KR101086372B1 - DVR and Vison Monitoring Method thereof - Google Patents

Abstract

Discs and a video surveillance method thereof are disclosed. The DVR of the present invention divides a surveillance area into a plurality of zones and performs video surveillance while storing video signals photographed by a plurality of cameras, and is recognized in the surveillance region through video analysis of the video signals. While tracking and monitoring the movement of an object, information about camera image files included in the tracking can be managed separately and provided to search and playback.

Description

DVR and its monitoring method {DVR and Vison Monitoring Method about}

The present invention relates to a DV for dividing a surveillance area into a plurality of zones and storing video signals photographed by a plurality of cameras. More particularly, the present invention relates to a DVB in a surveillance region through video analytics. The present invention relates to a television and a video surveillance method for tracking and monitoring a movement of a recognized object.

Digital Video Recorder (DVR) is a video surveillance and storage means for converting video signals input through an analog camera into digital video signals, compressing them, and storing them in a hard disk. It is replacing CCTV market by Video Cassette Recorder.

The DVD 100 stores the video signal on the hard disk, and thus there is no deterioration due to the repeated playback and recording of the tape as in the VRT, and the analog video signal is compressed and stored as a digital signal for quick search and event-specific search. It may provide a convenient user interface such as.

In addition, recently, IP cameras, which have improved image quality and have a role of video surveillance, have emerged, and DVRs are also accepting such IP cameras.

On the other hand, when the DVR is installed as a means of video surveillance, most of them provide a function of simply recording and playing back a video of a target area, but recently, there is a demand for a function of recognizing and tracking an object through video analysis. There is.

An object of the present invention is to divide the surveillance area into a plurality of zones and perform video surveillance while storing the video signals photographed by a plurality of cameras, and the object recognized in the surveillance region through video analytics for the video signals. The present invention provides a television and a video surveillance method for tracking and monitoring a motion of a camera.

In order to achieve the above object, according to the present invention, the image storage method of the DV device for receiving an image from a plurality of cameras, each of which captures a plurality of surveillance areas to store the image file, the spatial connection of the plurality of surveillance areas Storing logical connections of the plurality of cameras based on path analysis of the moving object; Recognizing and tracking a moving object while monitoring an image input from a selected one of the plurality of cameras according to a monitoring event; If the object is not recognized during the tracking, recognizing a moving object with respect to an image input from a camera in a logical connection with the selected camera and continuing tracking; And generating connection information of an image file generated according to the tracking.

According to an embodiment of the present disclosure, if the object is not recognized during the tracking and there are a plurality of cameras logically connected to the selected camera, the monitoring method may be performed on the images inputted from all of the plurality of logically connected cameras. Recognizing a moving object; And continuously tracking a camera in which the moving object is recognized among the plurality of logically connected cameras.

Here, in the step of tracking continuously, if there are a plurality of moving objects recognized in the image input from the camera associated with the connection, the newly recognized object is tracked at the time of starting the tracking.

According to another exemplary embodiment of the present disclosure, a DV device receiving an image from a plurality of cameras respectively photographing a plurality of surveillance regions and storing a corresponding image file may include an image processor to perform the image tracking, and the plurality of surveillance regions. And a monitoring unit requesting the image processing unit to process an image input from one of the plurality of cameras based on the path analysis of the moving object according to the spatial connection of the plurality of cameras.

In addition to recording and reproducing image signals photographed by a plurality of cameras, the DVR may further track object paths for images input from the plurality of cameras based on path analysis of a moving object according to spatial connection of a surveillance area. By performing the analysis, the video file can be stored and played back intelligently according to the movement of the object moving the surveillance object.

Accordingly, the DV may have the same effect as if the manager captures the monitored object and records it while the manager selects the monitored camera according to the movement path of the target.

In addition, since such image analysis and tracking do not need to be performed on the entire video signal input from the entire installed camera, there is no problem that the overall system speed decreases according to the image processing.

1 is a block diagram of a DV system according to an embodiment of the present invention;
2 is a block diagram of a television according to an embodiment of the present invention;
3 is a diagram illustrating an example in which a camera is installed in a surveillance area; and
4 is a flowchart provided to explain an image monitoring method according to an embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the drawings.

