CONTRAST-IMPROVED JOINT TRANSFORM CORRELATOR USING SPATIAL LIGHT MODULATORS

When real time optical pattern recognition is carried out by means of spatial light modulators, a practical situation may arise in which the size of the Fourier transform and the intensity of the light source a re fixed. Then, provided the input scene and the size of the spatial l ight modulator allow it, an interesting possibility for improving the overall intensity in the Fourier plane is the replication of the scene , either along a regular lattice structure or a random replication. In this work we analyse the usefulness of these methods, both to obtain diffraction images or cross-correlation between images in a joint tran sform correlator. Copyright (C) 1996 Elsevier Science Ltd.