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Focusing method, apparatus, computer readable storage medium and electronic device

A focus method and focus position technology, applied in the direction of TV, electrical components, color TV, etc.

Active Publication Date: 2020-11-03
重庆紫光华山智安科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, focusing quickly and accurately is a technical challenge

Method used

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  • Focusing method, apparatus, computer readable storage medium and electronic device
  • Focusing method, apparatus, computer readable storage medium and electronic device
  • Focusing method, apparatus, computer readable storage medium and electronic device

Examples

Experimental program
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Effect test

Embodiment

[0043] The embodiment of the present invention provides a focusing method, which is especially suitable for scene capture in the security field. Focusing methods include such as figure 1 S101~S103 shown in the following combination figure 1 S101 to S103 will be explained.

[0044] S101: Determine whether the amount of change in brightness of an image captured by a camera is smaller than a set threshold.

[0045] S102: When the change in brightness is less than the set threshold, determine the first focus range of the lens according to the current object distance and the zoom distance.

[0046] S103: Control the focus of the lens to move within the first focus range, so as to determine the best focus position.

[0047] When the focus is at the best focus position, it is determined that the camera is focused accurately, and the camera captures the clearest scene image.

[0048] By adopting the above scheme, when the brightness change of the captured image is less than the se...

Embodiment approach

[0143] A1. Auto focus From the captured image, it means that after auto focus is triggered, the clearness of the image in the region of interest is a process of gradual clarity. In principle, it is to determine the direction and number of steps to drive the focus motor according to the obtained evaluation value of image sharpness (image sharpness value), so as to drive the direction, number of steps and step length of the focus of the lens. Let the focus motor stop at the position corresponding to the focus position with the maximum evaluation value of image clarity, that is, the focus is completed.

[0144] If you simply search for the whole world, the search range will be large, and the focusing speed will be very slow, which cannot be used. Compared with the global search, the focusing speed of the existing algorithm strategy has been greatly improved, but the following modules can still be used to achieve the focusing speed and smoothness. degree of further improvement.

...

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Abstract

Embodiments of the present invention provide a focusing method, device, computer-readable storage medium, and electronic equipment. The method includes: judging whether the amount of brightness change of an image captured by a camera is less than a set threshold, and when the amount of brightness change is less than the set threshold , the first focus range of the lens is determined according to the current object distance and the zoom distance, and the focus of the lens is controlled to move within the first focus range to determine the best focus position. The technical problem of not being able to focus quickly and accurately in the prior art is solved, and the technical effect of focusing quickly and accurately is achieved.

Description

technical field [0001] The present application relates to the security field, and in particular, relates to a focusing method, device, computer-readable storage medium, and electronic equipment. Background technique [0002] The security and stability of the people's society is currently a topic of great importance. Intelligent monitoring has promoted the development of the security field and guaranteed the safety of people's lives and property. The effectiveness of intelligent surveillance mainly depends on the clear scene images captured by the camera. [0003] Obtaining clear images depends on whether the camera is accurately focused. In the field of intelligent monitoring, due to the complexity of the scene, it is necessary to quickly obtain clear scene images to ensure the effectiveness of intelligent monitoring. Quickly obtaining clear scene images depends on the speed and accuracy of focusing. and stability. However, focusing quickly and accurately is a technical ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232
CPCH04N23/67H04N23/695
Inventor 周元华
Owner 重庆紫光华山智安科技有限公司
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