Referring to FIG. 1, a digital video recorder (DVR) 100 according to an embodiment of the present invention may receive and process analog video signals provided by a plurality of analog cameras 11, 13, and 15. 30 is connected to the digital video signal provided by the IP camera (17, 19) can be processed.

Furthermore, the DB 100 is connected to an external device 50 such as a user's mobile phone through the IP network 30 to receive a predetermined control command from the external device 50 or process an image to the external device 50. The signal can be output or streamed.

Referring to FIG. 2, the DV 100 may convert a video signal input from an analog camera into a digital video signal, and convert the digital video signal into an analog video signal for output to an external monitor. A video encoder 113, an image processor 115 for combining various images with the digital video signal, a codec 117 for compressing and decompressing the digital video signal, and an IP network 30, A communication interface unit 119 for connecting to the external device 50 or the IP cameras 17 and 19, a storage medium 121 for storing the compressed video signal, and a control unit 130 for controlling the device.

Herein, the operation of the DB 100 will be briefly described, and a detailed description of the function as a general DB will be omitted. The analog video input from the analog cameras 11, 13, and 15 is converted into a digital video signal by the video decoder 111, and then other video signals are added or synthesized by the image processor 115 to the video encoder 113. The video encoder 113 converts the analog signal into an analog signal and outputs the analog signal. The image processor 115 provides an image signal to the codec 117 under the control of the controller 130 to be compressed and stored in the storage medium 121. Similarly, the digital video signal input from the IP cameras 17 and 19 through the communication interface unit 119 is stored in the storage medium 119, or the codec 117, the image processor 115, and the video encoder 113 are stored. Through the monitor.

The overall operation of the DVR 100 is controlled by the controller 130. Furthermore, the controller 130 provides an intelligent image tracking function characteristic of the present invention.

To this end, the controller 130 includes an image processor 131, a monitor 133, and a recording / playback processor 135. The block diagram of FIG. 2 is not a reflection of hardware as it is, but may be different from the actual hardware configuration as shown in the concept of functional blocks, but in any form, if the functional configuration is the same as the present invention, it is included in the rights of the present invention. It must be understood. For example, although the image processor 131 is illustrated as being included in the controller 130 in FIG. 2, the image processor 131 may be provided separately from the controller 130.

The image processor 131 recognizes a moving object by performing object recognition on an image input from a camera requested by the monitoring unit 133 to process the moving camera. When the moving object is detected, the image processor 131 provides the monitoring unit 133 with detection information of the corresponding object. Here, the detection information includes at least information on a time when a new object appeared in the image of the requested camera and a time when the new object disappeared.

The object recognition and tracking process of the image processor 131 may use various known methods. For example, general object recognition may be obtained from a subtraction operation of an image of a previous frame and an image of a new frame, and tracking of the detected object may also use a known algorithm.

The monitoring unit 133 performs a monitoring algorithm for the area to be monitored with information about a logical connection relationship (or logical connection relationship between each monitoring area) of each camera to be described below, and stores the result in the storage medium 121. Store in

The monitoring unit 133 requests the image processing unit 131 to recognize the intruder (object) through the analysis of the image input from the specific camera based on the monitoring algorithm, and based on the recognition result provided from the image processing unit 131. Based on the monitoring result is generated as a log file and stored in the storage medium 121.

The recording / playback processing unit 135 controls an operation for recording and reproducing a basic video signal provided by the DVR 100, and requests an image input from a specific camera at the request of the monitoring unit 133. It may be managed to be stored as a separate image file from time, or may be given a separate tag or metadata.

Hereinafter, before describing the operation of the DB 100 of the present invention, the configuration of the security surveillance camera according to the path analysis of the moving object according to the spatial connection of the surveillance region and its logical connection will be described.

3 shows a building to be monitored, the first surveillance region B1 by the first camera 11, the second surveillance region B2 by the second camera 13, and the third camera 15. The third surveillance region B3 by, the fourth surveillance region B4 by the fourth camera 17, and the fifth surveillance region B5 by the fifth camera 19 are shown. In other words, each of the surveillance areas B1 to B5 is divided by the cameras 11 to 19.

