基于自适应频带选择的数字水印技术
A digital watermarking algorithm based on adaptive selection of frequency-band
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摘要: 如何选择水印的隐藏区域是水印算法中的关键问题。该文提出了一种自适应DCT域水印算法,利用了人眼视觉系统(HVS)和图像局部特性自适应地选择水印隐藏区域,有效地实现了水印的稳定性和不可见性的折衷。与其它水印算法比较,该文提出的自适应算法适合于具有不同总体特性和局部特性的图像。实验结果表明该算法具有很好的感知质量,水印稳健性好,可以抵制各种图像处理操作诸如加性白噪声(AWGN),JPEG压缩以及裁剪,中值滤波,缩放等。Abstract: How to select the hidden area for watermarking is an important issue in the design of watermarking algorithm. In this paper an adaptive DCT watermarking algorithm is proposed, in which the hidden area is selected according to human visual system model and local characteristics of image. Thus robustness and imperceptibility could be well balanced. Experimental results demonstrate that this algorithm is effective, and invisible watermark is robust against many kinds of image processing such as additive white Gaussian noise, JPEG compression, cropping, median filtering and resizing.
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