Camera focusing method, focusing device and mobile terminal

Abstract

The invention provides a camera focusing method comprising the steps that when a camera starting instruction is received, a camera is started and a first camera module group and a second camera module group are initialized, and the process enters a preview frame; the first camera module group performs imaging on a reference object in the preview frame so that a first image is formed on a first light-sensitive surface, and the second camera module group performs imaging on the same reference object so that a second image is formed on a second light-sensitive surface; first height information and first distance information of the first image and second height information and second distance information of the second image are acquired, and target distance from the reference object to the first and second light-sensitive surfaces is calculated according to the first height information, the second height information, the first distance information and the second distance information; and a preset focal length mapping table is inquired according to the target distance, and the first and second camera module groups are driven to perform focusing according to the inquiring result. Rapid and precise focusing can be realized by the camera focusing method. The invention also provides a focusing device and a mobile terminal.

Description

technical field [0001] The present invention relates to the field of optics, in particular to a camera focusing method, a focusing device and a mobile terminal using the camera focusing method and the focusing device. Background technique [0002] With the development of communication technology and the improvement of design and manufacturing level, it has become the main trend of product development to equip high-pixel cameras in smart terminal products such as mobile phones and tablet computers. In recent years, in order to further enhance the shooting experience of smart terminal products, smart terminals equipped with dual camera modules have gradually entered the market and have been favored by consumers. Compared with a smart terminal with a single camera, a smart terminal equipped with a dual camera module includes two independent lens modules, one of which is a wide-angle lens module and the other is an optical zoom lens module, thus enabling better depth-of-field an...

AI Technical Summary

Problems solved by technology

However, in the above scheme, it can be known from the denominator form of X=(S+S2-S1) / (1 / tg∠A-1 / tg∠B), if the first incident angle ∠A and the second incident angle ∠B A slight error in the tangent value of , may lead to a large error in the final calculated distance X from the shooting target D to the straight line where the photosensitive device is located, and then lead to focus failure

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