KR20130102743A - Monitoring system for controlling the privacy mask display and method for using the same - Google Patents

Abstract

PURPOSE: A monitoring system for controlling a privacy mask display and a method for using the same are provided to display a privacy mask with a less error by moving a mask area around an optical center when a monitoring camera is panned or tilted. CONSTITUTION: An operation unit (520) receives a user setting command to select a privacy area not in need of being monitored from a photographed monitoring area. A controller (530) outputs a control signal according to the user setting command. An area setting unit (540) generates a plurality of vertexes to form a mask area according to the control signal. If the rotation angle of a camera unit (510) changes, an image processor (560) extracts a compensation value for the mask area from a memory (550) to display the mask area according to changes of the plurality of vertexes. [Reference numerals] (510) Camera unit; (520) Operation unit; (530) Controller; (540) Area setting unit; (550) Memory; (560) Image processor; (570) Output unit

Description

MONITORING SYSTEM FOR CONTROLLING THE PRIVACY MASK DISPLAY AND METHOD FOR USING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance system for controlling privacy mask display and a method thereof, and more particularly, to mask a privacy region included in a surveillance region photographed by a surveillance camera, to mask the privacy region. It relates to a monitoring system and a method for processing.

Recently, surveillance cameras have been installed in buildings and on the streets to prevent crime and theft. Images captured by such surveillance cameras are displayed on a monitor of a police station or a building management office to inform a user such as a police officer or a manager of the current state of a place where the surveillance camera is installed. As described above, a system for displaying an image captured by the surveillance camera through a predetermined monitor is called a surveillance system. A surveillance system includes a controller for adjusting the operation of the surveillance camera. You can control the operation.

1 is a view schematically showing a conventional monitoring system. As shown in FIG. 1, a conventional surveillance system includes a surveillance camera 10, a monitor 20, and a controller 30.

The surveillance camera 10 has a CCD (Charge Coupled Device) lens unit 15 for photographing a predetermined surveillance region and the lens unit 15 in a 360 degree horizontal direction (Pan) and in a 180 degree vertical direction ( And a driving unit (not shown) for driving to perform a tilt and zoom operation.

The monitor 20 converts an image signal corresponding to the surveillance region captured by the surveillance camera 10 into an image signal corresponding to the display method of the monitor 20, and displays the image signal on the camera screen 25.

The controller 30 receives a user's adjustment command for adjusting the surveillance camera 10 and a user's setting command for setting an operation of the monitor 20 through an operation key or a joystick. The controller 30 outputs a control signal for controlling the surveillance camera 10 and the monitor 20 according to various commands received.

2 is a diagram illustrating an embodiment in which a general surveillance camera is panned and tilted by rotation in a horizontal direction or a vertical direction.

The surveillance camera, for example, a PTZ surveillance camera equipped with a pan / tilt / zoom function, may be mounted and used in a pan / tilter attached to a ceiling of a specific place to be monitored.

The surveillance camera may change the surveillance region in another direction by a panning operation rotated in the horizontal direction by the pan / tilt and a tilting operation rotated in the vertical direction. The zoom lens may be adjusted to enlarge or capture a subject.

3 is a diagram illustrating a configuration of a general pan / tilt and a surveillance camera. As shown in FIG. 3, the surveillance camera 100 includes a zoom lens 110, a focus lens 120, an iris 130, a CCD 140, a digital signal processor 150, a microcomputer 160, an interface ( 170, a mask generator 180, and the like, and the pan / tilt 200 includes a fan motor 210, a tilt motor 220, a step motor driver 230, a pan / tilt microcomputer 240, and the like. Can be.

The fan motor 210 and the tilt motor 220 each use a step motor. In the pan / tilt microcomputer 240, the fan motor is positioned such that the position of the surveillance camera is a desired shooting angle of the user. While rotating the 210 and the tilt motor 220, counting the number of rotation steps of the fan motor and the tilt motor, detecting the pan angle and the tilt angle, the pan is set to the shooting angle of the surveillance camera desired by the user. / Tilt control operation will be performed.

