Zoom tracking curve correction method and device

Abstract

The invention relates to the technical field of camera shooting monitor, in particular to a zoom tracking curve correction method and device. The method comprises the following steps: selecting a reference zoom tracking curve from at least two prestored zoom tracking curves with different focus distances according to a zoom direction and a corresponding default rule so as to drive a zoom motor and a focus motor to rotate synchronously with reference to the reference zoom tracking curve; selecting N collection points corresponding to different zoom magnification values on the reference zoom tracking curve; based on a preset automatic focus algorithm, separately acquiring an actual focus position value when a focus estimation value of any one collection point, at the corresponding zoom magnification value, in the N collection points reaches the maximum value; and with reference to the acquired actual focus position values corresponding to the N collection points, completing the correction of the reference zoom tracking curve. Through adoption of the method and the device, an actual zoom tracking curve of each shot can be acquired, so that synchronous operation of follow-up zooming and automatic focus along with the corrected actual zoom tracking curve can be ensured, thereby making the focus of images in a whole zooming process clear.

Description

【Technical field】 [0001] The invention relates to the technical field of camera monitoring, in particular to a method and device for correcting a variable magnification tracking curve. 【Background technique】 [0002] The existing integrated video camera has the functions of variable magnification and automatic focusing, and has the advantages of compact structure, convenient use and wide monitoring range, and has been widely used in the field of video monitoring. In the integrated camera lens, the zoom lens and the focus lens move separately, and are driven by the zoom motor and the focus motor respectively. During the zoom process, zoom tracking is required to synchronize the focus lens according to the position of the zoom lens. changes so that the image can be in focus. [0003] Usually, the lens manufacturer will provide a fixed ideal zoom tracking curve corresponding to the lens, so that the camera can realize zoom tracking and automatic focus according to the zoom tra...

AI Technical Summary

Problems solved by technology

However, in the prior art, when the reference zoom tracking curve is selected, there is no distinction between the two different zoom directions.

[0004] Moreover, due to the individual differences of lenses, when using a certain lens, it is necessary to adjust and confirm the optical reference position of zoom and focus of each lens to obtain the most suitable zoom tracking curve. If the fixed ideal reference When doing zoom tracking with zoom tracking curve, the image may have different degrees of blur

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