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A watermarking approach based on multidimensional time-frequency analysis is proposed. It represents a unified concept that can be used for different types of data such as audio, speech signals, images or video. Time-frequency analysis is employed for speech signals, while space/spatial-frequency analysis is used for images. Their combination is applied for video signals. Particularly, we focus on...
An image watermarking procedure in the space/spatial-frequency domain is proposed. Space/spatial-frequency regions to be watermarked are selected by using the two-dimensional spectrogram. In order to provide both the imperceptibility and robustness of the procedure, a watermark is modeled according to the specific characteristics of pixelspsila regions. The inversion from the space/spatial-frequency...
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