Joint near-lossless compression and watermarking of still images for authentication and tamper localization

Authors:
Roberto Caldelli;Francesco Filippini;Mauro Barni
Affiliations:
Department of Electronics and Telecommunications, University of Florence, Via di Santa Marta, 3, 50139 Florence, Italy;Department of Electronics and Telecommunications, University of Florence, Via di Santa Marta, 3, 50139 Florence, Italy;Department of Information Engineering, University of Siena, Siena, Italy
Venue:
Image Communication
Year:
2006

Citing 3
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Abstract

A system is presented to jointly achieve image watermarking and compression. The watermark is a fragile one being intended for authentication purposes. The watermarked and compressed images are fully compliant with the JPEG-LS standard, the only price to pay being a slight reduction of compression efficiency and an additional distortion that can be anyway tuned to grant a maximum preset error. Watermark detection is possible both in the compressed and in the pixel domain, thus increasing the flexibility and usability of the system. The system is expressly designed to be used in remote sensing and telemedicine applications, hence we designed it in such a way that the maximum compression and watermarking error can be strictly controlled (near-lossless compression and watermarking). Experimental results show the ability of the system to detect tampering and to limit the peak error between the original and the processed images.