KR101361800B1 - Method to control monitoring camera and control apparatus using the same - Google Patents

Abstract

The control method of the surveillance camera according to the present invention includes the steps (a) to (d). In step (a), when a user designated area is generated from the entire screen, a pan value, a tilt value, and a zoom value of the surveillance camera are extracted. In step (b), an offset of the center position to be generated when the surveillance camera performs zooming that enlarges the user specified area to the entire screen according to the zoom value is calculated. In step (c), the pan value and the tilt value are corrected according to the offset of the center position. In step (d), the extracted zoom value, corrected pan value and corrected tilt value are transmitted to the surveillance camera.

Surveillance cameras, zooming, panning, tilting

Description

Control method of surveillance camera and control apparatus using same {Method to control monitoring camera and control apparatus using the same}

The present invention relates to a method and apparatus for controlling a surveillance camera, and more particularly, to panning and tilting according to an input pan value, tilt value, and zoom value. And a method and apparatus for controlling a surveillance camera that performs zooming.

Recently, a surveillance camera performs panning, tilting, and zooming according to a pan, tilt, and zoom value input from a control device, for example, a computer. do. Panning is the rotation of the surveillance camera in the horizontal direction, and tilting is the rotation of the surveillance camera in the vertical direction.

Accordingly, there is a function of area zooming in the surveillance system. The operation of area zooming in the surveillance system is as follows.

For example, when a user-designated area is generated on the screen of the control device by a user's mouse operation, the control device extracts a pan value, a tilt value, and a zoom value and transmits it to the surveillance camera. . In addition, the surveillance camera performs panning and tilting according to the pan value and the tilt value, so that the center position of the user specified area becomes the center of the screen. Next, the surveillance camera zooms in accordance with the zoom value, thereby enlarging the user designated area to the entire screen.

In the function of area zooming of the surveillance system, there is a problem that the center position of the user-specified area does not become the center of the screen because the optical axis is distorted when zooming is performed. Accordingly, the user may feel uncomfortable to enlarge the area designated by the user accurately.

An object of the present invention is to provide a method and apparatus for controlling a surveillance camera that allows a user to enlarge and view an area designated by the user accurately.

The method of the present invention is a control method of a surveillance camera that performs panning, tilting, and zooming according to an input pan value, tilt value, and zoom value. , Steps (a) to (d).

In step (a), when a user designated area is generated from the entire screen, a pan value, a tilt value, and a zoom value of the surveillance camera are extracted. In step (b), an offset of a center position to be generated when the surveillance camera performs zooming that enlarges the user specified area to the entire screen according to the zoom value is calculated. . In step (c), the pan value and the tilt value are corrected according to the offset of the center position. In step (d), the extracted zoom value, corrected pan value and corrected tilt value are transmitted to the surveillance camera.

The apparatus of the present invention is a control device of a surveillance camera that performs panning, tilting and zooming according to an input pan value, tilt value, and zoom value. , The control method is used.

According to the control method and apparatus of the surveillance camera of the present invention, the pan value and the tilt value are changed according to the offset of the center position to be generated when the surveillance camera performs zooming. Is corrected. That is, since the center position is changed before zooming, the misalignment of the center position after zooming may be offset.

Accordingly, when zooming is performed, the problem that the center position of the user-designated area does not become the center of the screen due to the misalignment of the optical axis may be effectively solved. Therefore, the user can enlarge and view the area designated by the user accurately.

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

1 shows that computers 3a, 3b, 3c as control devices in one embodiment of the present invention communicate with surveillance cameras 1a, 1b, 1c via a communication network 2.

Referring to FIG. 1, surveillance cameras 1a, 1b, 1c communicate with computers 3a, 3b, 3c via a communication channel D _COM , and live-view through an image data channel D _IMA . The video data of the view (Live-view) is transmitted to the computers 3a, 3b, 3c.

Here, the user can operate one of the computers 3a or 3b or 3c as a control device to use the function of area zooming. The operation of area zooming according to the present invention will be outlined as follows.

If a user-defined area is created on the screen of the computer 3a or 3b or 3c by a user's mouse operation or the like, the computer 3a or 3b or 3c will display a pan value, a tilt value and a zoom value. Is extracted and transmitted to any of the surveillance cameras 1a, 1b and 1c.

