A system, method and mobile phone for automatically adjusting camera focal length

Abstract

The invention relates to a system and method capable of automatically adjusting focal length of camera. The system comprises an image shoot module, an image identification module, a comparing module and a focal length adjusting module. The image shoot module is used for opening a camera lens and obtaining a preliminary image signal when a starting signal of the camera lens is received. The image identification module is used for identifying a face outline in the preliminary image signal and calculating the size of the face. The comparing module is used for comparing the calculated size of the face with a preset size of the face to generate a focal length adjusting signal. The focal length adjusting module is used for adjusting focal length of the camera lens based on the received the focal length adjusting signal. The image shot by the camera lens is identified by the face in advance and the focal length of the camera lens is adjusted by calculating the size of the face. When the size of the face is bigger, the focal length of the camera lens is shortened. When the size of the face is smaller, the focal length of the camera lens is lengthened, and thereby photography of appropriate size of a portrait is convenient to shoot. Snap photography for a user is convenient. User experience degree is improved.

Description

Technical field [0001] The present invention relates to the technical field of image shooting, and more specifically, to a system, a method and a mobile phone for automatically adjusting the focal length of a camera. Background technique [0002] On mobile devices such as smart phones, taking pictures has become an indispensable and important function, and most of the cameras on mobile devices such as smart phones now have face recognition and focus functions. However, the focus function of the camera on the existing smart phones and other mobile devices is usually manual focus, so that when the user is shooting a person, when the person is far away from the camera, the portrait is small; the person is closer to the camera The portrait is very large when positioned. Therefore, in order to be able to take a better portrait photo, the user needs to manually increase or decrease the focal length. If the user wants to capture a momentary photo, it may waste time due to manual focusi...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a system, a method and a mobile phone for automatically adjusting the focal length of a camera in view of the defect that the camera function of an existing camera or mobile phone needs to be manually adjusted to adapt to the size of the portrait, resulting in low user experience.

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