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US08238600B2 Electronic watermark embedding apparatus for selectively embedding electronic watermark information in different frequency components of image data and electronic watermark embedding method 失效
电子水印嵌入装置，用于将图像数据和电子水印嵌入方法的不同频率分量中的电子水印信息选择性地嵌入

Electronic watermark embedding apparatus for selectively embedding electronic watermark information in different frequency components of image data and electronic watermark embedding method
Abstract:
An electronic watermark embedding apparatus and an electronic watermark embedding method can severally deal with both of the resistance property of an electronic watermark and the prevention of image quality deterioration. Electronic watermark information of a high importance level is embedded in a component having a strong resistance property, and electronic watermark information of a low importance level is embedded in a component exerting little influence on an image quality. As a result, the electronic watermark information to be embedded in the component having a strong resistance property is limited to that of a high importance level. Moreover, the image quality deterioration can be suppressed in comparison with the case of embedding all pieces of information, and the electronic watermark information of low importance level is embedded in the component having a weak resistance property but exerting little influence on an image quality.
Abstract(Chinese):

电子水印嵌入装置和电子水印嵌入方法可以分别处理电子水印的电阻特性和防止图像质量劣化。 将具有高重要度的电子水印信息嵌入到具有强电阻特性的分量中，并且将低重要度级别的电子水印信息嵌入到对图像质量几乎没有影响的分量中。 结果，要嵌入具有较强电阻特性的部件中的电子水印信息被限制在高重要程度的电子水印信息。 此外，与嵌入所有信息的情况相比，可以抑制图像质量劣化，并且将低重要度级别的电子水印信息嵌入具有弱电阻性能但对图像质量影响不大的部件中。

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