Hand-held three-dimensional real-time scanning method

Abstract

The invention provides a hand-held three-dimensional real-time scanning method. The method comprises steps that (1), a measurement angle of a measured object is selected, and an adjacent angle superposition rate is made to be greater than 60%; (2), a measurement mode is selected, and inching measurement or continuous measurement is carried out; (3), the exposure time of a camera is adjusted according to the information of different-angle illumination and reflectivity; (4), scanning measurement is carried out by the camera according to the selected measurement mode and the selected measurement angle, namely shooting; (5), the three frequency colorful phase shift profilometry and a colorful stripe decoupling method are employed to acquire three-dimensional point cloud and a texture graph of each angle; and (6), the acquired different-angle three-dimensional point cloud acquired in the step (5) are spliced to be an integral model. The method is advantaged in that the method is applicable to most measurement objects, especially dynamic objects, the method needs no artificial mark points, and a multi-angle measurement splicing problem can be excellently solved.

Description

Technical field [0001] The invention relates to the field of optical detection, and in particular to a full-field fast three-dimensional measurement method based on a novel multi-angle splicing method. Background technique [0002] Some of the portable scanners currently on the market are small and easy to carry. However, each measurement requires multiple frames of continuous exposure to collect the deformed fringe image before the 3D point cloud can be reconstructed. The general operation method is: select the location, Fix instrument, measure, move position, fix, measure. This working method has low measurement efficiency and cannot realize handheld continuous scanning, and is especially not suitable for scanning dynamic objects. There are also some portable scanners. Although handheld scanning can be used with the help of stereo vision technology, it is necessary to place markers on the object to be measured before measurement, resulting in low measurement efficiency, heavy ...

AI Technical Summary

Problems solved by technology

On the one hand, splicing can be achieved by calibrating the position of the scanner or the position of the measured object for multiple measurements, but the calibration requires auxiliary equipment, such as a translation stage, which not only increases the cost but also limits the applicable occasions

On the other hand, by pasting some mark points on the surface of the measured object to assist splicing, the measurement period will be longer and the measurement will be complicated.

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