KR102074892B1 - PTZ detailed control server and method using viewing angle of CCTV camera - Google Patents

Abstract

Disclosed are a server for precisely controlling pan-tilt-zoom (PTZ) using a view angle of a CCTV camera which is capable of precisely controlling PTZ of an existing CCTV camera regardless of a model and a method thereof. According to one embodiment of the present invention, a precise PTZ control method using a view angle of a CCTV camera comprises the steps of: defining a virtual optical sensor based on a charge-coupled device (CCD); calculating a distance between the defined virtual optical sensor and a lens; calculating a horizontal view angle of the lens in a current zoom state; calculating a virtual distance between the lens and a monitor screen in accordance with the size of the monitor screen; converting coordinate values inputted from the monitor screen into a coordinate value of a CCD screen; calculating a difference value between the converted coordinate value of the CCD screen and the central part of the monitor screen; determining a final pan value based on a calculation result; and determining a final tilt value based on the calculation result.

Description

PTZ precise control server and method using viewing angle of CCTV camera

The present invention relates to a PTZ precision control server and method using a viewing angle of a CCTV camera, and more particularly, to a PTZ precision control server and method using a viewing angle of a CCTV camera for controlling PTZ with a minimum of information.

CCTV (Closed-Circuit Television) surveillance system is a video information technology that judges the abnormality of surveillance zone through video information in criminal investigation field, security field, traffic accident processing field, and automatic object tracking system field. It has been installed in dangerous places and used for the purpose of preventing crime, but recently it has been installed and used in various places such as companies or homes that need security management.

In the early days of CCTV, fixed cameras that can only be photographed at fixed locations were used, but now mobile cameras using PTZ (Pan-Tilt-Zoom) are mainly used.

PTZ camera is a camera that the user can freely adjust the camera lens direction after installing the camera, and it can function as Pan (left and right), Tilt (up and down), Zoom (image zoom in and out). In other words, the PTZ camera may not monitor a fixed direction like a fixed camera, but may monitor several places other than a designated direction.

In these PTZ cameras, precise control is performed through a camera control program such as ActiveX. However, the control method is different depending on the type of camera, there is a difficulty in that the precise control is not practical due to the characteristics of the manufacturer.

When a PTZ camera is applied to a CCTV, very precise control is required, for example, to grasp valid information from a crime scene photographed image. However, since most PTZ camera manufacturers do not disclose key elements for camera control for security reasons, there is a problem that precise control is not possible using only information provided by the camera manufacturer.

Registered Korean Patent No. 10-1704427 (registered Feb. 2, 2017)

Technical problem to be solved by the present invention to solve the above problems, PTZ precision control server and method using the viewing angle of the CCTV camera that can precisely control the PTZ of the ready-made CCTV camera regardless of the model using only limited information To present.

The problems of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

As a means for solving the above technical problem, PTZ precision control method using a viewing angle of a CCTV camera according to an embodiment of the present invention, the step of defining a virtual optical sensor based on a CCD (Charged Coupled Device), Calculating a distance between the virtual optical sensor and the lens, calculating a horizontal viewing angle of the lens in the current zoom state, calculating a virtual distance between the lens and the monitor screen according to the size of the monitor screen, and coordinates input from the monitor screen. Converting a value into a coordinate value of the CCD screen, calculating a difference value between the coordinate value of the converted CCD screen and the center of the monitor screen, determining a final pan value using the calculation result, And determining a final tilt value by using the calculation result.

Preferably, the defining step may calculate the horizontal length of the virtual optical sensor by the following formula:

Here, CW is the horizontal length of the virtual optical sensor, VA is the initial viewing angle, FL is the initial distance of the virtual optical sensor and the lens.

Also preferably, in the calculating of the distance between the defined virtual optical sensor and the lens, the distance between the virtual optical sensor and the lens may be calculated by the following equation.

Where Z is the zoom value of the current lens and FL 'is the distance between the virtual optical sensor and the lens.

Also preferably, in the calculating of the horizontal viewing angle, the horizontal viewing angle may be calculated by the following equation:

Where VA 'is the transverse reagent angle.

Also preferably, calculating the virtual distance between the lens and the monitor screen may calculate the virtual distance by the following formula:

Where IF is the imaginary distance.

