A Lossless Data-hiding Technique based on Wavelet Transform

A lossless data-hiding scheme in this scheme is proposed based on quantized coefficients of discrete wavelet transform (DWT) in the frequency domain. Using the quantized 9/7 wavelet filter, we embed secret data into the successive zero coefficients of the medium-high frequency components in each reconstructed block for 3-level 2D DWT of a coverimage. The procedures of this approach include embedding, extraction, and restoration. Experiment results show that this proposed method can achieve high embedding capacity and acceptable image quality of stego-image, and data reversibility.