Autofocus method and device for mobile terminal and mobile terminal

Abstract

The embodiment of the invention discloses an automatic focusing method and apparatus for a mobile terminal and the mobile terminal. The method includes the steps of determining a first spot light source determining condition when a focusing event is triggered, and the current focusing area is detected to be in a preset scope on the periphery of a screen, wherein the first spot light source determining condition is less restrict than a second spot light source determining condition corresponding to the focusing area outside the preset scope on the periphery of the screen; determining whether the current shot objected is a spot light source according to the first spot light source determining condition, and executing corresponding focusing operation according to the determining result. When the technical scheme is adopted, the probability of mistakenly determining a spot light source as a non-spot light source is reduced. The scheme of the mobile terminal determining whether a shot object is a spot light source in an automatic focusing process is optimized, focusing accuracy is ensured, defocusing phenomenon is prevented, and the user experience is improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of photographing, and in particular to an automatic focusing method and device for a mobile terminal and a mobile terminal. Background technique [0002] With the rapid development of mobile terminal photography technology, users more and more frequently use mobile terminals to take pictures, so as to conveniently record the scenery and wonderful moments around them. [0003] At present, most of the cameras of mobile terminals support an auto-focus function, so that users can easily take clear photos. During the autofocus process, the motor in the camera will continuously change the lens position, and the image sensor will obtain the focus value (Focus Value, FV) of the subject image corresponding to different lens positions according to the collected information (which can be understood as Contrast), and the lens position when the focus value peaks corresponds to the final focus point...

AI Technical Summary

Problems solved by technology

When the focus area is at the edge of the screen, because the image sensor’s light sensitivity at the edge is weaker than that at the middle position, the resulting focus value will have a certain error. If the subject in the focus area is a point light source, It is likely that the subject cannot be recognized as a point light source due to the inaccurate focus value, so that the mobile terminal cannot perform related processing on the point light source, resulting in inaccurate focus (out of focus)

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