A technique observing contour lines of an object by the use of moiré is developed. Shadow of an equispaced plane grating is projected onto an object by a point source and observed through the grating. The resulting moiré is a contour line system showing equal depth from the plane of grating if the light source and the observing point lie on a plane parallel to the grating. A technique to wash away the unwanted aliasing moiré optimization of contour line spacing and visibility and the results of the application are described.
© 1970 Optical Society of AmericaFull Article | PDF Article
Bernard W. Bell and Chris L. Koliopoulos
Opt. Lett. 9(5) 171-173 (1984)
D. M. Meadows, W. O. Johnson, and J. B. Allen
Appl. Opt. 9(4) 942-947 (1970)
Appl. Opt. 12(4) 845-850 (1973)