Histogram Modification and Wavelet Transform for High Performance Watermarking
Figure 1
The histogram modification strategy: (a) the original histogram and (b) the histogram shifting: shift bins larger than 0 rightward (orange bins). (c) Secret data embedding: embed secret data “0” by keeping the difference of the pixel value not changed (blue bin) and embed secret data “1” by changing the difference of the pixel value from 0 to 1 (red bin). (d) The modified histogram.
