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Method, device and system for adjusting camera back focus

A camera and focusing method technology, applied in the field of camera focusing, can solve problems such as slow speed, and achieve the effect of improving efficiency

Active Publication Date: 2017-02-01
HANGZHOU HIKVISION DIGITAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a method, device and system for adjusting the back focus of the camera, so as to solve the problem of slow speed in the focus adjustment of the camera in the prior art

Method used

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  • Method, device and system for adjusting camera back focus
  • Method, device and system for adjusting camera back focus
  • Method, device and system for adjusting camera back focus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the embodiment of the present invention, a method embodiment of a method for adjusting the back focus of a camera is provided.

[0024] The embodiment of the present invention also provides a method for adjusting the back focus of the camera. This method can be implemented by a camera back focus adjustment device, but it is not limited to this.

[0025] figure 1 It is a schematic flowchart of a method for adjusting the back focus of a camera according to the first embodiment of the present invention. Such as figure 1 As shown, the method includes the following steps:

[0026] Step S101, in the process of the stepping motor driving the image sensor to move in the preset direction according to the first preset number of steps, acquiring multiple frames of images collected by the image sensor;

[0027] In the above step S101, when the automatic back focus adjustment trigger button is pressed, the image sensor will be driven by the stepping motor to move in a preset d...

Embodiment approach

[0038] In a preferred embodiment, the method for adjusting the back focus of the camera further includes the following steps:

[0039] Step S110, when the rate of change of the sharpness evaluation value is less than the first threshold, the stepping motor drives the image sensor to move to the initial focus position;

[0040] In the above step S110, when the rate of change of the calculated definition evaluation value is less than the first threshold, it can be judged that the current camera movement direction is wrong. At this time, a stepping motor is required to drive the image sensor back to the initial focus position, or drive A geared moving device drives the image sensor back to the initial focus position.

[0041] Step S111, driving the image sensor to move from the initial focusing position in a direction opposite to the preset direction according to the first preset number of steps;

[0042] In the above step S111, at this time, the image sensor will start from the initial ...

Embodiment 2

[0111] Figure 5 It is a schematic structural diagram of a device for adjusting the back focus of a camera according to the second embodiment of the present invention. For the purpose of description, the drawn architecture is only an example of a suitable environment, and does not impose any limitation on the scope or function of the application. Nor should the camera's back focus adjustment device be Figure 5 Any component or combination shown has any dependencies or requirements.

[0112] Such as Figure 5 As shown, the device for adjusting the back focus of the camera may include: a first acquisition module 51, a first calculation module 53, a second calculation module 55, a first processing module 57, and a first judgment module 59.

[0113] Wherein, the first acquisition module 51 is configured to acquire multiple frames of images collected by the image sensor when the stepper motor drives the image sensor to move in a preset direction according to the first preset number of ...

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Abstract

The invention discloses a method, a device and a system for adjusting a camera back focus. The method comprises steps: during a process during which a stepping motor drives an image sensor to move along a preset direction according to a first preset step number, multiple frames of images acquired by the image sensor are acquired; evaluation value calculation is carried out on each frame of image, and a definition evaluation value of each frame of image is generated; according to the definition evaluation value of each frame of image, a change rate of the definition evaluation value is calculated and obtained; when the change rate of the definition evaluation value is larger than or equal to a first threshold, the stepping motor drives the image sensor to move according to a second preset step number; and during a process during which the image sensor moves along the direction the same as the preset direction according to the second preset step number, if the definition evaluation value of the image acquired by the image sensor reaches a peak value, the image sensor reaches a position with the most clear focus. Thus, the problem of a slow speed during focusing adjustment by the camera in the prior art is solved.

Description

Technical field [0001] The present invention relates to the field of camera focusing, in particular to a method, device and system for adjusting the back focus of a camera. Background technique [0002] At present, for network cameras, fixed-focus lenses are used. When users set them up and use them, they generally rarely go to the scene to adjust the cameras. However, during long-term use, the camera is subject to vibration and other factors will cause a certain amount of virtual focus. In addition, virtual focus may be caused when the filter is switched, especially for those with high resolution and relatively large network delay, the focus will be more troublesome, and the user going to the scene will increase the cost of equipment and operating expenses. [0003] In order to solve the problem of the virtual focus of the camera, in related technologies, a global search method is generally used to adjust the focus. In the method of searching the focus position according to the gl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232
Inventor 吴磊磊王刚强杨天亮
Owner HANGZHOU HIKVISION DIGITAL TECH
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