WO2014136979A1 - 移動体を監視する装置及び方法 - Google Patents
移動体を監視する装置及び方法 Download PDFInfo
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- WO2014136979A1 WO2014136979A1 PCT/JP2014/056184 JP2014056184W WO2014136979A1 WO 2014136979 A1 WO2014136979 A1 WO 2014136979A1 JP 2014056184 W JP2014056184 W JP 2014056184W WO 2014136979 A1 WO2014136979 A1 WO 2014136979A1
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- WIPO (PCT)
- Prior art keywords
- tracking
- monitoring
- monitoring area
- target
- moving object
- Prior art date
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Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
- G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
- G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
- G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
- G08B13/19602—Image analysis to detect motion of the intruder, e.g. by frame subtraction
- G08B13/19608—Tracking movement of a target, e.g. by detecting an object predefined as a target, using target direction and or velocity to predict its new position
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/42—Simultaneous measurement of distance and other co-ordinates
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/78—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using electromagnetic waves other than radio waves
- G01S3/782—Systems for determining direction or deviation from predetermined direction
- G01S3/785—Systems for determining direction or deviation from predetermined direction using adjustment of orientation of directivity characteristics of a detector or detector system to give a desired condition of signal derived from that detector or detector system
- G01S3/786—Systems for determining direction or deviation from predetermined direction using adjustment of orientation of directivity characteristics of a detector or detector system to give a desired condition of signal derived from that detector or detector system the desired condition being maintained automatically
- G01S3/7864—T.V. type tracking systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/20—Analysis of motion
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10016—Video; Image sequence
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10028—Range image; Depth image; 3D point clouds
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30196—Human being; Person
Definitions
- the present invention relates to an apparatus and method for monitoring a moving object while automatically tracking the moving object in a monitoring area.
- Patent Document 1 discloses a security system in which the camera unit is made to follow the movement of an intruder, and the image data of the intruder is displayed.
- Patent No. 3011121 gazette
- the present invention has been made in view of the above circumstances, and it is possible to switch the tracking target even when there are a plurality of moving bodies in the monitoring area, and set the moving body desired by the observer as the tracking target
- Another object of the present invention is to provide an apparatus and method for monitoring a body.
- an apparatus and method for monitoring a mobile are provided.
- an object is detected by scanning the inside of the monitoring area with the optical range finder, the moving object is specified among the detected objects, and the most recently specified moving object in the monitoring area is the tracking target
- the camera device automatically tracks the moving object set as the tracking target. That is, when a moving object intrudes into the monitoring area, the moving object is set as a tracking target.
- the monitoring area is set to a certain size as described above, the possibility that a plurality of mobile objects exist simultaneously is also high. Then, in a situation where one moving object is automatically tracked following the movement of the moving object, and the moving object is enlarged and imaged, the other moving objects are not to be monitored and the moving objects in the monitoring area are completely leaked. Monitoring can be difficult.
- all mobiles are set by setting the mobile specified most recently in the monitoring area as the tracking target. It can be set as the tracking target.
- a tracking target a moving object that has entered the monitoring area R1
- the tracking target is set each time a moving object is newly identified, that is, since the tracking object is sequentially switched as the moving object moves, it is possible to monitor the moving object in the monitoring area without omission. it can.
- a second aspect of the present invention provides a method of monitoring a mobile.
- the inside of the monitoring area is scanned by the optical range finder to detect an object, the moving object is specified among the detected objects, and the specified moving object is set as the tracking target, and the camera device performs automatic tracking
- the camera device performs automatic tracking
- the camera device performs automatic tracking
- the priority monitoring target in the monitoring area is included.
- the focus monitoring area set in advance is enlarged and fixed point monitoring is performed by the camera device.
- the monitoring area is set to a certain size as described above, the possibility that a plurality of mobile objects exist simultaneously is also high. Then, when one moving object is automatically tracked following the movement of the moving object to magnify the moving object for imaging, the other moving objects are not to be monitored, and the moving object in the monitoring area is It is difficult to monitor without omission.
- FIG. 1 is a view schematically showing the configuration of a monitoring device according to a first embodiment
- Fig. 2 is a diagram schematically showing a monitoring area to be monitored by the monitoring device
- FIG. 3 is a diagram showing the flow of monitoring processing executed by the monitoring device
- FIG. 4 is a diagram showing the flow of determination processing executed by the monitoring device
- FIG. 5 schematically shows the positional relationship of the moving object at time t1
- FIG. 6 is a view schematically showing the positional relationship of the moving object at time t2
- FIG. 7 is a view schematically showing the positional relationship of the moving object at time t3.
- FIG. 8 is a diagram schematically showing the positional relationship of mobiles in the monitoring area
- FIG. 8 is a diagram schematically showing the positional relationship of mobiles in the monitoring area
- FIG. 9 is a view schematically showing a key monitoring area set in the monitoring area;
- FIG. 10 is a diagram showing the flow of monitoring processing executed by the monitoring device according to the second embodiment;
- FIG. 11 is a view schematically showing the positional relationship of mobiles in the monitoring area;
- FIG. 12 schematically shows the positional relationship of the moving object at time t1.
- FIG. 13 schematically shows the positional relationship of the moving object at time t2;
- FIG. 14 is a view schematically showing the positional relationship of the moving object at time t3.
- FIG. 15 is a view schematically showing the positional relationship of the mobile unit after time t3 and the important point monitoring area set in the monitoring area.
- FIG. 16 is a view schematically showing the configuration of a monitoring device according to a third embodiment;
- FIG. 17 is a diagram showing the flow of monitoring processing executed by the monitoring device;
- FIG. 18 is a diagram showing the flow of monitoring processing executed by the monitoring device according to the fourth embodiment.
- the monitoring device 1 to which the control method of the present embodiment is applied includes an area sensor device 2, a camera device 3, and a monitor device 4.
- the area sensor device 2 includes a control unit 10, a storage unit 11, an input / output unit 12, a laser scanning unit 13, an object detection unit 14, a moving object identification unit 15, a moving object counting unit 16, and tracking.
- the target setting unit 17 and the like are provided.
- the control unit 10 is configured by a microcomputer having a CPU, a ROM, a RAM, and the like (not shown), and controls the laser scanning unit 13 and the like by executing a computer program stored in the storage unit 11 and the like.
- the object detection unit 14, the moving object identification unit 15, the moving object counting unit 16, and the tracking target setting unit 17 are realized as software by a computer program executed by the control unit 10.
