Watermark recovery with a DCT based scheme employing nonuniform imbedding

Author

Retsas, Ioannis ; Pieper, Ron ; Cristi, Roberto

Author_Institution

Dept. of Electr. & Comput. Eng., Naval Postgraduate Sch., Monterey, CA, USA

fYear

2002

fDate

2002

Firstpage

157

Lastpage

161

Abstract

Digital Watermarking is a highly evolving field, which involves the embedding of a digital signature under a multimedia object (image, video, audio) for the purpose of copyright protection In our paper we propose a method of embedding watermarks in still digital images in the DCT domain. A unique approach of rating the 8×8 blocks of the image DCT coefficients is proposed. The experimental results show sufficient robustness of the proposed scheme to common attacks such as cropping, and JPEG lossy compression.

Keywords

block codes; copy protection; discrete cosine transforms; image coding; quantisation (signal); DCT based scheme; DCT domain; JPEG lossy compression robustness; copyright protection; cropping robustness; digital signature; digital watermarking; image DCT coefficients; multimedia object; multimedia security; nonuniform imbedding; still digital images; watermark recovery; Copyright protection; Digital images; Digital signatures; Discrete cosine transforms; Frequency; Image coding; Robustness; Transform coding; Video compression; Watermarking;

fLanguage

English

Publisher

ieee

Conference_Titel

System Theory, 2002. Proceedings of the Thirty-Fourth Southeastern Symposium on

ISSN

0094-2898

Print_ISBN

0-7803-7339-1

Type

conf

DOI

10.1109/SSST.2002.1027025

Filename

1027025