Abstract: A verification system utilizing a holographic memory defined by a multiplicity of individual holograms on a photographic strip arranged side by side in elongate, parallel, hologram channels of substantially equal length. A holographic index on the strip identifies the information stored in each channel. The memory is a holographic record of binary spot patterns of multi-digit numbers which are sequentially recorded. The spot pattern for any given number may extend over one or more holograms to fully utilize the available recording space. Data compression is employed to reduce or eliminate the recordation of digits which are identical to corresponding digits of a preceding number to thereby reduce the memory bulk. A given number to be verified is entered in a keyboard and stored, the index is searched and the appropriate memory channel is then searched for a match of the given number with a number in the memory by producing and detecting images from the recorded holograms.

Abstract: Data is recorded in holographic form on elongate film strips in a plurality of parallel, longitudinally extending hologram rows. The film is longitudinally moved past a light beam to reconstruct holographic patterns which are then sensed. The light beam is perpendicular to the film and movable transversely to the film so that any holograph row can be illuminated. The recorded holograms in a row can be searched for comparison with a reference number or symbol for credit card verification and the like in which a small subgroup of members, such as those who forfeited their credit, are to be identified. The reference numbers of the members of the subgroup are recorded on the film and a given member, that is the reference number of a given customer, is compared with the recorded holograms. The reference number of each member of the group is assigned to a particular row so that his number will appear in one and only one row of holograms on the film.