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    • 2. 发明授权
    • Method of designing watermark in consideration of wiener attack and whitening filtered detection
    • 考虑到智能攻击和美白滤波检测设计水印的方法
    • US07076081B2
    • 2006-07-11
    • US10271530
    • 2002-10-17
    • Youngha HwangKiryung LeeKyung Ae MoonMyung Joon Kim
    • Youngha HwangKiryung LeeKyung Ae MoonMyung Joon Kim
    • G06K9/00
    • G06T1/005G06T2201/0052G06T2201/0065H04N1/32149H04N1/3232
    • Disclosed a method of designing a watermark having the power spectral density optimized so that the detection performance can be improved by employing the whitening filtered detection after the Wiener attack. The power spectral density of the watermark is designed using an optimization method that can improve the entire detection performance by reflecting the gain of the whitening filter after the Wiener attack. A higher detection gain is obtained using the whitening filter after the Wiener attack, and the expected value of the difference between test statistics of the two hypotheses that the watermark exists and the watermark does not exist, respectively, is maximized to optimize the detection performance. Regarding the expected value of the difference between the test statistics as an objective function, the power spectral density of the watermark, which corresponds to a maximum differentiated value of the power spectral density of the watermark using the Lagrange multiplier method, is obtained.
    • 公开了一种设计具有优化的功率谱密度的水印的方法,以便可以在Wiener攻击之后采用白化滤波检测来提高检测性能。 使用优化方法设计水印的功率谱密度,通过在Wiener攻击后反映白化滤波器的增益,可以提高整个检测性能。 在Wiener攻击之后使用白化滤波器获得更高的检测增益,并且最大化分别对水印存在的两个假设的测试统计和不存在水印的测试统计之间的差异的期望值进行优化。 关于作为目标函数的测试统计之间的差异的期望值,获得与使用拉格朗日乘数法的水印的功率谱密度的最大微分值相对应的水印的功率谱密度。
    • 10. 发明申请
    • Amplitude-scaling resilient audio watermarking method and apparatus based on quantization
    • 基于量化的幅度缩放弹性音频水印方法和装置
    • US20050043830A1
    • 2005-02-24
    • US10700488
    • 2003-11-05
    • Kiryung LeeDong Sik KimKyung Ae MoonYoung Ho Suh
    • Kiryung LeeDong Sik KimKyung Ae MoonYoung Ho Suh
    • G10L21/00G10L19/00G10L19/02G06F17/00H04L9/00
    • G10L19/018G10L19/032
    • Disclosed is an amplitude-scaling resilient audio watermarking apparatus and method. An encoding apparatus includes: a polyphase filterbank for dividing an audio signal into a plurality of subbands; a psychoacoustic module for applying a psychoacoustic model to the audio signal to provide a signal-to-mask ratio; a watermark encoder for evaluating an encoding parameter from the subbands according to the signal-to-mask ratio and embedding the encoding parameter and a watermark into subbands corresponding to the middle frequency; and a synthesis filterbank for synthesizing the subband signals to output a watermarked audio signal. A decoding apparatus includes: a polyphase filterbank for dividing a received audio signal into the predetermined number of subbands; an EM estimator for estimating an scale factor from an encoding parameter contained in the audio signal and a watermarked subband according to an EM algorithm, and generating the quantizer step size Δd of a decoder according to the amplitude-scaling; a watermark decoder for extracting a watermark from a subband corresponding to the middle frequency considering the quantizer step size; and an integrated determiner for integrating outputs of the watermark decoder to determine a watermark.
    • 公开了一种幅度缩放弹性音频水印设备和方法。 编码装置包括:多相滤波器组,用于将音频信号分成多个子带; 用于将心理声学模型应用于音频信号以提供信号与掩模比的心理声学模块; 水印编码器,用于根据信号对掩模比率从子带估计编码参数,并将编码参数和水印嵌入到与中频对应的子带中; 以及用于合成子带信号以输出加水印音频信号的合成滤波器组。 解码装置包括:多相滤波器组,用于将接收到的音频信号分成预定数量的子带; EM估计器,用于根据EM算法从包含在音频信号中的编码参数和加水印子带中估计比例因子,以及根据幅度缩放产生解码器的量化器步长Deltad; 水印解码器,用于考虑到量化器步长从与中频相对应的子带中提取水印; 以及用于积分水印解码器的输出以确定水印的集成确定器。