Combined three-dimensional digital imaging method of digital speckle projection and phase measuring profilometry

Abstract

The invention relates to a combined three-dimensional digital imaging method of digital speckle projection and phase measuring profilometry. The method comprises the following steps: (1), a random digital speckle pattern is projected onto an object and acquired through two cameras on left and right sides; (2), a sinusoidal fringe pattern is projected onto the object, and a corresponding sinusoidal fringe pattern is acquired; (3), the folded phase value of a coding fringe pattern is calculated; (4), a series of points (Pr1 to Prn) on the right camera corresponding to a point P1 on the left camera are searched according to the folded phase value; (5), the point Pr on the right camera corresponding to the point P1 is fixed in the position of P1 according to the acquired digital speckle pattern; (6), processes of the step (4) and (5) are performed to all points on the left and right cameras, to find all the corresponding point pairs; (7), the corresponding point pairs are re-established into three-dimensional point cloud data. The method has the advantages that the imaging speed is fast, small calculated amount, accurate result, and the method is suitable for the fields of on-line three-dimensional detection and dynamic three-dimensional data acquisition with higher accuracy and speed requirements.

Description

technical field [0001] The invention belongs to three-dimensional digital imaging and modeling technology, and mainly relates to a three-dimensional digital imaging method combining digital speckle projection and phase measurement profilometry. Background technique [0002] 3D Digital Imaging and Modeling (3DIM-3D Digital Imaging and Modeling) is an emerging interdisciplinary field that has been actively researched internationally in recent years. It is widely used in reverse engineering, cultural relics protection, medical diagnosis, industrial detection and virtual reality and many other aspects. As one of the main means of obtaining 3D information, the 3D active vision system based on phase measurement profilometry has the advantages of high precision, high resolution, non-contact, and full-field data acquisition, and has attracted extensive attention and research. The basic process of phase measurement profilometry is: (1) According to the collected fringe pattern, use ...

AI Technical Summary

Problems solved by technology

It has the advantages of fast acquisition speed and less influence by ambient light, but the disadvantage is that the algorithm has a large amount of calculation and the data accuracy is low

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