Autofocus method, device, equipment and storage medium

Abstract

The embodiments of the present invention disclose an automatic focusing method, device, equipment and storage medium. The method includes: by determining the proportion of infrared light in the current monitoring environment, and according to the proportion of infrared light, determining the zooming following curve of the lens under the current object distance, and then determining the zooming operation of the lens during the zooming operation of the lens. At least two zoom positions, and according to the zoom follow curve of the lens at the current object distance, follow the focus at the focus position associated with each zoom position, and after the zoom operation, according to the obtained focus position, perform automatic focusing . By adopting the technical solutions of the embodiments of the present invention, it can be ensured that when the camera is zoomed from the wide-angle end to the telephoto end, the optical image projected onto the surface of the image sensor through the lens will always maintain a good image effect. After the operation process, the focus position corresponding to the best clear point of the image can be quickly found, which improves the efficiency of automatic focus.

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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