Secure Copyright Protection Techniques for Digital Images

This paper2 presents a new approach for the secure and robust copyright protection of digital images. A system for generating digital watermarks and for trading watermarked images is described. The system is based on a new watermarking technique, which is robust against image transformation techniques such as compression, rotation, translation, scaling and cropping. It uses modulation of the magnitude components in Fourier space to embed a watermark and an accompanying template and, during watermark extraction, reads a template in the log polar transform of the frequency domain. The template is used for analyzing scaling and rotation su ered by the watermarked stego-image. The detection of the watermarks is also possible without any need for the original cover-image. In addition, the system applies asymmetric cryptographic protocols for di erent purposes, namely embedding detecting the watermark and transferring watermarked data. The public key technique is applied for the construction...

• Type: Conference
• Year: 1998
• Where: IH
• Authors: Alexander Herrigel, Joseph Ó Ruanaidh, Holger Petersen, Shelby Pereira, Thierry Pun
• Keywords: IH 1998, Information Management, Trading Watermarked Images, Watermark, Watermarked