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...

Examples

Embodiment Construction

[0015] In order to solve the problems existing in the prior art, the telephoto lens automatic focusing device of the present invention is a multifunctional control module in form, which can be directly connected to the lens control wire and placed in the lens shield, or can be placed in the lens Outside the shield, it is connected with the PTZ control line, and then connected with the power supply, and communicates with the external control function through the communication control interface. When zooming in on the telephoto lens, the device will automatically activate the auto-focus function to get a clear image. If the auto-focus image is unreal, it can be corrected by manual focus. The device also supports the auto-focus function after the scene changes, that is, when the pan / tilt is rotated, the device will automatically start the auto-focus function to obtain a clear image. If the auto-focus image is not real, it can be corrected by manual focus. After connecting with th...

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...

Examples

Embodiment Construction

[0015] In order to solve the problems existing in the prior art, the telephoto lens automatic focusing device of the present invention is a multifunctional control module in form, which can be directly connected to the lens control wire and placed in the lens shield, or can be placed in the lens Outside the shield, it is connected with the PTZ control line, and then connected with the power supply, and communicates with the external control function through the communication control interface. When zooming in on the telephoto lens, the device will automatically activate the auto-focus function to get a clear image. If the auto-focus image is unreal, it can be corrected by manual focus. The device also supports the auto-focus function after the scene changes, that is, when the pan / tilt is rotated, the device will automatically start the auto-focus function to obtain a clear image. If the auto-focus image is not real, it can be corrected by manual focus. After connecting with th...

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