Synchronous focusing method and device during zoom process, storage medium and electronic terminal

Abstract

The invention discloses a synchronous focusing device during the zoom process. The synchronous focusing device is performed according to the steps of judging a zoom mode; judging whether a current zoom position exceeds the position of a curve separation point or not when the zoom mode is changed from small rate to large rate; if yes, calculating correction object distance, switching a follow focuscurve to drive a motor according to the correction object distance; if not, driving the motor by the follow focus curve corresponding to default object distance; judging whether focusing is completedor not when the zoom rate is changed from small rate to large rate; if yes, obtaining a corresponding new follow focus curve, and driving the motor by the new follow focus curve; and if not, drivingthe motor by an actual follow focus curve. According to the synchronous focusing method during the zoom process, proposed by the invention, correction can be timely performed when the object distanceis estimated to be wrong, unreasonable object distance correction is adaptively adjusted, continuous focus following during the continuous zoom process also can be achieved, and the probability that an image is fuzzy is lower. In a dynamic scene, a relatively good focus following effect also can be maintained.

Description

technical field [0001] The invention belongs to the technical field of positioning, and in particular relates to a synchronous focusing method, device, storage medium and electronic terminal during a zooming process. Background technique [0002] The control of the zoom motor and focus motor of the movement lens is more precise than that of the electric lens. It is widely used in monitoring equipment to achieve large-scale monitoring while maintaining good image effects. How to drive the focus motor to focus accurately while zooming and keep the image clear is of great significance for the monitoring equipment to continuously monitor the scene. [0003] The existing follow-focus methods mainly include geometric methods, machine learning methods, and feedback adjustment methods. The geometric method obtains the estimated focus curve through interpolation of two focus curves, but as the magnification increases, the estimated deviation will become larger. Or determine the obj...

AI Technical Summary

Problems solved by technology

The feedback adjustment focus detection in the existing papers is to detect the near and far ends of the focus when the zoom is not moving, and calculate the corrected object distance step according to the pid formula. This method can also have a better follow-up to the moving subject focus effect, but the parameter debugging is more cumbersome, and the zoom cannot be continuously changed, which will cause the picture to freeze. Using the traditional pid formula does not work well when continuously zooming

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