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Your search keyword '"Zhao, Wenyi"' showing total 4 results
Start Over Author "Zhao, Wenyi" Topic bundle adjustment
4 results on '"Zhao, Wenyi"'

1. Positioning error calibration for two-dimensional precision stages via globally optimized image registration.

Author

Wang, Jian, Zhao, Wenyi, Leach, Richard, Xu, Long, Lu, Wenlong, and Liu, Xiaojun

Subjects
*IMAGE registration, *COORDINATE measuring machines, *CALIBRATION, *MEASUREMENT errors, *ALGORITHMS, *KEY performance indicators (Management)
Abstract

• We developed a cost-effective method for precision 2D stage error calibration. • Images of an arbitrarily textured plane are captured and analysed in the method. • A modified bundle adjustment algorithm was developed for global optimisation. • 3 μm accuracy within a 100 mm range was demonstrated using experiments. Positioning errors are a primary performance indicator of precision stages. Calibration of stage positioning errors usually requires expensive, specialised instruments or artefacts. In this paper, we introduce a simple and cost-effective, machine vision-based method for stage error calibration. The novelty is that we used an arbitrarily textured plane, for example an array of coins, as the imaging target, as opposed to costly precision machined artefacts. Positioning errors were extracted from overlapped texture images using a fast and globally optimised feature-matching algorithm. A computer simulation demonstrates that the method is accurate and numerically stable in terms of sensing noise. Trials with a coordinate measuring machine reveal that the method can achieve sub-pixel accuracy, with a maximum measurement error of approximately 3 μm within a 100 mm range. [ABSTRACT FROM AUTHOR]

Published
2021
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2. Integrating Multiple Visual Cues for Robust Real-Time 3D Face Tracking

Author

Liao, Wei-Kai, Fidaleo, Douglas, Medioni, Gérard, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Zhou, S. Kevin, editor, Zhao, Wenyi, editor, Tang, Xiaoou, editor, and Gong, Shaogang, editor

Published
2007
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3. Person-Independent Monocular Tracking of Face and Facial Actions with Multilinear Models

Author

Sugano, Yusuke, Sato, Yoichi, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Zhou, S. Kevin, editor, Zhao, Wenyi, editor, Tang, Xiaoou, editor, and Gong, Shaogang, editor

Published
2007
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4. An Investigation of Model Bias in 3D Face Tracking

Author

Fidaleo, Douglas, Medioni, Gérard, Fua, Pascal, Lepetit, Vincent, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Zhao, Wenyi, editor, Gong, Shaogang, editor, and Tang, Xiaoou, editor

Published
2005
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