Three-dimensional contour measuring method based on structured light field imaging

A 3D contour and light field imaging technology, applied in the field of 3D imaging, can solve problems such as loss of light information, difficulty in real-time measurement, and poor accuracy of 3D reconstruction

Active Publication Date: 2019-03-22
INST OF MEDICAL DEVICES (SUZHOU) SOUTHEAST UNIV
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Problems solved by technology

Phase measurement profilometry is characterized by high precision, but it is difficult to achieve real-time measurement, while traditional unwrapping algorithms: genetic algorithm, multi-frequency heterodyne, etc., these algorithms cannot realize real-time me...

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  • Three-dimensional contour measuring method based on structured light field imaging
  • Three-dimensional contour measuring method based on structured light field imaging
  • Three-dimensional contour measuring method based on structured light field imaging

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Embodiment Construction

[0036] see figure 1 , with reference to the embodiment, the light field camera used is Lytro Illum, the angle resolution is 15×15 pixels, and the position resolution is 434×625 pixels. Its structure is as figure 2 As shown, the light field camera is mainly composed of a main lens, a microlens array, and a CCD sensor. s is the s-axis coordinate of the sub-aperture on the main lens, x is the x-axis coordinate of the center of the microlens, and d is the diameter of a microlens. D is the distance between adjacent sub-apertures, h m ' is the distance from the plane where the main lens is located to the plane where the microlens array is located, h m is the distance from the plane where the main lens is located to the conjugate plane of the plane where the microlens array is located, and b is the distance from the plane where the microlens array is located to the plane where the CCD sensor is located. The projector used is BENQ GP1 with a resolution of 600×800 pixels. The proj...

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Abstract

A three-dimensional contour measuring method based on structured light field imaging is characterized by including the steps that an imaging system composed of a light field camera and a projector isestablished, the projector projects an original coding grating to a to-be-measured object, the light field camera shoots a coding grating image obtained after being subjected to contour modulation ofthe to-be-measured object, and the coding grating image which is shot by the light field camera and is subjected to contour modulation of the to-be-measured object is decoded, and three-dimensional reconstruction is carried out on the contour of the object according to the information obtained after decoding; a three-dimensional contour measurement problem is summarized into three equations for solving three unknown numbers containing object point three-dimensional coordinates, wherein after the imaging system is calibrated, two equations are determined by using the process that the to-be-measured object is imaged in a center sub-aperture image in the light field camera, the third equation is determined by using the decoded image information, and three-dimensional contour measurement is achieved by solving an equation set formed by the three equations.

Description

technical field [0001] This paper involves 3D imaging technology, especially a 3D profile measurement method based on structured light field imaging, which can be used in many fields such as automation, industrial inspection, and medical inspection. Background technique [0002] Three-dimensional profile measurement technology is divided into contact and non-contact measurement, and non-contact measurement is divided into active measurement and passive measurement. Active measurement methods include structured light, laser triangulation, etc. Among them, phase measurement profilometry is a three-dimensional profilometry technology based on the structured light method. This technology first projects a structured grating onto the surface of the object, and secondly uses a traditional camera to capture the grating fringe pattern modulated by the surface contour of the object, and then conducts the grating fringe pattern The wrapped phase is obtained through processing, the unw...

Claims

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Application Information

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IPC IPC(8): G01B11/24
CPCG01B11/24
Inventor 周平于云雷张玉婷
Owner INST OF MEDICAL DEVICES (SUZHOU) SOUTHEAST UNIV
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