Also preferably, the step of converting the coordinate values of the CCD screen may convert the coordinate values of the CCD screen into the calculated coordinate values by calculating the coordinate values by the following formula:

Here, X 'and Y' are coordinate values of the converted CCD screen, X and Y are input coordinate values, WF is the horizontal size of the CCD screen, WF 'is the horizontal size of the monitor screen, and HF is the CCD screen. HF 'is the vertical size of the monitor screen.

Also preferably, the step of calculating the difference between the coordinates of the converted CCD screen and the center of the screen may be calculated by the following formula:

Where X '' and Y '' are the difference value coordinates.

Also, the determining of the final pan value may include generating a reference line by connecting the center of the lens and the center point of the monitor screen in a straight line, moving the center of the lens by the Y coordinate of the difference value from the center point. Generating a first line by connecting the first point, determining an angle between the reference line and the first line, calculating a length of the first line, center of the lens, and X of the difference value at the first point. Connecting a second point moved by coordinates to generate a second line, determining an angle between the first line and the second line, and calculating a final pan value by the current pan value and the changed pan value. can do.

Also preferably, in determining the angle formed by the reference line and the first line, the angle may be calculated by the following formula:

Here, CT is an angle between the reference line and the first line, and NT is the current tilt value.

Also preferably, calculating the length of the first line may calculate the length by the following formula:

Where DY is the length of the first line.

Also preferably, in determining the angle formed by the first line and the second line, the angle may be calculated by the following formula:

Here, P 'is an angle formed by the first line and the second line.

Also preferably, the step of calculating the final fan value may be calculated by the following formula:

Where P is the final fan value and NP is the current fan value.

Also preferably, the determining of the final tilt value may include: a third line connected to be perpendicular to the virtual distance from the center of the lens, and a point of view of the center of the lens when the tilt value of the lens is changed. Forming a triangular surface having two sides of the fourth line connecting the third point, determining the length of the third line constituting the triangular surface, and centering the lens at both ends of the virtual distance. The method may include determining a length of a fifth line connecting one end that is not in contact with the third point, and calculating a final tilt value by reflecting the determined lengths of the fourth and fifth lines.

Also preferably, in determining the length of the third line, the length of the third line may be determined by the following formula:

Where VF is the length of the third line.

Also preferably, in determining the length of the fifth line, the length of the fifth line may be calculated by the following formula:

Here, PF is the length of the fourth line.

Also preferably, in calculating the final tilt value, the final tilt value may be calculated by the following formula:

Where T is the final tilt value.

Meanwhile, the PTZ precision control server using the viewing angle of a CCTV camera according to another embodiment of the present invention defines a virtual optical sensor based on a charged coupled device (CCD) and calculates a distance between the defined virtual optical sensor and the lens. Calculates the lateral viewing angle of the lens in the current zoom state, calculates a virtual distance between the lens and the monitor screen according to the size of the monitor screen, converts the coordinate value input from the monitor screen into the coordinate value of the CCD screen, The difference between the coordinates of the converted CCD screen and the center of the monitor screen is calculated, the final pan value is determined using the calculation result, and the final tilt value is determined using the calculation result. And a communication unit for transmitting the determined final pan value and final tilt value to the camera.

According to the present invention, the PTZ precision control server using the viewing angle of the CCTV camera that can control the PTZ of the CCTV camera very precisely, using only the minimum information provided by the ready-made CCTV camera manufacturer and the information obtained from the camera sensor; It has the effect of providing a method.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a network configuration diagram of a PTZ precision control system using a viewing angle of a CCTV camera according to an embodiment of the present invention,
2 is a block diagram of a PTZ precision control server using a viewing angle of a CCTV camera according to an embodiment of the present invention,
3 to 12 are views for explaining a formula formulation process for the PTZ precise control using the viewing angle of the CCTV camera according to an embodiment of the present invention, and,
13 is a flowchart illustrating a method for precisely controlling PTZ using a viewing angle of a CCTV camera according to an exemplary embodiment of the present invention.

Objects, other objects, features and advantages of the present invention will be readily understood through the following preferred embodiments associated with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed contents can be thorough and complete, and to fully convey the spirit of the present invention to those skilled in the art.

In the present specification, when a component is mentioned as being on another component, it means that it may be formed directly on the other component or a third component may be interposed therebetween. In addition, in the drawings, the thickness of the components are exaggerated for the effective description of the technical content.

