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++实现DCT和IDCT,是可以实现的。-DCT AND IDCT WRITTEN BY VC++

The whole figure watermark, using vc + + programming, using DCT domain, is a robust watermark,-The whole figure watermark, using vc++ programming, using DCT domain, is a robust watermark,