- the area sensor device 2 corresponds to the optical distance meter described in the claims.
- the storage unit 11 is configured by a memory element (not shown) and the like, and stores various information such as a computer program and measurement results such as a detection distance and a detection angle of a detected object.
- the input / output unit 12 functions as an input / output unit that performs input of a command signal from an upper control device (not shown), notification output of a detection result of an object, and the like.
- the laser scanning unit 13 is predetermined to reflect the laser irradiation unit 13a, a mirror 13b that reflects the laser light emitted from the laser irradiation unit 13a toward the monitoring area and receives light reflected by an object in the monitoring area.
- a motor 13c rotationally drives the mirror 13b with an angular resolution and a scanning cycle, and a laser light receiving unit 13d receiving the reflected light.
- this structure is an example and the structure (The structure which does not utilize the reflective mirror 13b at the time of irradiation) which drives the laser irradiation part 13a may be sufficient.
- the object detection unit 14 detects an object in a well-known manner based on the distance (the detection distance described above) and the scanning angle (the detection angle described above) when the laser light receiving unit 13 d receives the reflected light. Then, the moving object identification unit 15 determines whether the object is a moving object or not based on the time change of how the detection distance and the detection angle corresponding to the detected object change in a plurality of scans. It is identified.
- the mobile counting unit 16 identifies the number of mobiles identified by the mobile identifying unit 15.
- the tracking target setting unit 17 sets one of the moving objects as a tracking object when there are a plurality of specified moving objects.
- the tracking target setting unit 17 is a mobile object closest to the priority monitoring target (in the present embodiment, the entrance G shown in FIG. 2) set in the monitoring area R1 among the plurality of mobile objects. Set as the tracking target.
- the position information of the moving object set as the tracking target is transmitted to the camera device 3.
- the position information includes the distance to the moving object obtained from the detection distance and the angle obtained from the detection angle.
- the camera device 3 includes an imaging camera 20 and a movable stand 21. As shown in FIG. 2, the imaging camera 20 can change the angle of view (field of view) from an angle of view ⁇ at which the moving object can be discernably captured to an angle of view ⁇ for imaging the entire monitoring area R1. It has a so-called zoom function.
- identifying the moving object means, for example, an extent that a person can recognize a face if the moving object is a person, and an extent to which the vehicle type, license plate or driver face can be recognized if the moving object is a vehicle. It means that.
- imaging when imaging is performed at the angle of view ⁇ , it is possible to recognize, for example, the face of a person by looking at the imaged image (including a still image and a moving image).
- imaged image including a still image and a moving image.
- imaging at an angle of view ⁇ although it becomes somewhat difficult to identify individual moving objects (for example, recognizing a human face), it can be grasped that at least the moving objects are present, Furthermore, it becomes possible to roughly recognize the appearance of the moving object.
- the imaging camera 20 is attached to the movable gantry 21 and is directed in the direction in which the moving object whose direction is set as the tracking target is present based on the position information of the moving object acquired from the area sensor device 2 , Control of the zoom function is performed. Then, each time the position of the moving body changes, control of the orientation of the imaging camera 20 and the zoom function is performed. In this manner, capturing a moving object by following the movement of the moving object corresponds to automatic tracking.
- the monitor device 4 includes a display unit 30, and displays an image captured by the camera device 3.
- the monitor device 4 is provided, for example, in a security room or the like (not shown), and is monitored by a security guard or the like.
- the monitoring device 1 executes the monitoring process shown in FIG. 3, and when the process is started, first initializes a tracking period, a determination period, and variables M and N (A1). Although the details will be described later, the meaning of each item is as follows.
- Tracking period A period from setting to the tracking target to setting the next tracking target. That is, it is a period until the tracking target is switched, which corresponds to a “period in which the same moving object is automatically tracked”.
- the tracking period also includes a period in which the orientation of the imaging camera 20 is changed, and a period in which the zoom function is controlled.
- Judgment period A preset period.
- Variable M A variable for counting the number of times the tracking target has been switched within the determination period. As described later, when the value of the variable M exceeds the predetermined upper limit number of determinations, it is determined that the field of view of the imaging camera 20 is frequently switched.
- Variable N A variable for counting the number of times the tracking period falls below the lower limit value. As described later, when the value of the variable N is equal to or more than the lower limit determination number (three times in the present embodiment), it is determined that the field of view of the imaging camera 20 is frequently switched in a state where the moving object can not be identified.
- the lower limit is a period during which the orientation of the imaging camera 20 is changed, a period during which the zoom function is controlled, and a period during which it is expected to be necessary to identify the moving object from the image (for example It is set in consideration of the time required to recognize.
- the monitoring device 1 scans the monitoring area R1 with the area sensor device 2 (A2), detects an object in the monitoring area R1, and specifies a moving body (A3). Then, the mobile unit closest to the emphasis monitoring target (the entrance G) is set as the tracking target (A4). At this time, as shown in FIG. 5, when a plurality of mobile objects M10 and M11 are specified in the monitoring area R1 (including the area) at time t1, the monitoring device 1 automatically performs the mobile object M10 closest to the entrance G.
- FIG. 5 schematically shows the moving body by the symbol “o”, and indicates the time when the moving body is specified by the character (“t1” in the case of FIG. 5) in the symbol. . The same applies to FIGS. 6 and 7 to be described later.
- the monitoring apparatus 1 sets the mobile object closest to the priority monitoring target as the tracking target with priority, thereby setting the desired mobile object considered to be monitored by a guard such as a guard as the tracking target. It is like that.
- the moving object is set as the tracking object as the moving object closest to the entrance G.
- This determination process is a process of determining whether or not the tracking cancellation condition for canceling the automatic tracking is satisfied based on the frequency at which the tracking target is switched, as described below. This is because when the tracking target is frequently switched, the field of view of the camera device 3 is also frequently switched, which makes it difficult to identify the moving object. Therefore, the monitoring device 1 determines whether or not to cancel the automatic tracking in this determination process.
- the monitoring device 1 determines the frequency at which the tracking target has been switched based on the following determination criteria.
- Judgment criterion A The number of times the tracking target is switched within a predetermined judgment period exceeds the judgment upper limit number.
- Judgment criterion B The number of times the tracking period in which the same moving object is automatically tracked falls below the lower limit value set in advance is continuously equal to or more than the lower judgment number. In the present embodiment, whether or not the tracking period falls below the lower limit value three times in a row.