Here, the pan value and the tilt value are corrected according to the offset of the center position to be generated when the surveillance cameras 1a, 1b and 1c perform zooming. Of course, the value of the result of dividing the zoom magnification by the offset (SX, SY) of the center position after zooming is a correction offset before zooming. Accordingly, since the center position is changed before zooming, the misalignment of the center position after zooming may be offset.

Therefore, when zooming is performed, the problem that the center position of the user-designated area does not become the center of the screen due to the misalignment of the optical axis can be effectively solved. Therefore, the user can enlarge and view the area designated by the user accurately. Related contents are described in detail with reference to FIGS. 2 to 10.

FIG. 2 shows that a user designated area 202 is created on the screen 201 of any computer 3a or 3b or 3c of FIG. 1. In FIG. 2, reference numeral DX denotes the horizontal length of the screen 201, and DY denotes the vertical length of the screen 201, respectively.

Referring to FIG. 2, a user may set a desired user-designated area 202 by manipulating a mouse or the like in the computer 3a or 3b or 3c.

3 is panned and tilted by the surveillance cameras 1a, 1b, 1c such that the center position 301 of the user specified areas 202, 302 of FIG. 2 is the center of the screen 201 according to the prior art. Shows the state of tilting. In Fig. 3, the same reference numerals as those in Fig. 2 denote objects having the same function. In FIG. 3, reference numeral UX denotes a horizontal length of the user-specified area, and UY denotes a vertical length of the user-specified area.

2 and 3, in the related art, panning and tilting are simply performed so that the center position 301 of the user designated areas 202 and 302 is the center of the screen 201.

FIG. 4 shows that the center position 401b is skewed in zooming when panning and tilting without correction as shown in FIG. 3 is performed. FIG. 5 illustrates a state in which the center position 501 is not misaligned in zooming as shown in FIG. 4. In Figs. 4 and 5, the same reference numerals as in Figs. 2 and 3 indicate the objects of the same function. In FIG. 4, reference numeral SX denotes a horizontal offset of the center position, and SY denotes a vertical offset of the center position, respectively.

3 to 5, when panning and tilting without correction are performed as shown in FIG. 3, the center position after zooming due to the distortion of the optical axis during zooming ( 401b is distorted at the center position 401a of the user designated area. Accordingly, according to the related art, the user cannot enlarge and view the area designated by the user accurately.

Here, according to the present invention, the pan value according to the offset (SX, SY) of the center position to be generated when the surveillance camera (1a, 1b, 1c of Figure 1) performs zooming (zooming) And tilt values are corrected. Of course, the value of the result of dividing the zoom magnification by the offset (SX, SY) of the center position after zooming is a correction offset before zooming.

Therefore, since the center position is changed before zooming, the misalignment of the center position after zooming may be canceled out. Related contents will be described in detail with reference to FIGS. 6 to 10.

6 illustrates a state in which panning and tilting are performed by the surveillance cameras 1a, 1b, and 1c of FIG. 1 so that the center position 601b of the screen 201 is corrected according to the present invention. In FIG. 6, the same reference numerals as used in FIGS. 2 to 5 indicate the objects of the same function.

Referring to FIG. 6, the center position of the screen 201 after panning and tilting is corrected to a position 601b on the upper right side from the center position 601a of the user designated area. That is, the position on the screen of the user designated area is corrected from the center position 602a to the position 602b on the lower left side.

More specifically, the position 601b shifted by the offset of the center position in zooming from the center position 601a of the user specified area is the center to be generated by panning and tilting. The position is corrected to be. Also, the direction of movement of the center position in panning and tilting is opposite to the direction of movement of the center position in zooming.

FIG. 7 shows that the center position 701b is corrected in zooming when panning and tilting by correction are performed as shown in FIG. 6. In FIG. 7, the same reference numerals as used in FIGS. 2 to 6 indicate the objects of the same function.

Referring to FIGS. 6 and 7, as the center position 601b of the screen 201 is pre-corrected after panning and tilting, the center position after zooming is located on the upper right side of the user specified area. It is restored to the center position 701b at the position 701a.

Here, the offset of the center position in zooming includes the deviation SX in the horizontal direction and the deviation SY in the vertical direction. That is, the pan value is corrected according to the deviation SX in the horizontal direction, and the tilt value is corrected according to the deviation SY in the vertical direction.

Of course, the value (SSX, SSY) of the result of dividing the zoom magnification by the deviation (SX, SY) of the center position after zooming is a correction offset before zooming. That is, Equations 1 and 2 below apply.

In Equations 1 and 2, M is a zoom factor to be applied after panning and tilting. The method for obtaining the deviations SX and SY of the center position after zooming will be described with reference to FIGS. 8 and 9.

