KR20200129740A - method for adjusting lens pint of surveillance camera - Google Patents

Abstract

According to an embodiment of the present invention, a method for adjusting a lens pint of a surveillance camera to which a variable focus lens is applied comprises: a pint adjustment setting step of setting an environment for performing pint adjustment of a lens at a position wherein a surveillance camera is installed without separating and re-installing the surveillance camera; and a pint adjustment performing step of performing pint adjustment on the variable focus lens at the position wherein the surveillance camera is installed based on the environment set through the pint adjustment setting step.

Description

Method for adjusting lens pint of surveillance camera

Embodiments of the present invention relate to a surveillance camera, and more specifically, to a lens focus adjustment method of a surveillance camera capable of performing focus adjustment of a lens at an installed position without removal and reinstallation of the surveillance camera.

In general, a surveillance camera may be equipped with a zoom lens, a varifocal lens, or a fixed focus lens depending on the intended use. Zoom lenses are mainly used for cameras that frequently zoom in/zoom out, but they are expensive and control operations are complicated. On the other hand, fixed focus lenses are mainly used in low-cost cameras that do not require lens control because the focal length is fixed. On the other hand, a varifocal lens is a lens that can change the focal length according to the purpose of installation.It is relatively cheaper than a zoom lens, and it is easy to control the lens by using a method of manually shifting the focal length and focusing the lens. have.

However, in a surveillance camera with a variable focus lens, after the user moves the focal length using a zoom lens to suit the installation environment and purpose, the focus lens can be used so that the subject is in focus. Distortion may occur. In order to correct such a shift of focus, a process of mechanically adjusting the focus of the lens is necessary, and in the conventional case, a collimator, etc., after separating the module from the surveillance camera installed at a specific position for adjusting the focus of the lens. Focus adjustment of the lens is performed in a device or space that provides a special environment of, and after the adjustment is completed, the module must be reassembled and then the surveillance camera must be re-installed at the initial position.

In addition, if the focal length and focus are out of focus after re-installation of the surveillance camera, there is a disadvantage of having to re-disassemble and repeat adjustment.

In an embodiment of the present invention, in a lens focus adjustment method of a surveillance camera to which a variable focus lens is applied, lens focus adjustment is performed in a separate environment for performing lens focus adjustment, that is, in a state where a surveillance camera is installed without a collimator device. Provides a lens focus adjustment method of a surveillance camera capable of performing focus adjustment of a lens at an installed position without removal and reinstallation of the surveillance camera by providing an environment to be performed.

In order to achieve the above object, a method for adjusting lens focus of a surveillance camera according to an embodiment of the present invention includes, in a method for adjusting lens focus of a surveillance camera to which a variable focus lens is applied, the surveillance without removing and re-installing the surveillance camera. A focus adjustment setting step of setting an environment for performing focus adjustment of the lens at a position where the camera is installed; And performing focus adjustment of the variable focus lens at a position where the surveillance camera is installed based on an environment set through the focus adjustment setting step.

The focus adjustment setting step is a step of selecting a subject with a distant focus position by adjusting a position of a focus lens of the surveillance camera: Pan and tilt of the surveillance camera so that the selected subject is at the center of the image. Controlling; And setting a size of a focus window area to acquire focus data of the selected subject at a first zoom factor, which is a zoom factor requiring adjustment.

Alternatively, the setting of the focus adjustment may include selecting a subject having a specific focus position and calculating a distance to the selected subject; Controlling pan and tilt of the surveillance camera so that the selected subject is at the center of the image; And acquiring focus data of a scene including the selected subject at a first zoom factor, which is a zoom factor requiring adjustment, using a curve graph of the sensed distance to the subject and locus data.

The subject having the far focal position may be a subject whose distance corresponds to infinity in a curve graph of locus data.

Selecting the subject may include adjusting a zoom lens of the surveillance camera to have a preset specific zoom magnification; Moving the focus lens from near to far; And checking a specific window area having the farthest focal position among the frame images divided into a plurality of window areas, and selecting a distant subject within the specific window area.

