Method for correcting multiple-sensor point cloud registration errors

A point cloud splicing, multi-sensor technology, applied in instruments, measuring devices, optical devices, etc., can solve the problems of complex standard objects, the inability of correction algorithms to facilitate error correction, and the inability to correct errors of multiple scanners or sensors. The effect of smooth splicing and error reduction

Active Publication Date: 2014-05-21
TIANJIN UNIV
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Problems solved by technology

[0005] Although the above-mentioned first method can correct the error of the body scanner from two aspects of width and depth, the standard object used is complicated, and the established correction algorithm cannot perform error correction conveniently a

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  • Method for correcting multiple-sensor point cloud registration errors
  • Method for correcting multiple-sensor point cloud registration errors
  • Method for correcting multiple-sensor point cloud registration errors

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[0045] The laser three-dimensional human body scanner adopted in this embodiment is the laser three-dimensional human body scanner provided in the patent No. 200510013085.8. It includes 4 columns, each column is equipped with a set of sensors, and each set of sensors consists of a line laser light source and two symmetrically distributed CCDs. The four laser light sources are located on the same horizontal plane, forming a ring on the surface of the human body. Under the action of the synchronous scanning system, the 4 groups of sensors scan layer by layer at a certain scanning interval from top to bottom. The scanning range is 1000mm in diameter, 2000mm in height, the horizontal resolution is 2mm, the depth resolution is 2mm, the vertical resolution is 4mm, and the scanning time is 16.7 seconds. Using the correction algorithm of the present invention, an error correction model is first established, and then correction experiments are carried out on aluminum alloy cylinders, ...

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Abstract

The invention provides a method for correcting multiple-sensor point cloud registration errors. The method is implemented based on Matlad software platform by taking a laser three-dimensional human body scanner as a scan tool and a hollow alumium-alloy cylinder as a standard object; the method specifically comprises the steps of establishing a true value, establishing a relationship between scan data and a circular function of the true value, establishing an error correction model and compensating with the error correction mode. The shape of the hollow cylinder as the standard object is simple so that the machining accuracy can be guaranteed; the height of the cylinder is equal to a scan height, so that the multiple-sensor point cloud registration errors in the whole scan area can be effectively corrected; a correction parameter can be obtained according to a global error law of each layer and is unrelated to the position of an object to be detected, so that the multiple-sensor point cloud registration error of an object in any position within the whole scan area can be effectively corrected, and therefore, the method is very suitable for the laser three-dimensional human body scanner field. A correction value obtained by the method is capable of effectively reducing the error of a sectional fitting size.

Description

technical field [0001] The invention relates to an error correction method. In particular, it relates to a correction method for multi-sensor point cloud splicing errors applied in laser three-dimensional scanning. Background technique [0002] Three-dimensional digital technology converts the information of real objects into digital information that can be directly processed by computers. Through the establishment of various 3D measurement theories and algorithms to process and analyze these information, and finally reconstruct the digital model of three-dimensional objects in space. With the rapid development of digital technology and computer technology, 3D digital models have important application value and broad development prospects in product design and manufacturing, virtual reality, reverse engineering, ergonomics and other fields. [0003] The laser 3D scanning system with 3D digitization as the core converts the measured object into a collection of point data, ca...

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Application Information

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IPC IPC(8): G01B11/24
Inventor 葛宝臻杨玉杰田庆国魏耀林
Owner TIANJIN UNIV
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