| 摘要 |
An identification card or credit card contains a unique holographically encoded number which may be decoded by a simple decoder requiring only a single flashlight bulb as a light source for reconstructing an image of the holographic code. This reconstructed image comprises a fixed predetermined pattern of a total number of spaced points, some of which, in accordance with the coded number, are manifested by light spots while the rest of the points are manifested by dark spots.
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