KR20030041286A - Method for matter moving detection of monitoring camera - Google Patents

Abstract

PURPOSE: A method for detecting the movement of an object in a monitoring camera is provided to accurately detect the movement of an actual object while the monitoring camera performs pan, tilt, and zoom operations. CONSTITUTION: A microcomputer decides on the movement angle of a predetermined camera related to the movement distance of a picture in pan and tilt operations(S21). The microcomputer predicts and stores a picture and data after the movement of the picture(S22). The predicted area stored at a memory part is compared with a result obtained by moving a zoom lens of the camera as much as the movement distance(S23-S24). If the difference is larger than thresholds of a color temperature and a luminosity of a preliminarily set object, it is judged that the object is moving and it is reported that the movement of the object is detected(S25-S26). It is asked whether pan, tilt, and zoom operations of the camera are stopped and the movement is detected(S27-S28).

Description

How to detect the movement of objects of surveillance cameras {METHOD FOR MATTER MOVING DETECTION OF MONITORING CAMERA}

The present invention relates to a method of detecting a motion of an object of a surveillance camera, and more particularly, to a method of detecting a motion of an object of a surveillance camera so that the motion of an actual object can be accurately detected even while the camera is periodically and continuously moved.

In general, the surveillance camera can detect movement only when the lens is fixed.

That is, when the pan, tilt and zoom operations of the surveillance camera move, the surveillance camera moves so that the movement is detected by the above operation even when the object does not move. There is no detection of the movement of the real thing.

For example, as shown in FIG. 1, when the surveillance camera that monitors the object by the entire surveillance range M monitors the object, the surveillance camera is monitored by moving the pan in the screen A being monitored. It moves to the state of the screen B being used.

However, the prior art operating as described above has a problem in that the movement of an actual object cannot be accurately detected where the operation of the pan and tilt is performed periodically or continuously.

Accordingly, the present invention has been made to solve the above problems, and the object of the surveillance camera can accurately detect the movement of the real object even while the pan, tilt and zoom of the surveillance camera are periodically and continuously operated. Its purpose is to provide a motion detection method.

1 is an exemplary view showing a monitoring screen according to the movement of a general surveillance camera.

2 is a flowchart illustrating a method of detecting a motion of an object of the surveillance camera of the present invention.

3 is an exemplary view showing the configuration of an apparatus to which a method for detecting a movement of an object of the surveillance camera of the present invention is applied.

Figure 4 is an exemplary view showing a comparison area of the screen according to the movement of the pan of the surveillance camera of the present invention.

*** Explanation of symbols for main parts of drawing ***

31: zoom lens 32: drive motor unit

32a: Zoom drive motor 32b: Focus drive motor

32c: fan drive motor 32d: tilt drive motor

33: video signal processor 34: microcomputer

35: memory

According to an aspect of the present invention, there is provided a surveillance camera for monitoring a movement of an object, comprising: a first process of determining a movement of an object by moving a predetermined interval with a pan, a tilt, a zoom, and the like; When the movement of the object is determined, a second process of detecting the movement of the object may be performed.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a flowchart illustrating a method for detecting a motion of an object of the surveillance camera according to the present invention. In the surveillance camera for monitoring the movement of an object, the movement of the object is determined by moving a predetermined interval with a pan, tilt, and zoom. A first process (S25) to perform; When the movement of the object is determined, a second process (S28) of detecting the movement of the object is performed. The operation and operation of the present invention configured as described will be described below.

First, FIG. 3 is an exemplary view showing the configuration of a device to which the method for detecting the movement of an object of the surveillance camera according to the present invention is applied. As shown in FIG. 3, the image captured by the zoom lens 31 of the surveillance camera is controlled according to a control signal. A drive motor unit 32 for driving the lens to capture the image; An image signal processor (33) for measuring the brightness of the subject with respect to the sensor signal captured by the zoom lens (31) and adjusting the white balance according to a change in the color temperature of the light source to output the image signal; A microcomputer (34) for comparing the currently captured image of the image signal processor (33) with previously stored images and outputting the control signal to the drive motor (32); The memory unit 35 temporarily stores all images of the current image and outputs them to the microcomputer 34.

The driving motor unit 32 includes a zoom driving motor 32a for driving a zoom by receiving control signals of a microcomputer; A focus drive motor 32b driven to focus the zoom lens; A fan drive motor 32c for driving the movement of the fan; It consists of the tilt drive motor 32d which drives a tilt.

The microcomputer 34 determines an angle of movement of the predetermined camera to determine how much the surveillance camera of the present invention moves the screen during pan and tilt operations.

By the above process, the screen and data after moving by the moving distance (X STEP) are estimated and stored. (S22)

At this time, the screen comparison is performed only for the common screen area before and after the pan and tilt operation, but not for the newly displayed screen and the missing screen area.

Figure 4 is an exemplary view showing a comparison area of the screen according to the movement of the pan of the surveillance camera of the present invention, as shown in (a) is a screen when the time is T, (b) thereafter the When the viewing angle is moved from left to right for a time equal to T + ㅿ t, the screen captured by the zoom lens 31 of the camera is shown.

(A) and (b) have a common area which is an expected area stored in the memory unit 35 as an image obtained by changing the movement of the surveillance camera for a very short time.

As a result, the result obtained by moving the expected area stored in the memory unit 35 as much as the predetermined moving distance X STEP and the actual zoom lens 31 of the surveillance camera by the moving distance X STEP is obtained. The difference value is output, and when the difference value is larger than the preset threshold values of the color temperature and the intensity of the object, it is determined that the object is in motion and the motion of the object is detected. ~ S26)

At this time, the camera stops panning, tilting and zooming the moving camera and asks whether to detect the movement (S27, S28).

In detecting the movement of the object by repeating the above-described operation process, the new screen area during the? T time is then compared with the above process after the? T (T + ㅿ 2t). Detect.

Therefore, the method of detecting the movement of an object through the surveillance camera of the present invention compares the movement of the object with the expected screen and the current screen captured by the lens of the surveillance camera, and compares the difference value with the threshold value accordingly. Is detected by movement.

As described in detail above, the present invention compares the data pre-stored in the memory unit of the surveillance camera with the common area of the image of the current object, and detects the difference value as the movement of the object to periodically and continuously monitor the pan, Even while the tilt and zoom operations are performed, the motion of the real object can be accurately detected.

Claims (3)

A surveillance camera for monitoring the movement of an object, comprising: a first process of determining a movement of an object by moving a predetermined interval with a pan, tilt, zoom, etc .; And a second process of detecting a movement of the object when the movement of the object is determined. The method of claim 1, wherein the first process limits the difference value obtained by comparing the expected data with the current data when the surveillance camera stores the predicted data according to the movement of the predetermined interval, and the surveillance camera moves the the predetermined interval. And detecting a motion of the object of the surveillance camera. The method of claim 1, wherein the second process includes notifying that the movement of the surveillance camera is detected, and determining whether to detect the movement by stopping pan, tilt, zoom, and the like. Motion detection method.