- the monitoring apparatus 1 determines whether the tracking target has been switched (B1), and if the tracking target is not switched (B1: NO), whether the variable M has exceeded the determination upper limit number Determine (B2).
- This variable M is incremented (B1: YES, B4) each time the tracking target is switched within a predetermined period, and is initialized when the determination period elapses (steps A9: YES, A10 in FIG. 3). Therefore, by referring to the value of the variable M, it is possible to grasp how many times the tracking target has been switched within the determination period, that is, how many times the field of view of the imaging camera 20 has been switched.
- the monitoring device 1 determines whether to cancel the automatic tracking based on the determination reference A.
- ⁇ About judgment criterion B> When the tracking target is switched (B1: YES), the monitoring device 1 increments the above-described variable M (B4), and then determines whether the tracking period falls below the lower limit (B5).
- This tracking period is initialized (step A8 in FIG. 3) each time the automatic tracking is started, and is a period that has elapsed since the current point in time after the mobile object set as the tracking target was automatically tracked. It shows a period during which the same moving object is automatically tracked.
- the monitoring device 1 sets the variable N to 0, assuming that the previous automatic tracking has been performed for a period necessary to identify the moving object. (B6). On the other hand, when the tracking period falls below the lower limit (B5: YES), the monitoring device 1 increments the variable N, assuming that the previous automatic tracking has not been performed for the period necessary to identify the moving object. (B7).
- the monitoring apparatus 1 determines whether or not to cancel the automatic tracking in the determination process, and returns to the monitoring process based on the determination result.
- the monitoring apparatus 1 determines whether the tracking cancellation condition is satisfied (A6), and if the tracking cancellation condition is not satisfied (A6: NO), the tracking target set in step A4 is selected. Automatic tracking is performed (A7), and the tracking period is initialized (A8). Thereafter, if the determination period has elapsed (A9: YES), the determination period and the variable M are initialized (A10), and the process proceeds to step A2. On the other hand, if the determination period has not elapsed (A9: NO), the process directly proceeds to step A2.
- the monitoring device 1 identifies a plurality of mobile objects M10, M11, M12 in the monitoring area R1 (including the area). Therefore, the mobile unit closest to the entrance G (also the mobile unit M10 this time) is set as the tracking target, and the automatic tracking is started. In this case, since the mobile object M10 is automatically tracked continuously from the state at time t1, it is determined that the tracking target is not switched in the determination processing described above.
- the monitoring device 1 moves closest to the entrance G.
- a body in this case, the moving object M11
- the tracking target is switched, it is determined whether the tracking period falls below the lower limit value.
- This situation corresponds to, for example, a situation in which a moving body (for example, a person) enters and leaves at the entrance G in a short time, for example, when working or leaving work.
- a moving body for example, a person
- the mobile device Ma1 since the monitoring device 1 sets the mobile object closest to the entrance G as the tracking target, the mobile device Ma1 is initially automatically tracked, and the mobile object Ma2 is newly moved. When it comes closest to the entrance / exit G, the mobile unit Ma2 is automatically tracked as shown in FIG. In addition, when time passes and, for example, the moving body Ma4 newly intrudes into the monitoring area R1 and becomes closest to the entrance / exit G, the moving body Ma4 is set as a tracking target.
- the tracking target is frequently switched within the determination period, or the tracking period is often less than the lower limit continuously. That is, in the situation as shown in FIG. 8, there is a high possibility that the judgment criterion A or the judgment criterion B is satisfied, and the judgment criterion A or the judgment criterion B is satisfied (step B2: YES Or B8: YES), it is determined that the tracking cancellation condition is satisfied.
- the monitoring device 1 sets the priority monitoring area R2 preset in the monitoring area R1 as shown in FIG. To monitor the fixed point (A11).
- the priority monitoring area R2 is set in the vicinity of the entrance / exit G as a range including the entrance / exit G to be subjected to the priority monitoring.
- the size is set so as to simultaneously image a plurality of moving bodies, and when the moving body is a person, the size is set to be able to image the whole body of 3 to 4 people.
- the angle of view of the imaging camera 20 at this time is larger than the angle of view ⁇ and smaller than the angle of view ⁇ .
- the moving object closest to the key monitoring target (in the present embodiment, the entrance G) is set as the tracking target and the camera device 3 performs automatic tracking. It is possible to set the mobile object closest to the place to be operated, that is, the mobile object desired by the observer to be monitored as the tracking target.
- the tracking target can be switched automatically and appropriately even when the mobile object moves and the positional relationship changes.
- the tracking targets are sequentially switched as the moving objects move, so it is possible to monitor the moving objects in the monitoring area without omission.
- the focus monitoring area R2 is enlarged and fixed point monitoring is performed by the camera device 3. As a result, the field of view of the camera device 3 is fixed, and the mobile object can be identified.
- the focus monitoring area R2 is enlarged and the camera device is expanded. Since fixed point monitoring is performed in 3, the field of view of the camera device 3 is fixed, and a mobile can be identified. At this time, since the focus monitoring area R2 is set as a range including the focus monitoring target, that is, since the fixed point monitoring is performed with the focus monitoring target in view, the possibility that the monitoring performance is reduced is suppressed. Can.
- the priority monitoring area R2 is set to a size that allows imaging of a plurality of mobile objects, that is, since it is set to a size that emphasizes identifying mobile objects in the priority monitoring area R2, a fixed point Even during monitoring, it is possible to identify a plurality of mobile objects existing in the vicinity of the focus monitoring area R2. Therefore, it is possible to suppress the possibility that the identification performance is reduced.
- the size of the focus monitoring area is set according to the present embodiment. Can also be enlarged. That is, the size of the priority monitoring area R2 can be appropriately set based on the point that the observer places importance on.
- FIGS. 10 to 15 a control method according to the second embodiment of the present invention will be described with reference to FIGS. 10 to 15.
- the second embodiment is different from the first embodiment in which mobile object is set as a tracking target when a plurality of mobile objects are specified.
- the configuration of the monitoring apparatus is the same as that of the first embodiment, so the same reference numerals will be assigned and described. Further, in the monitoring process shown in FIG. 10, detailed description of the process common to the monitoring process of the first embodiment shown in FIG. 3 will be omitted.
