| 摘要 |
Information in binary form is stored in a planar array or mosaic of light-polarizing cells, wherein each cell may have two distinct orientations of the axis of polarization. For example, binary "1" may be denoted by setting the axis of polarization in any cell to the vertical, and binary "0" by setting the axis to horizontal. Binary data so stored are invisible to the naked eye, but will become visible as a pattern of light and dark spots when viewed through a second polarizer. A unique property of light-polarizing mosaics is that when two such mosaics are laid one atop the other in precise registration, the resulting visible pattern of light and dark spots portrays the modulo-two sum (also known as the "exclusive or" product) of the two sets of binary information stored therein. If the binary data stored in one such mosaic were data created by modulo-two addition of a set of intelligible data with a set of random data, and if this same set of random data were stored in a second such mosaic, the original data will become immediately visible in its intelligible form merely by overlaying the two mosaics.
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