A Novel Multilevel DCT Based Reversible Data Hiding
نویسندگان
چکیده
Discrete Cosine Transform (DCT) and wavelet transform are widely used in image processing such as compression, recognition and information hiding. DCT, a sub-optimal transform, is favorably close to the optimal Karhunen-Loeve Transform (KLT). The popular JPEG image format adopts the DCT as the core transform technique owing to its low computation cost, good decorrelation and energy compaction properties (Rao et al., 1990). In the past decades, another efficient transform, the wavelet transform has been developed to exploit the multi-resolution property in signals. It was then successfully employed in the new image format standard known as JPEG 2000. The applications of DCT and wavelet transform span from signal compression, recognition, feature extraction (Ma et al., 2004; Chen et al., 2006; Jing AbsTRACT
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