KR20100138168A - Video surveillance system and video surveillance method thereof - Google Patents

Abstract

PURPOSE: A video surveillance system and a video surveillance method thereof are provided to store an image of a moving object when motion is detected in a surveillance area. CONSTITUTION: A motion detecting unit(23) detects motion from a surveillance area image. If the motion is detected, a surveillance control unit(24) makes photographing speed of a camera fast. An extracting unit(25) extracts an image of an object moved from continuously photographed images to assign a serial number to every extracted image. An output unit(27) outputs an image of a part where the motion is generated by reflecting a search condition about a part where the motion is generated.

Description

VIDEO SURVEILLANCE SYSTEM AND VIDEO SURVEILLANCE METHOD THEREOF}

The present invention relates to an image surveillance system and an image surveillance method of the system, and more particularly, to an image surveillance system for efficiently storing and retrieving a captured image and an image surveillance method of the system.

Recently, a digital video recorder (DVR) or a network video recorder (NVR) that can simultaneously monitor several areas has been commercialized. DVRs or NVRs are widely used for storing captured images and finding images associated with an event when an event occurs.

At this time, the searcher searches the image of interest through fast forwarding / rewinding the stored image from 2x to 16x. As such, since the searcher manually finds the image of interest, the searcher may have a low concentration due to eye fatigue and physical fatigue when the search is performed for a long time. This may adversely affect the retrieval of the image of interest.

On the other hand, the main parts that are mainly researched and developed in DVR or NVR are lossless and high-efficiency compression of video images, such as Moving Picture Experts Groups (MPEG) -4, Joints Photographic Coding Experts Group (JPEG) -2000, WAVELET, etc. Compress the captured image. However, in order to overcome the limited capacity of the storage device, the image quality is stored at a lower image quality. This may result in a lack of image information for later retrieving the desired image of interest.

In addition, there is no technology development in the field of retrieval technology for stored images.

Accordingly, the present invention provides a video surveillance system and a video surveillance method of the system that allows a searcher to quickly search for a desired image without deteriorating concentration when searching a large amount of stored image data.

In addition, the present invention saves the storage space by storing only the partial image in which the movement occurs, and intelligent search when retrieving image information by simultaneously storing the recording time information, position coordinate information, color information, image size information, etc. for the partial image It provides a video surveillance system that provides a function and a video surveillance method of the system.

In order to achieve the above object, the present invention stores only the moving object image when the movement occurs in the monitoring area, and also photographs and stores the entire monitoring area at regular intervals, and reflects the search condition input after the moving object image search request. A video surveillance system for outputting a moving object image and a video surveillance method of the system are provided.

More specifically, the video surveillance system according to an aspect of the present invention, a plurality of cameras for shooting each surveillance area; And a surveillance server configured to detect and store only a portion in which a motion occurs in the surveillance region image photographed by the camera, and to store the entire surveillance region image photographed through the camera at regular intervals separately from the motion detection.

The monitoring server may output a partial image in which a movement occurs by reflecting a search condition input after a search request for the portion in which the movement occurs.

The surveillance server may include a motion detector configured to detect a motion from the captured surveillance image; A monitoring controller which controls the photographing speed of the camera faster than before motion detection when motion is detected in the captured surveillance region image; An extracting unit extracting only an image of a moving object from images continuously photographed by the camera and assigning a serial number to each of the extracted images according to the photographing speed control of the monitoring controller; Data, shooting time information, and position coordinate information of the image to which the serial number is assigned are stored for each of the serial numbers, and recording time information, position coordinate information, color information, and image size information of the entire surveillance region photographed at each predetermined period. Storage device for storing with; And an output unit configured to output only a partial image in which a motion is generated by reflecting a search condition input after a search request for the portion in which the motion occurs.

If the search condition is not input after the search request for the portion in which the movement occurs, the output unit may synthesize the entire image of the surveillance region photographed at a predetermined period and the partial image in which the movement occurs or output only the partial image in which the movement occurs. have.

The search conditions may include a color for distinguishing a moving object, a moving direction of the moving object, a moving speed of the moving object, a cluster shape of the moving object, whether or not to synthesize the entire image of the moving object and the surveillance area, a search area, a search date, It may include at least one of the search time.