The focus adjustment setting step may include setting the aperture of the surveillance camera to be opened to the maximum at a first zoom factor, which is a zoom factor requiring adjustment; And determining that the automatic exposure (AE) function of the surveillance camera is stably performed after the aperture is opened to the maximum.

According to such an embodiment of the present invention, by providing a separate environment for performing focus adjustment of the lens, that is, an environment for performing focus adjustment of the lens in a state where a surveillance camera is installed without a collimator device, separation of the surveillance camera And focus adjustment of the lens at the installed position without re-installation.

1 is a block diagram schematically showing the configuration of a surveillance camera according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a change in depth of a subject according to an opening degree of an aperture shown in FIG. 1;
3 is a graph showing an example of locus data according to a zoom lens, a focus lens, and a subject distance.
4 is a flowchart illustrating a method of adjusting lens focus of a surveillance camera according to an embodiment of the present invention.
5 is a flowchart illustrating a method of adjusting lens focus of a surveillance camera according to another embodiment of the present invention.

The content described in the technology column that serves as the background of the present invention is only intended to help understanding the background art of the technical idea of the present invention, and therefore it can be understood as the content corresponding to the prior art known to those skilled in the art. none.

In the description below, for purposes of explanation, many specific details are presented to aid in understanding the various embodiments. However, it is obvious that various embodiments may be practiced without these specific details or in one or more equivalent manners. In other instances, well-known structures and devices are shown in block diagrams in order to avoid unnecessarily obscuring the various embodiments of the device.

Each block in the attached block diagram may be executed by computer program instructions (execution engine), and these computer program instructions may be mounted on a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment. The instructions, executed by the processor of other programmable data processing equipment, generate means for performing the functions described in each block of the block diagram.

These computer program instructions can also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular way, so that the computer-usable or computer-readable memory It is also possible to produce an article of manufacture in which the instructions stored in the block diagram contain instruction means that perform the functions described in each block of the block diagram.

In addition, since the computer program instructions may be mounted on a computer or other programmable data processing equipment, a series of operation steps are performed on a computer or other programmable data processing equipment to create a process that is executed by a computer, It is also possible for the instructions to perform the possible data processing equipment to provide a function to perform the functions described in each block of the block diagram.

In addition, each block may represent a module, segment, or part of code including one or more executable instructions for executing specified logical functions, and in some alternative embodiments, the functions mentioned in the blocks or steps are ordered. It is also possible to occur outside of.

That is, the two illustrated blocks may actually be executed at the same time, and the blocks may be executed in the reverse order of corresponding functions as needed.

The terms used herein are for the purpose of describing specific embodiments and not for the purpose of limiting. Throughout the specification, when a certain part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary. Unless otherwise defined, terms used herein have the same meaning as commonly understood by those of ordinary skill in the field to which the present invention belongs.

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

1 is a block diagram schematically showing the configuration of a surveillance camera according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a change in depth of a subject according to an opening degree of an aperture of FIG. 1, and FIG. 3 is a graph illustrating an example of locus data according to a zoom lens, a focus lens, and a subject distance.

Referring to FIG. 1, the surveillance camera 100 includes a lens unit 110, a lens driver 120, an image pickup device 130, an image processing module 140, and a focus adjustment setting unit 150.

In addition, the surveillance camera 100 according to an embodiment of the present invention may additionally include a distance sensor 110a capable of measuring a distance to a subject, and in this case, the distance sensor 110a may include LRF, radar, and ultrasonic waves. It can be implemented with a distance sensor or the like.

The lens unit 110 is a Varifocal lens and includes a zoom lens 112 and a focus lens 114, and a stop 116 for adjusting an amount of incident light incident on the lens.

