WO2020114130A1

WO2020114130A1 - Camera adjustment method

Info

Publication number: WO2020114130A1
Application number: PCT/CN2019/112665
Authority: WO
Inventors: 刘若鹏; 栾琳; 季春霖
Original assignee: 西安光启未来技术研究院
Priority date: 2018-12-06
Filing date: 2019-10-23
Publication date: 2020-06-11
Also published as: CN111294501B; CN111294501A

Abstract

Disclosed is a camera adjustment method. A camera is installed on a fixing apparatus. The adjustment method comprises: adjusting the inclination angle of a camera, such that an included angle between an upper edge line of a field of view of the camera and a horizontal plane is within a pre-set angle range; adjusting the installation height of the camera on the fixing apparatus to a pre-set height; and adjusting the focal length of the camera to change the angle of the field of view of the camera, such that a monitoring range of the camera is a pre-set monitoring range, wherein the pre-set monitoring range is associated with the pre-set height. According to the embodiments of the present invention, by means of making an included angle between an upper edge line of a field of view of a camera and a horizontal plane be within a pre-set angle range, for example, making the upper edge line of the field of view of the camera be parallel to the horizontal plane, it is ensured that a monitoring camera has a wider monitoring range.

Description

Method for adjusting camera

Technical field

The invention relates to the field of camera monitoring, and in particular to a camera adjustment method.

Background technique

Surveillance cameras are quasi-cameras used in security. Its pixels and resolution are higher than computer video heads and lower than professional digital cameras or dvs. Surveillance cameras are mostly single video capture devices and rarely have data storage functions. . Surveillance cameras are mainly divided into gun type, hemisphere, and high-speed dome in appearance. In addition, there are analog monitoring and IP network monitoring. They are widely used in many security fields such as schools, companies, banks, transportation, and safe cities.

technical problem

When the existing surveillance camera is installed on a support such as a mounting post, the usual adjustment method is to adjust the situation with the surveillance camera turned on. When the field of view of the surveillance camera reaches a satisfactory range, the surveillance camera is fixed. The process of this adjustment method is very complicated, consumes a lot of time, manpower and material resources, and is extremely uneconomical.

In addition, in general camera installation, in order to be able to monitor the area at close range, the optical axis of the surveillance camera is usually tilted down more, which results in a smaller surveillance distance range of the camera, generally less than 100 meters. In this case, it is necessary to install more cameras in a fixed area to ensure full coverage of the monitoring area, which increases the hardware cost and also increases the background computing pressure.

Technical solution

At least one technical problem to be solved by the embodiment of the present invention is: how to make the camera have a larger monitoring range.

In order to solve the above technical problems, an embodiment of the present invention provides a camera adjustment method, the camera is installed on a fixing device; the adjustment method includes:

Adjusting the tilt angle of the camera so that the angle between the upper edge of the field of view of the camera and the horizontal plane is within a preset angle range;

Adjust the installation height of the camera on the fixed device to the preset height;

The focal length of the camera is adjusted to change the angle of view of the camera, so that the monitoring range of the camera is a preset monitoring range; wherein the preset monitoring range is associated with a preset height.

Further, in the above adjustment method, the step of adjusting the tilt angle of the camera so that the angle between the upper edge of the field of view of the camera and the horizontal plane is within a preset angle range includes:

Adjust the tilt angle of the camera so that the edge line on the field of view of the camera is parallel to the horizontal plane.

Further, in the above adjustment method, the vertical monitoring distance in the preset monitoring range is equal to the preset height.

Further, in the above adjustment method, the horizontal monitoring distance in the preset monitoring range is 0 meters to 200 meters or 0 meters to 250 meters.

Further, in the above adjustment method, the preset angle range is 0 degrees to 5 degrees; or

The preset angle range is 0 degrees to 10 degrees; or

The preset angle range is 0 degrees to 15 degrees; or

The preset angle range is 0 degrees to 20 degrees.

Further, in the above adjustment method, the angle between the upper edge of the field of view of the camera and the lower edge of the field of view is the angle of view.

Further, in the above adjustment method, the focal length of the camera is inversely proportional to the angle of view.

Further, in the above adjustment method, the camera is a gun camera, a hemisphere camera, or a high-speed dome camera.

Further, in the above adjustment method, the camera has 5 million to 11 million pixels.

Further, in the above adjustment method, the step of adjusting the installation height of the camera on the fixing device to a preset height includes:

The installation height of the camera on the fixing device is adjusted to a preset height through a height adjustment device in a manual or automatic adjustment manner.

Further, in the above adjustment method, the step of adjusting the tilt angle of the camera relative to the fixing device so that the angle between the edge line of the field of view of the camera and the horizontal plane is within a preset angle range includes:

The tilt angle of the camera is adjusted manually or automatically by the tilt angle adjusting device, so that the angle between the edge line on the field of view of the camera and the horizontal plane is within a preset angle range.

