Surface profilometry and projector calibration based on multi-period structured light
碩士 === 國立中興大學 === 機械工程學系所 === 104 === In the visual system, two-dimensional image is obtain by camera. But it still lack depth information between image and object. If it can get depth (Z) information and point data (x, y) of two-dimensional plane. Then can draw three-dimensional picture to apply in...
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ndltd-TW-104NCHU53110612017-10-29T04:35:13Z http://ndltd.ncl.edu.tw/handle/81270425690764192766 Surface profilometry and projector calibration based on multi-period structured light 運用多週期結構光進行曲面輪廓量測及投影機校正 Yu-Tung Chen 陳昱佟 碩士 國立中興大學 機械工程學系所 104 In the visual system, two-dimensional image is obtain by camera. But it still lack depth information between image and object. If it can get depth (Z) information and point data (x, y) of two-dimensional plane. Then can draw three-dimensional picture to apply in reverse engineering three-dimensional reconstruction. In this study, we build a non-contact optical system by two cameras and a projector. Produce multi-period structured light by computer, then projected onto the object and captured by two cameras. Phase unwrapping based on four-step phase-shifting and multi-period structured light. If got absolute phase, corresponding the absolute phase of the object and camera pixel coordinates. Will know the relationship between point data (x, y) and three-dimensional coordinates. Connected three-dimensional coordinate and point data can be a linear equation passing through the origin of the camera. It can find the projected light plane equation by absolute phase. Calculating the intersection point of the projected light plane equation and the linear equation is the three-dimensional coordinate. The camera and the projector need to calibration before calculating the intersection point. Coordinate system transformation by internal and external parameters. Undistorted image by distortion parameters. Calibration the linear brightness system is one of important. If the projector output brightness and the camera input brightness is nonlinear, when calculating the absolute phase will error. 李吉群 2016 學位論文 ; thesis 69 zh-TW |
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碩士 === 國立中興大學 === 機械工程學系所 === 104 === In the visual system, two-dimensional image is obtain by camera. But it still lack depth information between image and object. If it can get depth (Z) information and point data (x, y) of two-dimensional plane. Then can draw three-dimensional picture to apply in reverse engineering three-dimensional reconstruction.
In this study, we build a non-contact optical system by two cameras and a projector. Produce multi-period structured light by computer, then projected onto the object and captured by two cameras. Phase unwrapping based on four-step phase-shifting and multi-period structured light. If got absolute phase, corresponding the absolute phase of the object and camera pixel coordinates. Will know the relationship between point data (x, y) and three-dimensional coordinates. Connected three-dimensional coordinate and point data can be a linear equation passing through the origin of the camera. It can find the projected light plane equation by absolute phase. Calculating the intersection point of the projected light plane equation and the linear equation is the three-dimensional coordinate.
The camera and the projector need to calibration before calculating the intersection point. Coordinate system transformation by internal and external parameters. Undistorted image by distortion parameters. Calibration the linear brightness system is one of important. If the projector output brightness and the camera input brightness is nonlinear, when calculating the absolute phase will error.
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author2 |
李吉群 |
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李吉群 Yu-Tung Chen 陳昱佟 |
author |
Yu-Tung Chen 陳昱佟 |
spellingShingle |
Yu-Tung Chen 陳昱佟 Surface profilometry and projector calibration based on multi-period structured light |
author_sort |
Yu-Tung Chen |
title |
Surface profilometry and projector calibration based on multi-period structured light |
title_short |
Surface profilometry and projector calibration based on multi-period structured light |
title_full |
Surface profilometry and projector calibration based on multi-period structured light |
title_fullStr |
Surface profilometry and projector calibration based on multi-period structured light |
title_full_unstemmed |
Surface profilometry and projector calibration based on multi-period structured light |
title_sort |
surface profilometry and projector calibration based on multi-period structured light |
publishDate |
2016 |
url |
http://ndltd.ncl.edu.tw/handle/81270425690764192766 |
work_keys_str_mv |
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