The lens driving unit 120 may perform an operation of driving the lens unit 100 and driving a pan and a tilt of the camera according to a predetermined control signal. In the embodiment of the present invention, the lens driving unit 120 may include a zoom driving unit 122, a focus driving unit 124, an aperture driving unit 126, and a P/T driving unit 128. In this case, each of the driving units 120, 122, 124, and 126 may include a driving element such as a motor, and as an example of an external control signal, the image processing module 140 and/or the focus adjustment setting unit 150 ), the zoom lens 112, the focus lens 114, and the iris 116 may be operated according to the control signal output from ), and pan and tilt driving of the camera may be performed.

As an example, the aperture 116 may automatically adjust the opening amount to adjust the amount of incident light including the subject, and the aperture driver 126 may adjust the opening amount of the aperture 116 according to the input aperture control signal. Can be adjusted. The opening amount of the iris 116 is adjusted by the operation of the iris driving unit 126, so when the surrounding is bright, such as during the daytime, the opening amount of the iris 116 is reduced to reduce the amount of incident light, and when the surrounding is dark, such as at night. In this, the opening amount of the diaphragm 116 is increased to increase the amount of incident light so that a bright image can be captured.

In addition, the positions of the zoom lens 112 and the focus lens 114 are controlled by the zoom driving unit 122 and the focus driving unit 124, respectively. For example, when a wide angle-zoom (zoom-out) signal is generated, the focal length of the zoom lens 112 is shortened to widen the angle of view, and telephoto-zoom (zoom-in) When a signal is generated, the focal length of the zoom lens 112 may be increased, so that the angle of view may be narrowed.

The optical signal incident on the lens unit 110 of the surveillance camera 100 passes through the zoom lens 112 and the focus lens 114 and then reaches the light-receiving surface of the imaging device 130 to form an image of the subject. An image formed on the light-receiving surface of the image pickup device 130 is converted into an electrical image signal by photoelectric conversion processing.

As the image pickup device 130, a charge coupled device (CCD) or a complementary metal oxide semiconductor image sensor (CMOS) that converts an optical signal into an electrical signal may be used. The imaging device 130 as a CMOS has a great advantage in maintaining the power of the surveillance camera 00 because the power consumption required for shooting is low, and the manufacturing cost is relatively inexpensive, so it is advantageous to make the area of the imaging device large, and mass production is easy. Do. On the other hand, the image pickup device 130 as a CCD has the advantage that noise generation is much less than that of CMOS and the image information transmission speed is very fast, so that the storage speed is fast during continuous shooting, and the image quality is excellent.

Thereafter, the image signal output from the imaging device 130 is input to the image processing module 140 to perform various image processing. The video signal subjected to such processing may be temporarily stored in the surveillance camera 100 and then transmitted to a digital video recorder or a network video recorder. For example, the image processing module 140 may include auto white balance, auto exposure (AE), auto focus (AF), gamma correction (auto white balance), auto exposure (AE), auto focus (AF), and gamma correction ( The image quality can be improved by performing signal processing such as Gamma Correction), and an image signal of improved quality can be output. In this case, in performing the auto focus (AF) operation, the image processing module 140 divides one frame into a plurality of window regions without using the entire input image signal, and AF may be performed by selecting a specific window and using only an image signal corresponding to the window area. The selected specific window may be implemented as one single window or a plurality of multiple windows.

In addition, the image processing module 140 may include a digital signal processing unit (not shown), through which color filter array interpolation, color matrix, color correction, Image processing such as color enhancement can be performed.

On the other hand, the range of the distance to the position of the subject where the actual image appears by the lens is called the subject depth, which may vary according to the opening amount of the aperture 116. That is, when the opening amount of the iris 116 is small, the depth of the subject becomes deep (the range of the depth of focus is large) due to the pinhole effect of the iris 116, and when the opening amount of the iris 116 is large, the depth of the subject becomes shallow. (The range of the depth of focus is small). This principle can be more easily understood with reference to FIG. 2. Referring to FIG. 2, the distance from the surveillance camera 100 is represented by d(-), n(-), n(+) and d(+) in the order of the nearest point to the far point, and the subject A is It is shown to be located between n(-) and n(+).