Therefore, the monitoring camera 100 changes the monitoring area by the panning operation (rotation in the horizontal direction) and the tilting operation (rotation in the vertical direction) of the pan / tilter 200, while the surveillance camera 100 You can monitor the entire area around the installation. The pan / tilter 200 may rotate 360 degrees in the panning direction and 180 degrees in the tilting direction as shown in FIG. 2.

Meanwhile, the microcomputer 160 of the surveillance camera controls the mask generator 180 according to a user's request, and superimposes and displays a mask image having a predetermined size on an arbitrary position in the surveillance video frame. Since a privacy mask image display operation is performed, a specific subject requiring privacy protection may not be included in the surveillance image and displayed.

For example, as shown in FIG. 4, after generating a mask image having a predetermined size so that a specific subject (for example, an operator) included in the surveillance image frame is not displayed for personal privacy protection, the image is superimposed on the corresponding position. Will be displayed. If a tilting operation is performed by the pan / tilter 200 while the mask image is overlapped as described above, in the microcomputer 160 of the surveillance camera, the pan / tilter microcomputer 240 By receiving the Pan / Tilt Control value provided from the camera, the rotation direction and the amount of rotation the surveillance camera rotates are calculated.

After calculating and detecting a position coordinate value at which the mask image is to be superimposed and displayed according to the rotation direction and the amount of rotation, the mask image is moved and displayed at a position corresponding to the position coordinate value. In this case, the center point of the mask area is the center of the camera screen. Therefore, there is a problem in that there is a difference between the center of the image and the optical center axis. That is, since the tilt angle and the panning angle of the camera are based on the optical center axis, an error occurs when the image is referred to as a difference between the center of the image and the optical center axis, that is, the optical center axis offset value is different.

In addition, when panning, the object rotates, and accordingly, the mask rotates according to the panning angle. However, when the object is long in the horizontal or vertical direction, even if the mask is rotated according to the panning angle, the mask does not cover the object and there is a problem in that a particular subject is temporarily exposed.

One embodiment of the present invention is to provide a surveillance system and method for displaying a privacy mask with less error by moving and displaying a mask area around an optical center axis during a panning or tilting operation of a surveillance camera.

In addition, another embodiment of the present invention is to provide a surveillance system and method for displaying a privacy mask to adjust the size of the mask area so that the subject is not exposed in accordance with the panning operation of the surveillance camera.

According to an embodiment of the present invention, a surveillance system for controlling the display of a privacy mask includes a camera unit for photographing a predetermined surveillance region, and an operation unit for inputting a user setting command for selecting a privacy region that does not require monitoring among the surveillance regions. And a control unit for outputting a control signal for setting a mask area for masking the privacy area according to the user setting command, and an area for generating a plurality of vertices for forming the mask area in response to the control signal. A memory for storing a compensation value of the mask area for each rotation angle of the camera unit, and a compensation value of the mask area according to the rotation angle of the camera unit is extracted from the memory when the rotation angle of the camera unit is changed. Change multiple vertices to display mask area And a video processing unit for controlling to.

In addition, the privacy mask display control method of the surveillance system according to an embodiment of the present invention comprises the steps of calculating the database compensation value of the mask area for each rotation angle of the surveillance camera, and changing the rotation angle of the surveillance camera And calculating position data of the mask region using a database for the mask region corresponding to the changed rotation angle, and displaying a mask according to the calculated position data.

According to an embodiment of the present invention, a privacy mask may be displayed with less error by moving and displaying a mask area about an optical center axis during a panning or tilting operation of a surveillance camera.

In addition, according to another embodiment of the present invention, the privacy mask may be effectively displayed by adjusting the size of the mask area according to the panning angle of the surveillance camera so that the subject is not exposed.

