Image authentication by means of fragile CGH watermarking

Giuseppe Schirripa Spagnolo; Carla Simonetti; Lorenzo Cozzella

doi:10.1117/12.623134

23 September 2005 Image authentication by means of fragile CGH watermarking

Giuseppe Schirripa Spagnolo, Carla Simonetti, Lorenzo Cozzella

Proceedings Volume 5954, Optical Security Systems; 59540W (2005) https://doi.org/10.1117/12.623134
Event: Congress on Optics and Optoelectronics, 2005, Warsaw, Poland

Abstract

In this paper we propose a fragile marking system based on Computer Generated Hologram coding techniques, which is able to detect malicious tampering while tolerating some incidental distortions. A fragile watermark is a mark that is readily altered or destroyed when the host image is modified through a linear or nonlinear transformation. A fragile watermark monitors the integrity of the content of the image but not its numerical representation. Therefore the watermark is designed so that the integrity is proven if the content of the image has not been tampered. Since digital images can be altered or manipulated with ease, the ability to detect changes to digital images is very important for many applications such as news reporting, medical archiving, or legal usages. The proposed technique could be applied to Color Images as well as to Gray Scale ones. Using Computer Generated Hologram watermarking, the embedded mark could be easily recovered by means of a Fourier Transform. Due to this fact host image can be tampered and watermarked with the same holographic pattern. To avoid this possibility we have introduced an encryption method using a asymmetric Cryptography. The proposed schema is based on the knowledge of original mark from the Authentication

Citation Download Citation

Giuseppe Schirripa Spagnolo, Carla Simonetti, and Lorenzo Cozzella "Image authentication by means of fragile CGH watermarking", Proc. SPIE 5954, Optical Security Systems, 59540W (23 September 2005); https://doi.org/10.1117/12.623134

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KEYWORDS

Digital watermarking

Computer generated holography

Digital imaging

Image compression

Medical imaging

Image filtering

3D image reconstruction

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