Focusing method and focusing system based on distance sensor of mobile terminal

Abstract

The invention discloses a focusing method and a focusing system based on a distance sensor of a mobile terminal. The focusing method comprises the following steps of detecting that a camera shooting function of the mobile terminal is started; acquiring and storing the distance between a current camera and an object to be shot by using the distance sensor; judging a current distance between the camera and the object to be shot is the same with a previous distance between the camera and the object to be shot or not by using the distance sensor; inquiring a pre-stored focusing fine adjustment range table so as to obtain a fine adjustment range of a motor according to the current distance if the current distance between the camera and the object to be short is the same with the previous distance between the camera and the object to be shot; controlling movement of the motor in the fine adjustment range; acquiring images in real time; acquiring focusing values of the images acquired by the motor moving at different positions in the fine adjustment range; and controlling the motor to move to a position at which the focusing value is maximum so as to finish focusing. When the object moves, the focusing system is triggered to focus; and because the focusing fine adjustment range is preset, an optimal focal distance can be found out by comparing a few of frames of images, the focusing speed is increased, and the focusing method and the focusing system bring convenience to a user when the user takes photos.

Description

technical field [0001] The present invention relates to the technical field of mobile terminals, in particular to a focusing method and focusing system based on a distance sensor of a mobile terminal. Background technique [0002] With the development of mobile communications and the continuous improvement of people's living standards, the use of various mobile terminals such as mobile phones has become more and more popular, and mobile phones have become an indispensable communication tool in people's lives. [0003] The traditional mobile phone camera focus algorithm is to obtain the focus value of the image at different motor positions by constantly moving the motor, also known as the FV (focus value) value, to judge the clarity of the image. After scanning, the best motor position is judged, and then Move the motor to the clearest position. Complete a focusing action. The whole process depends on the range of the search, and the frame rate varies from 0.5 to 2 seconds....

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a focusing method and focusing system based on the distance sensor of the mobile terminal in view of the above-mentioned defects of the prior art, aiming to solve the problem that the user takes too long to take pictures or focuses repeatedly in the prior art. Delayed shooting time flaws

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