Method for correcting multiple-sensor point cloud registration errors

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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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 and quickly

Although the latter two methods have simple standard objects, they can only establish the relationship between the scanning depth, angle and error of a single line laser scanner, and cannot correct the errors between multiple scanners or sensors.

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