Dong Hyun Kim , Kye Suk Jun , Dae Young Lee

The KIPS Transactions:PartB , Vol. 12, No. 7, pp. 729-736, Dec. 2005
10.3745/KIPSTB.2005.12.7.729,   PDF Download:

Abstract

In this paper, the proposed method for the digital watermarking is based on the multiresolution wavelet transform. The l-level Discrete Wavelet Transform(DWT) coefficients of a 2Nwx x 2Nwy binary logo image used as a watermarks. The LL band and middle frequency band of the host image that the 3-level DWT has been performed are divided into Nwx x Nwy size and we use large coefficients at the divided blocks to make threshold. we set the thresholds that completely insert the watermark in each frequency of the host image. The thresholds in each frequency of the host image differ each other. The watermarks where is the same positions are added to the larger coefficients than threshold in the blocks at LL band and middle frequency band in order to prevent the quality deterioration of the host image. The watermarks are inserted in LL band and middle frequency band of the host image. In order to be invisibility of the watermark, the Human Visual System(HVS) is applied to the watermark. We prove the proper embedding method by experiment. We rapidly detect the watermark using this watermarking method. And because the small size watermarks are inserted by HVS, the results confirm the superiority of the proposed method on invisibility and robustness.

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