Automatic focusing apparatus for telephoto lens

Abstract

The invention, which relates to the safety protection equipment, provides an automatic focusing apparatus for a telephoto lens. The automatic focusing apparatus comprises a processor, a video source docking interface, a control signal conversion chip, a lens control wiring interface, a video output interface and a power input interface, wherein the video source docking interface, the control signal conversion chip, the lens control wiring interface, the video output interface and the power input interface are connected with the processor; and the control signal conversion chip is also connected with the lens control wiring interface. In addition, the automatic focusing apparatus also includes a cloud deck control line interface connected with the control signal conversion chip. The automatic focusing apparatus having a function of realizing automatic focusing of a telephoto lens supports the 3D control function for the cloud deck and the lens and can be applied to automatic focusing of the telephoto lens in video imaging and 3D coordinate positioning during video event detection linkage alarming, so that the image needed by video alarm can be amplified precisely.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of security equipment, in particular to an automatic focusing device for a telephoto lens. [0003] 【Background technique】 [0004] Video event analysis technology is an emerging technology that has been developed rapidly in various monitoring fields in recent years. This technology originated in the United States, got a higher technical sublimation in France, and has been widely used and popularized in China. Due to its many early warning functions, the application The link is relatively wide, so it is given priority by users. However, due to the influence of the automation level of the video acquisition equipment, only the all-in-one PTZ camera or the all-in-one dome camera can realize the image tracking and analysis function. At present, the focusing method of the telephoto lens is electric focusing, and it needs to wait for manual commands to realize focusing and obtain a clear image. Therefore, even if t...

AI Technical Summary

Problems solved by technology

At present, the focusing method of the telephoto lens is electric focusing, and it needs to wait for manual commands to realize focusing and obtain a clear image. Therefore, even if the pan / tilt supports tracking preset positions and alarm input functions, it can only realize the X-axis (that is, the horizontal direction) ) and the Y-axis (vertical direction) two-dimensional positioning function, but the image of the depth of field of the lens cannot be enlarged to fit the full screen of the alarm point size and the image positioned on the Z-axis (the direction of the depth of field of the lens) with clear focus (that is, after 3D positioning clear image)

[0005] Since the telephoto lens is widely used in the field of special monitoring, but none of them can realize the functions of auto focus and 3D positioning, which seriously affects the application effect and the timeliness of capturing pictures of the telephoto lens in practical application, so one can realize The telephoto lens auto-focus function, which can also meet the cloud mirror control, and the device that can realize the image 3D positioning function has become another technical demand in the monitoring field

Images