Cryptographic copyright protection for digital images based on watermarking techniques

✍ Scribed by Joseph Ó Ruanaidh; Holger Petersen; Alexander Herrigel; Shelby Pereira; Thierry Pun

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 413 KB
• Volume: 226
• Category: Article
• ISSN: 0304-3975
• DOI: 10.1016/s0304-3975(99)00069-9

✦ Synopsis

In this paper we present a new approach for the secure and robust copyright protection of digital images. We describe a system for generating digital watermarks and for trading watermarked images. 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 of a oneway watermark embedding and the veriÿcation function to identify and prove the uniqueness of the watermark. Legal dispute resolution is supported for the multiple watermarking of a digital image without revealing the conÿdential keying information.