Where the terms first, second, etc. are used herein to describe the components, these components should not be limited by these terms. These terms are only used to distinguish one component from another. The embodiments described and illustrated herein also include complementary embodiments thereof.

In addition, when it is mentioned that a first element (or component) is operated or executed on a second element (or component), the first element (or component) means that the second element (or component) It is to be understood that the operation or execution in the environment in which the operation or execution is performed or the operation or execution is performed directly or indirectly through interaction with the second element (or component).

When an element, component, device, or system is referred to as including a component made up of a program or software, the element, component, device, or system may be executed or operated by the element, component, device, or system even if no explicit mention is made. It should be understood to include hardware necessary to run (eg, memory, CPU, etc.) or other programs or software (eg, an operating system or drivers needed to run the hardware, etc.).

In addition, it is to be understood that an element (or component) may be implemented in software, hardware, or any form of software and hardware, unless otherwise specified in the implementation of any element (or component).

Also, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, the words 'comprises' and / or 'comprising' do not exclude the presence or addition of one or more other components.

1 is a network diagram of a PTZ precision control system using a viewing angle of a CCTV camera according to an embodiment of the present invention.

As shown in Figure 1, a CCTV camera () is installed. The CCTV camera 100 may be installed anywhere on the road, a place where security is required for various purposes, such as inside and outside the building.

The CCTV camera 100 may be PTZ (Pan-Tilt-Zoom) value can be controlled by a PTZ precision control server (hereinafter referred to as "control server") 200 using the viewing angle of the CCTV camera remotely.

The control server 200 remotely controls the CCTV camera 100, the algorithm for the control is different depending on the manufacturer and type of the camera applied to the CCTV camera 100, the basic information value and camera that the camera has Calculate the desired PTZ using the viewing angle of the CCTV camera 100 to control.

In the present embodiment, one CCTV camera 100 is shown for convenience of description, but this is not necessarily limited thereto. Practically, a plurality of CCTV cameras 100 may be remotely controllable with the control server 200.

2 is a block diagram of a PTZ precision control server using a viewing angle of a CCTV camera according to an embodiment of the present invention.

As shown, the control server 200 includes a communication unit 210, a storage unit 220, and a control unit 230.

The communication unit 210 transmits predetermined information to the CCTV camera 100 remotely connected to be controlled by the control server 200, or receives the information that the CCTV camera 100 wants to send to the control server 200.

In order to precisely control the CCTV camera 100, the controller 230 sequentially performs the following operations using basic information of the camera and a viewing angle of the camera. First, we define a virtual optical sensor. Secondly, the distance between the virtual optical sensor and the lens is calculated. Third, the horizontal viewing angle of the lens is calculated. Fourth, a virtual distance between the lens and the monitor screen is calculated. Fifthly, coordinate values input from the monitor screen are converted into coordinate values on the CCD screen. Sixth, the difference between the coordinates and the center of the monitor screen is calculated. Finally, the final pan and tilt values are determined by reflecting the previously calculated values. This operation will be described in more detail with reference to FIGS. 3 to 13.

The storage unit 220 stores all information necessary for the operation of the control server 200. For example, the storage unit 220 may hold basic information of the CCTV camera 100 managed by the control server 200.

3 to 12 are diagrams for explaining the formula formulation process for the PTZ precise control using the viewing angle of the CCTV camera according to an embodiment of the present invention.

Methods and equations described below are implemented in a built-in program (software) for the purpose of controlling the CCTV camera 100 in the control server 200. Here, CCD refers to a camera image pickup device (Charged Coupled Device), and VCCD (Virtual Charged Coupled Device) refers to a virtual CCD used in place of a real CCD in a program.

CCTV camera specifications on the market specify the size of the CCD. However, it is difficult to use the size of the CCD described in the specification as it is in the program. In this embodiment, the concept of VCCD is used. The CCD and the VCCD may be slightly different due to problems in program implementation. In general, the VCCD may be implemented in a smaller size than the CCD.

In the present embodiment, a method for precisely controlling the PTZ of a CCTV camera includes a definition of a VCCD, a distance between a VCCD and a lens, a horizontal viewing angle of a lens, a virtual distance between a lens and a monitor screen, a coordinate value conversion, and a coordinate value. Perform the procedure of calculating the difference between the center of the monitor screen and determining the final pan and tilt values. In this process, a formula required for each step is defined, which will be described with reference to FIGS. 3 to 13.

