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首页> 外文会议>Broadband Multimedia Systems and Broadcasting, 2009. BMSB '09 >A region-specific QIM-based watermarking scheme for digital images
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A region-specific QIM-based watermarking scheme for digital images

机译：基于区域的基于QIM的数字图像水印方案

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摘要

Angle Quantization Index Modulation (AQIM) is a watermarking technique that achieves provably good capacity-distortion-robustness performance. The scheme embeds each bit of a watermark message on an image by quantizing the angle formed by a vector of pixels or frequency coefficients from the host image with the origin of a hyperspherical coordinate system. While it has been demonstrated that AQIM is insensitive to intensity scaling attacks, the quantization step employed throughout the embedding process is set to a constant value regardless of the nature of the image. Because of this, the perceptual quality of the watermarked image cannot be regulated. In this paper, we propose a straightforward yet powerful AQIM-based watermarking scheme that considers the statistical behavior of the region where a message bit is to be embedded before settling on the size of the quantization step. Experimental results show that, for the same watermark capacity and image fidelity parameters, our proposed region-specific scheme exhibits a lower bit error rate than the regular AQIM approach.
机译：角度量化指标调制（AQIM）是一种水印技术，可实现可证明的良好的容量失真鲁棒性。该方案通过量化由宿主图像的像素矢量或频率系数与超球面坐标系的原点形成的角度，将水印消息的每一位嵌入到图像上。尽管已证明AQIM对强度缩放攻击不敏感，但无论图像的性质如何，整个嵌入过程中采用的量化步长均设置为恒定值。因此，无法调节水印图像的感知质量。在本文中，我们提出了一种简单但功能强大的基于AQIM的水印方案，该方案考虑了在确定量化步长之前要嵌入消息位的区域的统计行为。实验结果表明，对于相同的水印容量和图像保真度参数，我们提出的针对特定区域的方案显示出比常规AQIM方法更低的误码率。

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