Automatic follow focus device based on video target tracking

Abstract

The present invention discloses an automatic follow focus device based on video target tracking, which comprises: a cradle head, a cradle head motor, a cradle head motor driver, a distance measuring sensor used for measuring the distance from a movable target in real time and installed on the cradle head, a video collecting card used for receiving a video signal of a camera and outputting the video signal to a video terminal, the video terminal provided with video target tracking software in advance and used for receiving the video signal of the video collecting card and outputting coordinate values of a followed target relative to an image, a first lens motor and a second lens motor used for driving a focusing ring and a zooming ring of a lens, a lens motor driver used for driving the first lens motor and the second lens motor, and a main controller used for receiving a target distance value outputted by the distance measuring sensor and target coordinate values outputted by the video terminal and controlling the cradle head motor driver and the lens motor driver. The automatic follow focus device of the present invention has the advantages of automatic computation of field angles of the camera, no need of calibration and simple operation.

Description

technical field [0001] The invention relates to the field of radio, television and film equipment, in particular to an automatic focus device based on video target tracking. Background technique [0002] In the existing technology, there are devices that use distance measuring sensors and video target tracking for automatic focusing, but manual calibration of the camera's field of view is required, and the focal length of the lens cannot be used to calculate the camera's field of view, so it cannot be applied to zoom lenses , causing the rangefinder to follow the target inaccurately. Generally speaking, there is a certain position deviation between the installation position of the gimbal and the optical axis of the camera in the horizontal or vertical direction, and the existing automatic focus based on video target tracking cannot automatically correct the level according to the vertical distance between the target and the focal plane. Or the positional deviation in the ve...

AI Technical Summary

Problems solved by technology

[0002] In the existing technology, there are devices that use ranging sensors and video target tracking to perform automatic focusing, but manual calibration of the camera's field of view is required, and the camera's field of view cannot be calculated using the focal length of the lens, so it cannot be applied to zoom lenses , causing the rangefinder to follow the target inaccurately

Generally speaking, there is a certain position deviation between the installation position of the pan / tilt and the optical axis of the camera in the horizontal or vertical direction. The existing automatic focus based on video target tracking cannot automatically correct the level according to the vertical distance between the target and the focal plane. Or the positional deviation in the vertical direction

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