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An Improved Wavelet based Image Compression Scheme and Oblivious Watermarking


K.Veeraswamy, S.SrinivasKumar


Vol. 8  No. 4  pp. 170-177


This paper presents a novel procedure to improve the performance of a Wavelet based image compression in terms of entropy. All the subbands of wavelet decomposed image are quantized based on the energy of the subband. The quantized and rounded coefficients in the LL subband are re-ordered in a pre-determined manner. A prediction algorithm is used to reduce the entropy (bits/pixel). In addition, an oblivious image watermarking algorithm is proposed using compressed LL subband. The performance of the proposed watermarking algorithm is measured in terms of Peak Signal to Noise Ratio (PSNR) and Normalized Cross Correlation (NCC). Further, this algorithm is robust for various attacks including JPEG and JPEG2000 compression on watermarked image.


Image compression, Topological re-ordering, Wavelet transform, Image watermarking