Walsh modulating watermarking algorithm for image print-and-scan process;

This paper focuses on the robust watermarks against print-and-scan, classifies and discusses the techniques based on different domains in which data is embedded.

First, the effect of printing and scanning for images is discussed.

But most pictures come from printing and scanning such as the trademark, packing,books and periodicals,certificate,credential,stamp,magnetism card,the publication,the title page of video and music product,currency,bankbook,valued ticket, admission ticket,documentary evidencem,advertisement,calendar,name card,passport.