When the aperture 116 of the surveillance camera 100 has a small opening amount, the depth of the subject becomes deeper from d(-) to d(+), so that the subject A is positioned anywhere in the same section, the focus is seen, and the aperture ( When the opening amount of 116) is large, the depth of the subject becomes shallow from n(-) to n(+), and focus is achieved only when the subject A is positioned within a short section within the same section.

Therefore, when the focus of the lens unit 110 is adjusted as the subject depth is between n(-) and n(+), it is possible to shoot clear images in both daytime and nighttime regardless of the external environment in which the amount of incident light changes. I can.

3 is a graph showing an example of locus data according to a zoom lens, a focus lens, and a subject distance. In other words, FIG. 3 shows the position of the zoom lens and the position of the focus lens that is in focus corresponding to the distance of the subject and the position of the zoom lens on a curve graph having three pieces of information: a zoom step, a focus step, and a distance of the subject. In other words, it is an index indicating the focus step. Referring to FIG. 3, the x-axis represents the position of the zoom lens 112 and the y-axis represents the position of the focus lens 114. In the x-axis, the wide direction is the direction to zoom out, the origin of the wide direction indicates the state that no zoom is used, and the tele direction is the direction to zoom in, bringing a distant subject closer. It indicates the direction of movement of the zoom lens to look as if it were.

As shown in FIG. 3, different curves appear in the locus data according to the distance to the subject. 3 shows an example in which the distance to the subject is 3m, 5m, and infinity, respectively. However, the focus data determined during the design of the lens module may have an error from the initially designed value after the surveillance camera to which the lens module is applied is assembled.

In the case of a surveillance camera equipped with a varifocal lens, if a mechanical defect occurs in which the focus is shifted, a collimator after separating the module from the surveillance camera to adjust the focus of the lens to correct the mechanical defect. ), the focus adjustment is performed in a device or space that provides a special environment such as ), and after the adjustment is completed, the module must be reassembled and then the surveillance camera must be re-installed at the initial position.

In order to overcome these drawbacks, a method for adjusting lens focus of a surveillance camera according to an embodiment of the present invention is a method for adjusting lens focus of a surveillance camera to which a variable focus lens is applied, in a separate environment for performing lens focus adjustment, that is, a collimator Collimator) is characterized in that the environment in which the lens focus adjustment is performed in the state where the surveillance camera is installed, that is, the focus adjustment setting mode can be implemented by itself, and according to the embodiment of the present invention, in the place where the surveillance camera is installed Since the lens focus adjustment can be performed, it is not necessary to remove and reinstall the camera module, and a device that provides a special environment such as a collimator is not required, so problems occurring in each process can be solved.

That is, the surveillance camera 100 according to an embodiment of the present invention is characterized in that it includes a focus adjustment setting unit 150 that performs this function.

More specifically, in the lens focus adjustment setting mode performed by the focus adjustment setting unit 150 according to an embodiment of the present invention, during the focus adjustment, that is, during the focus adjustment mode, the exposure and distance of the subject Performs the operation of setting the environment so that (Distance) can be kept constant.

The exposure of the surveillance camera may be affected by operations such as the aperture 116 and the shutter (not shown). In particular, the difference between the position at which the change of the aperture 116 is focused and the focus depth Since it is generated, the control of the aperture is a major factor. For example, as described above with reference to FIG. 2, when the aperture 116 is fully opened, the depth of focus becomes shallow and more precise focus adjustment is possible, so the focus adjustment setting unit 150 according to the embodiment of the present invention uses this The setting mode for lens focus adjustment can be set.

In addition, since the distance of the subject affects the depth of field (Filed Depth), the focus adjustment setting unit 150 according to the exemplary embodiment of the present invention uses the characteristic that the depth of the subject increases as the distance increases, in the graph shown in FIG. When the distance to the subject is infinite, a setting mode for lens focus adjustment may be set by selecting a subject corresponding to the subject.

