Camera module focus locking method, device, equipment and medium

Abstract

The invention discloses a camera module focus locking method and device, equipment and a medium. The camera module focus locking method comprises the steps: measuring the actual stroke length of a focusing and zooming motor; determining a first zoom point set by using the actual zoom stroke length; determining a first focusing position; controlling a zoom motor to move to a first zoom point, controlling a focusing motor to move to a corresponding position, controlling the focusing motor to move, and determining a target focusing position corresponding to the zoom point by utilizing the image definition index in movement; removing zoom points meeting a first preset condition from the first zoom point set according to the actual focusing stroke length to obtain a target zoom point set; dividing all the target zoom points into a target zoom point group, wherein any target zoom point group comprises a preset number of adjacent zoom points; any target zoom point group is used for fitting acorresponding quadratic curve by utilizing the target zoom points; generating a forward zoom focusing curve by using all quadratic curves; and determining a reverse zoom focusing curve by utilizing the forward zoom focusing curve and the reverse error so as to complete focus locking.

Description

technical field [0001] The present application relates to the field of camera technology, and in particular to a camera module focus locking method, device, equipment and medium. Background technique [0002] A zoom lens generally has two stepping motors, one motor controls the zoom, the other motor controls the focus, and different zoom points have different focus positions. In order to keep the image in a clearer state during the continuous zooming process, the existing method is realized through the following steps. First, a series of zooming points are selected within the zooming range; The focus position of each zoom point, the specific method for each zoom point is that each zoom point corresponds to a focus range, and within this range, the focus position is searched in the forward direction, and finally the reverse order of all the zoom points is obtained in turn. focus position, so that two sets of zoom focus position tables are obtained. Subsequent positive zoomi...

AI Technical Summary

Problems solved by technology

However, there are several disadvantages in doing so. First, the process of forward searching the focus position for a certain zoom point within a certain focus range is time-consuming. Second, it is also time-consuming to obtain two sets of zoom focus tables. Third, It may happen that the zoom range is not large enough or the focus of the zoom points at both ends is not clear. Fourth, the focus position of the non-sampling zoom point is generally obtained by bilinear interpolation, which is not accurate enough

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