3 to 6 are diagrams for determining values required for determining final pan values and final tilt values, such as angles and distance values between elements, according to the arrangement of the VCCD, the lens, and the monitor screen.

Referring to FIG. 3, when the distance of the VCCD is CW, the horizontal viewing angle value VA when the zoom value of the lens is 1 and the initial distance FL of the VCCD and the lens are used to determine CW. Here, VA and FL utilize the information described in the camera technical specification of the CCTV camera 100. CW is calculated by the equation (1).

For example, when VA is 62.38 and FL is 4.4, the calculation result of CW = tan (62.38 / 2 * π / 180) * 4.4 * 2 = 5.327370439937655 can be obtained.

Referring to FIG. 4, it means that the initial distance FL between the VCCD and the lens is changed. Here, when the distance between the VCCD and the lens is changed from FL (initial distance between the VCCD and the lens) to FL '(the current focal length between the VCCD and the lens), the FL in the state of the zoom value Z of the current lens is Calculate how much is'. FL 'is calculated by equation (2).

For example, when FL is 4.4 and Z value is 1, the calculation result of FL '= 4.4 * 1 = 4.4 can be obtained.

Referring to FIG. 5, in the drawing illustrated in FIG. 3, the distance between the VCCD and the lens and the lateral viewing angle at the current zoom value are changed. The initial lateral reagent angle is called VA, and the changed lateral viewing angle is called VA '. Therefore, VA 'means the horizontal viewing angle in the state of the current zoom value. As the zoom value changes, the lateral viewing angle changes along with the distance between the VCCD and the lens. The modified transverse viewing angle VA 'is calculated by the equation (3).

For example, as calculated in the previous equation, when CW = 5.327370439937655 and FL '= 4.4, a calculation result of VA' = atan (5.327370439937655 / 2 / 4.4) * 2 * 180 / π) = 62.379999999999995 can be obtained. .

Referring to FIG. 6, in the state illustrated in FIG. 3, in a state in which FL is changed to FL ′ and VA is changed to VA ′, the distance between the lens and the monitor screen is defined as a virtual distance. Indicates that an imaginary distance should be calculated. This imaginary distance is called IF and is calculated by the following equation.

In Equation 4, WF means the horizontal length (size) of the optimized monitor screen, that is, the horizontal size of the actual image sent by the camera sensor. Therefore, WF is not calculated separately, but uses a numerical value obtained from a camera sensor.

For example, when WF is 1920 and VA 'is 62.379999999999995, the calculation result of IF = (1920/2) / tan (62.379999999999995 / 2/180 * π) = 1585.7729615849403 can be obtained.

7 shows an actual CCD screen and a screen displayed on a monitor screen by the user's designation.

When the user selects a specific point in the projection captured by the CCTV camera 100 displayed on the monitor, the image of the screen should move so that the selected specific point is located at the center of the screen. To do this, first of all, the coordinates of a specific point selected by the user must be known.

In addition, the size of the screen optimized for CCD is already determined, but the size of the screen viewed by the user is not constant. Therefore, it is necessary to adjust the coordinates of the point selected by the user to the size of the screen optimized for CCD. Shall be.

(a) is a screen shown to the user, the point with the cross mark is the center of the screen, and the circled point corresponds to the specific point selected by the user. The coordinate of the specific point selected by the user is called (X, Y).

(b) is the actual CCD screen, where the cross mark is the center of the screen, and the circled point corresponds to the specific point selected by the user in (a). The coordinate of this point is called (X ', Y').

The X 'value and the Y' value can be calculated from the X value and the Y value. X 'and Y' are calculated by the equation (5).

Here, WF is the horizontal size of the CCD screen, WF 'is the horizontal size of the user display screen, that is, the monitor screen, HF is the vertical size of the CCD screen, and HF' is the vertical size of the user display screen, that is, the monitor screen. That is, WF and HF correspond to the horizontal and vertical sizes of the screen shown in (b), and WF 'and HF' correspond to the horizontal and vertical sizes of the screen shown in (a).

That is, the present embodiment means that a task of converting the coordinates obtained from the screen (a) to the coordinates of the screen is necessary. Equation 5 can be used to convert the coordinate values of the two screens.

