KR100744870B1 - Apparatus and method for controling pan and tilt for monitoring camera - Google Patents

Abstract

The present invention relates to a pan and tilt control device and method of a surveillance camera, for example, in a pan / tilter with a maximum pan angle of less than 360 degrees, the pan and tilt for the surveillance camera. When the fan boundary value is reached during the control operation, the fan angle is out of the pan boundary value by performing a tilt tilt operation at a predetermined angle and panning a predetermined angle in the opposite direction to enable a 360 degree panning operation. Also, since it is possible to perform the panning operation normally, it is a very useful invention that does not need to use a high-cost pan / tilter capable of 360-degree panning.

Surveillance Camera, Pan / Tilt, Maximum Pan Angle, Pan Threshold, 360 Degrees Panning

Description

Pan and tilt control device and method for surveillance camera {Apparatus and method for controling pan and tilt for monitoring camera}

1 illustrates a state in which a pan / tilt equipped with a general surveillance camera and a digital video recorder are connected and connected.

2 illustrates an embodiment of a pan and tilt control process of a general surveillance camera,

Figure 3 shows the configuration of the pan and tilt control device of the surveillance camera according to the present invention,

4 is a flowchart illustrating an operation of a pan and tilt control method of a surveillance camera according to the present invention.

Figure 5 shows an embodiment of the pan and tilt control process of the surveillance camera according to the present invention.

※ Explanation of code for main part of drawing

100: PTZ camera 200: Pan / Tilt

300: digital video recorder 20: fan motor

21: tilt motor 22: pan / tilt drive

23: microcomputer 24: fan angle detection unit

25: tilt angle detection unit 26: interface unit

The present invention relates to a pan and tilt control device and method of a surveillance camera, for example in a pan / tilter with a maximum pan angle of less than 360 degrees, panning 360 degrees for the surveillance camera. A pan and tilt control apparatus and method for a surveillance camera for enabling operation.

Generally, a PTZ surveillance camera equipped with a pan / tilt / zoom function is mounted on a pan & tilter fixedly installed on a ceiling of a specific place, for example, as shown in FIG. 1. The PTZ monitoring camera 100 may move the surveillance area to another direction by a panning operation rotated in the horizontal direction by the pan / tilt 200 and a tilting operation rotated in the vertical direction. Can be changed.

In addition, in the PTZ surveillance camera, the zoom lens may be variably adjusted in a tele or wide direction to enlarge or photograph a subject, and to capture the captured video image. As shown in FIG. 1, the digital video recorder 300 is located at a remote place.

The digital video recorder 300 outputs and displays the video image photographed by the PTZ surveillance camera through a monitor screen and records and stores the recording on a hard disk (HDD) included in the device. For example, an administrator who monitors a corresponding area through the monitor screen may arbitrarily remotely control a pan / tilt angle of the pan / tilt 200 by using a joystick or the like. .

On the other hand, recently, a pan / tilter having a maximum pan angle of less than 360 degrees has been developed and commercialized in a low-cost, low-priced type, and commercialized. As shown in FIG. 2, for example, the maximum pan angle of the pan / tilter is In the case of 0 to 340 degrees, even if the manager continues to request a panning operation in the counterclockwise direction, the pan / tilter performs the panning operation only up to +340 degrees, which is the right pan threshold, and thus, for the remaining 340 to 360 degrees. Since it is impossible to perform the panning operation, there is a problem that reduces the surveillance performance of the surveillance camera.

Accordingly, the present invention was created to solve the above problems, for example, in a pan / tilter having a maximum pan angle of less than 360 degrees, a pan and tilt control operation for a surveillance camera. When the pan boundary is reached, pan and tilt control of the surveillance camera is performed to perform a predetermined angle tilting operation and to perform a predetermined angle panning operation in the opposite direction to enable a 360 degree panning operation. It is an object of the present invention to provide an apparatus and method.

Pan and tilt control method of the surveillance camera according to the present invention for achieving the above object, In the pan and tilt control method of the surveillance camera, Panning the surveillance camera; Detecting whether a threshold value of a fan angle is reached during the panning operation; And when the boundary value of the pan angle is reached, performing a predetermined angle tilting operation and performing a predetermined angle panning operation in an opposite direction.