- the monitoring device 1 executes the monitoring process shown in FIG. 10, and initializes the tracking period, the determination period, and the variables M and N (C1), and then scans the monitoring area R1 with the area sensor device 2 (C2) , Detects an object in the monitoring area R1 and specifies a mobile (C3). Subsequently, the latest mobile object or an untracked mobile object is set as a tracking target (C4).
- the latest mobile object means the most newly identified mobile object among mobile objects newly identified in the monitoring area R1. That is, the monitoring apparatus 1 sets a moving object as a tracking target when a new moving object intrudes into the monitoring area R1 when the mobile object is newly specified in the monitoring area R1.
- the untracked moving object means a moving object that has not been set as a tracking target yet among the newly identified moving objects.
- the monitoring device 1 When a plurality of moving objects are newly specified in the monitoring area R1, it is necessary to select one of the moving objects and set it as a tracking target.
- the monitoring device 1 When a plurality of moving objects are newly identified, the monitoring device 1 according to the present embodiment preferentially sets moving objects close to the boundary of the monitoring area R1 as tracking targets. For this reason, when a plurality of moving objects are specified at the same time, moving objects which are not set as tracking targets are present in the monitoring area R1. Therefore, if there is an untracked moving object, the monitoring device 1 sets it as a tracking target.
- the monitoring device 1 determines whether the response time is longer than the predicted time (C5).
- the response time is the time required to automatically track the mobile object newly set as the tracking target, and the prediction time is that the mobile object reaches the key monitoring target (exit G). It is the time that is expected to be needed.
- the moving object Mb1 is specified first on the left end side of the monitoring area R1 in the figure, and the moving object Mb2 is newly specified in a state of automatically tracking the moving object Mb1. I suppose.
- the zoom function is controlled to focus on the moving object Mb2, and the captured image is viewed It is necessary to identify the mobile.
- the time required for this is the response time.
- the time which is expected to be required for the mobile object Mb2 to reach the entrance / exit G is the prediction time.
- the response time and the prediction time are calculated based on the fact that the size of the monitoring area R1 and the position of the entrance / exit G are determined in advance, and the distance between the mobile Mb2 and the entrance / exit G can be determined from position information. can do.
- the monitoring device 1 executes the determination process shown in FIG. 4 (C6) as in the first embodiment, and the tracking cancellation condition is If not (C7: NO), the tracking target is automatically tracked (C8). Thereafter, the tracking period is initialized (C9), and if the determination period has not elapsed (C10: NO), if the determination period has elapsed (C10: YES), the determination period and variable M are initialized (C11) Then, the process proceeds to step C2. Then, the identification of the moving object, the setting of the tracking target, and the determination processing are repeated.
- the field of view of the imaging camera 20 may be frequently switched. That is, although the number of imaging cameras 20 installed and the like are set according to the installation situation of the monitoring apparatus 1 indicating how many mobile bodies are assumed, etc. when there are more mobile bodies than expected In some cases, automatic tracking may not be in time. For example, as shown in FIG. 12, it is assumed that a moving object M21 is newly identified at time t1 during the automatic tracking of the moving object M20. In this case, the monitoring device 1 sets the moving object M20 as a tracking target and performs automatic tracking. Thereafter, as shown in FIG. 13, when mobile M22 is newly specified at time t2, mobile M22 is set as a tracking target and is automatically tracked, and thereafter, as shown in FIG. When the moving object M23 is specified, the moving object M23 is set as a tracking target to perform automatic tracking.
- the monitoring apparatus 1 opens the determination process of step C6 every time the tracking object is set, and the tracking object is switched, so that the determination based on the above-described determination criterion A and determination criterion B is performed. Is going. Then, for example, when it is determined that the tracking release condition is satisfied at time t3 shown in FIG. 14 (C7: YES), the automatic tracking is released, and as shown in FIG. Then, the fixed point is monitored at a wide angle in the entire monitoring area R1 (C12). At this time, the angle of view of the imaging camera 20 is the angle of view ⁇ .
- the emphasis monitoring area includes the entrance / exit G which is the emphasis monitoring target.
- step C13 after NO, the process proceeds to step C12) as in the first embodiment.
- the control method of the present embodiment described above the following effects can be obtained.
- the most specific moving object is set as a tracking target and the camera device 3 performs automatic tracking, so that the moving object intruding into the monitoring area R1, ie, the observer A mobile object desired to be monitored can be set as a tracking target.
- the tracking target by setting the most recently identified moving object as the tracking target, it is possible to monitor the moving object at the initial stage of the intrusion. It is assumed that it will take some time statistically for the moving object to reach a position that should be really protected, such as a focus monitoring target, so the tracking time should be fully used to generate a lot of information (information obtained by imaging) Therefore, the monitoring accuracy can be enhanced and the role as a monitoring device can be sufficiently performed.
- the moving objects closer to the boundary of the monitoring area R1 are sequentially set as tracking objects and repeated automatic tracking. It can be set to
- being close to the boundary of the monitoring area R1 means that it is easy to leave the monitoring area R1. Therefore, when a plurality of moving objects are specified, setting a tracking object from a moving object closer to the boundary of the monitoring area R1 to preferentially monitor moving objects likely to move out of the monitoring area R1 it can. As a result, even if a plurality of moving objects are identified simultaneously, it is possible to prevent the moving objects entering the monitoring area R1 from leaving the monitoring area R1 without being monitored.
- the focus monitoring area is monitored at a wide angle by the camera device 3 at a wide angle, so at least the moving object is imaged even when the automatic tracking is not in time. It becomes possible.
- the focus monitoring area R2 is enlarged and the fixed point is monitored by the camera device 3; As in the embodiment, the field of view of the camera device 3 is fixed, and the mobile object can be identified.
- the focus monitoring area R2 is enlarged and the fixed point is monitored by the camera device 3 as in the first embodiment.
- the field of view of the camera device 3 is fixed, and the mobile object can be identified. Since the key monitoring area R2 is set in the entire monitoring area R1, the entire monitoring area R1 can be monitored even if fixed point monitoring is performed, and the possibility of lowering the monitoring performance is suppressed. be able to.
- the third embodiment is different from the second embodiment in that a desired moving body can be selected when performing fixed point monitoring at a wide angle.
- symbol is attached
- FIG. 17 detailed description of processing common to the monitoring processing of the second embodiment shown in FIG. 10 will be omitted.
- a target selecting unit 31 is provided in the monitoring device 4.
