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October 01, 2005

Extended Visual Cryptography Schemes

(Page 3 of 3)
October, 2005: Extended Visual Cryptography Schemes

(a) 

   +-+-+-+     +-+-+-+     +-+-+-+
   |1|1|1|     |1|1|0|     |1|1|1|
   +-+-+-+     +-+-+-+     +-+-+-+
   |1|1|0|  +  |1|1|0|  =  |1|1|0|
   +-+-+-+     +-+-+-+     +-+-+-+
   |0|0|0|     |0|0|0|     |0|0|0|
   +-+-+-+     +-+-+-+     +-+-+-+
    T1=4        T2=5        Tt=4
(b) 
   +-+-+-+     +-+-+-+     +-+-+-+
   |1|1|1|     |0|1|1|     |1|1|1|
   +-+-+-+     +-+-+-+     +-+-+-+
   |1|1|0|  +  |0|1|1|  =  |1|1|1|
   +-+-+-+     +-+-+-+     +-+-+-+
   |0|0|0|     |0|0|0|     |0|0|0|
   +-+-+-+     +-+-+-+     +-+-+-+
    T1=4        T2=5        Tt=3
(c) 
   +-+-+-+     +-+-+-+     +-+-+-+
   |1|1|1|     |0|1|1|     |0|0|1|
   +-+-+-+     +-+-+-+     +-+-+-+
   |1|1|1|  +  |1|1|1| <>  |0|1|1|
   +-+-+-+     +-+-+-+     +-+-+-+
   |1|0|0|     |0|1|1|     |0|0|0|
   +-+-+-+     +-+-+-+     +-+-+-+
    T1=2        T2=2        Tt=6

Figure 2: Three examples of pixel arrangements.

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