双重电子水印的自恢复技术，在第一重水印和第2重水印间建立联系。-Self-Restoring Dual Watermarking Technique. Map relation between primary and secondary watermark

Watermark using DCT is given in these file also dual watermarking is included in this file

implementation this paper in matlab Dual watermark for image tamper detection and recovery http://www.sciencedirect.com/science/article/pii/S003132030800174X