- the target selection unit 31 is for selecting which mobile object to be set as a tracking target among mobile objects present in the monitoring area R1, and an illustration in which a selection operation by a security guard or the like is input It is comprised by input means, such as a mouse
- the selection of the tracking target is performed by selecting a desired moving object from the moving object (image of the imaging camera 20) displayed on the display unit 30. The flow of processing for selecting a tracking target will be described below.
- the monitoring device 1 executes the monitoring process shown in FIG. 17 and, after initializing the tracking period, the determination period, and the variables M and N (D1), scans the monitoring area R1 with the area sensor device 2 (D2) Then, the object in the monitoring area R1 is detected and the moving object is specified (D3), and the tracking target is set (D4).
- a mobile body closest to the entrance G may be set as in the first embodiment, or a latest mobile body may be set as in the second embodiment, or the monitoring area
- the mobiles in R1 may be set in order or randomly.
- the monitoring device 1 executes the determination process shown in FIG. 4 as in the first embodiment (D5), and if the tracking cancellation condition is not satisfied (D6: NO), the tracking object is automatically tracked (D6) D7). Thereafter, the tracking period is initialized (D8), and if the determination period has not elapsed (D9: NO), if the determination period has elapsed (D9: YES), the determination period and variable M are initialized (D10) Then, the process proceeds to step D2.
- the process of identifying and judging the moving object is repeated, and when the tracking cancellation condition is satisfied (D6: YES), as shown in FIG.
- Fixed points are monitored at a wide angle in the focus monitoring area (D11).
- the monitoring device 1 sets the entire area of the monitoring area R1 as the priority monitoring area as in the second embodiment.
- the monitoring device 1 determines whether the tracking target is selected (D12).
- the object selection unit 31 is configured by a touch panel, it becomes possible to select a desired moving object by selecting one of the moving objects displayed on the display unit 30 by a touch operation.
- the mobile unit ID (a unique number assigned when the mobile unit is specified by the area sensor device 2) may be displayed on the display unit 30, and a desired mobile unit ID may be selected by a keyboard or the like. In any case, as long as the mobile unit can be selected, any configuration may be used.
- the monitoring device 1 When the tracking target is selected (D12: YES), the monitoring device 1 automatically tracks the selected tracking target (D7). At this time, fixed point monitoring is canceled. On the other hand, when the tracking target is not selected (D12: NO), fixed point monitoring is continued until the fixed point monitoring period ends (D13: after NO, the process proceeds to step D11). As described above, the monitoring device 1 can set a mobile object desired by the observer as a tracking target even when a plurality of mobile objects exist in the monitoring area R1.
- the following effects can be obtained.
- the fixed point monitoring of the focus monitoring area R2 is performed by the camera device 3 at a wide angle, the moving bodies in the focus monitoring area R2 are imaged It is possible to As a result, even when a plurality of mobile objects intrude into the monitoring area R1, it is possible to monitor at least mobile objects in the focus monitoring area R2.
- moving bodies in a positional relationship in which the field of view is likely to switch may be collectively brought into the field of view by wide-angle viewing, so that the same image can be captured in a long time to easily identify the moving body of interest.
- the focus monitoring area R2 is enlarged and the fixed point is monitored by the camera device 3;
- the field of view of the camera device 3 is fixed, and the situation in the monitoring area can be grasped without omission, such as the moving situation of the moving object and how much object is present in the monitoring area.
- fixed point monitoring is performed in a state in which the focus monitoring target is in the field of view, it is possible to suppress the possibility that the monitoring performance is degraded.
- the focus monitoring area R2 is enlarged and the fixed point is monitored by the camera device 3 as in the first embodiment.
- the field of view of the camera device 3 is fixed, and the situation in the monitoring area can be grasped without exception. Since the key monitoring area R2 is set in the entire monitoring area R1, the entire monitoring area R1 can be monitored even if fixed point monitoring is performed, and the possibility of lowering the monitoring performance is suppressed. be able to. Since the target setting unit is provided to enable selection of the mobile object to be set as the tracking target, the mobile object desired by the observer can be reliably set as the tracking target.
- FIG. 4 a control method according to a fourth embodiment of the present invention will be described with reference to FIG.
- the fourth embodiment is different from the first embodiment in the aspect of setting the tracking target.
- the configuration of the monitoring apparatus 1 is the same as that of the first embodiment, and thus will be described with reference to FIG. Further, in the monitoring process shown in FIG. 18, detailed description of the process common to the monitoring process of the first embodiment shown in FIG. 3 will be omitted.
- the monitoring device 1 executes the monitoring process shown in FIG. 18, scans the monitoring area R1 with the area sensor device 2 (E1), detects an object in the monitoring area R1, and identifies a moving object (E2) , Set tracking targets (E3).
- a mobile body closest to the entrance G may be set as in the first embodiment, or a latest mobile body may be set as in the second embodiment, or the monitoring area
- the mobiles in R1 may be set in order or randomly.
- the monitoring device 1 determines whether the tracking release condition is satisfied (E4).
- the monitoring device 1 sets the following determination criteria as the tracking cancellation condition in addition to the determination criteria A and the determination criteria B described above.
- Judgment criterion C The response time required to automatically track a mobile object newly set as a tracking target is longer than the predicted time required for the mobile object newly set as a tracking target to reach the key monitoring target Long time.
- Judgment criterion D The number of identified mobile objects exceeds the preset upper limit number of mobile objects.
- the upper limit number of mobile objects can be set based on the size of the monitoring area R1 or the like. For example, assuming that the moving object is a person, the time required to cross the monitoring area R1 is assumed in advance based on the size of the monitoring area R1 and the walking speed of the person, and the assumed time and one automatic tracking It is conceivable to set the upper limit number of mobile objects, etc., from the minimum time required for
- Judgment criteria E The period in which the focus monitoring target or the focus monitoring area R2 is not monitored exceeds the preset unmonitored upper limit value.
- the monitoring apparatus 1 determines that the tracking release condition is satisfied when any of the above-described determination criteria A to E is satisfied.
- the processing for the determination reference A and the determination reference B is common to the determination processing shown in FIG. 4 of the first embodiment, and the processing for the determination reference C is common to the processing at step C5 of the second embodiment. The description is omitted. Note that, in FIG. 18, the process of initializing the tracking period, the determination period, and the variables M and N is omitted.