According to another aspect of the present invention, an image surveillance method of an image surveillance system includes: storing an entire image of a surveillance region photographed by a camera at regular intervals; Detecting and storing only a portion in which a motion occurs in the surveillance region image photographed at a period shorter than the predetermined period; And outputting a partial image in which a motion occurs by reflecting a search condition input after a search request for the portion in which the motion occurs.

Detecting and storing only a portion in which a motion occurs in the surveillance region image photographed at a shorter period than the predetermined period may include: controlling a photographing speed of the camera faster than before motion detection when motion is detected in the photographed surveillance region image; Extracting only an image of a moving object from images continuously photographed by the camera according to the photographing speed control, and assigning a serial number to each of the extracted images; And storing data, image capturing time information, position coordinate information, color information, and image size information of the image to which the serial number is assigned for each serial number.

In the video surveillance method, if a search condition is not input after a search request for a portion in which a motion occurs, the entire surveillance region image captured at a predetermined period and a partial image in which a motion occurs are synthesized or output only a partial image in which a motion occurs. It may further comprise the step.

As described above, according to the embodiment of the present invention, since only the moving object image is stored when the movement occurs in the surveillance region, the storage space can be saved and economical. By outputting a moving object image reflecting the input search condition after the object image search request, the searcher can quickly search for a desired image without deteriorating concentration.

 In addition, according to an embodiment of the present invention, when a motion occurs in the monitoring area, only the moving object image may be stored and only the motion generating part may be retrieved, thereby reducing the system load.

In addition, according to an embodiment of the present invention, by storing the captured image without deterioration of the image, it is possible to prevent the lack of information of the search image, it is possible to accurately search for the desired target image.

In addition, according to an embodiment of the present invention, it is possible to accurately search for the target image by using image information such as shooting time information, position coordinate information, color information, image size information stored with the partial image.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention; In the following description of the present invention, if it is determined that detailed descriptions of related well-known functions or configurations may obscure the gist of the present invention, the detailed description will be omitted. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to intention or custom of a user or an operator. Therefore, the definition should be based on the contents throughout this specification.

1 is a view showing the configuration of a video surveillance system according to an embodiment of the present invention.

As shown, the video surveillance system according to an embodiment of the present invention includes a plurality of cameras 10 and the monitoring server 20.

The plurality of cameras 10 photograph each surveillance region and transmit the photographed surveillance region to the surveillance server 20, adjust the photographing speed according to the photographing speed control of the surveillance server 20, and photograph the surveillance region. To the monitoring server 20.

Surveillance server 20 detects and stores only a portion in which a motion occurs in the surveillance region image photographed by camera 10, and the entire surveillance region photographed through camera 10 at regular intervals regardless of motion detection in the surveillance region. Save the image. At this time, the entire surveillance area imaged at regular intervals may be used as a background image of the image of the portion where the movement occurs when a search request for the portion where the movement occurs. In addition, the surveillance region photographing period for detecting the occurrence of motion may be shorter than a predetermined period for photographing the surveillance region image.

As described above, since the background image of the moving image is taken and stored at regular intervals, and the moving part is stored only when the movement occurs, the entire surveillance area is continuously taken and stored regardless of the motion detection. In this case, the storage space can be saved more efficiently.

The monitoring server 20 reflects a search condition input after a search request for a portion in which a motion occurs and synthesizes the entire image of the surveillance region and the partial image in which the movement occurs at a predetermined period, or outputs only the partial image in which the movement occurs. do. In this case, the entire surveillance region image synthesized with the partial image in which the movement occurs may be the entire surveillance region image captured at a point closest to the motion detection time point among the entire surveillance region images photographed at regular intervals.

The monitoring server 20 includes a motion detector 23, a monitoring controller 24, an extraction unit 25, a storage device 26, and an output unit 27.

The motion detector 23 detects motion from the surveillance region image captured by the camera. In this case, the motion detector 23 may detect the motion by using an inter-frame difference between the surveillance region image frames. That is, if any difference occurs between the surveillance region image frames, the motion detector 23 may detect the motion according to a result calculated by applying an image subtraction (difference image) formula between the two frames.

The surveillance controller 24 controls the photographing speed of the camera faster than before the motion detection when motion is detected in the surveillance region image captured by the camera. In an embodiment, the monitoring control unit 24 may control the shooting speed of the camera after the motion detection to three frames per second when the camera shooting speed before the motion detection is one frame per second. This corresponds to an embodiment and may be changed according to a use environment.