More specific effects of the invention will be described later in detail in the table of contents.

1 is a view schematically showing a conventional monitoring system.
2 is a diagram illustrating an embodiment in which a general surveillance camera is panned and tilted by rotation in a horizontal direction or a vertical direction.
3 is a diagram illustrating a configuration of a general pan / tilt and a surveillance camera.
4 is a diagram illustrating an embodiment in which a mask image superimposed and displayed by a general surveillance camera is moved and displayed by a tilting operation.
5 is a functional block diagram of a monitoring system according to an embodiment of the present invention.
6 is a view showing an embodiment of a three-dimensional coordinate system used in the monitoring system according to the present invention.
7 is a view showing an embodiment of a panning path according to the rotation of the surveillance camera in the horizontal direction according to the present invention.
8 is a diagram illustrating an embodiment of converting from a three-dimensional coordinate system to a two-dimensional coordinate system used in the monitoring system according to the present invention.
9 is a view showing an embodiment of moving the mask with respect to the optical center axis in the surveillance system according to the present invention.
10 is a view showing an embodiment of moving the mask area in the surveillance system according to the present invention.
11 illustrates another embodiment of moving a mask area in a surveillance system.
12 is a view showing an embodiment of adjusting the size of the mask area according to the rotation angle of the surveillance camera in the surveillance system according to the present invention.
13 is a flowchart of a privacy mask display control method of the monitoring system according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The suffix "module" and " part "for components used in the following description are given merely for ease of description, and the" module "and" part "

In addition, although an embodiment of the present invention will be described in detail with reference to the accompanying drawings and the contents described in the accompanying drawings, the present invention is not limited or limited by the embodiments.

As used herein, terms used in the present invention are selected from general terms that are widely used in the present invention while taking into account the functions of the present invention, but these may vary depending on the intention or custom of a person skilled in the art or the emergence of new technologies. In addition, in certain cases, there may be a term arbitrarily selected by the applicant, in which case the meaning thereof will be described in the description of the corresponding invention. Therefore, it is intended that the terminology used herein should be interpreted based on the meaning of the term rather than on the name of the term, and on the entire contents of the specification.

5 is a functional block diagram of a monitoring system according to an embodiment of the present invention. However, FIG. 5 is an embodiment for describing the present invention, and it is also within the scope of the present invention to delete some configuration modules or add new configuration modules according to the needs of those skilled in the art.

As shown in FIG. 5, the monitoring system 500 according to an embodiment of the present invention includes a camera unit 510, an operation unit 520, a control unit 530, an area setting unit 540, a memory 550, The image processor 560 and the output unit 570 are included.

The camera unit 510 photographs a predetermined surveillance area. For example, the camera unit 510 may be a PTZ surveillance camera equipped with a pan / tilt / zoom function to smoothly capture the surveillance area. Therefore, it may include a pan / tilter attached to the ceiling of a specific place to be monitored, and can be mounted and used therein.

The camera unit 510 may change the surveillance region in another direction by a panning operation rotated in the horizontal direction by the pan / tilt and a tilting operation rotated in the vertical direction. By adjusting a zoom lens provided in the surveillance camera, the subject may be enlarged or reduced in size.

The camera unit 510 may be applied to the surveillance camera 100 described with reference to FIG. 3. As shown in FIG. 3, the surveillance camera 100 includes a zoom lens 110, a focus lens 120, an iris 130, a CCD 140, a digital signal processor 150, a microcomputer 160, an interface ( 170, a mask generator 180, and the like, and the pan / tilt 200 includes a fan motor 210, a tilt motor 220, a step motor driver 230, a pan / tilt microcomputer 240, and the like. Can be.

