中文说明：
本课题为基于MATLAB的小波变换dwt和离散余弦dct的多方法对比数字水印系统。带GUI交互界面。有一个主界面GUI，可以调用dwt方法的子界面和dct方法的子界面。流程包括，读取宿主图像和水印图像，嵌入，多种方法的攻击（剪切，加噪，旋转等），提取，最后利用psnr峰值信噪比进行评价不同攻击下，鲁棒性的好坏。
English Description：
This topic is a multi method comparison digital watermarking system based on wavelet transform DWT and discrete cosine DCT of MATLAB. With GUI interface. There is a main interface GUI, which can call the sub interface of DWT method and DCT method. The process includes reading the host image and watermark image, embedding, multiple attacks (cutting, adding noise, rotating, etc.), extraction, and finally using PSNR peak signal-to-noise ratio to evaluate the robustness under different attacks.