Each surveillance zone or each camera is connected to each other logically by moving path analysis based on the purpose of the surveillance, the spatial characteristics of the surveillance zone, and the characteristics of the object to be monitored (eg, intruder). For example, when the monitoring target is a human, an intruder who invades the first surveillance region B1 must pass through the third surveillance region B3, and the intruder who appears in the first surveillance region B1 is the fourth surveillance region (the next instant). What happens in B4) does not occur.

Accordingly, the logical connection relationship of each camera of FIG. 3, that is, the logical connection relationship of each surveillance region is shown in Table 1 below.

Camera no Logical connection camera First camera 2nd, 3 camera Second camera 1st, 3 camera Third camera 1st, 2nd, 5th camera 4th camera 5th camera 5th camera 3rd, 4th camera

According to Table 1, the fifth surveillance zone B5 → the third surveillance zone B3 → the first surveillance zone B1 is a possible connection, but the fifth surveillance zone B5 → the fourth surveillance zone B4 → The first surveillance region B1 is impossible because there is no connection relationship between the fourth surveillance region B4 and the first surveillance region B1.

Hereinafter, with reference to FIG. 4, the operation of the TV 100 of the present invention centering on the monitoring unit 133 and the image processing unit 131 will be described.

<Start Monitoring for Selected Surveillance Area According to Surveillance Event: Step S401>

First, when a monitoring event occurs, the monitoring unit 133 requests the image processor 131 to recognize and track an object of an image of a camera according to the corresponding event. Here, the monitoring event may be generated by a separate infrared sensor or a magnetic sensor, or may be made through analysis of the image of the entire camera installed in the monitoring area. In addition, the surveillance event may also occur due to a control command or a time setting of a user who selects a specific camera or a specific surveillance region.

Hereinafter, for convenience of description, there is an event caused by a user's control command requesting the monitoring of the first surveillance region B1, and after the event occurs, the object p enters the first surveillance region B1, 3 Assume that it has moved to the surveillance area B3. It is irrelevant whether or not the third surveillance region B3 is an surveillance region requested by the user.

<Video Surveillance (Object Recognition and Tracking) for Surveillance Initiated Area: Step S403>

At the request of the monitoring unit 133, the image processing unit 131 starts object recognition and tracking of an image input from a camera requested to be monitored (in the example of FIG. 3, the first camera). Object recognition, extraction, and tracking of the image processor 131 may be processed by a method known in the image processing field as described above.

When the moving object is extracted during image analysis, the image processor 131 provides the extracted fact to the monitoring unit 133 together with the extracted time information and starts tracking the extracted object.

When the object disappears from the image of the camera requested to be monitored after a certain time in accordance with the movement of the object and the escape of the surveillance region, the image processor 131 provides the monitoring unit 133 with the end time information to end the object tracking. do.

In the example of FIG. 3, when the intruder enters the first surveillance area B1, the image processing unit 131 starts object recognition and tracking, and when the intruder leaves the third surveillance area B3 which is a corridor, 1 The object disappears from the image input from the camera 11 and the image processor 131 ends the tracking of the object.

<Selection of surveillance area to track among logically connected surveillance areas: step S405>

When the monitoring unit 133 is notified of the end of object tracking for the requested camera image from the image processing unit 131, the monitoring unit 133 selects a camera (monitoring area) to be continuously tracked from a camera (or monitoring area) logically connected to the camera being tracked. do. To this end, the monitoring unit 133 requests the image processing unit 131 to track all of the logically connected cameras for a predetermined time. In an example, since the logically connected cameras of the first camera 11 are the second camera 13 and the third camera 15, the monitoring unit 133 may be configured for the second camera 13 and the third camera 15. The image processor 131 requests a monitoring of a predetermined time. In this case, the predetermined time may be determined in consideration of the moving capability of the object, the spatial characteristics of the surveillance region, and the like.

