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Quick large-range phase unwrapping method based on double reference planes

A reference plane and unwrapping technology, which is applied in the field of fast and large-scale phase unwrapping, can solve problems such as the limitations of 3D measurement, and achieve the effect of improving reconstruction speed, accuracy and measurement speed.

Active Publication Date: 2020-08-11
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the above analysis, it can be seen that for the existing phase unwrapping method technology based on a single reference plane, it has limitations in the three-dimensional measurement of large-scale moving objects

Method used

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  • Quick large-range phase unwrapping method based on double reference planes
  • Quick large-range phase unwrapping method based on double reference planes
  • Quick large-range phase unwrapping method based on double reference planes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Two independent statues move within the range of the farthest reference plane and the nearest reference plane. In the experimental measurement, the statues move from the farthest reference plane to the nearest reference plane. The proposed adaptive pixel-by-pixel unwrapping algorithm is used to reconstruct the three-dimensional shape of two independent sculptures at three spatial positions during the movement. The algorithm flow is the same for each location, the specific steps are:

[0055] (1) Determine the spatial range that needs to be measured, use phase profilometry to obtain the wrapped phases of the nearest reference plane and the farthest reference plane respectively, and use the time unwrapping method to obtain the absolute phase maps of the two reference planes, respectively. Φ F And Φ B ; Simultaneously process the fringe projection image of the farthest reference plane to obtain the modulation projection image of the farthest reference plane I B .

[0056] (2) ...

Embodiment 2

[0063] Restore the dynamic three-dimensional shape of the free palm when it is far away from the measurement system. Use the algorithm proposed by the present invention for processing, such as image 3 As shown, the reconstruction result of the palm part is displayed. Although the hand moves in a large depth range, the three-dimensional surface profile can be accurately and clearly obtained throughout the process.

Embodiment 3

[0065] The dynamic three-dimensional shape of the cover with complex edge features when it is far away from the measurement system is restored. Using the algorithm proposed by the present invention for processing, the relevant three-dimensional reconstruction model such as Figure 4 As shown, the dynamic measurement results show that the method of the present invention is suitable for high-speed three-dimensional shape measurement of any freely moving object in a large depth measurement range.

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Abstract

The invention discloses a quick large-range phase unwrapping method based on double reference planes, which comprises the following steps of: (1) determining a spatial range to be measured, respectively obtaining wrapping phases of a nearest reference plane and a farthest reference plane by using a phase profilometry according to a sequence, and unwrapping absolute phase diagrams of the two reference planes by using a time unwrapping method; (2) calculating a wrapping phase diagram and a modulation projection diagram of the object; (3) unpacking the wrapped phase of the object by using the absolute phase diagram of the farthest reference plane to obtain a candidate absolute phase diagram of the object; (4) edge detection is carried out on the candidate phase diagram and the modulation projection diagram of the object, and unwrapping is classified; (5) for the unwrapping failure class, providing an unwrapping phase reference for the unwrapping failure class by generating a virtual adaptive reference plane phase, and converting an unwrapping phase diagram into an unwrapping ambiguity class; and (6) correcting the absolute phase diagram to obtain a real absolute phase diagram. The method is suidesk for high-speed three-dimensional structured light reconstruction of large-range moving objects.

Description

Technical field [0001] The invention relates to the field of high-speed three-dimensional reconstruction, in particular to a method for fast and large-range phase unwrapping based on dual reference planes. Background technique [0002] High-speed 3D reconstruction technology overcomes the limitations of 2D image expression, fully displays the 3D shape and texture characteristics of spatial dynamic objects, restores the true state of space objects, and enhances the spatial three-dimensional sense of dynamic objects. The high-speed 3D reconstruction of dynamic objects has important application value. Time phase unwrapping and space phase unwrapping are currently the two most important methods of unwrapping phase in the field of 3D reconstruction; time unwrapping methods need to add a large number of projection patterns to determine the absolute phase map, which greatly reduces the effectiveness of 3D reconstruction Frame rate; The spatial unwrapping method relies on the gradient o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/55G06T17/00G01B11/25
CPCG06T7/55G06T17/00G01B11/254
Inventor 金一段明辉郑亚兵孙正陈恩红吕盼稂
Owner UNIV OF SCI & TECH OF CHINA