This is the second volume on "Optical Information Processing" within the scope of the US-USSR Science Cooperation Program co­ sponsored by the US National Science Foundation and the USSR Acad­ emy of Sciences Siberian Branch. Volume I was published in 1976, also by Plenum Press, and con­ tained the papers presented by a group of US and USSR scientists at the First US-USSR Science Cooperation Seminar "Optical Informa­ tion Processing" held at the US National Academy of Sciences in Washington, D. C. from 16 to 20 June 1975. The seminar was followed by a series of visits to US scientific research laboratories and universities, to which the visiting USSR scientists were escorted bv Dr. W. E. Kock and Dr. G. W. Stroke. The visits included Bell Laboratories, IBM Thomas J. Watson Research Laboratory and M. I. T. , as reported in detail in the FOREWORD of Volume I. Volume II now presents the papers presented by another group of US and USSR scientists, some having participated in the first seminar: this series of papers was presented at the Second US-USSR Science Cooperation Seminar on "Optical Information Processing" held at the USSR Academy of Sciences Siberian Branch Institute of Auto­ mation and Electrometry in the famous "science city" of Akademgorodok, near Novosibirsk in Siberia, USSR from 10 to 16 July 1976.