For example, when (a) the screen size is 200 × 600 and (b) the screen size is 1080 × 1920, the coordinates of the point selected by the user on the screen (a) are (400, 150). That is, WF = 1920, WF '= 600, HF = 1080, HF' = 200, X = 400, Y = 150. Applying this to Equation 5, a calculation result of X '= (400/600) * 1920 = 1280 and Y' = (150/200) * 1080 = 810 can be obtained.

After calculating X 'and Y', the coordinate value of the point selected by the user on the actual CCD screen of (b) is converted into the difference value with the center of the screen. Since the tilt value and the pan value must be converted at the center of the CCD screen to reach the point selected by the user, the coordinate value of the point selected by the user on the CCD screen and the difference between the center of the screen are required.

 The difference value with the center of a coordinate is called X ", the difference value with the center of a Y coordinate is called Y", and X "and Y" are computed by Formula (6).

For example, if WF is 1920, HF is 1080, X 'is 1280, and Y' is 810, then X "= ((1920/2) -1280) * (-1) = 320, Y" = ( A calculation result of (1080/2) -810) * (-1) = 270 can be obtained.

As shown in (c), coordinates indicated by circles correspond to (X ', Y'), and these coordinates become (1280, 810). Further, the difference value X "in the X direction with respect to the center is 320, and the difference value Y" in the Y direction is 270.

8 to 10 are diagrams for deriving a formula required to calculate the fan rotation angle.

Referring to Fig. 8, the length of the straight line from the center of the lens to the point shifted by Y "should be known to obtain the pan value after the tilt value is moved. As shown, the center point of the monitor screen is straight from the center of the lens. The reference line is referred to as a reference line, and the first point P1 moved by Y ″ from the center and the center point of the lens is connected to the first line. Here, the reference line corresponds to IF, which is a virtual distance between the lens and the monitor screen, and an angle formed by the reference line and the first line is referred to as CT. CT is computed by (7).

In Equation 7, NT denotes a current tilt value and is a value obtained from a camera.

For example, if NT is 17.47, Y "is 270, and IF is 1585.7729615849403, a calculation result of CT = 17.47 + (atan (270 / 1585.7729615849403) * (180 / π)) = 27.132744226087112 can be obtained.

Referring to FIG. 9, in order to obtain the pan value after the tilt value is moved, the length of the straight line from the center of the screen to the point moved by Y ″, that is, the length of the first line, must be obtained. The length of the first line is DY. Calculated by Equation (8).

Referring to FIG. 10, finally, in order to obtain a pan value after the tilt value is moved, an angle from the point moved by Y ″ to the point moved by X ″ on the X axis must be obtained.

The point moved by X ″ from the first point P1 is referred to as the second point P2 and is called a second line by connecting the center of the lens and the second point P2. In this case, the first line and the second line The angle formed by the line must be obtained, which is called P ', which is calculated by Equation 9.

For example, if DY is 1279.4474931420862 and X "is 320, the calculation result of P '= atan (320 / 1279.4474931420862) * (180 / (pi)) = 14.04206500777286 can be obtained.

Using the calculation result, the final fan value is calculated by the equation (10). The final pan value is called P.

In Equation 10, NP is a current pan value and uses a value obtained from a camera sensor.

For example, if NP is 40.58 and P 'is 14.04206500777286, the calculation result of P = 40.58 + 14.04206500777286 = 54.62206500777286 can be obtained.

11 to 12 are diagrams for calculating the tilt rotation angle.

In the present embodiment, the third line connected to be perpendicular to the virtual distance IF from the center C of the lens, the point that the center C of the lens faces when the center C of the lens and the tilt value are changed. The third point P3 is connected to define a fourth line. A triangular surface having two sides of the third line and the fourth line is formed, which is indicated by hatching. In addition, one end of the virtual distance IF that is not in contact with the center C of the lens and the third point P3 are connected to define a fifth line.

Since the purpose is to find the tilt value, first of all, the length of the third line must be known, and secondly, the length of the fifth line must be known. Once the lengths of the third and fifth lines are known, the final tilt value can be calculated.

The length of the third line is calculated by the equation (11). In this case, the length of the third line is referred to as VF.

For example, if IF is 1585.7729615849403 and CT is 36.21274422608711, a calculation result of VF = 1585.7729615849403 / tan (36.21274422608711 * π / 180) = 2165.673097604324 can be obtained.

