JPH0944759A - Monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the burden on an operator and to improve the quality of monitor by calculating the size and the moving speed of an abnormal object based on a first comparison picture, the moving amount of the picture, and focal length data from a monitor camera and starting an alarm means at the time when they satisfy a set condition. SOLUTION: Video data and focal length data are outputted from a monitor camera 10. A reference picture generation mechanism 23 generates a reference picture as a still picture, and a picture comparison mechanism 24 compares the reference picture with the present picture to extract different parts. A picture comparison mechanism 26 compares the monitor picture delayed by a picture delay mechanism 25 with the reference picture to extract different parts. Outputs of picture comparison mechanisms 24 and 26 are inputted to a picture comparison mechanism 27 to detect movement on a screen of the abnormal object which doesn't appear in the reference picture. A logical mechanism 28 calculates the actual area in accordance with the output of the picture comparison mechanism 24 and focal length data and calculates the moving speed of the object in accordance with the output of the picture comparison mechanism 27 to synthetically judge whether an alarm should be given or not.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to reducing the burden on an operator who monitors an intruding object or the like in a monitoring center such as a building.

[0002]

2. Description of the Related Art Generally, as a monitoring work in a conventional monitoring center, a plurality of monitoring displays are visually recognized or the display is switched by a device operation to perform monitoring.

[0003]

However, in the conventional monitoring method, the operator has to keep the display visible, and most of the monitoring time is "abnormal".
Therefore, it is considered that maintaining a sense of urgency for continuous monitoring work is unbearable from the viewpoint of human characteristics, and finally, it becomes a concern that the reliability of the monitoring system deteriorates.

[0004]

SUMMARY OF THE INVENTION According to the present invention, there is provided a surveillance camera for picking up a surveillance area and outputting video data, and a video for a static portion by accumulating video data at a constant time and removing a changed portion. With the reference image creating means for outputting as a reference image, the current image data output from the surveillance camera and the reference image are compared, and only the different portion is extracted and the
Of the first image comparing means for outputting as the comparison image of the second image and the image data outputted from the surveillance camera for a predetermined time before and the reference image are compared, and only the different portions are extracted and output as the second comparison image. From the second video comparing means, the third video comparing means for comparing the first comparison image and the second comparison image to calculate the movement amount of the image, the first comparison image and the movement amount of the image, and the monitoring camera. And a logic means for activating the warning means when the size and the moving speed of the abnormal object are calculated based on the output focal length data and when they satisfy a predetermined condition.

An image of the stationary object is obtained by the reference image creating means, an image of the abnormal object at the present time is obtained by the first image comparing means, and an image of the abnormal object at a point slightly before is obtained by the second image comparing means. An image is obtained, and the amount of movement of the image relating to the abnormal object is obtained by the third video comparison means.
The logic means estimates the size and moving speed of the abnormal object based on these information and the focal length data output from the surveillance camera, and when they satisfy a predetermined condition, activates the alarm means, Notify the operator.

[0006]

1 is a block diagram showing an embodiment of the present invention.

First, there is a surveillance camera 10 installed for a surveillance object, from which video data is output. At the same time, the image is clearly displayed by the automatic focusing mechanism, and the distance measurement data (focal length data) based on the focal length is output. Each output data is input to the monitoring support device 20. The video data is sent by the video distributor 21 to the noise removing mechanism 2
2 and monitoring display 31. The monitor display 31 merely displays 10 images.

The reference image forming mechanism 23 accumulates images for a predetermined time ts, removes a changed portion, and forms a reference image K as a still image in a normal state. The image comparison mechanism 24 compares the reference image K with the image at the present time t displayed by the monitoring camera 10 and extracts only the different portion. On the other hand, the video comparison mechanism 26 compares the monitor image, that is, the delayed image slightly before the time td delayed by the video delay mechanism 25, with the reference image K, and extracts only the different portion.

