A Corresponding Point Finding Method Based on Phase Shift and Three-Look Tensor

Abstract

The invention belongs to the filed of dynamic object three-dimensional measurement and particularly relates to a corresponding point searching method based on phase shift and trifocal tensor. The method includes: using parallax constraints to remove error match points, optimizing grating boundary points, checking mixed consistency, using epipolar constraints to further improve corresponding point precision, and accordingly full-time-resolution and full-spatial-resolution three-dimensional measuring of dynamic objects is achieved. By the method, phase unwrapping is unnecessary during three-dimensional reconstruction, corresponding points of source match points are obtained by using trifocal tensor constraints directly, and surface discontinuity of an to-be-measured object needs not to be considered. In the mean time, data processing speed is increased due to the fact that the phase unwrapping is unnecessary, and real-time monitoring requirements of deformable objects are satisfied. The method is applicable to measuring of dynamic objects of optional shapes without using extra images to determine the corresponding points.

Description

technical field [0001] The invention belongs to the field of three-dimensional measurement of dynamic objects, and in particular relates to a method for searching corresponding points in the process of three-dimensional measurement of dynamic objects with arbitrary complex shapes. The method can directly search independently for the corresponding points of each pixel in a relative phase diagram. No phase unwrapping is required, so the method can realize the three-dimensional surface shape measurement of dynamic objects with full spatial resolution and full time resolution of any complex shape. Background technique [0002] At present, the three-dimensional surface shape measurement technology has been widely used in the fields of aerospace, weaponry and automobiles. Most of the core components in these fields (such as engine block and cylinder head, impeller blades, intake and exhaust pipes, etc.) have complex structures and irregular surfaces. In its design and manufacturin...

AI Technical Summary

Problems solved by technology

However, at present, when using the structured light method to perform 3D measurement of dynamic objects with complex shapes, there are certain problems whether using single or multiple images for 3D reconstruction

When using a single image for reconstruction, the accuracy of the measurement data is poor, the stability of the decoding algorithm needs to be improved, and it does not have full spatial resolution

If multiple images are used for reconstruction based on the three-step phase shift method, although the measurement accuracy is improved to a certain extent and the full spatial resolution is achieved, objects with discontinuous surfaces cannot be measured

To solve this problem, additional raster images need to be added on the basis of the three images, which slows down the measurement speed and cannot meet the requirements of real-time measurement

Therefore, the existing 3D reconstruction methods cannot realize the 3D surface shape measurement of dynamic objects with arbitrary complex shapes with full spatial resolution and full time resolution.

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