实现水印嵌入，提取水印和对图像进行jpeg攻击-The realization of watermark embedding, watermark extraction and image jpeg attack

依据自相关运算和互相关运算的原理，对一信号进行自相关操作-Based on autocorrelation and cross correlation by using the principle of a signal from the correlation operation

【谷速软件】matlab有偿编程 对于灰度和彩色图像的快速归一化互相关 可以作为参考使用-[Valley] matlab paid programming speed software for grayscale and color images quickly normalized cross-correlation can be used as a reference