Abstract

The information content of a contour map is calculated and compared with the information required for determining the relative position of the contours. We have found that usually the information required for arranging the contours in the right order is small as compared with that of producing the map. To demonstrate this finding we introduce two novel methods for ordering the contours. The first makes use of two colors, double exposure, moiré mapping. The second analyzes the relative motion of hills and valleys, while the relative angle of two transparencies photographed in the grid projection technique is changed.

© 1980 Optical Society of America

Moiré Contour-Sum Contour-Difference, and Vibration Analysis of Arbitrary Objects

J. Der Hovanesian and Y. Y. Hung
Appl. Opt. 10(12) 2734-2738 (1971)

Vibration analysis of plates by a time-averaged projection-moiré method

Reinhold Ritter and Hans-Juergen Meyer
Appl. Opt. 19(10) 1630-1633 (1980)

Three-map absolute moiré contouring

Xinjun Xie, John T. Atkinson, Michael J. Lalor, and David R. Burton
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Contouring of diffused objects using lensless Fourier transform digital moiré holography

Md. Mosarraf Hossain, Gyanendra Sheoran, Varun Kumar, and Chandra Shakher
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Optical Contour Mapping of Surfaces

W. Jaerisch and G. Makosch
Appl. Opt. 12(7) 1552-1557 (1973)