Device that reads data encoded as dots

Abstract

A system is disclosed for reading data encoded as a series of invisible dots carried on a substrate. The system has a detector that detects the dots on the substrate and outputs a first signal; a decoder interconnected to the detector that decodes the first signal to produce an output signal; and an output device interconnected to the processor that receives the output signal and creates a corresponding human readable output. The dots may be infrared absorbing and the encoding can include Reed-Solomon encoding of the prerecorded audio. The system can include a wand-like arm having a slot through which the photograph is inserted.

1 . A display device comprising:
 a slot for receiving a card having visible content printed thereon, the card further having the dot data encoded on the surface of the card as an array of dots, the array of dots being printed on the surface independently of the visible content printed on the surface;   a detector for optically detecting the array of dots across the surface of the card received in the slot and for outputting a first signal representative thereof;   a decoder interconnected to said detector for receiving and decoding said first signal to produce a display signal corresponding to the first signal; and   a display for displaying the display signal.   
   
   
       2 . The device of  claim 1  wherein the dots are dots of ink. 
   
   
       3 . The device according to  claim 2  wherein the ink is substantially invisible to an average unaided human eye. 
   
   
       4 . The device of  claim 3  wherein the ink is infrared absorbing ink with little absorption in the visible spectrum. 
   
   
       5 . The device of  claim 1  wherein said dot data is encoded using Reed-Solomon encoding.