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Digital watermarking is the process of introducing small modifications into a copy of a digital document that can be detected later. The embedded information can be used to determine the document's owner or simply to distinguish several copies. However, coincidental or malicious ''attacks'' can degrade the robustness of watermark detection. Here, uniform scalar quantization of watermarked documents...
We introduce quasi-subtractive dithering (QSD) as a practical way to approximate subtractive dithering (SD). Dithering is used in quantization to reduce correlation between the quantization error and the signal being quantized, usually at the cost of reduced signal-to-noise ratio (SNR). Theoretically, SD can achieve decorrelation without degrading SNR. Unfortunately, it requires the exact subtraction...
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