A robust and blind image watermarking scheme in DCT domain

Arup Kumar Pal, Soumitra Roy
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引用次数: 9

Abstract

In this paper, the authors have presented a robust and blind watermarking scheme based on discrete cosine transform (DCT) for protecting the copyright ownership of digital images. Initially, the image is decomposed into non-overlapping blocks and subsequently DCT is employed on each block to embed a binary bit of watermark into each transformed block by modifying some middle significant AC coefficients using repetition code. During the embedding phase of the proposed method, DC and some higher AC coefficients are kept intact after zigzag scanning of each DCT block to ensure the high visual quality of watermarked image. This scheme is suitable to protect the copyright information even in compressed form of the watermarked image since it exploits middle bands of DCT coefficients for embedding the watermark bits. The proposed scheme is also tested to verify the withstand capability against several image processing attacks and satisfactory results are achieved.
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一种基于DCT域的鲁棒盲图像水印方案
本文提出了一种基于离散余弦变换(DCT)的鲁棒盲水印方案,用于数字图像版权保护。首先将图像分解为互不重叠的块,然后在每个块上使用DCT,通过重复编码修改一些中间有效的AC系数,在每个变换后的块中嵌入一个二进制的水印位。在该方法的嵌入阶段,对每个DCT块进行之字形扫描后,DC和一些较高的AC系数保持不变,以保证水印图像的高视觉质量。该方案利用离散余弦变换系数的中间带嵌入水印位,适用于水印图像压缩后的版权信息保护。本文还对该方案进行了测试,验证了该方案对多种图像处理攻击的抵御能力,取得了令人满意的结果。
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