FIG. 4 is a flowchart illustrating a method of adjusting lens focus of a surveillance camera according to an embodiment of the present invention. Hereinafter, a detailed method of adjusting lens focus of a surveillance camera will be described with reference to FIGS. 1 to 4.

A method for adjusting lens focus of a surveillance camera according to an embodiment of the present invention includes a lens focus in a state where a surveillance camera is installed without a separate environment (for example, a collimator device) for adjusting the lens focus for a variable focus lens. It is characterized in that the monitoring camera itself implements the environment in which the adjustment is performed, that is, the focus adjustment setting mode without removing and reinstalling the monitoring camera.

The focus adjustment setting mode is an operation previously performed by the focus adjustment setting unit 150 shown in FIG. 1, which is, during the subsequent adjustment of the lens focus of the surveillance camera, that is, during the focus adjustment mode, exposure ) And optimally setting the distance of the subject.

In the method for adjusting lens focus of a surveillance camera according to an embodiment of the present invention, in performing the focus adjustment setting mode, the degree of opening of the aperture is adjusted so that the light exposure and the distance of the subject are kept constant. It is characterized in that the subject is controlled, and the subject having the farthest focal position is identified and selected.

More specifically, a method of adjusting lens focus of a surveillance camera according to an embodiment of the present invention will be described as follows.

Referring to FIG. 4, first, in selecting a scene including a subject for lens focus adjustment by adjusting a position of a focus lens of the surveillance camera, a subject having a distant focus position is selected. (Step 1: S400)

That is, when the aforementioned distance of the subject is uniformly optimally set, the subject with the farthest focal position is checked at a preset specific zoom magnification (e.g., 2x), and the subject is You can select a scene that contains. Since the distance of the subject affects the field depth, the embodiment of the present invention uses the characteristic that the depth of the subject increases as the distance increases, and corresponds to the case where the distance to the subject is infinite in the graph shown in FIG. You can select the subject.

In addition, in selecting the scene, according to an embodiment of the present invention, a scene corresponding to a specific window area may be selected for a frame screen divided into a plurality of window areas without using the entire input image signal. The selected specific window may be implemented as one single window or a plurality of multiple windows.

More specifically, methods for selecting a predetermined scene at the specific zoom magnification include an automatic mode method and a manual mode method. For example, in the automatic mode method, after moving to the specific zoom magnification from a position in which the pan and tilt of the current surveillance camera are maintained, the focus lens 114 is moved from the y-axis of the graph of FIG. By controlling the focus driving unit 124 to move from (near) to a circle (far), a specific window area having the farthest focal position among the plurality of window areas is identified, and finally the farthest (Fig. 3) Infinity) can be selected.

In another embodiment, the manual mode method may select a specific window including a distant (infinity) subject as a reference for adjusting the focus by the user at the specific zoom magnification.

Next, pan and tilt of the surveillance camera are controlled so that the subject of the selected scene is at the center of the image. (Step 2: S410)

As shown in FIG. 1 above, the P/T driving unit 128 of the monitoring camera 100 according to an embodiment of the present invention uses a pan of the monitoring camera by a control signal output from the focus adjustment setting unit 150. ) And tilt to adjust the lens position of the surveillance camera so that the subject of the selected scene is at the center of the image.

Next, a size of a focus window is set in order to acquire focus data of a scene including the selected subject at a first zoom factor, which is a zoom factor requiring adjustment. (3rd step: S420)

At this time, the first zoom magnification may be a specific zoom magnification (e.g., 2 magnification) previously used when selecting a subject with a distant focal position, but the first zoom magnification is the actual monitoring camera 100 monitoring the surrounding environment. It may be a zoom magnification that is mainly used when doing this. As an example, when the specific zoom magnification and the first zoom magnification are different from each other, a window area including a subject selected based on the specific zoom magnification may be changed by changing to the first zoom magnification. That is, in order to acquire focus data of a scene including the selected subject at the first zoom magnification, a size of a focus window corresponding to a preset window area may be set.

