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Positioning measurement method based on key point detection of marker

A technology for positioning measurement and markers, applied in the field of image processing, can solve problems such as difficulty in on-site analysis, and achieve the effects of wide application range, improved performance, and improved detection speed

Inactive Publication Date: 2010-12-15
INST OF AUTOMATION CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

Due to the irreproducibility of the site, it is difficult to obtain a lot of information from the site re-survey, which brings difficulties to the site analysis, and most of this information exists in the site photos

Method used

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  • Positioning measurement method based on key point detection of marker
  • Positioning measurement method based on key point detection of marker
  • Positioning measurement method based on key point detection of marker

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Embodiment Construction

[0034] Various details involved in the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be pointed out that the described examples are only intended to facilitate the understanding of the present invention, and do not have any limiting effect on it.

[0035] The present invention realizes positioning and measurement of key points in a complex environment by designing scales and markers with obvious features and adopting ordinary cameras to carry out two-dimensional reconstruction, and has quite high precision and robustness. The framework of the system of the present invention is as image 3 , firstly, photograph the environment image containing the key points to be located; then, conduct a series of image analysis such as scale detection and marker detection on the captured image, that is, identification, calibration, measurement, etc., to obtain a series of key point coordinates, and perfor...

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Abstract

The invention relates to a positioning measurement method based on key point detection of a marker, which comprises the following four parts of: 1. design of a ruler and a marker: realizing the ruler and the marker with high environmental adaptation and convenient use and manufacture; 2. detection of the ruler for calibrating: performing multi-threshold segmentation on a compressed image according to a custom segmentation function and positioning the ruler by methods of contour detection, polygon fit, and the like; 3. detection of a key point of the marker: detecting a positioning key point mainly by adopting methods of histogram matching, gray scale projection, Hough transformation segment detection, least square method straight line fit, and the like; and 4. reestablishment of three-dimensional world coordinates: adopting a two-dimensional method of photography measurement. The methods of multi-threshold segmentation, Hough transformation and least square method combination for positioning a straight line, and the like improve the performance and the precision of an algorithm. The invention has wide application range and is suitable for solving various positioning measurement problems based on key point detection.

Description

technical field [0001] The invention relates to the field of image processing, and designs and implements a marker-based key point detection positioning measurement method. Background technique [0002] In monitoring and other related fields, we often need to obtain the location information of certain feature points. The complexity and uncertainty of the background environment make this positioning measurement based on machine vision extremely difficult. This difficulty is manifested in: the robustness of the threshold in the image preprocessing stage, the wrong positioning of the initial positioning and segmentation of feature points, and the accuracy of precise re-segmentation and positioning. The significance of the invention lies in realizing the location measurement of key points in complex environments by designing scales and markers with obvious features, and has quite high precision and robustness. [0003] At present, a lot of on-site and environmental information...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C15/00G01C15/02G01C11/00
Inventor 王欣刚吴亮安闻川
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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