Further, in the above adjustment method, the tilt angle of the camera is the angle between the optical axis of the camera and the horizontal plane.

Beneficial effect

The embodiment of the present invention makes the installation of the camera more convenient through the installation of the camera and the above adjustment method, and by making the angle between the upper edge of the field of view of the camera and the horizontal plane within a preset angle range, for example, the upper edge of the field of view of the camera The line is parallel to the horizontal plane; thus ensuring that the surveillance camera has a larger surveillance range.

BRIEF DESCRIPTION

FIG. 1 is a flowchart of a camera adjustment method according to an embodiment of the present invention.

2 is a schematic diagram of the installation of a camera according to an embodiment of the present invention.

3 is a schematic diagram of the connection relationship between the camera, the height adjustment device, and the tilt angle adjustment device according to an embodiment of the present invention.

Embodiments of the invention

The embodiment of the present invention makes the installation of the camera easier and the camera has a larger monitoring range through the installation and adjustment of the camera. In order to explain in detail the technical content, structural features, achieved goals and effects of the technical solution, the following detailed description will be given in conjunction with specific embodiments and drawings.

FIG. 1 is a flowchart of an adjustment method 100 of a camera 10 according to an embodiment of the present invention. 2 is a schematic diagram of the installation of the camera 10 according to an embodiment of the present invention. Please refer to FIGS. 1 and 2 at the same time. The camera 10 is mounted on the fixing device 20. As a non-limiting example, the fixing device 20 may be, for example, a bracket or a fixing rod, a street lamp post, or the like.

In the embodiment of the present invention, the camera 10 is a gun camera, a hemisphere camera, or a high-speed dome camera, or the like.

In the embodiment of the present invention, the higher the pixels of the camera 10, the better the monitoring effect (that is, the wider the monitoring range); for example, the pixels of the camera 10 may be 20 million pixels, but the cost will increase. In a preferred embodiment of the present invention, the camera 10 has 5 million to 11 million pixels.

The adjustment method 100 includes step 102, step 104, and step 106.

Step 102: Adjust the tilt angle of the camera 10 so that the angle between the upper edge of the field of view of the camera 10 and the horizontal plane 900 is within a preset angle range. In a non-limiting embodiment, the tilt angle θ of the camera 10 is the angle between the optical axis 12 of the camera 10 and the horizontal plane 900. In the embodiment of the present invention, the preset angle range is 0 degrees to 5 degrees; or the preset angle range is 0 degrees to 10 degrees; or the preset angle range is 0 degrees to 15 degrees; or The preset angle range is 0 degrees to 20 degrees.

Step 104: Adjust the installation height of the camera 10 on the fixing device 20 to a preset height.

Step 106: Adjust the focal length of the camera 10 to change the angle of view of the camera 10, so that the monitoring range of the camera 10 is a preset monitoring range; wherein the preset monitoring range is associated with a preset height. In the embodiment of the present invention, the horizontal monitoring distance in the preset monitoring range is 0 meters to 200 meters or 0 meters to 250 meters.

Optionally, in other embodiments, the execution order of step 102 and step 104 may be reversed.

When the image height h (also referred to as the image field diameter h) is constant, the relationship between the field of view angle and focal length of the camera 10 can be obtained from the following formula 1, that is, the focal length and field angle of the camera 10 Inversely proportional.

fov=2arctan ((h/2)/f)..... Formula 1

Where, fov is the angle of view of the camera 10, and f is the focal length of the camera 10. Therefore, when the focal length f of the camera 10 increases, the field angle fov of the camera 10 decreases; when the focal length f of the camera 10 decreases, the field angle fov of the camera 10 increases.

In a specific embodiment of the present invention, in step 102, the step of adjusting the tilt angle of the camera 10 so that the angle between the upper edge of the field of view of the camera 10 and the horizontal plane 900 is within a preset angle range includes: Adjust the tilt angle of the camera 10 so that the upper edge of the field of view of the camera 10 is parallel to the horizontal plane 900, wherein the angle between the upper edge of the field of view of the camera 10 and the lower edge of the field of view is the angle of view fov.

In the case where the upper edge of the field of view of the camera 10 is parallel to the horizontal plane 900, the vertical monitoring distance Y in the preset monitoring range is equal to the preset height, and the horizontal monitoring distance X in the preset monitoring range can be performed by Equation 2 below Calculation.

Where, fov is the angle of view of the camera 10; distance is the horizontal monitoring distance X, and width is the vertical monitoring distance Y.

It should be noted here that the monitoring range of the camera is directly related to its viewing angle and installation height. The larger the viewing angle, the larger the monitoring range (the far point is infinite, and the near point increases with the viewing angle. The distance from the camera becomes smaller); the greater the installation height of the camera, the greater the monitoring range (the far point is infinite, and the distance from the camera to the camera becomes larger as the installation height becomes larger).