In addition, the pan and tilt control apparatus of the surveillance camera according to the present invention, the pan and tilt control apparatus of the surveillance camera, the driving means for panning and tilting the surveillance camera; Detection means for detecting whether a threshold value of a fan angle is reached during the panning operation; And control means for controlling the driving means to perform a predetermined angle tilting operation and to perform a predetermined angle panning operation in the opposite direction when the threshold value of the fan angle is reached. .

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the pan and tilt control apparatus and method of the surveillance camera according to the present invention will be described in detail.

First, the pan and tilt control apparatus of the surveillance camera according to the present invention, as described above, can be applied to the pan / tilter 200 having a maximum pan angle of less than 360 degrees, as shown in FIG. The pan / tilt 200 includes a fan motor 20, a tilt motor 21, a pan / tilt driver 22, a microcomputer 23, a pan angle detector 24, a tilt angle detector 25, and an interface unit. 26 can be configured to include,

On the other hand, the pan motor 20 and the tilt motor 21 are rotated by the pan / tilt drive unit 22 controlled by the microcomputer 23 to pan the monitoring camera 100, or The pan angle detection unit 24 and the tilt angle detection unit 25 detect the pan angle and the tilt angle of the monitoring camera and output the same to the microcomputer 23.

In addition, the microcomputer 23 confirms the pan angle and tilt angle detected as described above. For example, the fan angle detected by the detected fan angle detector 24 is previously limited. If the angle boundary value, the operation of the pan / tilt drive unit 22, the tilt operation of a certain angle is performed, and the panning operation of a predetermined angle in the opposite direction, it is possible to 360-degree panning operation It will be described in detail as follows.

4 is a flowchart illustrating an operation method of a pan and tilt control method of a surveillance camera according to the present invention. For example, an administrator who monitors a corresponding region through a monitor screen may use the pan / tilt to control the pan / tilt. When the pan angle of the tilter 200 is arbitrarily remotely controlled, the microcomputer 23 operates the pan / tilt driver 22 to perform a corresponding panning operation (S10). ).

On the other hand, in the microcomputer 23, for example, as shown in FIG. 5, while performing the panning operation in the counterclockwise direction in the state where the maximum fan angle is 0 to 340 degrees (S11), the left boundary value is reached. (S12), i.e., when reaching the maximum left pan angle of 340 degrees and no longer panning operation, the operation of the pan / tilt driving unit 22 is controlled to subtract the current tilt angle x 2 from 180 degrees. In addition, the tilting operation is performed by one degree, and the panning operation is performed by 180 degrees in the clockwise direction opposite to the tilting operation, thereby performing the tilting / panning operation so as to be inverted up, down, left, and right with the current screen (S13).

For example, in the case of FIG. 5, since the current tilt angle is 0 degrees, the tilt operation is performed by 180 degrees which is an angle obtained by subtracting 0 degrees x 2 from 180 degrees, and also 180 degrees clockwise in the opposite direction. By panning so that the surveillance camera is positioned at the previous boundary value, the surveillance camera 100 is turned upside down by the tilting operation, and the pan boundary value of the pan / tilter 200 is also shown in FIG. 5. As shown in FIG. 6, since the fan angle 180 degrees away from the previous boundary value becomes the new boundary value, the panning operation can be continued by 180 degrees in the previous counterclockwise direction (S14).

On the other hand, in the monitoring camera 100, while performing the tilt operation and the pan operation automatically due to the arrival of the pan threshold as described above, in accordance with the control signal output from the microcomputer 23, the captured image is output The image captured at the time of reaching the pan threshold is continuously output as a still image.

In addition, if the tilt operation and the pan operation are completed, and the panning operation is continued in the previous counterclockwise direction, the image is outputted inverted up, down, left, and right from that point of time, and thus the manager may perform a 360 degree panning operation in the counterclockwise direction. It is possible to continue to perform, even if the surveillance camera is turned over by the tilt operation, it is possible to see the up, down, left and right reversed image normally.

On the other hand, in the microcomputer 23, when the right boundary value (for example, 0 degrees) is reached while performing a panning operation that is not counterclockwise, that is, a clockwise rotation (S15), the pan / tilt By operating the driving unit 22, the tilt operation is performed by subtracting the current tilt angle x 2 times from 180 degrees, and the panning operation is performed by 180 degrees in the counterclockwise direction as opposed to the clockwise direction. (S16).