The fan motor 210 and the tilt motor 220 each use a step motor, and in the pan / tilt microcomputer 240, the fan motor is configured such that the attitude of the surveillance camera is a desired shooting angle of the user. While rotating the 210 and the tilt motor 220, counting the number of rotation steps of the fan motor and the tilt motor, detecting the pan angle and the tilt angle, the pan is set to the shooting angle of the surveillance camera desired by the user. / Tilt control operation will be performed.

Therefore, the monitoring camera 100 changes the monitoring area by the panning operation (rotation in the horizontal direction) and the tilting operation (rotation in the vertical direction) of the pan / tilter 200, while the surveillance camera 100 You can monitor the entire area around the installation. The pan / tilter 200 may rotate 360 degrees in the panning direction and 180 degrees in the tilting direction as shown in FIG. 2.

On the other hand, the operation unit 520 receives a user setting command for selecting a privacy area that does not require monitoring among the monitoring areas monitored by the camera unit 510, and the controller 530 receives the privacy setting area according to the user setting command. A control signal for setting a mask area for mask processing is output.

The area setting unit 540 generates a plurality of vertices that form the mask area in response to the control signal, and the image processing unit 560 includes the mask area formed of a plurality of vertices set by the area setting unit 540. Accordingly, the privacy area photographed by the camera unit 510 is masked in a mosaic manner. The output unit 570 displays the masked mask area.

As such, since a privacy mask image display operation of overlapping and displaying a mask image having a predetermined size is displayed at an arbitrary position in the surveillance image frame, a specific subject requiring privacy protection is included in the surveillance image. It can be suppressed.

The memory 550 stores a compensation value of the mask area for each rotation angle of the camera unit 510. The compensation value means a position data value for moving the mask area according to the rotation angle. Accordingly, the memory 550 is a position data having an x and y coordinate on a two-dimensional coordinate system for each of the rotation angles in the horizontal direction and the rotation angle in the vertical direction of the camera unit 510 on a hemispherical three-dimensional coordinate system. The compensation value of the mask area is stored.

6 is a view showing an embodiment of a three-dimensional coordinate system used in the monitoring system according to the present invention. The three-dimensional coordinate system may use a hemispherical or spherical shape. When the camera unit 510 performs a horizontal rotation, that is, a panning operation, the object (or the subject) may have an elliptic orbit as illustrated in FIG. 6. And move. This is the same as Arctic's travel path by the Earth's rotation in the Arctic. As the vertical rotation of the camera unit 510, i.e., the tilt angle approaches 0 degrees (the equator to the earth), the size of the elliptical orbit increases, and the closer to 90 degrees (the pole to the earth), the ellipse The size of the orbit is small, and the ellipse is zero if the tilt angle is 90 degrees.

7 is a view showing an embodiment of a panning path according to the rotation of the surveillance camera in the horizontal direction according to the present invention. When the camera unit 510 rotates (tilts) in the vertical direction and rotates (pans) in the horizontal direction, the position of the mask must also move. The position information of the camera unit 510 receives a pan / tilt control value provided from the pan / tilt micom 240 at the microcomputer of the camera unit 510, and the camera unit 510 rotates. The rotation direction and the amount of rotation are calculated.

However, as shown in FIG. 7, when the tilt angle is 90 degrees, the object moves horizontally on the screen (710). However, the closer the tilt angle is to 0 degrees, the more it moves to the shape 720 of the curve and eventually to the elliptic orbit.

8 is a diagram illustrating an embodiment of converting from a three-dimensional coordinate system to a two-dimensional coordinate system used in the monitoring system according to the present invention. As described above, unless the tilt angle is 90 degrees when the camera unit 510 moves, the object moves in an elliptic orbit, so that an ellipse is converted to position data having x and y coordinates on a two-dimensional coordinate system on a three-dimensional coordinate system. The long axis and short axis of the track should be obtained for each tilt angle, and the x and y coordinates should be calculated according to the following equation.

