environmentally aware sensor determines its position using the inputs and processes described already, it can maintain this state information (position, orientation, height, altitude, speed, focal length, for example). In particular, all information determined, observed, or deduced by the sensor from its sensing capabilities and all deductions, parameters, and conclusions that it makes can be considered state information.  
      The state information generated by the sensor can be used for decision-making functions and for implementing processes. The state information can also be used to test for the movement of the sensor. This aspect of the present invention is accomplished by comparing the state information for a current time period against the state information from a previous time period or periods, wherein thereafter the sensor can deduce its speed, direction, and acceleration. Further, the sensor has the capability to use state information to make predictive decisions or deductions in regard to future locations. The sensor can also send event messages either containing or referencing specific state information as additional output messages.  
      Mapping Objects From 2D to 3D  
      As shown in  FIGS. 1 and 2 , each object that is identified in a camera frame&#39;s event data is then mapped from its 2D location in the frame to its 3D location in a 3D model using the adjusted parameterized lens equation. The adjusted parameterized lens equation is created by using the position information, orientation information, lens information, photo sensor information, and topographical information determined to be accurate at the time the camera image was taken to fill in the appropriate values in the trigonometric equations representing the geometric relationship between the camera sensor, the object, and the three-dimensional coordinate system in the lens equation. By these calculations, the adjusted parameterized lens equation describes the relationship between the location of the object and the environmentally aware sensor. Since the sensor is located in the 3D model, the object is then located in the 3D model. The 3D location data for each object is then stored within the event data for the frame.  
      Since an object that appears on the 2D sensor frame can actually be a small object close to the lens or a large object far from the lens, it is necessary for the mapping system to make some deductions or assumptions about the actual location of the object.  
      For most surveillance systems, the objects being detected are located on or near the ground. This characteristic allows for the mapping system to presume that the objects are touching the ground, thereby defining one part of the uncertainty. The other part of the uncertainty is defined by either assuming that the earth is flat or very slightly curved at the radius of the earth&#39;s surface or by using topographical information from the GIS system. Taken together, the topographical information plus the presumption that the identified object touches the ground furnishes the last variables that are needed in order to use the adjusted parameterized lens equation to calculate the location of the object in the 3D model from its location in the 2D video frame. As an alternative to topographical information, specific points of correspondence between the 2D and 3D model can be provided from the GIS system and various forms of interpolation can be used to fill in the gaps between the correspondence points.  
      Environmental awareness calculations can be performed using 2D to 3D transformations that are stored in a lookup table. A lookup table generator tool creates a mapping of points within the 2D screen image (in screen coordinates) to locations within a 3D real world model in real world coordinates. The lookup table is a table that identifies the 3D world coordinate locations for each specific pixel in the screen image. The lookup table is generated at the time of configuration and then is used by the coordinate mapping function for each object being mapped from a 2D to 3D coordinate.  
      There are two cases that are handled by the environmental awareness module. The first case is where the user runs a manual lookup table generator tool in order to create a lookup table. The second case is where the lookup table is automatically generated using the sensor&#39;s inputs from the position information source and orientation information source along with the pre-configured lens data. Within embodiments of the present invention, both of these cases are combined such that the lookup table is automatically generated from the sensor inputs and this is only overridden when the user desires specifically entered 2D to 3D mappings.  
      Embodiments of the present invention utilize representative manual lookup table generation tools. The lookup table generator uses control points to identify specific points in the 2D screen that map to specific points in the 3D world. These control points are entered by the user via a graphical user interface tool, wherein the user specifies the point on the 2D screen and then enters the real world coordinates to which that point should be mapped.  
      During the ongoing processing, the environmental awareness module maps object locations from the 2D camera frame coordinate locations identified by the tracking module into 3D world coordinates, wherein this function is accomplished using the lookup table. As mentioned above, within embodiments of the present invention the object tracking algorithm performs the steps of adding the new object to the end of a track once the track is located. Thereafter information about the object is collected and mapped from pixel to world coordinates and the speed and dimensions of the object are computed in the world coordinates and then averaged.  
      After the environmental awareness module completes processing, the information generated for each object detected and analyzed within the video frame is gathered. The event information is placed in the form of an XML document and is communicated to external devices using the user-configured protocol. The video frame is marked with the exact date and time and sensor ID that is used within the event records generated from that frame and the video frame is communicated using the user-configured video protocol (either analog or digital).  
      As shown in  FIG. 1 , t 1  represents the time period that the truck  115  was located in AUS  120   a  and t 2  represents the time period that the truck  115  was simultaneously located in AUS  102   b  and  102   c.  As the truck  115  travels through the AUS  120   a,    120   b  and  120   c,  data is collected in reference to the identified foreign object that is the truck  115 .  
