Continuous focusing method and device

Abstract

The invention relates to a focusing technology of imaging equipment, and discloses a continuous focusing method and device. The continuous focusing method comprises the following steps: acquiring a change tread of an area of a focus target in a current image relative to an area of a focus target completed in the previous in-focus in the image, wherein the focus target is a photographed object; according to the change tread of the area of the focus target in the image, recognizing a direction of motion of the focus target; if the area of the focus target in the image is in an increasing tread, then recognizing the direction of motion of the focus target is close to imaging equipment; if the area of the focus target in the image is in a decreasing tread, then recognizing the direction of motion of the focus target is away from the imaging equipment; and adjusting a position of the focus until in-focus again according to the direction of motion of the focus target. Compared with the prior art, the continuous focusing method and device provided by the invention can improve the focusing speed.

Description

technical field [0001] The invention relates to the focusing technology of imaging equipment, in particular to a continuous focusing method and device. Background technique [0002] Most of the existing autofocus imaging devices, including most consumer cameras and most mobile phones, use contrast focusing. Wherein, the imaging device determines the position of the focal point by moving the focusing lens group back and forth. [0003] In the continuous focus mode, when the focus target is in motion, if the object to be photographed is out of the focus range, the device needs to move the mirror group back and forth to refocus. The specific process is as follows: figure 1 As shown, steps 101-111 are included. from figure 1 It can be seen from the figure that in the continuous focus mode, if the imaging device is not in focus, it will move the focus lens group closer to the imaging device according to the preset focusing scheme. If the contrast of the focus position becomes ...

AI Technical Summary

Problems solved by technology

[0004] It can be seen from the above that in the continuous focus mode, to focus on a moving subject, the focus lens group must be moved forward and backward relative to the imaging device to confirm the movement direction of the subject, and then focus according to the confirmed movement direction , however, it will take some time to move the focus lens group, which affects the speed of focusing

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