(a is 1/2 of major axis, b is 1/2 of minor axis)

As described above, the memory 510 stores both x and y coordinates for compensation for each rotation angle. The object movement path on the screen due to the panning operation varies depending on the tilt angle. That is, since the shapes of the ellipses are all different, the (a, b) value table may be created for each tilt angle and the x and y values may be stored, or the image processor 560 may calculate the x and y values.

Accordingly, the image processor 560 reads the a and b values corresponding to the current tilt angle from the memory 550, calculates how much to move the mask to the pan angle and a and b (offset, offset). And, it can be controlled to move the mask up / down by the tilt angle, and to move the mask up / down / left / right by the angle of the pan to display.

However, as shown in the equation, the memory 550 stores the length of the long axis and the short axis of the elliptic orbit for which the object is drawn based on the optical center axis for each rotation angle in the horizontal and vertical directions of the camera unit. . The tilt angle and panning angle of the camera are based on the optical center axis. An error occurs when the center of the image is used. Therefore, the optical center axis is calculated using the optical center axis offset value in order to reduce the difference between the image center and the optical center axis, that is, the deviation caused by the difference in the optical center axis offset value.

Since the privacy mask has to be changed in size and position with respect to the optical center axis as the zoom magnification is changed, the position or offset of the optical center axis when the CCD center axis and the optical center axis of the lens do not coincide. The value must be measured and managed in advance and can be stored in the memory 550.

When the tilt angle exceeds 90 degrees, the image in the photographing frame is rotated with respect to the center axis of the CCD, that is, the center of the frame, so that the position of the optical center axis also rotates with respect to the center of the frame. Therefore, when the tilt angle exceeds 90 degrees, the new optical center axis obtained by rotating the position of the optical center axis about the center of the frame can be managed to more accurately control the position of the privacy mask according to the change of the zoom magnification. There is an advantage.

9 is a view showing an embodiment of moving the mask with respect to the optical center axis in the surveillance system according to the present invention. An embodiment of moving the mask with respect to the optical center axis will be described with reference to FIG. 9.

When the tilt angle exceeds 90 degrees due to the tilting operation of the pan / tilt of the camera unit 510, the image processing unit 560 rotates the image in the frame with respect to the center axis of the CCD and at the same time the privacy mask of the CCD. Rotate the reference about the central axis.

When the zoom magnification is changed while the tilt angle exceeds 90 degrees and the image and the privacy mask in the frame are rotated about the central axis of the CCD, the image processing unit 560, as shown in FIG. 550 reads the position of the broad central axis and rotates it with respect to the center axis of the CCD to obtain a new optical center axis, adjusts the size of the privacy mask area according to the changed zoom magnification, and based on the obtained new optical center axis. Move the position of the privacy mask.

As such, when the rotation angle of the camera unit is changed, the image processor 560 extracts a compensation value of the mask area according to the rotation angle of the camera unit from the memory 550 to change the plurality of vertices to change the mask region. The output unit 570 is controlled. That is, position data corresponding to a mask area formed of a plurality of vertices having x and y coordinates on a two-dimensional coordinate system is converted into position data on an image coordinate system displayed on a screen of the camera unit 510 based on an optical center axis.

In this case, the image processing unit 560 divides the camera screen into a block including pixels of a predetermined unit in the image coordinate system, and then converts the position data on the image coordinate system into position data on the image coordinate system divided by the block. can do. Using an image coordinate system divided into blocks as described above has an advantage of easily calculating a mask region through linear equations using position data corresponding to a plurality of vertices.

10 is a view showing an embodiment of moving the mask area in the surveillance system according to the present invention. During the panning operation, that is, when the camera unit 510 rotates in the horizontal direction, the object 90 also rotates while drawing an elliptic orbit. Accordingly, as shown in FIG. 10, the mask 100 may also be rotated according to the panning angle to protect privacy.