The first to third steps correspond to a step of setting an optimal environment in which a distance of a subject is kept constant in the focus adjustment setting mode according to an embodiment of the present invention. Thereafter, a step of optimally setting light exposure in the focus adjustment setting mode is performed.

More specifically, the aperture 116 is set to be opened to the maximum at the first zoom magnification. (Step 4: S430)

As shown in FIG. 1 above, the aperture driving unit 126 of the surveillance camera 100 according to an embodiment of the present invention controls the aperture 116 of the surveillance camera by a control signal output from the focus adjustment setting unit 150. The degree of opening can be controlled.

In the case of the embodiment of the present invention, as described in detail with reference to FIG. 2 above, when the aperture 116 is opened to the maximum, the depth of focus becomes shallow, so that more precise focus adjustment is possible.

Accordingly, according to an embodiment of the present invention, after controlling the PT so that a subject with a distant focal position is selected through the first to third steps and a specific window area corresponding to the scene including the same is positioned at the center of the image, Similarly, an environment can be set to make the depth of focus shallower by opening the aperture to the maximum.

However, if the aperture is opened to the maximum in this way, the automatic exposure (AE) function of the surveillance camera may not be stably performed, so whether the automatic exposure (AE) function of the surveillance camera is stably performed after the fourth step. The determining step may be performed. (Step 5: S440)

At this time, if it is determined that the automatic exposure (AE) function of the surveillance camera is not stably performed, the first step may be returned to reselect a scene including the distant subject.

On the other hand, if it is determined that the automatic exposure (AE) function of the surveillance camera is stably performed, the focus adjustment setting mode according to the embodiment of the present invention is completed.

Accordingly, when the focus adjustment setting mode, that is, the first step (S400) to the fifth step (S440) is performed, a lens focus adjustment operation according to a general lens focus adjustment mode is performed. (6th step: S450)

In the embodiment of the present invention shown in FIG. 3, the step of optimally setting the light exposure (step 4 and step 5) in the focus adjustment setting mode is performed in which the distance of the subject is kept constant. As an example, what is performed after the step of setting the optimal environment (steps 1 to 3) has been described as an example, but this is only an example, and the embodiment of the present invention is not limited thereto. That is, the fourth and fifth steps may be performed prior to the first to third steps, or may be performed in the middle of the first to third steps.

5 is a flow chart illustrating a method of adjusting lens focus of a surveillance camera according to another embodiment of the present invention. Hereinafter, the lens focus of a surveillance camera according to another embodiment of the present invention with reference to FIGS. 1 to 3 and 5 Explain how to adjust.

The method for adjusting the lens focus of the surveillance camera illustrated in FIG. 5 includes the steps of setting an optimal environment in which the distance of the subject is kept constant as compared to the method for adjusting the lens focus described with reference to FIG. 4 above (first to There is a difference in that step 3) changes.

More specifically, the embodiment shown in FIG. 5 measures the distance of a subject through the distance sensor 110a shown in FIG. 1, unlike the embodiment shown in FIG. 4, and the distance to the subject and the distance shown in FIG. Using the locus data, it is possible to acquire focus data at a zoom magnification (first zoom magnification) requiring immediate adjustment. That is, the distance sensor 110a is operated under the control of the focus adjustment setting unit 150 according to an exemplary embodiment of the present invention to sense the distance to the selected subject.

Therefore, in the method of adjusting the lens focus of the surveillance camera shown in FIG. 5, after selecting a subject capable of measuring distance and calculating the distance to the subject (first step: S500), the subject of the selected scene is at the center of the image. Control the pan and tilt of the surveillance camera so that it comes (second step: S510), and the first zoom magnification that needs to be adjusted using the distance to the sensed subject and the locus data shown in FIG. At zoom magnification, focus data of a scene including the selected subject is acquired. (3rd step: S520)

The subsequent steps correspond to the step of optimally setting the light exposure in the focus adjustment setting mode in the same manner as in the fourth and fifth steps S430 and S440 of FIG. 4, and the aperture at the first zoom magnification. The step of setting 116 to be opened to the maximum (step 4: S530), and determining whether the automatic exposure (AE) function of the surveillance camera is stably performed after the fourth step may be performed. (Step 5: S540)

At this time, if it is determined that the automatic exposure (AE) function of the surveillance camera is not stably performed, the first step may be returned to reselect a scene including the distant subject.

