title: Scale and projection invariant pattern recognition.
abstract: A logarithmic-logarithmic coordinate transformation is used to perform successfully scale and projection (tilt) invariant optical pattern recognition. The coordinate transformation is achieved optically using a computer generated hologram divided into four different quadrants since the logarithmic function does not exist for negative values of the argument. The transformed pattern is introduced into a VanderLugt correlator setup through a liquid crystal light valve. Initial experimental results are presented.
authors.forename: D
authors.initials: D
authors.lastname: Mendlovic
authors.forename: N
authors.initials: N
authors.lastname: Konforti
authors.forename: E
authors.initials: E
authors.lastname: Marom