通过DCT变化在图像中，嵌入水印，加入噪声，并解出嵌入图像，计算误差率。-Through the DCT changes in the watermarked image, add noise, and extract out the embedded images to calculate margin of error.

VC++编写的C语言程序，采用小波变换以三种模式给图片添加图片水印。-VC++ program written in C language using wavelet transform in three modes for image Add image watermark.