A telephoto lens automatic focusing device

Abstract

The invention provides an automatic focusing device for a telephoto lens, which relates to the field of security equipment and includes a processor, a video source docking interface, a control signal conversion chip, a lens control wiring interface, and a video output respectively connected to the processor. an interface and a power input interface; the control signal conversion chip is also connected with the lens control wiring interface; it also includes a pan-tilt control line interface connected with the control signal conversion chip. The telephoto lens auto-focusing device of the present invention has the function of realizing the auto-focusing of the telephoto lens, and supports the 3D control function of the pan / tilt and the lens. It can be used in video imaging, automatic focusing of telephoto lens; and 3D coordinate positioning function when video event detection is linked to alarm, so as to accurately enlarge the image required for video alarm.

Description

【Technical field】 [0001] The invention relates to the field of security equipment, in particular to an automatic focusing device for a telephoto lens. 【Background technique】 [0002] Video event analysis technology is an emerging technology developed in various monitoring fields in recent years. This technology originated in the United States, has been sublimated by higher technology in France, and has been widely used and popularized in China. It has a wide range of links, so it is preferentially recognized 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 analysis function. At present, the focusing methods of the telephoto lens are all electric focusing, which requires waiting for manual manual commands to achieve focusing and obtain a clear image. Therefore, even if the gimbal supports the function of tracking preset position and a...

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)

[0003] 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

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