Abstract

The VanderLugt optical correlator has been widely used for pattern recognition purposes in research laboratories since the early 1960s. However, this correlator has not been extensively used in real-world applications because the photographic process required to produce a holographic matched filter limits real-time applications. Furthermore, multiple exposures are necessary for the recognition of an image which has a different orientation or scale from the original input image used to produce the matched filter. Sequentially stepping through a bank of matched filters for the identification of an image at various orientations and scales has been proposed but is difficult to implement optically.

© 1988 Optical Society of America