Focusing method and apparatus, cameras and camera system

Abstract

The invention discloses a focusing method and apparatus, a cameras and a camera system. The focusing method comprises the steps of acquiring preset position information; determining whether the preset position information is in a preset position database; if so, acquiring a latest recorded focus motor positional value corresponding to the preset position information from the preset position database; driving a focus motor to move to the focus motor positional value; triggering automatic focusing; acquiring a focus motor positional value after the automatic focusing is completed; determining whether the number of focus motor positioning values, corresponding to the preset position information, recorded in the preset position database is greater than or equal to a first threshold; if the number is greater than or equal to the first threshold, determining whether the positional difference is less than or equal to a second threshold; and if the positional difference is less than or equal to the second threshold, acquiring a focusing correct result. The invention has the advantages of high correct rate of preset position focusing adjustment, real-time update of historical data, quick acquisition of clear images.

Description

technical field

[0001] The invention relates to the field of cameras and video surveillance, in particular to a focusing method and device, a camera and a camera system. Background technique

[0002] The preset position refers to a camera with a pan / tilt that can realize zooming and focusing through the control of the zoom motor and the focus motor. The position value (zoom position) data is called a preset position, and the zoom position can also be called the magnification factor. Calling the preset position can make the camera gimbal move to the gimbal coordinate position immediately, and zoom to the specified magnification, namely The zoom motor moves to the zoom position.

[0003] Most cameras today have zoom and auto focus functions. Autofocus refers to driving the focus motor to move the focus lens group in the lens according to the acquired statistical information or phase difference information of the frame image to achieve the clearest imaging of the shooting tar...

Examples

Embodiment 1

[0058] This embodiment provides a focusing method, which can be applied, for example, to a camera with a pan / tilt that can realize zooming and focusing through zoom motor and focus motor control, such as figure 1 As shown, the focusing method includes the following steps:

[0059] S1. Obtaining the preset position information is generally obtained after the user issues a command to call the preset position. Preferably, the preset position information includes the pan-tilt horizontal angle value α, the pan-tilt vertical angle value β and the zoom position. After the gimbal obtains the horizontal angle value α and the vertical angle value β, it makes the camera point and rotate to the specified angle, and at the same time the zoom motor of the camera moves to the zoom position of the preset position.

[0060] S2. Judging whether the above preset position information exists in the preset position database. Preferably, the preset position database is stored in the form of a pres...

Embodiment 2

[0085] Corresponding to Embodiment 1, this embodiment provides a focusing device, such as image 3 shown, including:

[0086] A first acquisition unit 1, configured to acquire preset position information;

[0087] The first judging unit 2 is used to judge whether the preset position information exists in the preset position database;

[0088] The second obtaining unit 3 is used to obtain the focus motor position value corresponding to the preset position information and recorded last time from the preset position database when the preset position information exists in the preset position database;

[0089] The drive unit 4 is used to drive the focus motor to move to the position value of the focus motor;

[0090] A trigger unit 5 is used to trigger automatic focusing;

[0091] The third acquisition unit 6 is configured to acquire the position value of the focus motor after the auto-focus is completed;

[0092] The second judging unit 7 is used to judge whether the number o...

Embodiment 3

[0097] This embodiment provides a camera, such as Figure 4 As shown, the focus device 10 and the focus motor 20 of the above-mentioned embodiment 2 are included.

[0098] The focusing device 10 is used to acquire preset position information; judge whether the preset position information exists in the preset position database; when the preset position information exists in the preset position database, obtain and preset the preset position information from the preset position database The position value of the focus motor corresponding to the bit information and recorded last time; drive the focus motor to move to the position value of the focus motor; trigger auto-focus; obtain the position value of the focus motor after auto-focus is completed; Whether the number of focus motor position values ​​corresponding to the preset position information is greater than or equal to the first threshold; when greater than or equal to the first threshold, judge whether the position differ...

technical field

[0001] The invention relates to the field of cameras and video surveillance, in particular to a focusing method and device, a camera and a camera system. Background technique

[0002] The preset position refers to a camera with a pan / tilt that can realize zooming and focusing through the control of the zoom motor and the focus motor. The position value (zoom position) data is called a preset position, and the zoom position can also be called the magnification factor. Calling the preset position can make the camera gimbal move to the gimbal coordinate position immediately, and zoom to the specified magnification, namely The zoom motor moves to the zoom position.

[0003] Most cameras today have zoom and auto focus functions. Autofocus refers to driving the focus motor to move the focus lens group in the lens according to the acquired statistical information or phase difference information of the frame image to achieve the clearest imaging of the shooting tar...

Examples

Embodiment 1

[0058] This embodiment provides a focusing method, which can be applied, for example, to a camera with a pan / tilt that can realize zooming and focusing through zoom motor and focus motor control, such as figure 1 As shown, the focusing method includes the following steps:

[0059] S1. Obtaining the preset position information is generally obtained after the user issues a command to call the preset position. Preferably, the preset position information includes the pan-tilt horizontal angle value α, the pan-tilt vertical angle value β and the zoom position. After the gimbal obtains the horizontal angle value α and the vertical angle value β, it makes the camera point and rotate to the specified angle, and at the same time the zoom motor of the camera moves to the zoom position of the preset position.

[0060] S2. Judging whether the above preset position information exists in the preset position database. Preferably, the preset position database is stored in the form of a pres...

Embodiment 2

[0085] Corresponding to Embodiment 1, this embodiment provides a focusing device, such as image 3 shown, including:

[0086] A first acquisition unit 1, configured to acquire preset position information;

[0087] The first judging unit 2 is used to judge whether the preset position information exists in the preset position database;

[0088] The second obtaining unit 3 is used to obtain the focus motor position value corresponding to the preset position information and recorded last time from the preset position database when the preset position information exists in the preset position database;

[0089] The drive unit 4 is used to drive the focus motor to move to the position value of the focus motor;

[0090] A trigger unit 5 is used to trigger automatic focusing;

[0091] The third acquisition unit 6 is configured to acquire the position value of the focus motor after the auto-focus is completed;

[0092] The second judging unit 7 is used to judge whether the number o...

Embodiment 3

[0097] This embodiment provides a camera, such as Figure 4 As shown, the focus device 10 and the focus motor 20 of the above-mentioned embodiment 2 are included.

[0098] The focusing device 10 is used to acquire preset position information; judge whether the preset position information exists in the preset position database; when the preset position information exists in the preset position database, obtain and preset the preset position information from the preset position database The position value of the focus motor corresponding to the bit information and recorded last time; drive the focus motor to move to the position value of the focus motor; trigger auto-focus; obtain the position value of the focus motor after auto-focus is completed; Whether the number of focus motor position values ​​corresponding to the preset position information is greater than or equal to the first threshold; when greater than or equal to the first threshold, judge whether the position differ...

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