- the monitoring device 1 cancels the automatic tracking as the tracking cancellation condition is satisfied. This is because when the moving object upper limit number is exceeded, it can be predicted that switching of the field of view frequently occurs.
- the process for the determination criterion D may be performed at the time of specifying the mobile body, that is, after step E2 and before step E3.
- the monitoring device 1 cancels the automatic tracking because the tracking cancellation condition is satisfied when the period in which the focus monitoring target or the focus monitoring area R2 is not monitored exceeds the unmonitored upper limit set in advance. Do. For example, when automatically tracking the latest mobile unit as in the second embodiment, if a new mobile unit is specified, the tracking target is switched to the new mobile unit. For this reason, even if the moving object specified earlier intrudes into the emphasis monitoring area R2, the moving object located in the vicinity of the emphasis monitoring area R2 is not monitored since the moving object is not a tracking target .
- the period in which the focus monitoring area R2 is not monitored becomes longer. Therefore, when the unmonitored upper limit value is exceeded, by monitoring the priority monitoring area R2 once, it is prevented that the period during which the priority monitoring area R2 is not monitored becomes long.
- the monitoring apparatus 1 determines whether the tracking release condition is satisfied based on the above-described determination standard, and when the tracking release condition is not satisfied (E4: NO), automatically tracks the tracking target (E5). Then, the process goes to step E1 to repeat the processes of object detection, mobile object identification, and tracking target setting.
- the monitoring device 1 enlarges the priority monitoring area R2 and performs fixed point monitoring as shown in FIG. 9 of the first embodiment (E6) The fixed point monitoring is continued until the fixed point monitoring period ends (E7: after NO, shift to step E1).
- the monitoring device 1 expands the priority monitoring area R2 and performs fixed point monitoring, even if there are a plurality of moving objects in the monitoring area R1. It is possible to monitor the vicinity of the entrance G to be monitored in a focused manner.
- the following effects can be obtained.
- the focus monitoring area is expanded and fixed point monitoring is performed by the camera device 3, so movement existing in the vicinity of the focus monitoring target It is possible to identify the body and to prevent the deterioration of the monitoring performance in the area to be importantly monitored.
- the inside of the focus monitoring area R2 is enlarged and imaged, it is possible to pick up the movable body in the focus monitoring area R2 in a distinguishable manner. As a result, even when a plurality of mobile objects intrudes into the monitoring area R1, at least the mobile objects in the priority monitoring area R2 desired by the monitor can be monitored.
- the focus monitoring area R2 is enlarged and fixed point monitoring is performed by the camera device 3. As a result, the field of view of the camera device 3 is fixed, and the mobile object can be identified.
- the focus monitoring area R2 is enlarged and the camera device is expanded. Since fixed point monitoring is performed in 3, the field of view of the camera device 3 is fixed, and a mobile can be identified.
- the focus monitoring area R2 is enlarged and the fixed point is monitored by the camera device 3. Therefore, even if the automatic tracking is not in time, the focus is the same as in the first embodiment. It is possible to at least image the moving object located at the place to be monitored.
- the focus monitoring area R2 is enlarged and fixed point monitoring is performed by the camera device 3. Therefore, even in a situation where automatic tracking is not in time
- at least a mobile object located at a place to be intensively monitored can be imaged.
- the focus monitoring area R2 When the period in which the focus monitoring area R2 is not monitored exceeds the unmonitored upper limit, the focus monitoring area R2 is expanded and fixed point monitoring is performed by the camera device 3, a period in which the focus monitoring target or the focus monitoring area R2 is not monitored Can prevent the monitoring condition from becoming worse.
- a stationary state for example, a person moving a hand but not moving the position
- tracking is temporarily performed as "not a moving body”.
- the focus monitoring target or the focus monitoring area R2 can be monitored.
- the present invention is not limited to what is illustrated in each embodiment, and can be modified or expanded as follows, for example.
- the numerical values shown in each embodiment are merely examples, and the present invention is not limited thereto.
- detection of an object and identification of a moving object may be performed based on data obtained by a plurality of scans instead of one scan.
- the flow of processing waiting during the fixed point monitoring period is illustrated for simplification of the description, but the monitoring device 1 performs detection of an object and identification of a moving object even during the fixed point monitoring period.
- the mobile object specified during the fixed point monitoring period is automatically tracked. If it is necessary for the observer to be aware, it is necessary to continue imaging the same moving object for about 2 seconds.
- the monitor unit 4 is provided with a storage unit, the configuration can be used to reproduce captured images. Even if the period during which imaging of the same moving object is continued can be shortened, confirmation can be made later. Therefore, the response time and the tracking period can be appropriately set based on the configuration of the monitoring device 1 or the like.
- the determination criteria A to E may be combined in any way. That is, although the determination criteria A and B are adopted in the first embodiment, the determination criteria C to E may be adopted, and only the determination criterion D is adopted, and the fixed point is monitored if the number of moving bodies is large. You may do so. Also in the second embodiment and the second embodiment, the determination criteria A to E may be combined in any way.
- a mobile identified in the monitoring area includes a mobile that has stopped in the monitoring area and is determined to be “not a mobile” once, but then resumes moving. ing.
- 1 is a monitoring device
- 2 is an area sensor device (optical distance meter)
- 3 is a camera device.
