Method and device for autofocusing an object by a front camera

By determining the photographer's 3D gaze ray through the front-facing camera, calculating the intersection point, and driving the rear-facing camera to focus, this solves the problem of autofocusing based on the photographer's attention, which is not possible in existing technologies, and improves the accuracy and relevance of imaging.

CN122120614APending Publication Date: 2026-05-29SHENZHEN GUANGQIZHIJING TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN GUANGQIZHIJING TECHNOLOGY CO LTD
Filing Date
2026-02-02
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing autofocus technologies mainly rely on the image features or distance information of the subject, which may lead to locking onto the wrong target and failing to achieve autofocus 'centered on the photographer's attention', thus affecting the imaging effect.

Method used

The front-facing camera determines the photographer's 3D gaze ray and calculates its intersection point with the current image captured by the rear camera, driving the rear camera to focus on the object where the photographer's attention is.

Benefits of technology

It achieves autofocus 'centered on the photographer's attention', improving the accuracy and image relevance of captured images and ensuring that the image results meet the user's expectations.

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Abstract

The application provides an automatic focusing method and device for focusing on an object by a front camera, which comprises the following steps: performing line-of-sight estimation according to face information, eye information and head information collected by the front camera on a photographer to obtain a 3D gaze ray; capturing a current picture by a rear camera; calculating the intersection of the 3D gaze ray and the current picture; determining the position of the intersection in the current picture, and driving the rear camera to focus on the position in the current picture according to the intersection. The 3D gaze ray of the photographer is determined by the front camera, the intersection of the 3D gaze ray on the current picture captured by the rear camera is determined, then the visual attention of the photographer on a certain object to be photographed is determined, and finally the object to be photographed is focused. The automatic focusing shooting with the photographer's attention as the center is realized, the accuracy of matching the shooting image with the shooting intention of the photographer is improved, and the relevance of the shooting imaging is enhanced.
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