Video monitoring focusing method and device

Abstract

The invention discloses a video monitoring focusing method and a video monitoring focusing device. The method comprises the steps of computing positions of motors at a short focal end and a long focalend of a lens according to a statistical operator corresponding to the definition of a video monitoring image; computing a motor drive step length corresponding to a mechanical error according to thestatistical operator corresponding to the definition of the video monitoring image, and computing the motor drive step lengths corresponding to the mechanical errors at different positions of the motors; performing focusing curve fitting according to the statistical operator from the short focal end to the long focal end of the lens; and when a scene changes or focusing is artificially triggered,continuously performing the computation of the definition operator on the re-acquired video monitoring frame according to the current video monitoring image definition statistical operator and the current position drive motor to acquire a new focusing position, continuously cycling until the motor position with the highest definition is found, and thus completing the focusing. According to the method and device provided by the invention, the production process can be simplified, the production efficiency can be improved, the video monitoring focusing is changed to be automatic from being artificial, the labor is saved, and the point light source focusing effect can be enhanced.

Description

technical field [0001] The invention relates to the field of video monitoring, in particular to a focusing method and device for video monitoring. Background technique [0002] In the field of video surveillance, in order to ensure that the image is always clear in changing surveillance scenes, it is usually necessary to focus according to changes in the actual surveillance scene. The focusing method is usually manual focusing, that is, the definition of video surveillance images is adjusted manually. , when there is a mechanical gear error, it will affect the focus. By manually matching different mechanical back focus and eliminating the mechanical error caused by the gear gap in the mechanical structure, it is guaranteed that the whole process is clear during the zooming process. In addition, manual focus When , there is a problem that the point light source is difficult to focus. It can be seen that the mechanical back focus adjustment process of conventional zoom module...

AI Technical Summary

Problems solved by technology

[0002] In the field of video surveillance, in order to ensure that the image is always clear in changing surveillance scenes, it is usually necessary to focus according to changes in the actual surveillance scene. The focusing method is usually manual focusing, that is, the definition of video surveillance images is adjusted manually. , when there is a mechanical gear error, it will affect the focus. By manually matching different mechanical back focus and eliminating the mechanical error caused by the gear gap in the mechanical structure, it is guaranteed that the whole process is clear during the zooming process. In addition, manual focus When , there is a problem that the point light source is difficult to focus

It can be seen that the mechanical back focus adjustment process of conventional zoom module production is relatively complicated, which not only lowers production efficiency, but also causes waste of manpower

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