Focusing method and device and mobile terminal

Abstract

The embodiment of the invention discloses a focusing method and device and a mobile terminal. The method comprises: when receiving a focusing instruction for a shot image, acquiring a first position parameter of a focusing motor, and detecting whether a value included in the first position parameter is lower than a preset focus threshold; if yes, carrying out current compensation on a current value of the focusing motor according to a preset compensation rule; acquiring a second position parameter of the focusing motor after carrying out the current compensation; when detecting that a position indicated by the second position parameter is a focusing position, determining that the shot image is successfully focused. By implementing the focusing method and device and the mobile terminal which are disclosed by the embodiment of the invention, power consumption of the terminal can be reduced, and a focusing speed can be promoted.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a focusing method, device and mobile terminal. Background technique [0002] With the continuous development of terminal technology and image processing technology, the camera function of terminals such as mobile phones is used more and more frequently, which brings convenience to users to record their lives. At present, there are many focusing methods for mobile phones, such as phase focusing (English: PhaseDetection Auto Focus, referred to as PDAF). The principle is to reserve some shaded pixels on the photosensitive element for phase detection. Changes, etc. to determine the offset value of the focus, so as to achieve accurate focus, the phase focus is fast, so it is widely used. [0003] In practical applications, due to the influence of factors such as noise and external light when collecting the phase data of the pixels, the output of the phase detection dat...

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Problems solved by technology

[0003] In practical applications, due to the influence of factors such as noise and external light when collecting the phase data of the pixels, the output of the phase detection data is unstable, which makes the defocus (out of focus) position calculated based on the phase detection data unstable. Therefore, when the phase focusing is completed, in order to ensure the accuracy of the focus, an additional fine search is required to further determine the focus position, resulting in a large power consumption of the terminal and reducing the focus speed

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