In this paper, the steganographic method proposed by Chang and Tseng (C.C. Chang et al., 2004) is reviewed and the problem of Chang-Tseng scheme during extraction process is described. Two rectified schemes are proposed to overcome the problem so that the embedded secret data can be recovered correctly from the stego-image
['Suk-Ling Li', 'K.W. Leung', 'L.M. Cheng', 'Chi-Kwong Chan']
Performance Evaluation of a Steganographic Method for Digital Images Using Side Match