Fast autofocus method and image acquisition device

Abstract

The embodiment of the invention discloses a fast automatic focusing method and an image acquisition device. The method includes: the image acquisition device detects the image data of the shooting object under the current shooting parameters; the shooting parameters include shooting focal length and focus; the image data includes the position and image size of the shooting object in the imaging image; Adjust the image acquisition device so that the position of the subject in the imaging image is at the first position; based on the corresponding relationship between shooting parameters-image data-shooting distance, determine the shooting according to the current shooting focal length, image data and preset image size The target value of the focal length; adjusting the shooting focal length of the image acquisition device to the target value of the shooting focal length. The fast automatic focusing method provided by the embodiment of the present invention realizes automatic focus adjustment and focus shooting according to the acquired image data and shooting parameters of the shooting object, so as to adjust the image data to display in a suitable size.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a fast automatic focusing method and an image acquisition device. Background technique [0002] In the current application of digital cameras and video cameras, automatic recognition and automatic focusing of photographed objects, especially human faces, have been widely used. The face detection technology will locate the exact position of the face in the viewfinder, and then automatically use the face as the subject for focus detection and metering, so as to set accurate focus and exposure. However, in the existing face detection technology, the relationship between the size of the face and the focal length is not considered, and the relationship between the size of the face, the shooting distance, the focus, and the focal length is not considered comprehensively. The size and position of the camera cannot be adjusted automatically, and the photographer still n...

AI Technical Summary

Problems solved by technology

However, in the existing face detection technology, the relationship between the size of the face and the focal length is not considered, and the relationship between the size of the face, the shooting distance, the focus, and the focal length is not considered comprehensively. The size and position of the camera cannot be adjusted automatically, and the photographer still needs to move the camera or the position of the video camera, as well as manually adjust the focus.

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