Study on Method of New Digital Watermark Generation Using QR-Code

In existing digital watermarking methods, images which have specific pattern images or sign images were used as digital watermarks. Additionally, binary data which were calculated with meaningless Pseudo noise sequences or chaotic functions were used as digital watermarks. However, this method has a limitation in watermark size to be inserted according to the size of original image. This paper suggested a method to generate QR-code which could take much information and use them as digital watermarks. QR-code not only can take much information in QR-code itself but also can include various information like web page when they are connected with links. Additionally, QR-code has a capability to soundly recover the saved data by correcting the errors even if the parts of the images are damaged. This paper used these strengths of QR-code. Suggested method in this paper can overcome the restricted storage limits because existing PN-sequences and Chaos sequences can be used instead and more information can be hidden in the original images, compared with existing method.