FIG. 8 shows a user-defined area (formed by MX and MY) and an arbitrary user-defined area (formed by UX and UY) when the zoom magnification is maximum in the surveillance cameras 1a, 1b, 1c of FIG. Shows. FIG. 9 shows deviations (SMX, SMY) of a center position and deviations (SX, SY) of an arbitrary center position when the zoom magnification is maximum in the surveillance cameras 1a, 1b, and 1c of FIG. 1. . In Figs. 8 and 9, the same reference numerals as in Figs. 2 to 7 indicate the objects of the same function. In FIG. 8, reference numeral MX indicates a horizontal length of a user-designated area corresponding to the maximum zoom magnification. MY refers to the vertical length of the user specified area corresponding to the maximum zoom magnification. In FIG. 9, reference numeral 901 denotes a center position of the screen. 902 indicates a distorted center position corresponding to any zoom magnification. 903 indicates a displaced center position corresponding to the maximum zoom magnification. SMX refers to the horizontal offset of the center position corresponding to the maximum zoom magnification. SMY refers to the vertical offset of the center position corresponding to the maximum zoom magnification.

8 and 9, it can be seen that Equation 3 below is established.

In Equation 3, DX / MX is equal to the maximum zoom factor in the horizontal direction, and DX / UX is equal to any zoom factor in the horizontal direction. Here, the horizontal length DX of the screen, the horizontal length MX of the user specified area corresponding to the maximum zoom factor in the horizontal direction, and the horizontal position of the center position corresponding to the maximum zoom factor in the horizontal direction. Deviations SMX are constants determined according to the characteristics of the surveillance cameras 1a, 1b, 1c. In addition, the horizontal length UX of the user designation region may be known when the user designation region (formed by UX and UY) is generated.

Therefore, the horizontal deviation SX of the center position after zooming can be obtained by Equation 4 below.

Similarly, it can be seen that Equation 5 below is established.

In Equation 5, DY / MY is equal to the maximum zoom factor in the vertical direction, and DX / UX is equal to any zoom factor in the vertical direction. Here, the vertical length (DY) of the screen, the vertical length (MY) of the user-defined area corresponding to the maximum zoom factor in the vertical direction, and the vertical position of the center position corresponding to the maximum zoom factor in the vertical direction. The deviation SMY is constants determined according to the characteristics of the surveillance cameras 1a, 1b, 1c. In addition, the vertical length UY of the user-specified area can be known when the user-specified area (formed by UX and UY) is generated.

Therefore, the vertical deviation SY of the center position after zooming can be calculated by Equation 6 below.

FIG. 10 shows a control algorithm of area zooming according to the present invention used in either computer 3a or 3b or 3c of FIG. 1.

1 to 10, a control algorithm of area zooming according to the present invention used in any one of the computers 3a, 3b, or 3c of FIG. 1 will be described.

If the custom area 202 has been created by the user's operation (step S101), the computer 3a or 3b or 3c causes the center position 301 of the custom area 202 to be the center of the screen 201. A pan value, a tilt value, and a zoom value for extracting the extracted value are extracted, and a zoom value for enlarging the user specified area 202 to the entire screen is extracted (step S102).

Next, the computer 3a or 3b or 3c determines an offset of the center position to be generated when the user-specified area 202 is enlarged to the entire screen 201 by the extracted zoom value. Calculate (step S103). The detailed algorithm related to this is as described with reference to FIGS. 8 and 9 and Equations 3 to 6.

Next, the computer 3a or 3b or 3c corrects the pan value and the tilt value in accordance with the offset of the center position (step S104). The detailed algorithm related to this is as described with reference to FIGS. 6 and 1.

Next, the computer 3a or 3b or 3c is extracted for zooming, tilting and zooming the surveillance camera 1a or 1b or 1c to be controlled. The value, the corrected pan value, and the corrected tilt value are transmitted to the surveillance camera 1a or 1b or 1c (step S105).

All the above steps are repeatedly performed until the end signal is generated (step S106).

As described above, according to the method and apparatus for controlling a surveillance camera according to the present invention, a pan value and tilt according to an offset of a center position to be generated when the surveillance camera performs zooming. The tilt value is corrected. That is, since the center position is changed before zooming, the misalignment of the center position after zooming may be offset.

