Automated 3D Measurement of Shape and Strain Distribution Using Fourier Transform Grid Method

Yoshiharu MORIMOTO; Li TANG; Yasuyuki SEGUCHI

Automated 3D Measurement of Shape and Strain Distribution Using Fourier Transform Grid Method

Yoshiharu MORIMOTO, Li TANG, Yasuyuki SEGUCHI

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The Fourier transform grid methos (FTGM) had been proposed previously by the authors for measuring in-plane strain distibution. In this paper, two automated grid methods are proposed using the FTGM. One is a method for measuring the shape of the full surface of a cylindrical object. A new forming grid method is proposed for introducing the FTGM into the slit projection method. In order to measure the full surface of the object, the object is rotated by a constant angle, the projected line is recorded and the line image is shifted by a constant number of pixels. The next recorded projected line is superimposed in the same image memory. By repeating the above operation, a grating image is formed in the image memory. The formed grating iemage is precisely analyzed at once by the FTGM. The other is a shape and strain measurement method for a curved plate. In the conventional automated grid method, because the position of a grid point is exprssed by an integer number of pixels, it is difficult to use for accurate measurement. Using the FTGM, the position of the grating is measured by the decimal number of pixels by analyzing the phase distribution. The accuracy is higher. Moreover, since each pixel point has a phase, matching for corresponding points between different images is easily performed by comparing the phases of the points. Two applications for medical and mechanical experiments are presented.

Publication: IEICE TRANSACTIONS on Information Vol.E74-D No.10 pp.3459-3466

Publication Date: 1991/10/25

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Type of Manuscript: Special Section PAPER (Special Issue on Computer Vision and Its Applications)

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Yoshiharu MORIMOTO
Li TANG
Yasuyuki SEGUCHI

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Yoshiharu MORIMOTO, Li TANG, Yasuyuki SEGUCHI, "Automated 3D Measurement of Shape and Strain Distribution Using Fourier Transform Grid Method" in IEICE TRANSACTIONS on Information, vol. E74-D, no. 10, pp. 3459-3466, October 1991, doi: .
Abstract: The Fourier transform grid methos (FTGM) had been proposed previously by the authors for measuring in-plane strain distibution. In this paper, two automated grid methods are proposed using the FTGM. One is a method for measuring the shape of the full surface of a cylindrical object. A new forming grid method is proposed for introducing the FTGM into the slit projection method. In order to measure the full surface of the object, the object is rotated by a constant angle, the projected line is recorded and the line image is shifted by a constant number of pixels. The next recorded projected line is superimposed in the same image memory. By repeating the above operation, a grating image is formed in the image memory. The formed grating iemage is precisely analyzed at once by the FTGM. The other is a shape and strain measurement method for a curved plate. In the conventional automated grid method, because the position of a grid point is exprssed by an integer number of pixels, it is difficult to use for accurate measurement. Using the FTGM, the position of the grating is measured by the decimal number of pixels by analyzing the phase distribution. The accuracy is higher. Moreover, since each pixel point has a phase, matching for corresponding points between different images is easily performed by comparing the phases of the points. Two applications for medical and mechanical experiments are presented.
URL: https://global.ieice.org/en_transactions/information/10.1587/e74-d_10_3459/_p

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@ARTICLE{e74-d_10_3459,
author={Yoshiharu MORIMOTO, Li TANG, Yasuyuki SEGUCHI, },
journal={IEICE TRANSACTIONS on Information},
title={Automated 3D Measurement of Shape and Strain Distribution Using Fourier Transform Grid Method},
year={1991},
volume={E74-D},
number={10},
pages={3459-3466},
abstract={The Fourier transform grid methos (FTGM) had been proposed previously by the authors for measuring in-plane strain distibution. In this paper, two automated grid methods are proposed using the FTGM. One is a method for measuring the shape of the full surface of a cylindrical object. A new forming grid method is proposed for introducing the FTGM into the slit projection method. In order to measure the full surface of the object, the object is rotated by a constant angle, the projected line is recorded and the line image is shifted by a constant number of pixels. The next recorded projected line is superimposed in the same image memory. By repeating the above operation, a grating image is formed in the image memory. The formed grating iemage is precisely analyzed at once by the FTGM. The other is a shape and strain measurement method for a curved plate. In the conventional automated grid method, because the position of a grid point is exprssed by an integer number of pixels, it is difficult to use for accurate measurement. Using the FTGM, the position of the grating is measured by the decimal number of pixels by analyzing the phase distribution. The accuracy is higher. Moreover, since each pixel point has a phase, matching for corresponding points between different images is easily performed by comparing the phases of the points. Two applications for medical and mechanical experiments are presented.},
keywords={},
doi={},
ISSN={},
month={October},}

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TY - JOUR
TI - Automated 3D Measurement of Shape and Strain Distribution Using Fourier Transform Grid Method
T2 - IEICE TRANSACTIONS on Information
SP - 3459
EP - 3466
AU - Yoshiharu MORIMOTO
AU - Li TANG
AU - Yasuyuki SEGUCHI
PY - 1991
DO -
JO - IEICE TRANSACTIONS on Information
SN -
VL - E74-D
IS - 10
JA - IEICE TRANSACTIONS on Information
Y1 - October 1991
AB - The Fourier transform grid methos (FTGM) had been proposed previously by the authors for measuring in-plane strain distibution. In this paper, two automated grid methods are proposed using the FTGM. One is a method for measuring the shape of the full surface of a cylindrical object. A new forming grid method is proposed for introducing the FTGM into the slit projection method. In order to measure the full surface of the object, the object is rotated by a constant angle, the projected line is recorded and the line image is shifted by a constant number of pixels. The next recorded projected line is superimposed in the same image memory. By repeating the above operation, a grating image is formed in the image memory. The formed grating iemage is precisely analyzed at once by the FTGM. The other is a shape and strain measurement method for a curved plate. In the conventional automated grid method, because the position of a grid point is exprssed by an integer number of pixels, it is difficult to use for accurate measurement. Using the FTGM, the position of the grating is measured by the decimal number of pixels by analyzing the phase distribution. The accuracy is higher. Moreover, since each pixel point has a phase, matching for corresponding points between different images is easily performed by comparing the phases of the points. Two applications for medical and mechanical experiments are presented.
ER -