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Three-dimensional reconstruction system calibration method based on multi-frequency structured light

A 3D reconstruction and system calibration technology, applied in the field of optical inspection, can solve problems such as low efficiency and cumbersome calibration process

Active Publication Date: 2019-12-20
FOSHAN NANHAI GUANGDONG TECH UNIV CNC EQUIP COOP INNOVATION INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is necessary to use a projector to project the image of the reference calibration plate for comparison with the calibration plate template, and it is required to change the position of the template to collect multiple images. The calibration process is cumbersome and inefficient.

Method used

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  • Three-dimensional reconstruction system calibration method based on multi-frequency structured light
  • Three-dimensional reconstruction system calibration method based on multi-frequency structured light
  • Three-dimensional reconstruction system calibration method based on multi-frequency structured light

Examples

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Embodiment 1

[0091] Such as Figure 1 to Figure 7 As shown, this embodiment discloses a calibration method for a 3D reconstruction system based on multi-frequency structured light. The 3D reconstruction system includes a loading platform, a fastening bracket that can move up and down, and rotate left and right, and an X-axis The slide rail, the Y-axis slide rail on the bracket, the grating projector installed on the Y-axis slide rail, the camera installed on the X-axis slide rail, and the acquisition device connected with the camera, the calibration method specifically includes the following steps :

[0092] Step S1: Initialize the device: adjust the height of the fastening bracket to change the object distance of the camera; adjust the focal length of the camera lens to make the object under test image clearly; adjust the position, angle and focal length of the projector to make it appear clear, Complete like.

[0093] Step S2: Prepare the calibration board: This system uses a circular ...

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Abstract

The invention discloses a three-dimensional reconstruction system calibration method based on multi-frequency structured light. The calibration method comprises the following steps of step S1, initializing equipment; step S2, preparing a calibration board; step S3, acquiring a calibration image; step S4, calibrating a camera; step S41, determining kp0; step S42, determining kp1 and kp2; step S43,determining kp3 and kp4; step S44, searching the remaining of small circles; step S5, calibrating a projector; step S51, generating a G matrix by using a calibration board white-light chart; step S52,unwrapping phase; step S521, acquiring a grating projection chart; step S522, unwrapping the phase; step S523, iteratively computing to obtain the finest stripe absolute phase; step S53, solving parameter; and step S6, ending. The calibration method provided by the invention has the advantages of being simple in calibration process, high in accuracy, strong in practicability, convenient to use and low in cost.

Description

technical field [0001] The invention relates to the technical field of optical detection, in particular to a calibration method for a three-dimensional reconstruction system based on multi-frequency structured light. Background technique [0002] The system calibration algorithm is one of the key steps in 3D shape measurement. In the early days, people used special precision equipment to calibrate the 3D shape measurement equipment. For example, the article "Implementation and experimental study on fast object modeling based on multiple structured stripes" used two Calibrate equipment with calibration plates perpendicular to each other; or use three vertical plane calibration plates to calibrate measurement equipment; or use precise calibration blocks to calibrate the system. All of the above require the use of elaborate calibration equipment to complete system calibration, which is expensive, costly, and inefficient. [0003] Zhang Zhengyou proposed a planar camera calibra...

Claims

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Application Information

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IPC IPC(8): G01B11/25
CPCG01B11/254
Inventor 王华龙李凡毛骁
Owner FOSHAN NANHAI GUANGDONG TECH UNIV CNC EQUIP COOP INNOVATION INST
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