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This technique, called quatrix (for quasi-matrix), has potential application in numerous communication and datahandling areas, since it provides high-density matrix-photocell capability at much lower cost. The method uses a few photographically-produced precision coding masks fitted over an equal number ( ) of photocells. Thus, ten ( ) typical high-detectivity photocells and ten coding masks will produce 210(2N) binary combinations, behaving like a 32 by 32 matrix photodetector and using only 10 preamps. Twenty larger cells and preamps promise a million element matrix. Limitations are discussed.