Then, the panning operation is continued by 180 degrees in the previous clockwise direction (S14). At this time, in the monitoring camera 100, as described above, the tilting operation and the pan operation are automatically performed due to the arrival of the pan boundary value. During the operation, the captured image is not output or corresponding to the control signal output from the microcomputer 23, or the image captured at the time of reaching the pan threshold is continuously output as a still image.

In addition, when the tilt operation and the pan operation are completed, and the panning operation is continued in the previous clockwise direction, the image is inverted up, down, left, and right from that point on, and thus the manager continues the 360 degree panning operation in the clockwise direction. Even if the surveillance camera is turned over by the tilting operation, the inverted image can be normally viewed.

As mentioned above, preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and those skilled in the art can improve other various embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. Changes, substitutions or additions will be possible.

The pan and tilt control device and method of the surveillance camera according to the present invention constructed and constructed as described above, for example, in a pan / tilter with a maximum pan angle of less than 360 degrees, During the pan and tilt control operation, when the pan boundary value is reached, the pan boundary is performed by performing an angle tilt operation as well as performing an angle panning operation in the opposite direction to enable a 360 degree panning operation. Since the pan angle can be normally performed even when the fan angle is out of range, it is a very useful invention that does not require the use of an expensive pan / tilt capable of 360 degree panning.

Claims (13)

In the pan and tilt control method of the surveillance camera, Panning the surveillance camera; Detecting whether a threshold value of a fan angle is reached during the panning operation; And And a panning / tilting control method of the surveillance camera, wherein the tilting / panning operation is performed when the pan angle is reached. The method of claim 1, In the third step, when the boundary value of the pan angle is reached, the tilt operation is performed by the angle obtained by subtracting the current tilt angle x 2 times from 180 degrees, and the 180 degree panning operation is performed in the opposite direction. Pan and tilt control method of surveillance camera. The method of claim 1, And after the tilting and panning operation, further performing a panning operation in a previous panning direction. The method of claim 3, wherein After the tilt and pan operation, the pan and tilt control method of the surveillance camera, characterized in that to perform a panning operation by 180 degrees from the detected previous pan angle boundary value. The method of claim 1, The pan and tilt control method of the surveillance camera, characterized in that during the three-step tilt and pan operation, the surveillance camera pauses the shooting operation or continues to output the same still image. The method of claim 1, The panning and tilting control method of the monitoring camera, characterized in that when the three-step tilt and panning operation is completed, the monitoring camera reverses the captured image up, down, left, and right. The method of claim 1, In the step 3, if the boundary value of the pan angle reached is panned to the left, the pan and tilt control of the surveillance camera, characterized in that panning 180 degrees in the right direction, if the right threshold is 180 degrees in the left direction. Way. In the pan and tilt control device of the surveillance camera, Driving means for panning and tilting the surveillance camera; Detection means for detecting whether a threshold value of a fan angle is reached during the panning operation; And And a control means for controlling the driving means to perform a tilt / panning operation so as to be inverted up, down, left, and right with the current screen when the threshold value of the pan angle is reached. And tilt control. The method of claim 8, When the control means reaches the boundary value of the fan angle, the control unit performs a tilt operation by an angle obtained by subtracting a current tilt angle x 2 times from 180 degrees, and performs a 180 degree panning operation in the opposite direction. Pan and tilt control device of the surveillance camera, characterized in that for controlling the drive means. The method of claim 8, The control means, the pan and tilt control apparatus of the surveillance camera, characterized in that for controlling the driving means to continue to perform the panning operation in the previous panning direction after the tilt and panning operation. The method of claim 8, The pan and tilt control apparatus of the surveillance camera, characterized in that during the tilt and pan operation, the surveillance camera temporarily stops shooting operation or continuously outputs the same still image. The method of claim 8, When the tilt and panning operation is completed, the pan and tilt control device of the monitoring camera, characterized in that the monitoring camera, the image inverted up, down, left and right. The method of claim 8, The control means controls the driving means to pan 180 degrees in the right direction when the boundary value of the reached fan angle is the left boundary value, and pan 180 degrees in the left direction when the boundary value of the fan angle is left. Pan and tilt controls for surveillance cameras.

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