Accordingly, when zooming is performed, the problem that the center position of the user-designated area does not become the center of the screen due to the misalignment of the optical axis may be effectively solved. Therefore, the user can enlarge and view the area designated by the user accurately.

It can be used in a camera and a control device for performing panning, tilting and zooming.

1 is a diagram showing that computers as control devices in one embodiment of the present invention communicate with surveillance cameras via a communication network.

FIG. 2 illustrates that a user designated area is generated on a screen of any one computer of FIG. 1.

3 is a view showing a state in which panning and tilting are performed by a surveillance camera such that the center position of the user-designated area of FIG. 2 is the center of the screen according to the related art.

FIG. 4 is a diagram showing that a center position is shifted in zooming when panning and tilting without correction are performed as shown in FIG. 3.

FIG. 5 is a diagram illustrating a state where a center position is not shifted in zooming as shown in FIG. 4.

FIG. 6 is a view showing a state where panning and tilting are performed by a surveillance camera so that the center position of the screen is corrected according to the present invention.

FIG. 7 is a diagram showing that the center position is corrected in zooming when panning and tilting by correction are performed as shown in FIG. 6.

FIG. 8 is a diagram illustrating a user designated area and an arbitrary user specified area when the zoom magnification is maximum in the surveillance cameras of FIG. 1.

FIG. 9 is a diagram illustrating a deviation of a center position and an arbitrary center position when the zoom magnification is maximum in the surveillance cameras of FIG. 1.

FIG. 10 is a flowchart showing a control algorithm of area zooming according to the present invention used in any one computer of FIG.

 <Explanation of symbols for the main parts of the drawings>

1a, 1b, 1c ... surveillance cameras, 3a, 3b, 3c ... computers,

201 ...

202,302,602a, 602b ... custom area,

301,401a, 501,601a ... center location of custom area,

The horizontal length of the DX screen, the vertical length of the DY screen,

UX ... the horizontal length of the custom area, UY ... the vertical length of the custom area,

401b, 601b ... center of the screen,

SSX ... horizontal offset of center position to be corrected,

SSY ... vertical offset of the center position to be corrected,

SX ... horizontal offset of center position after zooming,

SY ... vertical offset of center position after zooming,

701a ... the center of the screen before zooming,

701b ... the center of the screen after zooming,

MX ... the horizontal length of the custom area corresponding to the maximum zoom factor,

UX ... Horizontal length of the custom area, corresponding to any zoom magnification,

MY ... the vertical length of the custom area corresponding to the maximum zoom factor,

UY ... the vertical length of the custom area, corresponding to any zoom magnification,

SMX ... horizontal offset of center position corresponding to maximum zoom factor,

SMY ... vertical offset of the center position corresponding to the maximum zoom factor,

901 ... the center of the screen,

902 ... centered position distorted to correspond to any zoom magnification,

903 ... The center position distorted corresponding to the maximum zoom factor.

Claims (7)

A control method of a surveillance camera that performs panning, tilting, and zooming according to an input pan value, tilt value, and zoom value, (a) extracting a pan value, a tilt value, and a zoom value of the surveillance camera when a user designated area is generated from the entire screen; (b) calculating an offset of a center position to be generated when the surveillance camera performs zooming that enlarges the user specified area to the entire screen according to the zoom value; (c) The pan and tilt values are corrected according to the offset of the center position, and the center position to be generated by panning and tilting is the center position of the user specified area. Correcting differently from; And (d) transmitting the extracted zoom value, corrected pan value, and corrected tilt value to the surveillance camera. delete 2. The method of claim 1, wherein in step (c) Control of the surveillance camera that is corrected so that the position shifted by the offset of the center position in the zooming from the center position of the user specified area is the center position to be generated by panning and tilting. Way. Claim 4 has been abandoned due to the setting registration fee. The method of claim 3, wherein in step (c), And a direction of movement of the center position in panning and tilting is opposite to a direction of movement of the center position in the zooming. Claim 5 has been abandoned due to the setting registration fee. 5. The method of claim 4, wherein in step (c) And an offset of the center position in the zooming includes a deviation in a horizontal direction and a deviation in a vertical direction. Claim 6 has been abandoned due to the setting registration fee. The method of claim 5, wherein in step (c), The pan value is corrected according to the deviation in the horizontal direction, And a tilt value is corrected according to the deviation in the vertical direction. A control apparatus of a surveillance camera that performs panning, tilting, and zooming according to an input pan value, tilt value, and zoom value, The control apparatus using the control method in any one of the said Claim 1, The said 3-6.

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