The length of the fifth line is calculated by the equation (12). In this case, the length of the fifth line is referred to as PF.

For example, if VF is 2165.673097604324 and P 'is 14.04206500777286, a calculation result of PF = 2165.673097604324 / cos (14.04206500777286 * π / 180) = 2232.3814498187235 can be obtained.

Using the respective results obtained through Equations 1 to 12, the final tilt value is calculated. The final tilt value is a final desired tilt value for precise control of the camera and is referred to as T. The final tilt value T is calculated by the equation (13).

For example, if IF is 1585.7729615849403 and PF is 2232.3814498187235, a calculation result of T = atan (1585.7729615849403 / 2232.3814498187235) * (180 / π) = 35.38809583862428 can be obtained.

Overall, the final pan value and final tilt value are calculated by the equations (1) through (13). Thereby, the PTZ of the CCTV camera 100 can be precisely controlled.

13 is a flowchart illustrating a method for precisely controlling PTZ using a viewing angle of a CCTV camera according to an exemplary embodiment of the present invention.

The control unit 230 of the control server 200 defines a virtual optical sensor (S300), and calculates the distance between the virtual optical sensor and the lens (S310).

Thereafter, the horizontal viewing angle of the lens is calculated (S320), and a virtual distance between the lens and the monitor screen is calculated (S330).

In addition, the coordinate value input from the monitor screen is converted into the coordinate value of the CCD screen (S340), and the difference value between the converted coordinate value and the center of the monitor screen is calculated (S350).

Thereafter, the controller 230 calculates the final pan value and the final tilt value (S360 and S370), and transmits the calculated final pan value and the final tilt value to the CCTV camera 100 through the communication unit 210 to the CCTV camera 100. Precise control of PTZ.

By this operation, the final pan value and the final tilt value are calculated using the minimum information provided by the CCTV camera manufacturer and the information obtained from the viewing angle of the CCTV camera 100, so that PTZ can be precisely controlled even with very basic information. I can regulate it.

Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, the embodiments described above are to be understood in all respects as illustrative and not restrictive. The scope of the invention is indicated by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the invention. do.

100: CCTV camera 200: control server

Claims (17)

Defining a virtual optical sensor based on a charged coupled device (CCD);
Calculating a distance between the defined virtual optical sensor and the lens;
Calculating a horizontal viewing angle of the lens in a current zoom state;
Calculating a virtual distance between the lens and the monitor screen according to the size of the monitor screen;
Converting a coordinate value input from the monitor screen into a coordinate value of the CCD screen;
Calculating a difference value between a coordinate value of the converted CCD screen and a central portion of the monitor screen;
Determining a final Pan value by using the calculation result; And
Determining a final tilt value using the calculation result;
Converting the coordinate value of the CCD screen, the coordinate value is calculated by the following formula to convert the coordinate value of the CCD screen to the calculated coordinate value,

Computing the difference value between the coordinate value of the converted CCD screen and the center of the screen, the difference value is calculated by the following formula,

Determining the final Pan value,
Generating a reference line by connecting the center of the lens and the center point of the monitor screen in a straight line;
Generating a first line by connecting a center of the lens and a first point moved by the Y coordinate of the difference value from the center point;
Determining an angle between the reference line and the first line;
Calculating a length of the first line;
Generating a second line by connecting the center of the lens with a second point moved by the X coordinate of the difference value from the first point;
Determining an angle between the first line and the second line; And
Computing the final pan value according to the current pan value and the changed pan value; PTZ precision control method using a viewing angle of the CCTV camera comprising:
Here, X 'and Y' is the coordinate value of the converted CCD screen, X and Y is the input coordinate value, WF is the horizontal size of the CCD screen, WF 'is the horizontal size of the monitor screen, HF is the vertical size of the CCD screen, HF 'is the vertical size of the monitor screen, and X''andY''are the difference value coordinates. The method of claim 1,
The defining step is,
PTZ precision control method using the viewing angle of the CCTV camera, characterized in that for calculating the horizontal length of the virtual optical sensor by the following formula:

Here, CW is the horizontal length of the virtual optical sensor, VA is the initial viewing angle, FL is the initial distance of the virtual optical sensor and the lens. The method of claim 2,
Calculating the distance between the defined virtual optical sensor and the lens,
PTZ precision control method using the viewing angle of the CCTV camera, characterized in that for calculating the distance between the virtual optical sensor and the lens by the following formula:

