Method and device for measuring length of object through camera

A camera and object technology, which is applied in the field of measuring the length of an object through a camera, can solve problems such as troublesome finding a ruler, and achieve the effect of highlighting convenience.

Active Publication Date: 2014-02-19
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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Problems solved by technology

But when the user only needs to know the approximate si...

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  • Method and device for measuring length of object through camera

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[0015] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and do not limit the protection scope of the present invention.

[0016] The law of the object captured by the camera is that the distance is large and the distance is small, and the length of the object cannot be directly obtained. However, the analysis of the imaging principle of the camera shows that the size of the image is related to the focal length and follows certain rules. For a known camera, after its focal length is determined, the size of the captured object is proportional to the actual size of the object, and the proportional relationship can be known through various parameters of the camera.

[0017] Based on the ab...

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Abstract

The invention discloses a method and device for measuring the length of an object through a camera. The method comprises the steps that the object to be measured is shot through the camera; according to the rule of the focal length and imaging, a corresponding scale is generated on a screen displaying the image shot by the camera, so that a ruler is formed; a user compares the object to be measured on the screen with the scale, and therefore data such as the length of the object to be measured and the width of the object to be measured can be obtained. A user does not need to find a ruler to actually measure the object to be measured. Specially, when the method and device for measuring the length of the object through the camera are applied to a smart phone, the user can obtain the length of any object just by taking out the smart phone carried with the user, and therefore convenience is remarkable.

Description

technical field [0001] The invention relates to the technical field of mobile terminals, in particular to a method and a device for measuring the length of an object through a camera. Background technique [0002] In order to obtain the length of an object, the traditional method mainly uses a ruler to measure. But when the user only needs to know the approximate size of an item, it is very troublesome to find a ruler for this. Contents of the invention [0003] Based on the above situation, the present invention proposes a method and device for measuring the length of an object through a camera to measure the length of the object. [0004] A method for measuring the length of an object through a camera, comprising the steps of: [0005] Obtain the focal length when the camera captures the object to be measured; [0006] Find the camera parameters, and determine the ratio of the imaging length corresponding to the focal length to the actual length; [0007] According t...

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Application Information

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IPC IPC(8): G01B11/02
Inventor 吴晶
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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