Distance measurement method based on single camera

一种测距方法、单相机的技术，应用在测距领域，达到扩大适用范围、降低技术难度的效果

Inactive Publication Date: 2021-09-07
WENZHOU MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not rely on other sensors of the terminal, which is more convenient, but it needs to set the reference object or reference scale in advance

Method used

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with drawings and embodiments.

[0023] In this embodiment, the camera that comes with a single Android phone needs to be used to estimate the straight-line distance between the camera and the target object. The implementation method is as follows:

[0024] (1) in such as figure 1 In the target object shown, the upper, lower, left, and right boundaries E L ,E R ,E L ,E B A pair of vertically parallel feature lines S on the surface of the object L , S R Clearly visible, select the feature line S on the surface of the object L , S R for the marking line.

[0025] (2) Open the camera parameter setting program and display the screen reference line, such as figure 2 As shown, select two parallel reference lines S in the vertical direction L , S R as screen bounds lines.

[0026] (3) if Figure 4 As shown, the target object is located at point A, and there are two marking lines S on the target ...

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Abstract

The invention discloses a distance measurement method based on a single camera in the technical field of distance measurement, which is used for estimating the linear distance between a camera and a target object when only one camera is arranged, and comprises the following implementation steps of: selecting two parallel marker lines on the target object in the horizontal or vertical direction; setting two range lines on a camera screen, wherein the two range lines are in the same direction as the target object marker line and are parallel to the target object marker line; adjusting the focal length of the target object to enable the target object marker line and the camera screen range line to coincide and photograph, and recording a camera focal length value; moving forwards or backwards for a certain distance along the connecting line direction of the target object and the camera; adjusting the focal length again to enable the target object marker line to coincide with the camera screen range line, photographing, and recording a camera focal length value; and calculating the linear distance between the camera and the target object through a camera imaging principle formula when the camera photographs for the first time. According to the method, only a single camera is needed, other equipment is not additionally arranged, a complex image processing technology is not involved, and the method is simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of distance measurement, and in particular relates to a method for estimating the linear distance between itself and a target object by using a single camera. Background technique [0002] Ranging is closely related to our lives, such as distance sensors in mobile phones, car reversing sensors, navigation and so on. In order to obtain more accurate ranging results, most ranging methods rely on one or more professional devices or sensors, such as lidar, GPS (Global Positioning System), cameras, optical or acoustic sensors, etc. The method is complex, with high technical requirements and high barriers to use. Thanks to the popularization of smart phones and digital cameras and the development of machine vision and image processing technology, the use of camera distance measurement has become one of the conventional means of distance measurement. As far as cameras are concerned, there are monocular cameras, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C3/00
CPCG01C3/00
Inventor 王振峰周梅玫纪晓亮
Owner WENZHOU MEDICAL UNIV
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