Method for calculating camera field of view

Abstract

The invention discloses a method for calculating a camera field angle, which is based on an automatic follow focus device for video target tracking. The method comprises a first step of booting a red dot laser transmitter; and a second step of controlling a lens zooming ring to rotate to a certain angle by a hand, in the meantime, controlling a cloud holder motor to rotate, so as to enable the red dot laser transmitter to point to the edge of a camera field, storing the rotation angle of the current lens zooming ring and the camera field angle simultaneously, repeating the above process more than once, and recording the correspondences of the rotation angles of multiple lens zooming rings and the camera field angle. According to the method, the current field angle of the camera is calculated through detection of the focal distance of the zooming lens, and the method can automatically calculate the camera field angle according to the change of the lens focal distance and is simple to operate.

Description

technical field [0001] The invention relates to the field of radio, television and film equipment, in particular to a method for calculating the viewing angle of a camera. Background technique [0002] In the prior art, there are devices that use ranging sensors and video target tracking for automatic focusing, but the camera field of view needs to be manually calibrated, and the camera’s field of view cannot be calculated using the lens focal length, so it cannot be applied to zoom lenses. , causing the rangefinder to follow the target inaccurately. Generally speaking, there is a certain positional deviation between the installation position of the gimbal and the optical axis of the camera in the horizontal or vertical direction. The existing automatic follow focus based on video target tracking cannot automatically correct the horizontal position according to the vertical distance between the target and the focal plane. Or positional deviation in the vertical direction. ...

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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