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Abstract
Description
また、追尾対象を単に切り替えるだけでは、監視エリア内の移動体をもれなく自動追尾することができず、監視装置としての役割を十分に果たすことができない(すなわち、監視性能が低下する)おそれがある。
また、本発明は、上述した課題を解決するためになされたものであり、監視エリアに複数の移動体が存在する場合であっても、監視性能が低下することを防止することができる、移動体を監視する装置及び方法が提供することを第2の目的とする。
以下、本発明の第1実施形態について、図1から図9を参照しながら説明する。
図1に示すように、本実施形態の制御方法を適用する監視装置1は、エリアセンサ装置2、カメラ装置3、およびモニタ装置4から構成されている。
モニタ装置4は、表示部30を備えており、カメラ装置3にて撮像した画像を表示する。このモニタ装置4は、例えば図示しない警備室等に設けられており、警備員などによって監視が行われている。
監視装置1は、図3に示す監視処理を実行しており、処理が開始されると、まず追尾期間、判定期間、変数M、Nを初期化する(A1)。詳細は後述するが、各項目の意味は以下の通りである。
・判定期間:予め設定されている期間。
・変数M:判定期間内に追尾対象が切り替えられた回数を計数するための変数。後述するように、変数Mの値が予め定められている判定上限数を超えると撮像カメラ20の視野が頻繁に切り替わっていると判定される。
・判定基準A:予め定められている判定期間内に追尾対象が切り替えられた回数が判定上限数を超えたこと。
・判定基準B:同一の移動体を自動追尾した追尾期間が予め設定されている下限値を下回った回数が、連続して下限判定回数以上となったこと。本実施形態では、追尾期間が下限値を連続して3回下回ったか否か。
なお、この判定処理は図3に示すように監視処理の流れの一部として実行されるものであるものの、説明の簡略化のために、判定基準Aおよび判定基準Bによる処理の流れをここで一度に説明しておく。
監視装置1は、判定処理において、追尾対象が切り替えられたかを判定しており(B1)、追尾対象が切り替えられていない場合には(B1:NO)、変数Mが判定上限数を超えたかを判定する(B2)。この変数Mは、所定期間内で追尾対象が切り替えられるごとにインクリメント(B1:YES、B4)される一方、判定期間が経過すると初期化される(図3のステップA9:YES、A10)。このため、変数Mの値を参照することにより、判定期間内に何回追尾対象が切り替えられたか、すなわち、撮像カメラ20の視野が何回切り替えられたかを把握することができる。
監視装置1は、追尾対象が切り替えられた場合には(B1:YES)、上記した変数Mをインクリメントした後(B4)、追尾期間が下限値を下回るかを判定する(B5)。この追尾期間は、自動追尾が開始されるごとに初期化(図3のステップA8)されるものであり、前回追尾対象に設定された移動体を自動追尾してから現時点までに経過した期間(同一の移動体を自動追尾した期間)を示している。
判定処理からリターンすると、監視装置1は、追尾解除条件が成立したかを判定し(A6)、追尾解除条件が成立していなければ(A6:NO)、ステップA4にて設定された追尾対象を自動追尾し(A7)、追尾期間を初期化する(A8)。その後、判定期間が経過していれば(A9:YES)、判定期間および変数Mを初期化して(A10)、ステップA2に移行する。一方、判定期間が経過していなければ(A9:NO)、そのままステップA2に移行する。
監視エリアR1内に存在する移動体のうち、重点監視対象(本実施形態では、出入り口G)に最も近い移動体を追尾対象に設定してカメラ装置3により自動追尾するので、重点的に監視すべき場所に最も近い移動体、すなわち、監視者が監視対象として所望する移動体を、追尾対象に設定することができる。
このとき、重点監視エリアR2は重点監視対象を含めた範囲として設定されているので、すなわち、重点監視対象が視野に入った状態で定点監視することから、監視性能が低下するおそれを抑制することができる。
以下、本発明の第2実施形態による制御方法について、図10から図15を参照しながら説明する。第2実施形態では、複数の移動体を特定した際にどの移動体を追尾対象に設定するかが、第1実施形態と異なっている。なお、監視装置の構成は第1実施形態と共通するので同一の符号を付して説明する。また、図10に示す監視処理において、図3に示した第1実施形態の監視処理と共通する処理については、詳細な説明は省略する。
追尾対象を設定すると、監視装置1は、応答時間が予測時間よりも長くなるかを判定する(C5)。ここで、応答時間とは、新たに追尾対象に設定された移動体を自動追尾するまでに要する時間であり、予測時間とは、その移動体が重点監視対象(出入り口G)まで到達するのに要すると予測される時間である。具体的には、図11に示すように、例えば監視エリアR1の図示左端側で移動体Mb1が先に特定され、その移動体Mb1を自動追尾している状態で新たに移動体Mb2が特定されたとする。
監視エリアR1内で特定された移動体のうち、最も新しく特定された移動体を追尾対象に設定してカメラ装置3により自動追尾するので、監視エリアR1内に侵入した移動体、すなわち、監視者が監視したいと所望する移動体を追尾対象に設定することができる。
同一の移動体を自動追尾した追尾期間が下限値を連続して下回った回数が下限判定回数以上となった場合には重点監視エリアR2を拡大してカメラ装置3で定点監視するので、第1実施形態と同様に、カメラ装置3の視野が固定され、移動体を識別することができるようになる。
重点監視エリアR2を監視エリアR1の全域に設定しているので、定点監視している場合であっても監視エリアR1の全域を監視対象とすることができ、監視性能が低下するおそれを抑制することができる。
以下、本発明の第3実施形態による制御方法について、図16および図17を参照しながら説明する。第3実施形態では、広角にて定点監視している際、所望の移動体を選択可能である点が第2実施形態と異なっている。なお、監視装置の構成について第1実施形態と共通する部位には同一の符号を付して説明する。また、図17に示す監視処理において、図10に示した第2実施形態の監視処理と共通する処理については、詳細な説明は省略する。
このように、監視装置1は、監視エリアR1に複数の移動体が存在する場合であっても、監視者が所望する移動体を追尾対象に設定可能としている。
監視エリアR1内に複数の移動体が特定された際、追尾解除条件が成立した場合には重点監視エリアR2をカメラ装置3で広角に定点監視するので、重点監視エリアR2内の移動体を撮像することが可能となる。これにより、監視エリアR1内に複数の移動体が侵入した場合であっても、少なくとも重点監視エリアR2内の移動体を監視することができる。
この場合、広角にすることで視野が切り替わる可能性のある位置関係の移動体がまとめて視野内に入ってくるため、同じ画像が長い時間で撮像され対象の移動体の判別がし易くなる。
重点監視エリアR2を監視エリアR1の全域に設定しているので、定点監視している場合であっても監視エリアR1の全域を監視対象とすることができ、監視性能が低下するおそれを抑制することができる。
