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Insertion and decoding method for additional information in an image, such as a watermark, extracting and spectrally transforming components of a frequency sub-band, and modulating sub-group of coefficients of the transformation
Insertion and decoding method for additional information in an image, such as a watermark, extracting and spectrally transforming components of a frequency sub-band, and modulating sub-group of coefficients of the transformation
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机译:图像中附加信息的插入和解码方法,例如水印,提取和频谱变换频率子带的分量以及调制变换系数的子组
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摘要
The method involves multi-resolution spectral breaking down (E1) of image data, extraction (E2) of a frequency sub-band, spectrally transforming it (E3) and choosing (E4) a sub-group of coefficients of the transformation. The coefficients are modulated (E5) to insert supplementary information and an inverse spectral transformation of the coefficients, including the modulated sub-group, is performed before recombining the marked image data. Independent claims are included for a device for inserting supplementary information, a method and device for decoding the information, a digital signal processing device equipped to implement the insertion method, a digital photography device, a computer and database management system, a scanner, and a medical imaging device.
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