Abstract：A novel gray-level digital watermarking is proposed.It uses grayscale image instead of binary image as the watermark.The watermark image is decomposed using two layer wavelet transformation and a simple quantization technique is used to further decompose the coefficients into bit sequences.After original image is decomposed using three layer wavelet transformation,the lattice vector quantization is used to construct the embedding strategy,in which coarse and detail watermark sequences are embedded into coarse and detail coefficients of original image,and the extracting strategy without need original image.To enhance security of the watermark,chaotic sequence is used to modulate the watermark.Experiment results have demonstrated that the proposed algorithm is more robust against J PEG compression and additive white gaussian noise than other similar watermarking algorithm,while the watermarked images have better quality.The recovered watermark image has good quality even under J PEG compression with a quality factor of 30.
李晓强. 基于格的灰度级水印技术[J]. 电子学报, 2006, 34(S1): 2438-2442.
LI Xiao-qiang. Lattice Based Gray-Level Digital Watermarking. Chinese Journal of Electronics, 2006, 34(S1): 2438-2442.
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