The extractor 25 extracts only an image of a moving object from images continuously photographed by the camera according to the photographing speed control of the monitoring controller 25, and assigns a serial number to each extracted image. As an example, as shown in FIG. 2, when the movement of the vehicle 31 is detected in the surveillance region image 30 captured by the camera, an image of a region where the movement is detected, that is, a peripheral region including the vehicle 31. Extract to a certain form. At this time, it can be seen that the peripheral area including the moving vehicle 31 is extracted in a rectangular shape.

Thereafter, the extractor 25 assigns a serial number to each extracted image. As an example, as shown in FIG. 2, the serial numbers are assigned to A1, A2, and A3. Further, it can be seen that the size of the image including the vehicle 31 increases and the value in the Y direction increases in the position coordinate information as it moves toward A1-A2-A3. This indicates that the vehicle 31 has moved in the direction of the camera in parallel with the road.

The storage device 26 stores image data, shooting time information, position coordinate information, color information, and image size information for each assigned serial number, and stores the entire image of the surveillance region photographed at regular intervals together with the shooting time information. . For example, as shown in FIG. 2, the position coordinate information (X11, Y11) corresponding to the serial number A1, the extracted image data, the shooting time information, the color information, and the image size information corresponding to the serial number A1 are stored. do. The serial numbers A2 and A3 are also stored in the same manner as the serial numbers A1.

The output unit 27 outputs an image of a moving object by reflecting a search condition input after a search request for a portion in which a motion occurs. In this case, a user interface for receiving a search condition for a portion in which a movement occurs is illustrated in FIG. 3. As shown in FIG. 3, the user interface includes a target field for selecting a movement target, a color field for distinguishing a movement target, a movement direction field for selecting a movement direction of the movement target, and a movement for selecting a movement speed of the movement target. Consists of velocity field, cluster shape field to select cluster shape of moving object, view condition field, search area field, search date field, and search time field to select whether to combine the whole image of moving object and monitoring area. It is. Through such a user interface, a user can select a search condition for a portion where a motion occurs and perform a search.

For example, FIG. 4A illustrates a case in which the user selects to remove the desktop through the view condition field of the user interface, and FIG. 4B illustrates a case where the user selects the screen fill field through the view condition field of the user interface. have. Referring to FIG. 4B, it can be seen that the moving part of FIG. 4A and the entire surveillance area image are synthesized.

On the other hand, if the search condition is not input after the search request for the portion where the movement occurs, the output unit 27 may synthesize the entire image of the surveillance region photographed at a predetermined period and output the partial image generated by the movement, or may output only the partial image generated by the movement. have.

After storing only the portion in which the motion is generated in the storage device 26 without degrading the image quality, it is possible to quickly and accurately search for the desired image by the conditional search when searching for the motion occurrence portion, thereby reducing the system load.

5 is a flowchart of an image surveillance method of an image surveillance system according to an embodiment of the present invention.

As shown, the surveillance server stores the entire surveillance region image taken by the camera at regular intervals (S10). The surveillance server photographs the surveillance region at a period shorter than a predetermined period and checks whether motion is detected in the surveillance region image photographed at the short period (S11).

If the monitoring server detects a motion, the monitoring server stores a part in which the motion occurs in the surveillance region image photographed at short intervals (S12).

Thereafter, the monitoring server checks whether there is a search request for a motion occurrence part (S13). If there is a search request for the motion generating part, the monitoring server checks whether a search condition for the motion generating part is input (S14). In this case, the search condition may be made through the user interface shown in FIG. 3. Therefore, the search conditions include the color to distinguish the moving object, the moving direction of the moving object, the moving speed of the moving object, the cluster shape of the moving object, whether or not to synthesize the entire image of the moving object and the surveillance area, the search area, the search date, It may include at least one of the search time.

If the search condition for the motion generating part is input, the monitoring server reflects the search condition and synthesizes the entire surveillance region image and the motion generating part image photographed at the predetermined period or outputs only the motion generating part image (S15).

On the other hand, if the search condition for the motion generating part is not input, the monitoring server synthesizes the entire surveillance region image and the motion generating part image photographed at the predetermined period or outputs only the motion generating part image (S16). In this case, in steps S15 and S16, the entire surveillance region image synthesized with the partial image in which the movement occurs may be the entire surveillance region image captured at a point closest to the motion detection time point among the entire surveillance region images photographed at a predetermined period.

