A reversible data hiding scheme based on integer-tointeger
wavelet transform is proposed in this paper. The
scheme uses a Sudoku-based method to embed data by
modifying the wavelet coefficients. First, the algorithm
performs the one-level integer wavelet transform of the
host image and obtains four sub-bands, i.e., LL1, HL1,
LH1, and HH1. Then, the HL1 sub-band is used as the
base matrix, and the LH1 sub-band is used as the variable
matrix to embed the secret digits according to a Sudoku
table. A location map is created to record the embeddable
coefficients, and the map is embedded into the sub-band
of HH1. The experimental results showed that our proposed
scheme produced a higher-q
