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Highly Accurate 3-D Position Measurement and Non-Linear Coordinate TransformationFormat | Member Price | Non-Member Price |
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Paper Abstract
An important preprocess in computer vision is
to measure the position of an object and to eradicate
lens distortion which hampers the recognition of an
object from its image. At first, the slit-ray projection
method is investigated and some ideas for increasing
measurement accuracy are proposed. A regression to
normal distribution is achieved by the least squares
method for the pixel positions and their intensities.
Because of this, the slit-ray center position can be
determined with a high accuracy of 0.05 pixel. A
method for correcting the distortion of the slit-ray
intensity caused by non-uniform reflection is
described. It involves compensating the intensity on the
basis of a uniform reference light. Optimum
measurement conditions for the slit-ray width and the
regression range are obtained by examining the
relation between intensity fluctuations and
measurement error. In order to increase 3-D
measurement accuracy, methods for calibrating
various parameters are described. Next, by combining
three ideas, i.e., the reference of the shift quantities,
the en bloc processing of pixel groups and the
separation of the transformation into two directions,
non-linear coordinate transformation time is reduced.
This is effective for the speedy correction of image
distortion.
Paper Details
Date Published: 1 November 1989
PDF: 10 pages
Proc. SPIE 1199, Visual Communications and Image Processing IV, (1 November 1989); doi: 10.1117/12.970077
Published in SPIE Proceedings Vol. 1199:
Visual Communications and Image Processing IV
William A. Pearlman, Editor(s)
PDF: 10 pages
Proc. SPIE 1199, Visual Communications and Image Processing IV, (1 November 1989); doi: 10.1117/12.970077
Show Author Affiliations
Hiroshi Naruse, Nippon Telegraph and Telephone Corporation (Japan)
Yoshihiko Nomura, Nippon Telegraph and Telephone Corporation (Japan)
Yoshihiko Nomura, Nippon Telegraph and Telephone Corporation (Japan)
Michihiro Sagara, Nippon Telegraph and Telephone Corporation (Japan)
Published in SPIE Proceedings Vol. 1199:
Visual Communications and Image Processing IV
William A. Pearlman, Editor(s)
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