KR100579456B1 - Method for setting a masking block - Google Patents

Abstract

The present invention relates to a method for setting a masking block. For example, in a surveillance camera equipped with a zoom lens, an offset corresponding to a separation distance between a central axis of a CD and an optical axis of a lens is provided. Value is calculated and stored in the memory, and when the zoom magnification is changed during the privacy masking process by the surveillance camera, the current zoom magnification and the offset value stored in the memory are stored. By referring to the enlarged output of the masking block superimposed on a specific subject in the captured image, even when the CD axis is mounted in a state in which the CD axis does not coincide with the optical axis of the lens due to an error in the manufacturing process, It is possible to generate and display a masking block suitable for a particular subject that has been abnormally enlarged, so that one of a specific subject for which privacy protection is required It is a very useful invention that the part can effectively prevent the exposure display due to the zoom operation.

Surveillance Cameras, Privacy Masking, Zoom Ratio, Offset Values, Tele-End, Wide-End, Position Coordinates, Specific Subjects, Masking Blocks

Description

Masking block setting method {Method for setting a masking block}             

1 illustrates a configuration of a general surveillance camera,

2 to 5 illustrate an embodiment of a privacy masking process in a general surveillance camera,

6 illustrates an embodiment of a process for setting a masking block according to the present invention;

7 is a flowchart illustrating a method of setting a masking block according to the present invention.

※ Explanation of code for main part of drawing

10: zoom lens 11: focus lens

12: Iris 13: CD

14: A / D converter 15: digital signal processing unit

16 control unit 17 masking generation unit

18: memory

The present invention relates to a method for setting a masking block. For example, in a surveillance camera equipped with a zoom lens, when a privacy masking process is performed on a specific subject, the optical axis of the lens and the CD center axis are provided. The present invention relates to a method of setting a masking block for allowing a masking process for a specific subject enlarged by a zoom operation to be normally performed by reflecting an offset value of.

Fig. 1 shows a configuration of a general surveillance camera. For example, a zoom camera 10, a focus lens 11, an iris 12, and a CC can be used for a surveillance camera capable of adjusting zoom magnification. A charge coupled device (CCD) 13, an A / D converter 14, a digital signal processor 15, a controller 16, and a memory 18 are included.

In addition, in the surveillance camera configured as described above, in order to protect the privacy of a specific subject included in the captured image, a masking generation unit 17 for superimposing and displaying a masking block such as a mosaic image, etc. It is configured to include more.

For example, as illustrated in FIG. 2, A, B, C, D, and E subjects are included in the surveillance video image captured in the 1x zoom state (Zoom Status = x1) and displayed at the center. When privacy protection for the subject A is requested, the controller 16 controls the masking generator 17 to display a masking block of a predetermined size on the subject A by a user's key input. Done.

That is, when the user selects and designates the start position coordinate values (Xs, Ys) and the end position coordinate values (Xe, Ye) on which the masking block is to be superimposed, the masking generator 17 is operated with reference to the values. By controlling, as shown in FIG. 2, a masking block having a predetermined size is displayed superimposed on the A subject image to perform a series of operations so that the A subject is not displayed in the surveillance video image.

On the other hand, the control unit 16, when changing the zoom magnification by changing the position of the zoom lens 10 by the user's key input or the like, for example, as shown in Figure 3, zoom 1x When changing from the status (Zoom Status = x1) to the 16x zoom status (Zoom Status = x16), the current zoom magnification is used to enlarge a masking block of a predetermined size superimposed and displayed on the subject A enlarged by the zoom magnification increase. After confirming, the masking generating unit 17 is operated to perform a series of operations to enlarge the size of the masking block.

However, when the CD 13 is incorrectly mounted on the PCB, for example, as shown in FIG. 4, the CD 13 is mounted on the printed circuit board so that the center axis of the CD coincides with the optical axis of the lens. Although it should be, when the central axis of the CD is mounted in a state that does not coincide with the optical axis of the lens due to an error in the manufacturing process, as shown in FIG. 5, when the zoom magnification is increased, A is enlarged and displayed. The subject is zoomed out of the center of the surveillance video image.

Accordingly, the masking block enlarged and displayed by the zoom magnification is enlarged to a size larger than the size set by the user, but is simply enlarged based on the center P of the previous masking block, so that the start of a wider range than before. Even if it is enlarged to the position coordinate values (Xs ', Ys') and the end position coordinate values (Xe ', Ye'), it is impossible to block all of the A subject enlarged by the zoom operation, so that privacy protection is required. A problem arises in which a part of the subject is exposed and displayed on the surveillance video image.

The present invention has been made to solve the above problems, for example, in a surveillance camera equipped with a zoom lens, when performing a privacy masking process for a particular subject displayed in the surveillance video image, To provide a method of setting a masking block to reflect the offset value corresponding to the separation distance between the optical axis and the central axis of the CD, so that the masking block suitable for a particular subject that is abnormally enlarged by the zoom operation can be superimposed The purpose is to.

A method of setting a masking block according to the present invention for achieving the above object comprises the steps of: detecting a separation distance between the central axis of the CD and the optical axis of the lens; And two steps of overlapping and displaying the masking block with reference to the previously stored offset value according to the screen adjustment magnification.

Hereinafter, a preferred embodiment of a method of setting a masking block according to the present invention will be described in detail with reference to the accompanying drawings.

