Method and device for measuring object length by camera

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

Inactive Publication Date: 2017-07-11
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But when the user only needs to know the approximate size of an item, it is very troublesome to find a ruler for this

Method used

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  • Method and device for measuring object length by camera
  • Method and device for measuring object length by camera

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Embodiment Construction

[0017] 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.

[0018] 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.

[0019] 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 object to be measured is photographed by the camera, and corresponding scales are generated on the screen displaying the picture taken by the camera according to the law of focal length and imaging, thereby forming a "ruler". ", the user compares the object to be measured on the screen with the scale, and can know the length, width and other similar data of the object to be measured, without having to find a ruler for actual measurement. Especially when the method and the device are applied to a smart phone, the length of any object can be known by taking out the mobile phone that is carried around, and the convenience is particularly prominent.

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] Obtaining the focal length when the camera captures the object to be measured, wherein the focal length is the focal length when the camera captures the object to be measured with a clear image; [0006] Find the camera parameters, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/02
Inventor 吴晶
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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