Scale and projection invariant pattern recognition.
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.
Mendlovic
D
D
Konforti
N
N
Marom
E
E