Synchronous focus method, device, storage medium and electronic terminal during zooming

Abstract

The invention discloses a synchronous focusing device in the zooming process, which includes: judging the zooming mode; when the zooming mode is from small magnification to large magnification; judging whether the current zoom position exceeds the position of the curve separation point; if so, calculating the correction object distance, switch the follow focus curve according to the corrected object distance to drive the motor; if not, use the follow focus curve corresponding to the default object distance to drive the motor; when the zoom mode is from large magnification to small magnification, judge whether it is completed Focus; if yes, obtain the corresponding new focus curve, and use the new focus curve to drive the motor; if not, use the actual focus curve to drive the motor. A synchronous focusing method in the zooming process proposed by the present invention can make corrections in time when the object distance estimation is wrong, and self-adaptively adjusts unreasonable object distance corrections, so that continuous focus can be carried out in the process of continuous zooming, and the image The probability of blurring is lower; the present invention can also maintain a better follow-focus effect in dynamic scenes.

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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