First, as described above with reference to FIG. 1, the privacy masking processing method according to the present invention may be applied to a surveillance camera equipped with a zoom lens. In the controller 16, a user inputs a key or the like. When the zoom magnification is changed by variably shifting the position of the zoom lens 10, as shown in FIG. 6, for example, as shown in FIG. 6, a 16 × zoom status (Zoom Status = x1) is obtained. x16), the current zoom magnification is checked in order to display a masking block suitable for the A subject enlarged by the zoom magnification increase.

In addition, the control unit 16, even if the CD 13 is incorrectly mounted on a printed circuit board (PCB), the offset value corresponding to the separation distance between the central axis of the CD and the optical axis of the lens 6, the start position coordinate values (Xs ', Ys') and the end position coordinate values (Xe ', Ye') of the masking block suitable for the A subject abnormally enlarged and displayed by the zoom operation as shown in FIG. After calculating the operation, the masking generation unit 17 is controlled to display the masking block corresponding to the overlapping operation, which will be described in detail below.

7 is a flowchart illustrating a method of setting a masking block according to the present invention. For example, in the controller 16, as described above with reference to FIG. In order to check whether the printed circuit board is normally mounted to match the optical axis, move the position of the zoom lens to the wide end (Mide_End) which is the minimum zoom lens position by the user's key input, etc. The masking generator 17 is operation controlled with reference to the start position coordinate values Xs and Ys and the end position coordinate values Xe and Ye of the masking block.

In the masking generator 17, a masking block having a predetermined size corresponding to the start position coordinate values Xs and Ys and the end position coordinate values Xe and Ye is controlled according to the operation control of the controller. For example, as shown in FIG. 2, among the A, B, C, D and E subjects included in the surveillance video image, the subject A is displayed in the center of the surveillance video image. A series of operations are performed to prevent the display of S (S11).

In addition, the control unit 16 moves the position of the zoom lens 10 to the tele end Tele_End, which is the maximum zoom position, by the user's key input or the like, and the masking generation unit 17. By controlling the operation, the masking block of the size suitable for the subject A enlarged to the current zoom magnification, for example, 16 times zoom status (Zoom Status = x16) is enlarged and displayed (S12).

On the other hand, the user checks whether the A subject is normally blocked by the masking block enlarged and displayed through the above series of processes, for example, the CD is incorrectly mounted on the printed circuit board. As shown in FIG. 6, when all the A subjects are not blocked by the masking block, that is, when the masking process is not normally performed (S13), the display position of the masking block is variably adjusted (S14).

In the control unit 16, the start position coordinate values (Xs ', Ys') and the end position coordinate values (Xe ', Ye') of the masking block that are variably adjusted by the user have been previously enlarged and displayed automatically. The difference value is calculated by comparing the start position coordinate value and the end position coordinate value of the masking block (S15), and the calculated difference value is set as an offset value between the central axis of the CD and the optical axis of the lens. Thus, storage management is performed in the memory 18 (S16).

On the other hand, when the masking block that is automatically enlarged and displayed at the tele-end blocks all of the A subjects that are enlarged and displayed by the zoom operation without the masking block adjusting operation as described above, the controller 16 confirms the user's confirmation. By using a key or the like, an offset value between the central axis of the CD and the optical axis of the lens is set to zero and stored and managed in the memory (S17).

When the masking block is generated and displayed in the state in which the offset value is stored in the memory 18 (S18), the controller 16 checks the current zoom magnification and searches for the offset value. After the start position coordinate value and the end position coordinate value of the masking block reflecting the offset value are calculated, the masking generator 17 is controlled to operate.

In addition, as shown in FIG. 6, the masking generating unit 17 generates and displays a masking block suitable for the A subject so as to block all the A subjects that are enlarged and displayed by the zoom operation. In operation S19, the control unit 16 controls the masking generation unit 17 when the masking operation is requested to be terminated by a user's key input. In this superimposed state, the original surveillance video image can be output displayed.

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

In the method for setting a masking block according to the present invention configured and configured as described above, in a surveillance camera equipped with a zoom lens, an offset value corresponding to a separation distance between a central axis of a CD and an optical axis of a lens is calculated and stored in a memory. In addition, when the zoom magnification is changed during the privacy masking operation by the surveillance camera, the current zoom magnification and the offset value stored in the memory are superimposed on a specific subject in the captured image. By enlarging and outputting the masking block, a masking block suitable for a particular subject that is abnormally enlarged by the zoom operation, even when the CD axis is mounted in a state in which the CD axis does not coincide with the optical axis of the lens due to a manufacturing process error or the like, is provided. It can be created and displayed, zooming in on a specific subject where privacy protection is required. Due to the smaller will be very useful inventions that are able to effectively prevent the displayed exposure.

Claims (4)

Start / end position coordinate values of the masking block which are automatically enlarged and displayed as the zoom lens is changed from the wide end to the tele end state, and in the tele end state, the start / end of the masking block that is variably adjusted by a user's key input. Comparing the position coordinate values, and setting the difference value as an offset value and storing the difference value in a nonvolatile memory; And When adjusting the zoom magnification, the masking block is varied to a predetermined size by referring to the current zoom magnification and the offset value stored in the nonvolatile memory, and an arbitrary start / end position corresponding to the position at which the specific subject is variably displayed. And a step of superimposing the masking block on coordinates. delete The method of claim 1, As the zoom lens is changed from the wide end to the tele end state, the masking block that is automatically enlarged and displayed is offset when the user's confirmation key is input while all the specific subjects in the surveillance video image are blocked. Setting to zero), and storing in a nonvolatile memory. delete

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