11 is a diagram illustrating another embodiment of moving a mask area in a surveillance system. The purpose of the surveillance system is to move the mask together to prevent the object from being exposed as shown in FIG. 10, but the mathematical result and the actual moving value do not exactly match due to distortion caused by the lens. As illustrated in FIG. 11, there are problems in that regions 1100 and 1110 are exposed. In particular, this is the case when the object is not particularly square but has a particularly long horizontal or vertical length.

Therefore, when the camera unit 510 changes the rotation angle in the horizontal direction, the controller 530 outputs an adjustment signal to enlarge or reduce the size of the mask area corresponding to the rotation angle in the horizontal direction, thereby outputting the image. The processing unit 560 is controlled. The image processor 560 enlarges or reduces the size of the mask area based on the calculated diagonal length of the mask area in proportion to or inversely proportional to the rotation angle in the horizontal direction in units of 90 degrees in response to the adjustment signal.

12 is a view showing an embodiment of adjusting the size of the mask area according to the rotation angle of the surveillance camera in the surveillance system according to the present invention. As shown in FIG. 12, when the panning angle is 0 degrees, when the diagonal length of the mask at 0 degrees is 'a', the horizontal and vertical lengths of the mask area are also adjusted until the panning angle is 90 degrees. When the length is proportional to 90 degrees, the horizontal and vertical lengths should be 'a'.

In addition, until the panning angle is 90 degrees to 180 degrees, the horizontal and vertical lengths are inversely proportional to the angles, and when the angle is 180 degrees, the diagonal length of the mask becomes 'a' again. In this form, the length and width of the mask area are increased until the diagonal length of the maximum mask area is proportional to the rotation angle from 180 degrees to 270 degrees, and the size of the mask area is reduced again when the angle is 270 degrees to 360 degrees. can do.

As such, when the size of the mask is adjusted, the size of the mask is much larger than that of the object, thereby reducing the area where the object is exposed even for a while due to lens distortion.

FIG. 13 is a flowchart illustrating a privacy mask display control method of a surveillance system according to an exemplary embodiment of the present invention. Referring to FIG. 13, a method of controlling privacy mask display in a surveillance system will be described. However, even if the detailed description of the overlapping with the above-described monitoring system is omitted, it will be difficult for those skilled in the art to understand the present invention, and thus detailed descriptions of the overlapping matters will be omitted.

The compensation value of the mask area for each rotation angle of the surveillance camera is calculated and databased (S1300). At this time, the position data having x and y coordinates on the two-dimensional coordinate system can be calculated and databased using the rotation angles in the horizontal and vertical directions of the surveillance camera on the hemispherical three-dimensional coordinate system. In addition, when the rotation angle of the surveillance camera in the vertical direction is larger than a predetermined angle, the position of the optical center axis can be database together with a new optical center axis obtained by rotating the reference to the center of the frame.

Accordingly, according to the rotation angle of the surveillance camera, the compensation value of the mask area is calculated from the position data having x and y coordinates on the two-dimensional coordinate system using the lengths of the long and short axes of the elliptic orbits drawn by the object by rotation. Can be databased.

Taking a surveillance area by using the surveillance camera (S1310), and checking whether the rotation angle of the surveillance camera is changed (S1320), and the rotation angle includes both the rotation angle in the horizontal direction and the rotation angle in the vertical direction of the surveillance camera. Include.

When the rotation angle is changed, the changed mask area is calculated with reference to the database according to the changed rotation angle (S1330). Since the compensation value of the mask area for each rotation angle of the surveillance camera is stored in the database, new position data can be calculated by adding the compensation value to the position data before rotation of the mask area. In this case, the optical center axis may be stored together in the database to move the mask area with respect to the optical center axis, thereby enabling more accurate representation of the mask area.

In operation S1340, a mask is displayed corresponding to the calculated mask area. In this case, the position data corresponding to the mask area formed of a plurality of vertices having x and y coordinates on the two-dimensional coordinate system may be converted into position data on the image display system displayed on the screen of the surveillance camera about the optical center axis and displayed. . In addition, after dividing the screen of the surveillance camera into a block including pixels of a predetermined unit in the video coordinate system, the position data on the video coordinate system may be converted into position data on the video coordinate system divided by the block and displayed. .

