Corresponding point searching method based on phase shift and trifocal tensor

A corresponding point and phase shift technology, applied in the direction of measuring devices, image analysis, instruments, etc., can solve the problems of inability to achieve full spatial resolution three-dimensional surface measurement, poor accuracy of measurement data, and inability to measure objects with discontinuous surfaces

Active Publication Date: 2013-09-11
HUAZHONG UNIV OF SCI & TECH
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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 accu

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  • Corresponding point searching method based on phase shift and trifocal tensor
  • Corresponding point searching method based on phase shift and trifocal tensor
  • Corresponding point searching method based on phase shift and trifocal tensor

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Embodiment Construction

[0040] The three-dimensional measurement technology of dynamic objects based on surface structured light uses industrial cameras to collect high-speed synchronous structured light images that are deformed by the modulation of the surface of the measured object, and then calculates the measured object from the image containing the three-dimensional topography information of the measured object surface 3D shape data. During the measurement process, 3D reconstruction using captured grating images is one of the key technologies for dynamic object measurement, which usually includes four steps: phase unraveling, phase unwrapping, stereo matching and 3D reconstruction. Among them, the phase dephasing is to use the principle of phase shift to calculate the relative phase value of each pixel, which has 2π discontinuity due to the number of gratings in the measurement space, so the phase unwrapping algorithm is usually used to calculate the phase value of the image point The absolute p...

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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...

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Application Information

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IPC IPC(8): G01B11/24G06T7/00
Inventor 李中伟钟凯史玉升伍梦琦
Owner HUAZHONG UNIV OF SCI & TECH
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