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    • 17. 发明授权
    • Method and apparatus for detecting processing stages applied to a signal
    • 用于检测应用于信号的处理阶段的方法和装置
    • US07046808B1
    • 2006-05-16
    • US09535154
    • 2000-03-24
    • Eric MetoisRade PetrovicKanaan Jemili
    • Eric MetoisRade PetrovicKanaan Jemili
    • H04K1/02H04L9/00
    • G06T1/0042G06T1/0028G06T2201/0202H04N1/32144H04N1/32154H04N1/32187H04N1/32299H04N1/32304H04N1/3232H04N1/32331H04N1/32352
    • A system for determining the amount of processing that has been applied to watermarked signal. A steganographic signal is provided that includes an original signal and an embedded fragile watermark. The fragile watermark is characterized by a low energy and a high redundancy in comparison to a robust watermark. The steganographic signal is communicated over a distribution channel to a decoder. At the decoder, a measure of a presence of the fragile watermark in the acquired steganographic signal is provided, along with an estimate of the fragility profile of the fragile watermark for this particular original signal. Based on these factors, a estimate is made of the amount of processing that the steganographic signal has undergone. This processing can include, for example, A/D and D/A conversions, resampling, band-limiting, perceptual compression/decompression, etc. Optionally, the fragility profile is derived prior to the distribution of the content and communicated by the steganographic signal for recovery by the decoder. Furthermore, a robust watermark may be provided in the steganographic signal that, e.g., designates the presence of the fragile watermark to a decoder.
    • 一种用于确定已应用于水印信号的处理量的系统。 提供了包含原始信号和嵌入的脆弱水印的隐写信号。 与鲁棒水印相比,脆弱水印的特征在于低能量和高冗余度。 隐写信号通过分发信道传送到解码器。 在解码器中,提供了在所获取的隐写信号中存在脆弱水印的度量以及用于该特定原始信号的脆弱水印的脆弱性分布的估计。 基于这些因素,估计隐身信号已经经历的处理量。 该处理可以包括例如A / D和D / A转换,重采样,频带限制,感知压缩/解压缩等。可选地,脆弱性分布是在内容分发之前导出的并通过隐写信号传送的 用于由解码器恢复。 此外,可以在隐写信号中提供鲁棒水印,例如,将脆弱水印的存在指定给解码器。