可抵抗JPEG压缩的可逆水印技术。

Reversible Watermarking Surviving JPEG Compression.

作者信息

Zain J, Clarke M

机构信息

School of Information Systems, Computing and Mathematics, Brunel University, Kingston Lane, Uxbridge UB8 3PH, United Kingdom.

出版信息

Conf Proc IEEE Eng Med Biol Soc. 2005;2005:3759-62. doi: 10.1109/IEMBS.2005.1617302.

DOI:10.1109/IEMBS.2005.1617302

PMID:17281047

Abstract

This paper will discuss the properties of watermarking medical images. We will also discuss the possibility of such images being compressed by JPEG and give an overview of JPEG compression. We will then propose a watermarking scheme that is reversible and robust to JPEG compression. The purpose is to verify the integrity and authenticity of medical images. We used 800x600x8 bits ultrasound (US) images in our experiment. SHA-256 of the image is then embedded in the Least significant bits (LSB) of an 8x8 block in the Region of Non Interest (RONI). The image is then compressed using JPEG and decompressed using Photoshop 6.0. If the image has not been altered, the watermark extracted will match the hash (SHA256) of the original image. The result shown that the embedded watermark is robust to JPEG compression up to image quality 60 (~91% compressed).

摘要

本文将讨论医学图像水印的特性。我们还将探讨此类图像被JPEG压缩的可能性，并概述JPEG压缩。然后，我们将提出一种对JPEG压缩具有可逆性和鲁棒性的水印方案。目的是验证医学图像的完整性和真实性。我们在实验中使用了800x600x8位的超声（US）图像。然后将图像的SHA-256嵌入到非感兴趣区域（RONI）中8x8块的最低有效位（LSB）。然后使用JPEG对图像进行压缩，并使用Photoshop 6.0进行解压缩。如果图像未被更改，则提取的水印将与原始图像的哈希（SHA256）匹配。结果表明，嵌入的水印对高达图像质量60（约91%压缩）的JPEG压缩具有鲁棒性。