Automatic focusing method, device and equipment and storage medium

Abstract

The embodiment of the invention discloses an automatic focusing method, device and equipment and a storage medium. The method comprises the following steps: determining an infrared light proportion ina current monitoring environment, and according to the infrared light ratio, determining a zoom following curve of the lens under the current object distance; determining at least two zoom positionsof the lens in the zoom operation process of the lens, carrying out following focusing at focusing positions associated with the zoom positions according to a zoom following curve of the lens under the current object distance, and carrying out automatic focusing according to the obtained focusing positions after zoom operation. According to the technical scheme of the embodiment of the invention,when zooming is carried out from the wide-angle end to the telephoto end, it can be guaranteed that the optical image projected to the surface of the image sensor through the lens can keep a good image effect all the time, and therefore the focusing position corresponding to the optimal clear point of the image can be rapidly found after the zooming operation process is finished, and the automaticfocusing efficiency is improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of video surveillance, and in particular, to an automatic focusing method, device, equipment, and storage medium. Background technique [0002] With the rapid development of the surveillance industry and the continuous improvement of customer demand for surveillance, more and more large-magnification lenses are used in practical applications. In the surveillance industry, cameras in the industry generally use infrared fill light for supplementary light at night. When the ambient light at night becomes low, the camera turns on the infrared fill light for supplementary light. At this time, there will be both visible light and infrared light. In addition, some cameras will use the stronger penetrating ability of infrared light to filter out part of the visible light in natural light and retain infrared light, so as to achieve better fog penetration effect. [0003] However, for the exist...

AI Technical Summary

Problems solved by technology

[0003] However, for the existing high-magnification lenses on the market, due to the dispersion phenomenon of lens glass, different wavelengths of light have different refractive indices, which makes it difficult for large-magnification lenses to maintain a consistent focal plane from visible light to infrared light, resulting in infrared The phenomenon of defocusing, and as the focal length increases, the difference between the imaging focal planes of visible light and infrared light will become larger and larger

In the process of realizing the present invention, the inventor found that when monitoring an environment where visible light and infrared light exist at the same time, the camera cannot ensure that the visible light and infrared light are confocal when zooming from the wide-angle end to the telephoto end, which will also affect the camera. Autofocus poses a bigger challenge

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