Wavelet Coefficient Quantization for Blind Image Watermarking

Wavelet Coefficient Quantization for Blind Image Watermarking

This paper proposed a robust digital image watermarking scheme based on remainder of wavelet blocks. At first, the original image is decomposed into ten sub-bands bythe 3-level wavelet transform. Then, the values of wavelet coefficients are quantized. By increasing divisor and size of blocks, itis possible to embed watermark bits in the host image with more energy; however, this will lead to PSNR reduction. The experimental results show that the proposed algorithm has agood resistance against to common attacks, especially JPEG compression; moreover it outperforms previous methods in the most situations