Bipolar incoherent optical pattern recognition by carrier encoding

In the present paper, Lohmann's (1968) modulation technique is applied to the case of optical pattern recognition. Current interest in optical pattern recognition is motivated by the lower optical quality requirements (particularly, phase errors) and positional tolerances on the components of such systems. Attention is focused on incoherent optical processors which use carrier encoding to achieve bipolar operations. The use of these processors in optical pattern recognition is discussed and experimentally demonstrated.