      The image of a particular AUS that is captured by an environmental sensor  105   a,    105   b  and  105   c  can be displayed to a system operator, as illustrated by the camera display view  130  ( FIGS. 1 and 2 ). Further, the 2D image as captured by the sensors  105   a,    105   b  and  105   c  is used to subsequently construct a 3D model display  135  of the sensor image. As shown in  FIG. 2 , a bounding box  210  in the sensor view  130  highlights the detected truck  115 . The corresponding points of the AUS as viewed within the sensor view  130  and the 3D model view  135  are noted by the points  220 ,  225 ,  230  and  235  of  FIG. 2 . The points  220 ,  225 ,  230  and  235  aid in highlighting the previous and current position of the detected object (the truck  115  in this instance) as viewed within the 3D model  135  of the sensor view  130 . Models of the sensors  105   a  and  105   b  as well as the tanks  116 ,  117   a  and  117   b  are displayed on the 3D model as  205   a,    205   b,    216 ,  217   a  and  217   b,  respectively.  
       FIG. 4  illustrates a process flow showing the flow of a 2D image  330  captured by the sensor (which in this instance is a camera)  405  of an individual as they move through an AUS  310   a  and  310   b  to the 3D view  335  that is constructed of the surveillance area. This process is further illustrated in  FIG. 4 , wherein the image data that is acquired by the sensor  405  is employed at process  410  in conjunction with other pre-specified information (e.g., lens focal length, pixel size, camera sensor size, etc . . . ) in order to generate information in regard to an observed object.  
      The generated information is used at process  415  in conjunction with acquired sensor  405  location information and 2D-to-3D mapping information in order to generate 3D object event information in regard to the observed object. A process for mapping 2D-to-3D information is specified in detail below. At process  420 , this 3D object event information is used in conjunction with a 3D GIS model in order to generate a 3D display image of the observed objects location, wherein at process  425  and as discussed in detail below, a 3D model  135  that displays a specific AUS can be constructed within the system and displayed to a system operator.  
      As illustrated in  FIGS. 5 and 6 , the outputs of the position information source  540 , video sensor  505 , IMU  545  and the atomic clock sensor  515  are fed into a computer processor (not shown), wherein the computer processor is in communication with the computer memory (not shown). A program residing in the computer memory is executed by the computer processor, the program consists of a number of specific processing elements or modules. As mentioned above, one of the processing modules preferrably includes an automated video analysis module  510  for carrying out sub-module operations via video processing algorithms  511 , as image stabilization, motion detection, object detection, and object classification. Additional sub-modules that can reside in the memory are the object tracking module  512  and a behavioral awareness module  513 .  
      As illustrated in  FIG. 5 , a video frame is acquired and transmitted from the video sensor  505  to the memory wherein the acquired frame is analyzed via the automated video analysis module  510 . Time information pertaining to the time the respective video frame was acquired is transmitted from the atomic clock sensor  515  to the automated video anlysis module residing in the memory, wherein the actual time that the video frame was captured is determined and set in the event record. The time information is used in conjunction with the video processing alogrithms sub-module  511  to aid in performing the image stabilization, motion detecton, object detection and object classification algorithmic functions of the video processing sub-module. Additonally, facts such as object height, width, size, orientation, color, type, class, identity, and other similar characterists are determined and placed in the event record.  
      As shown below, the object classification algorithms may be executed within various sub-modules of the system, because as each processing algorighm runs, additional features and data about detected objects become available that allow for more accurate object classification. Video frames may be updated by the video processing algorithms to include visual display of facts determined by the processing algorithms. Upon the completion of the frame processing, the video frame information is update and an updated event record of the frame information is generated. This information is passed to the object tracking sub-module  512 , wherein objects that have been identified within the video frame are processed via the object trackng algorithms and further object classification algrtihms. One of ordinary skill in the art would recognize that other object classification algorithms can be implemented as substitutes in place of the one described herein.  
      The object tracking sub-module  512  contains an object tracking algorithm that provides input data for the environmental awareness of the sensor. The algorithm integrates with other vision processing algorithms to first identify the screen coordinate location of the object (the location on the video sensor or what would be shown on a screen displaying the video). Each identified object in each frame is compared to objects found in previous frames and is associated to the previously identified object that most accurately matches its characteristics to create an object track. An object track is the location of an identified object from frame to frame as long as the object is within the area under surveillance.  
      The present invention maintains a state history of the previously detected positions of objects in the form of tracks. As mentioned above, a track is defined as a list of an object&#39;s previous positions, as such, tracks relating to an object are identified in terms of screen coordinates. Each identified object is compared to existing tracks. In the event that an object is determined to match that track, it is added as the next position in the track. New tracks for identified objects are created and inactive tracks for objects are deleted as required. One of ordinary skill in the art would recognize that any capable tracking algorithm can be used in place of the one described herein.  