Although not shown in FIG. 13, a process of adjusting the position data of the mask area calculated from the database may be further added. The mask area also moves along with the rotation of the camera. When the object is not square, a problem arises in that a part of the object is exposed out of the mask area due to the rotation. Accordingly, this is to reduce the problem of exposing the object by adjusting the size of the mask area to suit the size of the object. Accordingly, the size of the mask area can be enlarged or reduced in correspondence with the rotation angle of the surveillance camera in the horizontal direction.

In one embodiment of enlarging or reducing the size of the mask area, the size of the mask area is enlarged or reduced based on the calculated diagonal length of the mask area in proportion to the rotation angle of the surveillance camera in the horizontal direction. can do. That is, from 0 to 90 degrees, the mask area is enlarged in proportion to the rotation angle until one side of the mask area becomes the diagonal length of the first mask area, and from 90 to 180 degrees, the size of the mask area is returned to its original size. You can reduce the size of the mask area in inverse proportion to the rotation angle until it goes. You can adjust the mask area from 180 degrees to 270 degrees, as in 0 degrees to 90 degrees, and from 270 degrees to 360 degrees from 90 degrees to 180 degrees.

As such, when adjusting the size of the mask area corresponding to the rotation angle, there is an effect of greatly reducing the probability of the object being exposed.

Furthermore, although the drawings are shown for convenience of explanation, it is also possible to design a new embodiment to be implemented by merging the embodiments described in each drawing. It is also within the scope of the present invention to design a computer-readable recording medium in which a program for executing the previously described embodiments is recorded according to the needs of those skilled in the art.

The monitoring system and the control method for controlling the display of the privacy mask according to the present invention is not limited to the configuration and method of the embodiments described as described above, the embodiments are implemented so that various modifications can be made All or part of the examples may be optionally combined.

On the other hand, the privacy mask display control method of the monitoring system of the present invention can be implemented as processor-readable code on a processor-readable recording medium provided in the network device. The processor-readable recording medium includes all kinds of recording apparatuses in which data that can be read by the processor is stored. Examples of the recording medium that can be read by the processor include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may also be implemented in the form of a carrier wave such as transmission over the Internet . In addition, the processor-readable recording medium may be distributed over network-connected computer systems so that code readable by the processor in a distributed fashion can be stored and executed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention.

In this specification, both the invention and the invention of the method are explained, and the description of the two inventions can be supplementarily applied as necessary.

500 Surveillance System
510 Camera Unit 520 Operator Panel
530 Control Unit 540 Area Setting Unit
550 Memory 560 Image Processor
570 outputs

Claims (18)

