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1. 发明申请

US20080152128A1 STEGOTEXT ENCODER AND DECODER 有权
标题翻译： STEGOTEXT编码器和解码器
公开(公告)号：US20080152128A1
公开(公告)日：2008-06-26
申请号：US11869507
申请日：2007-10-09
申请人： Roger Fane Sewell , Mark St.John Owen , Stephen John Barlow , Simon Paul Long
发明人： Roger Fane Sewell , Mark St.John Owen , Stephen John Barlow , Simon Paul Long
IPC分类号： H04L9/28 , H04L17/14 , G06F17/16 , G06F17/10
CPC分类号： H04H20/31 , G06T1/0028 , G06T1/005 , G06T2200/28 , G06T2201/0052 , G06T2201/0065 , G10L19/018
摘要： The invention comprises an encoder for encoding a stegotext and a decoder for decoding the encoded stegotext, the stegotext being generated by modulating the log power spectrogram of a covertext signal with at least one key, the or each key having been added or subtracted in the log domain to the covertext power spectrogram in accordance with the data of the watermark code with which the stegotext was generated, and the modulated power spectrogram having been returned into the original domain of the covertext. The decoder carries out Fast Fourier Transformation and rectangular polar conversion of the stegotext signal so as to transform the stegotext signal into the log power spectrogram domain; subtracts in the log power domain positive and negative multiples of the key or keys from blocks of the log power spectrogram and evaluates the probability of the results of such subtractions representing an unmodified block of covertext in accordance with a predetermined statistical model.
摘要翻译：本发明包括一个编码器，用于对一个熟悉的编码器和一个解码器进行编码，该编码器通过用至少一个键调制覆盖文本信号的对数功率谱图来生成，该信号是通过在日志中被加或减根据生成了嘟嘟声的水印码的数据，将调制后的功率谱图返回到覆盖文本的原始域。解码器执行快速傅里叶变换和stegotext信号的矩形极化转换，以将stegotext信号转换成对数功率谱图域; 从对数功率谱图的块中减去对数功率域的键或键的正负的倍数，并根据预定的统计模型来评估表示未修改的覆盖文本块的这种减法的结果的概率。

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