      Video frames may be updated by tracking algorithms to include visual display of facts determined by the algorithms. As previously mentioned, because as each processing algorighm is executed more additional features and data about detected objects may become available that allow for more accurate object classification an object classification algortim further analyzes the information.  
      Again, upon the completion of the frame processing anlaysis by the object tracking sub-module  512  the video frame information is updated and an updated event record of the frame information is generated. The resulting video frame and event record information is passed to the behavioral awareness module  513 , wherein the video frame is further analyzed via behavioral identification algorithms and further object classification algorithms.  
      The behavioral awareness sub-module  513  may analyze the object tracking information to identify behaviors engaged in by the objects. The behavior analysis algorithms may look for activity such as objects stopping, starting, falling down, behaving erratically, enterring the area under surveillance, exiting the area under surveillance, and any other identifiable behavior or activity. Any facts that are determined to be relevant about the object&#39;s behavior may be added to the event record. One of ordinary skill in the art would be able to choose from many available behavior identity algorithms.  
      Once the object and its behavior has been identified and tracked to screen coordinates, the object will be further processed by the environmental awareness module  535 . As illustrated in  FIG. 6  the environmental awareness module  535  uses information from the IMU  545  to determine the orientation (pitch, roll, and direction) of the video sensor at step  625 . Also at step  625  the environmental awareness module  535  also uses information about the focal length of the lens (either pre-programmed into the computer memory at the time of manufacturing or available from the lens transmiting the information directly to the computer processor).  
      In further aspects of the present inveniton at step  625  the environmental awareness module  535  uses information from the position information source  540  to determine the position of the sensor (including height above the ground). At step  630  this information is combined with object position identified by the tracking module, lens equations, equations that can convert between the coordinate system utilized by the position information source and the selected world coordinate system, geometric mapping algorithms, and known characteristics of the video sensor in order to determine the location of the object in real world coordinate systems. Facts such as object location, object direction, object speed, and object accelleration may be determined by the tracking and environmental awareness modules. The video frames may be updated by the environmental awareness algorithms to include visual display of facts determined by the algorithms.  
      The latitude/longitude coordinates submitted by the position information source  540  are converted to the coordinate system of a 3D model and thereafter at step  635  using the coordinate mapping equations, functions, or information submitted by the GIS system  530  an observed object is mapped to a 3D location. The parameterized lens equation is also similarly converted to the coordinate system of the 3D model using the same coordinate mapping process to create the adjusted parameterized lens equation. The current mapping information is defined by the adjusted parameterized lens equation plus the coordinate mapping process.  
      The information generated by the tracking and location awareness modules are added to the event record created by earlier processing modules. A globally unique identifier may be programmed into the computer memory at the time of manufacturing. This identifier may be added to the event record as the sensor ID. The coordinate system type in which the location coordinates have been defined may additionally be added to the event record.  
      For each frame processed by the computer program, many event records may be created; one is created for each object identified within the frame. When processing has been completed, the event records and the video frame are sent to the device output interfaces. With each video frame that is sent, the exact date and time that was set within the event records created by processing that frame may be attached to the video frame (using appropriate means) to allow synchronization between the event records and video frames. Each video frame may be sent to the analog video output via the output device interface  550 . In addition, each frame may be compressed using the configured video compression algorithm and sent to the digital output. Also, each event record created when procesing the frame may be formatted according to the configured protocol and sent to the digital output via the output device interface  550 .  
      Position and orientation information may need to be calibrated, depending on the actual components used in the construction of the device. If this is necessary, it is done according to the specifications of the component manufacturers using external position information sources, map coordinates, compasses, and whatever other external devices and manual procedures are necessary to provide the needed calibration information. The computer program may contain noise and error evaluation logic to determine when and if any accumulated errors are occurring; when found, compensation logic may reset, reconfigure, or adjust automatically to ensure accurate output.  
       FIG. 7  illustrates an environmentally aware sensor system for surveillance  700  that comprises a video sensor  715 . The video sensor  715  provides video signals that correspond to a field-of-view of an AUS. The system also has a computer processor  720  and a position information input  745  for receiving position signals indicative of the location of the system with respect to a real world coordinate system. An orientation information input  750  receives orientation signals that are indicative of the orientation of the video sensor relative to a real world coordinate system. Program modules are employed by the system and are executed by the processor  720 .  
      The program modules include a video processing module  705   a  for detecting motion of a region within a field-of-view of the sensor  715 ; a tracking module  705   b  for determining a path of motion of an object within the region of the field-of-view of the sensor  515 . A behavioral awareness module  705   c  is implemented to identify predetermined behaviors of objects that are identified in the region within the field-of-view of the sensor  515 . Additionally, an environmental awareness module  705   d  is employed by the system, wherein the environmental awareness module  705   d  is responsive to predetermined information that relates to characteristics of the video sensor  515 , the position signals and the orientation signals.  
