Method of and apparatus for measuring track displacement on a ma

Details Method of and apparatus for measuring track displacement on a ma Method of and apparatus for measuring track displacement on a ma

1991-01-25

1992-08-25

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 1, 358106, 358107, G06K 900

Patent

active

051425882

ABSTRACT:
The amount of displacement of a track recorded on a magnetic tape from the linear state is analyzed by using an image analysis apparatus, and a two-dimensional distribution state of the displacement state is displayed, so that a difference in the displacement state due to the position on the magnetic tape can be known, while the changes in the longitudinal direction of the magnetic tape or the variation state of the displacement in the time course can be obtained.

REFERENCES:
patent: 4638388 (1987-01-01), Hara
patent: 4853967 (1989-08-01), Mandeville
Liang et al., "Direct Determination of Flexural Strains in Plates Using Projected Gratings," VDI-Berichte Nr. 313, 1978, pp. 401-405.
Hamano, English Abstract for Japanese No. 57-122308, from A.P.S.
"Application of Moire Analysis of Strain Using Fourier Transform", Yoshiharu Morimoto et al., Optical Engineering, Aug. 1988, vol. 27, No. 8, pp. 650-656.
"Strain Measurement by Scanning-Moire Method", Yoshiharu Morimoto et al., Bulletin of JSME, vol. 27, No. 233, Nov. 1984, pp. 200-205.

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