Lossless information hiding method based on data difference value
An information hiding and difference technology, applied in the field of communications, can solve the problems of low hidden capacity, hidden capacity and implementation complexity that cannot meet user needs, and complex hardware implementation.
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[0057] A lossless information hiding method based on data difference, the steps are as follows:
[0058] 1) Let the data stream A=X1, X2, X3, X4, X5, X6...Xn, group the data stream A in order from front to back, each group has 2 numbers, and subtract the following number Xk from each group of data For the previous number X(k-1), the difference Ek=Xk-X(k-1) of the group of data is obtained, k is a positive integer greater than or equal to 2, and n is an even number;
[0059] 2) Set threshold T=2 t -1; if the absolute value of the difference Ek of a certain packet data is less than or equal to the threshold T, then express Ek directly with t bits, if the absolute value of the difference Ek of a certain packet data is greater than the threshold T, then this case Represented by the remaining state of t bits "t 1";
[0060] The value of T includes 1, 3, 7, 15, 31, 63, 127;
[0061] T=0,t=0
[0062] T=1,t=1
[0063] T=3,t=2
[0064] T=7,t=3
[0065] T=15,t=4
[0066] T=31,t=...
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