      The environmental awareness module  705   d  also is responsive to outputs from the video processing module  705   a,  the tracking module  705   b  for computing geometric equations and mapping algorithms in addition to providing video frame output and event record output indicative of predetermined detected conditions to an external utilization system. The system further comprises a time signal input for receiving time signals. The fore mentioned program modules are responsive to the time signals for associating a time with the event record output. The program modules also include an object detection module  705   e,  and an objection classification module  705   f  that are responsive to the video signals for detecting an object having predetermined characteristics and for providing an object identifier corresponding to a detected object for utilization by other program modules within the sensor system  715 . Further, an image stabilization module  705   g  is implemented for stabilizing the raw output of the video sensor prior to provision as event information.  
       FIG. 8  illustrates an embodiment of the present invention that comprises an environmentally aware sensor  800  for a surveillance system. The sensor comprises a video sensor  815 , the video sensor  815  providing video signals that are detected in the field-of-view of an AUS. A position information source  845  receiver obtains position information in regard to the sensor, and further, an IMU  850  detects the relative position of the video sensor  715 . A camera lens  810  is situated on the video sensor, wherein the camera lens  810  has predetermined optical characteristics.  
      A clock receiver  820  provides time signals in regard to events detected by the video sensor  815 . The sensor also comprises a computer processor  835  that is responsive to signals from the video sensor  815 , position signals from the position information source receiver  845 , position signals from the IMU  850 , time signals from the clock receiver  820  and predetermined other characteristics of the sensor. The computer processor  835  also executes predetermined program modules, the program modules being stored within a memory in addition to having the capability to utilize in conjunction with their specific programming requirements the video sensor signals, position information source position signals, IMU position signals and said time signals in addition to other signal inputs.  
      The processor  835  operative to execute the stored program modules for the functions of detecting motion within a field-of-view of the video sensor, detecting an object based on the acquired video signals, tracking the motion of a detected object, classifying the object according to a predetermined classification scheme. Additionally, the program modules provide event record data comprising object identification data, object tracking data, object position information, time information and video signals associated with a detected objected. Also, a data communications network interface  860  is employed to provide the event record data to an external utilization system.  
       FIG. 11  illustrates a method for determining the characteristics of an object detected by a surveillance sensor in an area under surveillance that relates to embodiments of the present invention. Initially, at step  1105  the position, orientation and time index of signals is determined and provided by a surveillance sensor. The position, orientation and time index signals are based upon position, orientation, and time input signals that are gathered relative to a predetermined real world spatial and temporal coordinate system. At step  1110  the surveillance sensor detects an object within an AUS. Lastly, at step  1115  event information is provided to an external utilization system, the event information comprises signals from the surveillance sensor, information corresponding to attributes of the detected object in addition to position information associated with the detected object relative to the predetermined real world spatial and temporal coordinate system.  
       FIG. 12  illustrates yet another method for providing object information from a sensor in a security monitoring environment for utilization by a security monitoring system that relates to embodiments of the present invention. At step  1205  the method places an environmentally aware sensor in an area under surveillance, the sensor having a range of detection and predetermined sensor characteristics and inputs for receipt of position information from a position information source and orientation information from an orientation information source. At step  1210 , the environmentally aware sensor self determines the location of the environmentally aware sensor relative to a 3D real world coordinate system based on the position information and the orientation information.  
      Next, at step  1215 , the 3D coordinates of the area within the range of detection of the environmentally aware sensor are determined based on the predetermined sensor characteristics and the determined location and orientation of the sensor. An object within the range of detection of the environmentally aware sensor is detected at step  1220  and at step  1225  the 3D location of the detected object within the range of detection of the environmentally aware sensor is determined. Lastly, at step  1230  the location of the detected object is provided in addition to identifying information relating to the detected object and a data feed from the EA sensor to the external security monitoring system.  
      The functions of capturing and communicating sensor state information enable embodiments of environmentally aware sensors to be configured in varying forms. As described herein, the sensing capabilities of the present invention are collocated, joined, and built into a single unit. However, this may not be cost effective for certain embodiments. Alternative embodiments that separate or distribute the various sensing components across multiple computers in a distributed system are possible and may be the most effective for a given implementation scenario.  
      Alternative embodiments of the present invention can be defined such that any environmentally aware sensor component or set of components that provide(s) input to the environmental awareness module can be implemented separately from that module. This allows for existing commercially available components to implement the environmentally aware sensor in a logical form but not a physical form.  
      Therefore, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.