visible watermarking of two images using DTC is given in this file.PSNR of watermarked image is also calulated along with coreletion factor-visible watermarking of two images using DTC is given in this file.PSNR of watermarked image is also calulated

对信号进行DWT分解，并对信号进行水印提取重构，测试信噪比-decompose signal by DWT,watermark the watermarking test it s PSNR

This paper proposes new watermarking technique based on tetrolet domain. The tetrolet transform is a new adaptive Haar-type wavelet transform based on tetrominoes. It avoids Gibbs oscillation because it applies the Haar function at the edge o