FL 'is a distance between the virtual optical sensor and the lens. The method of claim 3, wherein
Computing the horizontal viewing angle,
PTZ precision control method using the viewing angle of the CCTV camera, characterized in that for calculating the lateral viewing angle by the following formula:

VA ′ is the transverse reagent angle. The method of claim 4, wherein
Calculating a virtual distance between the lens and the monitor screen,
PTZ precision control method using the viewing angle of the CCTV camera, characterized in that for calculating the virtual distance by the following formula:

Where IF is the imaginary distance. delete delete delete The method of claim 1,
Determining an angle between the reference line and the first line,
PTZ precision control method using the viewing angle of the CCTV camera, characterized in that for calculating the angle by the following formula:

Here, CT is an angle between the reference line and the first line, and NT is the current tilt value. The method of claim 9,
Calculating the length of the first line,
PTZ precision control method using the viewing angle of the CCTV camera, characterized in that for calculating the length by the following formula:

Where DY is the length of the first line. The method of claim 10,
Determining an angle between the first line and the second line,
PTZ precision control method using the viewing angle of the CCTV camera, characterized in that for calculating the angle by the following formula:

Here, P 'is an angle formed by the first line and the second line. The method of claim 11,
Computing the final fan value,
PTZ precision control method using the viewing angle of the CCTV camera, characterized in that for calculating the final pan value by the following formula:

Where P is the final fan value and NP is the current fan value. The method of claim 12,
Determining the final tilt (Tilt) value,
A third line connected at right angles to the imaginary distance from the center of the lens, and a fourth line connecting the third point which is the point the center of the lens faces when the tilt value of the lens is changed. Forming a triangular surface to be a side;
Determining a length of the third line constituting the triangular face;
Determining a length of one end of the virtual distance that is not in contact with the center of the lens and a fifth line connecting the third point; And
And calculating the final tilt value by reflecting the determined lengths of the fourth and fifth lines. The method of claim 13,
Determining the length of the third line,
PTZ precision control method using the viewing angle of the CCTV camera, characterized in that for determining the length of the third line by the following formula:

Where VF is the length of the third line. The method of claim 14,
Determining the length of the fifth line,
PTZ precision control method using the viewing angle of the CCTV camera, characterized in that for calculating the length of the fifth line by the following formula:

Here, PF is the length of the fourth line. The method of claim 15,
Calculating the final tilt value,
PTZ precision control method using the viewing angle of the CCTV camera, characterized in that for calculating the final tilt value by the following formula:

Where T is the final tilt value. Based on the Charged Coupled Device (CCD), the virtual optical sensor is defined, the distance between the defined virtual optical sensor and the lens is calculated, the horizontal viewing angle of the lens is calculated in the current zoom state, Calculating a virtual distance between the lens and the monitor screen, converting a coordinate value input from the monitor screen into a coordinate value of the CCD screen, and a difference between the coordinate value of the converted CCD screen and the center of the monitor screen; A controller configured to calculate a value, determine a final pan value using the calculation result, and determine a final tilt value using the calculation result; And
And a communication unit which transmits the determined final pan value and the final tilt value to a camera.
The control unit calculates the coordinate value by the following formula and converts the coordinate value of the CCD screen into the calculated coordinate value,

The control unit calculates a difference value between the coordinate value of the converted CCD screen and the center of the screen by the following formula,

The controller generates a reference line by connecting the center of the lens and the center point of the monitor screen in a straight line, and connects the center of the lens with a first point moved by the Y coordinate of the difference value from the center point to a first line. Generating a line, determining an angle between the reference line and the first line, calculating a length of the first line, and moving the center of the lens by the X coordinate of the difference value from the first point A second line is generated by connecting two points, the angle between the first line and the second line is determined, and the final pan value is calculated based on a current pan value and a changed pan value. PTZ precision control server using:
Here, X 'and Y' is the coordinate value of the converted CCD screen, X and Y is the input coordinate value, WF is the horizontal size of the CCD screen, WF 'is the horizontal size of the monitor screen, HF is the vertical size of the CCD screen, HF 'is the vertical size of the monitor screen, and X''andY''are the difference value coordinates.

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