Because the upper edge of the camera's field of view angle is parallel to the horizontal plane in the embodiment of the present invention, the far point of the monitoring range is infinity, so when setting the monitoring distance range, only the near point needs to be considered, and the near point is The angle of view parameters of the camera itself (the angle of view parameters of each camera are fixed and known) and the installation height, therefore, the only parameter that needs to be determined is the installation height, which can be calculated according to simple mathematical operations, such as through the above The formula 2 described can be calculated.

Therefore, when installing the camera, you only need to select the appropriate camera and installation height according to the calculation results, without adjusting while monitoring and debugging, which greatly saves installation time, manpower and material resources.

Moreover, because the monitoring remote point is infinity, a camera with a larger number of pixels can be selected, which can expand the monitoring range and reduce the number of cameras installed in a fixed area. For example, in this embodiment, a camera with 5 million to 11 million pixels may be installed, and the far point of the horizontal monitoring range may be expanded to 200-250 meters.

3 is a schematic diagram of the connection relationship between the camera 10, the height adjustment device 80, and the tilt angle adjustment device 82 according to an embodiment of the present invention. Referring to FIG. 3, the camera 10 is connected to a height adjustment device 80 and a tilt angle adjustment device 82. Among them, the height adjustment device 80 and the tilt angle adjustment device 82 may also be installed on the fixing device 20 shown in FIG. 1, and both are connected to the camera 10.

In this way, the installation height of the camera 10 on the fixing device 20 can be adjusted to a preset height by the height adjustment device 80 in a manual or automatic adjustment manner. The tilt angle of the camera 10 may also be adjusted manually or automatically by the tilt angle adjusting device 82 so that the angle between the upper edge of the field of view of the camera 10 and the horizontal plane 900 is within a preset angle range.

In the embodiment of the present invention, the height adjusting device 80 may use a known height adjusting device in the art to adjust the installation height of the camera, which will not be repeated here. Similarly, the tilt angle adjusting device 82 also uses a known tilt angle adjusting device in the art to adjust the tilt angle of the camera, which will not be repeated here.

Industrial applicability

It should be noted that the above are only the embodiments of the present invention, and those skilled in the art can make additional changes and modifications to these embodiments once they know the basic inventive concept of the present invention, so although in this article The above embodiments have been described, but it does not limit the scope of patent protection of the present invention. Any equivalent structure or equivalent process transformation made by the description and drawings of the present invention, or directly or indirectly used in other related In the technical field, the same reason is included in the patent protection scope of the present invention.

Claims

An adjustment method for a camera, the camera is mounted on a fixed device; characterized in that the adjustment method includes:

Adjusting the tilt angle of the camera so that the angle between the upper edge of the field of view of the camera and the horizontal plane is within a preset angle range;

Adjust the installation height of the camera on the fixed device to the preset height;

The focal length of the camera is adjusted to change the angle of view of the camera, so that the monitoring range of the camera is a preset monitoring range; wherein the preset monitoring range is associated with a preset height.
The adjustment method according to claim 1, wherein the step of adjusting the tilt angle of the camera so that the angle between the edge line on the field of view of the camera and the horizontal plane is within a preset angle range includes:

Adjust the tilt angle of the camera so that the edge line on the field of view of the camera is parallel to the horizontal plane.
The adjustment method according to claim 2, wherein the vertical monitoring distance in the preset monitoring range is equal to the preset height.
The adjusting method according to claim 1 or 2, wherein the horizontal monitoring distance in the preset monitoring range is 0 meters to 200 meters or 0 meters to 250 meters.
The adjustment method according to claim 1, wherein the preset angle range is 0 degrees to 5 degrees; or

The preset angle range is 0 degrees to 10 degrees; or

The preset angle range is 0 degrees to 15 degrees; or

The preset angle range is 0 degrees to 20 degrees.
The adjustment method according to claim 1, characterized in that the angle between the upper edge of the field of view of the camera and the lower edge of the field of view is the angle of view, and the focal length of the camera and the field of view The field angle is inversely proportional.
The adjustment method according to claim 1, wherein the camera is a gun camera, a hemisphere camera, or a high-speed dome camera.
The adjusting method according to claim 1, wherein the step of adjusting the installation height of the camera on the fixing device to a preset height includes:

The installation height of the camera on the fixing device is adjusted to a preset height through a height adjustment device in a manual or automatic adjustment manner.
The adjusting method according to claim 1, wherein the step of adjusting the tilt angle of the camera relative to the fixing device so that the angle between the edge line on the field of view of the camera and the horizontal plane is within a preset angle range includes :

The tilt angle of the camera is adjusted manually or automatically by the tilt angle adjusting device, so that the angle between the edge line on the field of view of the camera and the horizontal plane is within a preset angle range.
The adjustment method according to claim 1, wherein the tilt angle of the camera is the angle between the optical axis of the camera and the horizontal plane.