Method for detecting displacement of non-contact moving target

A moving target, displacement detection technology, applied in measurement devices, image data processing, instruments, etc., can solve the problems of low reliability and great influence of environmental conditions, and achieve the effect of high detection reliability and strong environmental adaptability

Inactive Publication Date: 2011-05-11
WUYI UNIV +2
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Problems solved by technology

[0008] Aiming at the problem that the detection result of the existing displacement detection method using image processing is greatly affected by environmental conditions and has low reliability, the present invention proposes a non

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  • Method for detecting displacement of non-contact moving target
  • Method for detecting displacement of non-contact moving target
  • Method for detecting displacement of non-contact moving target

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[0064] The following is a specific implementation method to illustrate a non-contact moving target displacement detection method of the present invention, see Figure 1 to Figure 4 :

[0065] For the convenience of description, first make an agreement on the meaning of the following terms:

[0066] Binary coding matrix: a matrix whose elements take the value "0" or "1";

[0067] Binary random coding matrix: a matrix in which element values ​​are randomly selected as "0" or "1" according to a given probability;

[0068] Binary coded image array: a whole column of equal-sized rectangular units evenly arranged from left to right and top to bottom. Each rectangular unit represents the value "0" or "1" in dark and light colors, respectively. The entire image array corresponds to A binary coding matrix;

[0069] Symbol: A rectangular unit in the binary coded image array is called a symbol;

[0070] Binary random coded image target: a plane printed with a binary random coded image array that ...

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Abstract

The invention provides a method for detecting displacement of a non-contact moving target. The displacement is detected by using cross correlation characteristic of a two-value random coding image target and a random matrix. The target which is fixedly connected with an object to be tested and moves along with the object is printed with the two-value random coding image; and a coding value of the coding image corresponds to a two-value random matrix (a target matrix). A target region is photographed at different moments at a fixed optical axis and a fixed visual angle; and a local image of the target obtained each time is decoded to form a sub-matrix (a detection matrix) of the target matrix. Offset of a peak value of a cross correlation function of the detection matrix and the target matrix at different moments is proportional to displacement distance of the object to be tested, so the detection is realized according to the relation. According to characteristics of the cross correlation function of the random matrix, the method has high detection accuracy, high anti-interference capacity and low requirement on image quality and is suitable for long-term on-line automatic detection at different observation distances.

Description

technical field [0001] The invention relates to a method for detecting the displacement of a non-contact moving object, in particular to a method for detecting the displacement of a non-contact moving object by using an image processing method. Background technique [0002] In the monitoring of the safety status of large building structures such as bridges, buildings, and dams, and the monitoring of natural disasters such as landslides and ground subsidence, it is necessary to perform long-term, continuous detection and recording of the displacement of certain specific points on the target. The displacement detection technology and equipment used in this occasion must have the characteristics of long-distance and non-contact. There are three types of detection methods currently available for the above occasions: [0003] (1) The laser total station has high measurement accuracy, but the equipment is expensive, has high requirements for the working environment and installati...

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Application Information

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IPC IPC(8): G01B11/04G06T7/00
Inventor 樊可清王玲
Owner WUYI UNIV
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