対象設定部を設けて追尾対象に設定する移動体を選択可能としているので、監視者が所望する移動体を確実に追尾対象に設定することができる。
以下、本発明の第4実施形態による制御方法について、図18を参照しながら説明する。第4実施形態では、追尾対象を設定する態様が第1実施形態と異なっている。なお、監視装置1の構成は第1実施形態と共通するので図1も参照しながら説明する。また、図18に示す監視処理において、図3に示した第1実施形態の監視処理と共通する処理については、詳細な説明は省略する。
・判定基準C:新たに追尾対象に設定された移動体を自動追尾するまでに要する応答時間が、新たに追尾対象に設定された移動体が重点監視対象まで到達するのに要する予測時間よりも長いこと。
監視装置1は、上記した判定基準A~Eのいずれかが満たされた場合に、追尾解除条件が成立したと判定する。判定基準Aおよび判定基準Bに対する処理は第1実施形態の図4に示した判定処理と共通し、判定基準Cに対する処理は第2実施形態のステップC5の処理と共通するので、それらの詳細な説明は省略する。なお、図18では、追尾期間や判定期間、変数M、Nの初期化の処理については図示を省略している。
監視エリアR1内に複数の移動体が特定された際、追尾解除条件が成立した場合には重点監視エリアを拡大してカメラ装置3にて定点監視するので、重点監視対象の近傍に存在する移動体を識別することができ、重要的に監視すべき範囲における監視性能が低下することを防止できる。
本発明は、各実施形態にて例示したものに限定されることなく、例えば以下のように変形あるいは拡張することができる。
各実施形態で示した数値は例示であり、これに限定されない。
物体を検知する場合、1回の走査ではなく、複数回の走査により得られたデータに基づいて物体の検知、移動体の特定を行ってもよい。
監視者が認識することが必要な場合、2秒程度は同一の移動体を撮像し続けることが必要となるが、例えばモニタ装置4に記憶部を設けて撮像した画像を再生できる構成とすれば、同一の移動体を撮像し続ける期間を短縮しても後から確認することができる。このため、応答時間や追尾期間は、監視装置1の構成等に基づいて、適宜設定することができる。
各実施形態において、監視エリア内で特定された移動体とは、監視エリア内で停止して一旦は「移動体では無い」と判定されたものの、その後移動を再開したような移動体も含まれている。
Claims (15)
- 予め設定されている監視エリアの移動体を監視する方法において、
光学式距離計により前記監視エリア内を走査して物体を検知し、
前記検知した物体のうち移動体を特定し、
前記監視エリア内で最も新しく特定された移動体を追尾対象に設定し、
前記追尾対象に設定された移動体をカメラ装置により自動追尾する
ことを特徴とする方法。 - 新たに特定された移動体が複数存在する場合、前記監視エリアの境界に近い移動体から順に追尾対象に設定して自動追尾することを繰り返し、特定された全ての移動体を追尾対象に設定する
ことを特徴とする請求項1に記載の方法。 - 新たに追尾対象に設定された移動体を自動追尾するまでに要する応答時間が、その移動体が前記監視エリア内に予め設定されている重点監視対象まで到達するのに要する予測時間よりも長い場合、前記重点監視対象を含む重点監視エリアを前記カメラ装置で広角に定点監視する
ことを特徴とする請求項1または2に記載の方法。 - 同一の移動体を自動追尾した追尾期間が予め設定されている下限値を連続して下回った回数が下限判定回数以上となった場合、前記監視エリア内に予め設定されている重点監視対象を含む重点監視エリアを前記カメラ装置で広角に定点監視する
ことを特徴とする請求項1から3のいずれか一項に記載の方法。 - 予め定められている判定期間内に追尾対象が切り替えられた回数が予め定められている判定上限数を超えた場合、前記監視エリア内に予め設定されている重点監視対象を含む重点監視エリアを前記カメラ装置で広角に定点監視する
ことを特徴とする請求項1から4のいずれか一項に記載の方法。 - 前記重点監視エリアを前記カメラ装置で広角に定点監視している際、当該重点監視エリア内のいずれかの移動体が選択されると、選択された移動体を追尾対象に設定して自動追尾する
ことを特徴とする請求項3から5のいずれか一項に記載の方法。 - 前記監視エリア内に複数の移動体が特定されたか否かを判定し、
前記複数の移動体が特定されたと判定された場合、前記カメラ装置による自動追尾を解除するために予め設定されている追尾解除条件が成立したか否かを判定し、
前記追尾解除条件が成立したと判定された場合、前記監視エリア内の重点監視対象を含む予め設定されている重点監視エリアを拡大して前記カメラ装置で定点監視する
ことを特徴とする請求項1に記載の方法。 - 前記追尾解除条件として、同一の移動体を自動追尾した追尾期間が予め設定されている下限値を連続して下回った回数が下限判定回数以上となったこと、を設定する
ことを特徴とする請求項7に記載の方法。 - 前記追尾解除条件として、予め定められている判定期間内に追尾対象が切り替えられた回数が予め定められている判定上限数を超えたこと、を設定する
ことを特徴とする請求項7または8記載の方法。 - 前記追尾解除条件として、新たに追尾対象に設定された移動体を自動追尾するまでに要する応答時間が、新たに追尾対象に設定された移動体が前記重点監視対象まで到達するのに要する予測時間よりも長いこと、を設定する
ことを特徴とする請求項7から9のいずれか一項に記載の方法。 - 前記追尾解除条件として、特定された移動体の数が予め設定されている移動体上限数を超えたこと、を設定する
ことを特徴とする請求項7から10のいずれか一項に記載の方法。 - 前記追尾解除条件として、前記重点監視対象または前記重点監視エリアが監視されていない期間が予め設定されている未監視上限値を超えたこと、を設定する
ことを特徴とする請求項7から11のいずれか一項記載の方法。 - 重点監視エリアとして、少なくとも複数の移動体を撮像可能な範囲を設定する
ことを特徴とする請求項7から12のいずれか一項に記載の方法。 - 光学式距離計により監視エリア内を走査して物体を検知し、検知した物体のうち移動体を特定し、特定した移動体を追尾対象に設定してカメラ装置により自動追尾する、移動体を監視する方法であって、
前記監視エリア内に複数の移動体が特定されたか否かを判定し、
前記複数の移動体が特定されたと判定された場合、前記カメラ装置による自動追尾を解除するために予め設定されている追尾解除条件が成立したか否かを判定し、
前記追尾解除条件が成立したと判定された場合、前記監視エリア内の重点監視対象を含む予め設定されている重点監視エリアを拡大して前記カメラ装置で定点監視する
ことを特徴とする方法。 - 予め設定されている監視エリアを監視する装置において、
光学式距離計により前記監視エリア内を走査して物体を検知する手段と、
前記検知した物体のうち移動体を特定する手段と、
前記監視エリア内で最も新しく特定された移動体を追尾対象に設定する手段と、
前記追尾対象に設定された移動体をカメラ装置により自動追尾する手段と、
を備えた、ことを特徴とする装置。
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