The image processor 131 monitors whether there is a newly displayed object with respect to the images of the cameras which are requested to be tracked for a set time at the request of the monitoring unit 133, and provides the monitoring result to the monitoring unit 133. As the object p moves from the first surveillance region B1 to the third surveillance region B3, the image processor 131 notifies the surveillance unit 133 that a new object is recognized in the third surveillance region.

In some cases, the second surveillance region B2 or the third surveillance region B3 may have a previously moving object. Even in this case, the image processing unit 131 extracts only the newly appearing object from the image of the surveillance area and provides the result to the monitoring unit 133.

If there is only one surveillance region logically connected to the trace-initiated surveillance region disclosed in operation S401, the operation S407 may be immediately performed without the operation S405.

<Start Monitoring for Traced Connection Surveillance Area: Step S407>

The monitoring unit 133 selects a surveillance area to be continuously tracked based on the result provided from the image processing unit 131 in operation S405, and recognizes and tracks the same object recognition and tracking as the operation S403 for the surveillance region to the image processing unit 131. request.

Steps S403 to S407 are repeated until the connected surveillance region to continue tracking is not selected because the moving object is not recognized. Accordingly, the image tracking of step S403 by step S401 becomes the primary tracking, and the tracking of step S403 repeated after that will be the secondary tracking.

<Save video of surveillance area to track>

The monitoring unit 133 requests the image processing unit 131 to process the image at step S401, S405, and S407, and requests the recording and reproducing unit 135 to store the corresponding image. Manages the information about each video file stored as one tracking information.

Accordingly, the monitoring unit 133 may provide tracking information to search of the monitoring result of the manager, and when the manager requests a playback, the monitoring unit 133 requests the recording and playback processing unit 135 to play a series of video files according to the tracking information. Can be.

In general, the recording / playback processing unit 135 may record all images of all cameras regardless of the request of the monitoring unit 133, but at least, the recording and reproducing processing unit may be stored as a separate image file from the requested time at the request of the monitoring unit 133. So that it can be managed or given a separate tag or metadata.

Although the above has been illustrated and described with respect to preferred embodiments of the present invention, the present invention is not limited to the above-described specific embodiments, it is usually in the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

Claims (5)

In the image storage method of the DV device for receiving an image from a plurality of cameras for shooting a plurality of surveillance areas, respectively, and stores the image file,
Storing logical connection relationships of the plurality of cameras based on path analysis of a moving object according to spatial connection of the plurality of surveillance areas;
Recognizing and tracking a moving object while monitoring an image input from a selected one of the plurality of cameras according to a monitoring event;
If the object is not recognized during the tracking, recognizing a moving object with respect to an image input from a camera in a logical connection with the selected camera and continuing tracking; And
And generating connection information of the image file generated according to the tracking.
The method of claim 1,
Recognizing a moving object with respect to an image input from all of the logically connected cameras when the object is not recognized during the tracking and there are a plurality of cameras logically connected to the selected camera; And
And continuing tracking with respect to the camera in which the moving object is recognized among the plurality of logically connected cameras.
The method according to claim 1 or 2,
In the step of continuing the tracking, when there are a plurality of moving objects recognized in the image input from the camera associated with the connection, the newly recognized object is tracked at the time when the tracking starts to continue Video surveillance method.
In the DV device for receiving an image from a plurality of cameras for capturing a plurality of surveillance areas, and stores the image file,
An image processor configured to recognize and track a moving object by processing an image input from the camera;
The image processing unit stores a logical connection relationship of the plurality of cameras based on the path analysis of the moving object according to the spatial connection of the plurality of surveillance regions, and performs image tracking of one selected camera among the plurality of cameras according to a surveillance event. Includes a monitoring unit requesting
If the object is not recognized during the tracking, the monitoring unit requests the image processing unit to continuously track a camera that is in logical connection with the selected camera, and generates connection information of an image file generated according to the continuous tracking. DV is characterized in that.
The method of claim 4, wherein
The monitoring unit,
If the object is not recognized during the tracking and there are a plurality of cameras logically connected to the selected camera, the image processing unit requests the image processing unit to track the image for a set time for all the logically connected cameras, and logically And a plurality of cameras connected to request the tracking of the newly recognized object.

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