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1.发明授权公开(公告)号：US06985590B2
公开(公告)日：2006-01-10
申请号：US09741715
申请日：2000-12-20
CPC分类号： G10L19/018 , G10L19/02
摘要： The present invention provides a method and a system with which information embedded in compressed digital audio data can be directly operated. An embodiment of the system for embedding additional information in compressed audio data includes: means for extracting MDCT (Modified Discrete Cosine Transform) coefficients from the compressed audio data; means for employing the MDCT coefficients to calculate a frequency component for the compressed audio data; means for embedding additional information in the frequency component obtained in a frequency domain; means for transforming into MDCT coefficients the frequency component in which the additional information is embedded; and means for using the MDCT coefficients, in which the additional information is embedded, to generate compressed audio data.
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公开(公告)号：US06915001B2
公开(公告)日：2005-07-05
申请号：US09894043
申请日：2001-06-28
CPC分类号： G06T1/0085 , G06T1/0028 , G06T2201/0052
摘要： The present invention provides a watermarking method, apparatus and system for embedding additive information in digital data, in which one frame is defined as including samples extracted from digital data and a current frame is defined as a frame that is overlapped by samples of a preceding frame. Included are: a transformation unit, for multiplying a frame extracted from digital data by a window function and performing a Fourier transform on the digital data; an embedding unit, for employing bit information and a frequency band to change the amplitude of the frequency component in the digital data; a transformation unit, for performing an inverse Fourier transform to return the frequency component whose amplitude has been changed by the frequency domain embedding unit; and a frame generator, for multiplying the time domain signal and superimposing overlapped frames to generate a frame wherein the additive information is embedded.
摘要翻译： 本发明提供了一种用于在数字数据中嵌入附加信息的水印方法，装置和系统，其中一帧被定义为包括从数字数据提取的样本，并且当前帧被定义为与先前帧的样本重叠的帧 。 包括：变换单元，用于将从数字数据提取的帧乘以窗口函数并对数字数据执行傅立叶变换; 嵌入单元，用于采用比特信息和频带来改变数字数据中的频率分量的幅度; 变换单元，用于执行逆傅里叶变换以返回由频域嵌入单元改变幅度的频率分量; 以及帧生成器，用于将时域信号相乘并叠加重叠帧以生成其中嵌入了添加信息的帧。
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公开(公告)号：US07006655B2
公开(公告)日：2006-02-28
申请号：US09952589
申请日：2001-09-11
IPC分类号： H04K1/00
CPC分类号： G06T1/0064 , G06T2201/0061 , H04N1/32352
摘要： The present invention provides methods, apparatus and systems for embedding and detecting an electronic watermark without requiring signals for geometric compensation. A particular embodiment uses a periodic pattern with repetition as an embedded pattern itself, which has information embedded as an electronic watermark, and observes the change of its period upon detection to calculate the scaling factor. When detecting the electronic watermark, the scaling factor of images is calculated from digital data that underwent the scaling processing, and then the processing to detect the electronic watermark is performed based on the obtained scaling factor.
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