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    • 4. 发明授权
    • Watermarking recursive hashes into frequency domain regions
    • 将水印递归到频域区域
    • US06683966B1
    • 2004-01-27
    • US09689293
    • 2000-10-11
    • Jun TianStephen K. DeckerHugh L. Brunk
    • Jun TianStephen K. DeckerHugh L. Brunk
    • G06K900
    • G06T1/0028G06T2201/0052H04N1/3216H04N1/3217H04N1/32187H04N1/32283H04N1/32352H04N2201/3233H04N2201/3236H04N2201/327
    • A watermark embedder transforms a media signal from its perceptual domain to frequency domain regions and embeds a hash of data from one frequency domain region into a watermark in another frequency domain region. Alternatively, it encodes instances of the same message into the frequency domain regions. To detect alteration of the media signal, a watermark decoder transforms a suspect signal into the frequency domain regions, extracts the watermark message from a first frequency domain region and compares it with a reference derived from another frequency domain region. The reference signal is either a hash computed from the other frequency domain region of the watermarked signal, or another instance of the same message embedded into the other frequency domain region. The decoder can be used to detect alteration of the signal, such as alteration that occurs with reproduction (printing, scanning, copying, D/A-A/D conversion, etc.), compression, cropping or swapping of media signal content, etc.
    • 水印嵌入器将媒体信号从感知域转换到频域区域,并将来自一个频域区域的数据的散列嵌入另一个频域区域中的水印。 或者,它将相同消息的实例编码到频域区域中。 为了检测媒体信号的变化,水印解码器将可疑信号转换成频域区域,从第一频域区域提取水印消息,并将其与从另一个频域区域导出的参考进行比较。 参考信号是从水印信号的另一频域区域计算的散列或嵌入到另一频域区域中的相同消息的另一实例。 解码器可用于检测信号的变化,例如再现(打印,扫描,复制,D / A-A / D转换等),媒体信号内容的压缩,裁剪或交换等发生的变化。