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Rightful ownership of images is indispensible. Watermarking provide such claims. In this paper, we embed our watermarks in the two subbands (HL and LH) of the DWT of the image. Simulation results demonstrate the presence of watermark against very high compression JPEG as well as against several attacks such as Gaussian-noise, resizing, and low pass filtering.
In this paper, we proposed a new algorithm for digital audio watermarking process using Empirical Mode Decomposition (EMD) and Hilbert Transform (HT). The host audio signal is decomposed into several Intrinsic Mode Functions (IMFs). A set of -1 and 1, which is obtained by mapping from standard normal distributed pseudo random numbers, is embedded as secret information into the IMF containing highest...
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