On the other hand, if it is determined that the automatic exposure (AE) function of the surveillance camera is stably performed, the lens focus adjustment setting mode according to an embodiment of the present invention is completed.

Accordingly, when the focus adjustment setting mode, that is, the first step (S400) to the fifth step (S440) is performed, a lens focus adjustment operation according to a general lens focus adjustment mode is performed. (6th step: S450)

The embodiment illustrated in FIG. 5 has also been described as an example that the step of optimally setting the light exposure (step 4 and step 5) is performed later, but this is only one embodiment and the implementation of the present invention The example is not limited thereto. That is, the fourth and fifth steps may be performed prior to the first to third steps, or may be performed in the middle of the first to third steps.

According to the lens focus adjustment method of the surveillance camera according to the embodiment of the present invention, the lens focus adjustment is performed while the surveillance camera is installed without a separate environment (eg, a collimator) for performing the lens focus adjustment. By self-implementing the environmental focus adjustment setting mode (steps 1 to 5: S400 (500) to S440 (540)), since it is possible to perform lens focus adjustment at the place where the surveillance camera is installed, the surveillance camera is separated and Lens focus adjustment can be performed in the installed position without reinstallation.

As described above, in the present invention, specific matters such as specific components, etc., and limited embodiments and drawings have been described, but this is provided only to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , If a person of ordinary skill in the field to which the present invention belongs, various modifications and variations are possible from these descriptions.

Therefore, the spirit of the present invention is limited to the described embodiments and should not be defined, and all things that are equivalent or equivalent to the claims as well as the claims to be described later fall within the scope of the spirit of the present invention. .

Claims (6)

In the lens focus adjustment method of a surveillance camera applying a variable focus lens,
A focus adjustment setting step of setting an environment for performing focus adjustment of a lens at a position where the surveillance camera is installed without removing and reinstalling the surveillance camera;
And performing focus adjustment of the variable focus lens at a location where the surveillance camera is installed based on an environment set through the focus adjustment setting step. The method of claim 1,
The focus adjustment setting step,
Selecting a subject having a distant focus position by adjusting the position of the focus lens of the surveillance camera:
Controlling pan and tilt of the surveillance camera so that the selected subject is at the center of the image; And
And setting a size of a focus window area to acquire focus data of the selected subject at a first zoom factor that is a zoom factor requiring adjustment. The method of claim 1,
The focus adjustment setting step,
Selecting a subject having a specific focus position, and calculating a distance to the selected subject;
Controlling pan and tilt of the surveillance camera so that the selected subject is at the center of the image; And
Lens focus adjustment of a surveillance camera comprising the step of acquiring focus data of a scene including the selected subject at a first zoom factor that is a zoom factor requiring adjustment using a curve graph of the sensed distance to the subject and locus data Way. The method of claim 2,
The lens focus adjustment method of a surveillance camera, wherein the subject having the far-field focal position is a subject whose distance corresponds to infinity in a curve graph of locus data. The method of claim 2,
The step of selecting the subject,
Adjusting the zoom lens of the surveillance camera to have a preset specific zoom magnification;
Moving the focus lens from near to far; And
A method for adjusting lens focus of a surveillance camera, comprising the steps of checking a specific window area having a most distant focal position among frame images divided into a plurality of window areas, and selecting a distant subject within the specific window area. The method of claim 1,
The focus adjustment setting step,
Setting the aperture of the surveillance camera to be opened to the maximum at a first zoom factor, which is a zoom factor requiring adjustment; And
And determining that the automatic exposure (AE) function of the surveillance camera is stably performed after the aperture is opened to the maximum.

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