Multi-line array laser three-dimensional scanning system and method

Abstract

The invention provides a multi-line array laser three-dimensional scanning system and method. Accurate synchronism and logic control of the multi-line array laser three-dimensional scanning system can be achieved through an FPGA, a line laser unit array serves as a projection pattern light source, trigger signals are sent to a stereoscopic vision image sensor and the line laser unit array through the FPGA, an upper computer receives image pairs shot by the stereoscopic vision image sensor, laser line array patterns in the image pairs are subjected to encoding, decoding and three-dimensional reconstruction, three-dimensional reconstruction and matching alignment of three-dimensional feature points between different moments are conducted on surface feature points of an object to be measured, and matching calculation is subjected to prediction and error correction through an optical tracking technology. The system and method are used for registration and connection of time domain laser three-dimensional scanning data, meanwhile, measuring error grades are evaluated in real time and fed back to an error feedback controller for adjusting indication, and therefore laser three-dimensional scanning with low cost and high efficiency, reliability and accuracy is completed accordingly.

Description

technical field [0001] The invention relates to the technical field of three-dimensional scanning of object surface geometry, in particular to a multi-line array laser three-dimensional scanning system and a multi-line array laser three-dimensional scanning method. Background technique [0002] In recent years, 3D scanning, as a fast 3D digital technology, has been increasingly used in various fields, including reverse engineering, industrial inspection, computer vision, CG production, etc., especially in the current rapidly developing 3D printing and intelligent manufacturing. In the field of 3D scanning, as a front-end 3D digitization and 3D visual sensing technology, it has become an important part of the industry chain; at the same time, various applications have raised the bar in many aspects such as the cost, practicability, accuracy and reliability of 3D scanning equipment. higher requirement. [0003] Optical 3D scanning is the most common modern technical means in ...

AI Technical Summary

Problems solved by technology

The traditional marker point splicing technology has the problem of high false splicing rate. The performance is that the data of multiple scans is ambiguous when they are uniformly registered to the same coordinate system, which leads to the fact that a certain piece of scanned data is separated from the overall data and generates an incorrect model.

This problem can be solved by manually deleting after each single-sided scan in white light 3D scanning, but it cannot be solved by similar methods in laser 3D scanning in continuous scanning mode, so rescanning is usually required after misalignment , which greatly affects work efficiency

[0008] Low scanning accuracy

The quality of laser scanning data is related to many factors, among which the working distance control is an important factor. In the case of a certain depth of field, if the working distance changes beyond the depth of field, the image will be blurred, resulting in large data noise and greatly reduced accuracy.

In the traditional laser scanning technology, the working distance mainly depends on the subjective judgment of the operator. It is difficult to accurately control the working distance during the continuous scanning process, resulting in low scanning accuracy.

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