A surveillance system for controlling the display of privacy masks,
A camera unit for photographing a predetermined surveillance area;
An operation unit for inputting a user setting command to select a privacy area of the monitoring area that is not required for monitoring;
A control unit outputting a control signal for setting a mask area for masking the privacy area according to the user setting command;
A region setting unit generating a plurality of vertices forming the mask region in response to the control signal;
A memory for storing a compensation value of the mask area for each rotation angle of the camera unit; And
And an image processor configured to extract a compensation value of the mask area according to the rotation angle of the camera part from the memory, and control the display to change the plurality of vertices to display the mask area when the rotation angle of the camera part is changed. Surveillance system to control the display. The method of claim 1,
The memory comprising:
And a compensation value of a mask area as position data having x and y coordinates on a two-dimensional coordinate system for each rotation angle in a horizontal and vertical direction of the camera unit on a hemispherical three-dimensional coordinate system. 3. The method of claim 2,
The memory comprising:
And a privacy mask display for storing the length of the major axis and the minor axis of the elliptical orbit drawn by the object by the rotation angle in the horizontal and vertical directions of the camera unit. The method of claim 1,
The memory comprising:
And storing the position of the optical center axis as a new optical center axis obtained by rotating the reference to the center of the frame when the rotation angle in the vertical direction of the camera portion is larger than a predetermined angle. 5. The method of claim 4,
Wherein the image processing unit comprises:
Controlling privacy mask display for converting position data corresponding to a mask area formed of a plurality of vertices having x and y coordinates on a two-dimensional coordinate system into position data on an image coordinate system displayed on the screen of the camera unit based on an optical center axis Surveillance system. The method of claim 5, wherein
Wherein the image processing unit comprises:
A privacy mask display for dividing the screen of the camera unit into blocks containing pixels of a predetermined unit in the image coordinate system, and then converting and displaying the position data on the image coordinate system into position data on the image coordinate system divided by the block. Surveillance system to control the. The method of claim 1,
The control unit,
When the camera unit changes the rotation angle in the horizontal direction, controlling the privacy mask display to control the image processor by outputting a control signal to enlarge or reduce the size of the mask area corresponding to the rotation angle in the horizontal direction Surveillance system. The method of claim 7, wherein
Wherein the image processing unit comprises:
Monitoring to control the privacy mask display to enlarge or reduce the size of the mask area based on the calculated diagonal length of the mask area corresponding to the rotation angle in the horizontal direction in units of 90 degrees according to the control signal of the controller system. In the privacy mask display control method of the surveillance system,
Calculating and compensating a compensation value of a mask area for each rotation angle of the surveillance camera;
Changing a rotation angle of the surveillance camera;
Calculating position data of a mask region using a database of the mask region corresponding to the changed rotation angle; And
And displaying a mask in accordance with the calculated position data. The method of claim 9,
Computing the database to calculate the compensation value of the mask area,
Display of the privacy mask of the surveillance system, which calculates and databases a compensation value using position data having x and y coordinates on a two-dimensional coordinate system on the hemispherical three-dimensional coordinate system using the rotation angles in the horizontal and vertical directions of the surveillance camera. Control method. 11. The method of claim 10,
Computing the database to calculate the compensation value of the mask area,
And a database of the position of the optical center axis as a new optical center axis obtained by rotating the position of the optical center axis relative to the center of the frame when the rotation angle of the surveillance camera in the vertical direction is larger than a predetermined angle. The method of claim 9,
Computing the database to calculate the compensation value of the mask area,
A database for calculating and compensating a mask area with position data having x and y coordinates on a two-dimensional coordinate system using a length of a long axis and a short axis of an elliptic orbit drawn by an object for each rotation angle of the surveillance camera. How to control privacy mask display. The method of claim 9,
The displaying of the mask according to the calculated position data may include:
And converting and displaying position data corresponding to a mask area formed of a plurality of vertices having x and y coordinates on a two-dimensional coordinate system into position data on an image coordinate system displayed on a screen of the surveillance camera about an optical center axis. How to control privacy mask display. The method of claim 13,
The displaying of the mask according to the calculated position data may include:
The surveillance system divides the screen of the surveillance camera into a block including pixels of a predetermined unit in the video coordinate system, and then converts and displays the position data on the video coordinate system into position data on the video coordinate system divided by the block. To control the display of privacy masks. The method of claim 9,
Adjusting the position data of the mask area calculated using the database, Privacy mask display control method of the surveillance system. 16. The method of claim 15,
Adjusting the position data of the calculated mask area,
And enlarge or reduce the size of the mask area corresponding to the rotation angle of the surveillance camera in a horizontal direction. 17. The method of claim 16,
Adjusting the position data of the calculated mask area,
And a magnification of the mask area based on the calculated diagonal length of the mask area corresponding to the rotation angle in the horizontal direction of the surveillance camera in units of 90 degrees. A computer-readable recording medium in which a program for executing any one of claims 9 to 17 is recorded.

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