The comparison images H1 and H2, which are the outputs of both the image comparison mechanisms 24 and 26, are input to the image comparison mechanism 27, and the image comparison mechanism 27 moves the abnormal object which does not appear in the reference image K on the screen. , And is detected based on both comparison images H1 and H2.

Finally, the logic mechanism 28 is the image comparison mechanism 24.
From the output H1 and the focal length data, the actual area of the actual object as a plane facing the surveillance camera 10 is calculated, and from the output H3 of the image comparison mechanism 27, the moving speed of the object is calculated, and comprehensively. By determining whether the alarm is worthy and activating the alarm 32, the operator is given a necessary alarm.

Next, the operation of the monitoring apparatus of FIG. 1 will be described with reference to the operation explanatory diagram of FIG. First, the reference image K is created from the video of the surveillance camera 10. This is a process that is normally performed for the purpose of removing a stationary object later, and is used as a reference image K when comparing images that are constantly displayed from images accumulated at constant time ts. That is,
It recognizes stationary objects such as buildings.

Next, the actual image at the present time t is compared with the reference image K, and the difference is extracted to obtain the comparison image H1.
Next, a comparative image H2 is obtained by a similar method from the video obtained by delaying the video of the surveillance camera 10 by td and the reference image K. The comparative image H1 displays a plane of an abnormal object that does not normally appear with respect to the monitoring camera 10 as a plane, and the difference between the comparative images H1 and H2 can be further extracted to obtain the movement of the abnormal object as an image. .

Further, the actual size of the object is calculated from the comparative image H1 based on the focal length data output from the surveillance camera 10. Further, the actual moving speed of the object is calculated from the comparative image H3. Based on these calculation results, it is determined whether the object gives an alarm. For example,
From the size and moving speed of the object, it is determined that the object is a small animal or the like.

In calculating the actual size of the abnormal object, the relationship between the display area and the actual size in the place where the image is displayed is grasped in advance. Further, in calculating the moving speed, the speed is converted by the difference between the X-axis and Y-axis positions such as the center of gravity of the image in the display image.

[0015]

In a normal surveillance center or the like, it is necessary to constantly monitor all the images of a plurality of surveillance cameras at the same time.

It is difficult for the operator to maintain a feeling of tension because it is necessary for the operator to monitor an image in which almost no abnormality occurs for a long time, and it is difficult because of human characteristics. It raises doubts.

The present invention is a monitoring support system which issues an alarm to an operator to make a judgment only when an abnormality occurs, which reduces the load on the operator and improves the quality of monitoring. Further, the present invention is used as a monitoring support system for monitoring work around a building or the like, or in a restricted area.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a monitoring device.

FIG. 2 is an operation explanatory diagram of FIG. 1;

[Explanation of symbols]

 10 Surveillance Camera 20 Surveillance Support Device 21 Video Distributor 22 Noise Elimination Mechanism 23 Reference Video Creation Mechanism 24 Video Comparison Mechanism 25 Video Delay Mechanism 26 Video Comparison Mechanism 27 Video Comparison Mechanism 28 Logical Mechanism 31 Surveillance Display 32 Alarm

Claims (1)

[Claims] 1. A surveillance camera for imaging a surveillance area and outputting video data, and a reference for accumulating video data at a constant time interval, removing a changed portion, and outputting a still image as a reference image. Video creating means, first video comparing means for comparing the current video data output from the surveillance camera with the reference image, extracting only different portions, and outputting this as a first comparison image, Second video comparison means for comparing the video data output from the monitoring camera for a certain period of time with the reference image, extracting only different portions, and outputting this as a second comparison image; Comparing the second comparison image with the comparison image of
The size and movement of the abnormal object based on the third video comparison means for calculating the movement amount of the image, the first comparison image and the movement amount of the image, and the focal length data output from the surveillance camera. And a logic unit that activates an alarm unit when a speed is calculated and the size of the abnormal object and the moving speed satisfy predetermined conditions.