A NOVEL LOSSY-TO-LOSSLESS WATERMARKING SCHEME FOR JPEG2000 IMAGES (MP-S2)

Author(s) : Zhishou Zhang (Institute for Infocomm Research, Singapore) Qibin Sun (Institute for Infocomm Research, Singapore) Wai-Choong Wong (Institute for Infocomm Research, Singapore)

Abstract : In this paper, we propose a lossy-to-lossless watermarking scheme for JPEG2000/J2K images. The watermarking is incorporated into the procedure of J2K coding in a way that the final watermarked coded J2K bitstream could still keep the lossless-to-lossy scalability: To recover original image, the J2K decoder doesn’t need to extract the embedded watermark. This is achieved by dividing the magnitude bits of the wavelet coefficients into two portions, controlled by watermarking survival rate (WSR). The upper portion is used to embed watermarks, while the lower portion is modified to compensate for the distortion introduced by the watermarks in upper portion. Watermark detection could be done either from the upper portion or from the lower portion, based on a presetting threshold. Experimental results show that the J2K coded water-marked images still nearly follow the rate-distortion curve optimized for their original J2K images.

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