6 is a flowchart illustrating a method of storing a motion part when detecting a motion according to an embodiment of the present invention. At this time, the moving part storage method shown in Figure 6 is a method performed in step S12 shown in FIG.

As shown, the surveillance server controls the shooting speed of the camera faster than before the motion detection when motion is detected in the surveillance region image to be photographed (S20).

The monitoring server extracts only an image of a moving object from images continuously photographed by the camera according to the shooting speed control, and assigns a serial number to each extracted image (S21). Thereafter, the monitoring server stores the image data, shooting time information and position coordinate information for each serial number in the storage device (S22).

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will understand that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

1 is a block diagram of a video surveillance system according to an embodiment of the present invention.

2 is a view showing a motion detection image according to an embodiment of the present invention.

3 is a view showing a user interface for receiving a search condition according to an embodiment of the present invention.

4A is a screen illustrating only an image of a moving part in which a search condition is reflected according to an exemplary embodiment of the present invention.

Figure 4b is a view showing an image of the image of the moving part and the entire surveillance area in accordance with an embodiment of the present invention.

5 is a flowchart of a video surveillance method of a video surveillance system according to an embodiment of the present invention.

6 is a flowchart illustrating a method of storing a motion part when detecting a motion according to an embodiment of the present invention.

Claims (9)

A plurality of cameras photographing each surveillance area; Wow And a surveillance server that detects and stores only a portion of the surveillance region image photographed by the camera, and stores the entire surveillance region image photographed through the camera at regular intervals separately from the movement detection. The method of claim 1, The monitoring server, And a video surveillance system for outputting a partial image in which a motion is generated by reflecting a search condition input after a search request for the portion in which the motion occurs. The method of claim 2, The monitoring server, A motion detector for detecting motion in the captured surveillance image; A monitoring controller which controls the photographing speed of the camera faster than before motion detection when motion is detected in the captured surveillance region image; An extracting unit extracting only an image of a moving object from images continuously photographed by the camera and assigning a serial number to each of the extracted images according to the photographing speed control of the monitoring controller; Data, shooting time information, and position coordinate information of the image to which the serial number is assigned are stored for each of the serial numbers, and recording time information, position coordinate information, color information, and image size information of the entire surveillance region photographed at each predetermined period. Storage device for storing with; And And an output unit configured to output only a partial image in which a motion is generated by reflecting a search condition input after a search request for the portion in which the motion occurs. The method of claim 3, wherein The output unit, And if a search condition is not input after the search request for the portion in which the movement occurs, the surveillance system synthesizes the entire region and the partial image in which the movement occurs and outputs only the partial image in which the movement occurs. The method according to any one of claims 2 to 4, The search condition is, At least one of the color for distinguishing the moving object, the moving direction of the moving object, the moving speed of the moving object, the cluster shape of the moving object, the combination of the moving object and the whole image of the monitoring area, the search area, the search date, and the search time Video surveillance system comprising one. Storing the entire surveillance region image captured by the camera at a predetermined cycle; Detecting and storing only a portion in which a motion occurs in the surveillance region image photographed at a period shorter than the predetermined period; And And outputting a partial image in which a motion is generated by reflecting a search condition input after a search request for the portion in which the motion has occurred. The method of claim 6, Detecting and storing only a part in which a motion occurs in the surveillance region image photographed at a shorter period than the predetermined period, Controlling the photographing speed of the camera faster than before motion detection when motion is detected in the captured surveillance image; Extracting only an image of a moving object from images continuously photographed by the camera according to the photographing speed control, and assigning a serial number to each of the extracted images; And And storing the data, image capturing time information, position coordinate information, color information, and image size information of the image to which the serial number is assigned for each serial number. The method of claim 5, Video surveillance method of the video surveillance system, If a search condition is not input after the search request for the motion generated part, the method further comprises: synthesizing the entire surveillance region image photographed at a predetermined period with a partial image in which the motion occurs or outputting only a partial image in which the motion occurs; Video surveillance method of video surveillance system. The method of claim 6 or 8, The search condition is, At least one of the color for distinguishing the moving object, the moving direction of the moving object, the moving speed of the moving object, the cluster shape of the moving object, the composition of the moving object and the entire image of the monitoring area, the search area, the search date, and the search time Video surveillance method of a video surveillance system comprising a.

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