Calibration method and device of zooming tracking curve

Abstract

The invention relates to the technical field of camera shooting monitoring, especially relates to a calibration method and device of a zooming tracking curve. The method comprises following steps of selecting N collection points on a reference zooming tracking curve, wherein the N collection points correspond to different zooming ratio values; obtaining the corresponding theoretical focusing location value of a certain collection point in the N collection points on the reference zooming tracking curve; based on a preset automatic focusing algorithm, obtaining an actual focusing location value under a zooming ratio value corresponding to the collection point when the zooming estimation value is the maximum; repeatedly executing the steps, respectively obtaining the actual focusing location values and the theoretical focusing location values corresponding to the N collection points, thus finishing calibrating the reference zooming tracking curve. According to the method and the device provided by the invention, the own actual zooming tracking curve of each lens can be obtained; in the follow-up zooming and automatic focusing processes, the actual zooming tracking curve can operate synchronously with the calibrated actual reference zooming tracking curve; and the image is focused clearly in the whole zooming process.

Description

【Technical field】 [0001] The invention relates to the technical field of camera monitoring, in particular to a method and device for correcting a zoom tracking curve. 【Background technique】 [0002] The existing integrated video camera has the functions of zooming and auto-focusing, has a compact structure, is easy to use, and has a 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 respectively driven by the zoom motor and the focus motor. During the zooming process, zoom tracking is required to make the focus lens change synchronously according to the position of the zoom lens, so that the image Can focus clearly. [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 tracking curve. However, due to the indivi...

AI Technical Summary

Problems solved by technology

However, 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 zoom tracking curve When doing zoom tracking, the image may have varying degrees of blur

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