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In order to improve detection probability of spectrum sensing based on fractional lower order moment (FLOM) under impulse noise, an improved algorithm is proposed in this paper. The Myraid filter can effectively suppress the impulse noise, so the received signal with impulse noise is processed by Myraid filter, and then the fractional low order moment value of the filtered signal is calculated and...
On the basis of the watermarking sparse feature in wavelet domain, a novel watermark blind attacking algorithm is proposed, in which the accuracy of the separation matrix was improved, by the using of sparse feature of watermarking distribution in wavelet domain, the original image is used as sparse components, the embedded watermark as noise, and sparse decomposition process associated with the ICA...
According to the most three important performance indicators of digital watermark, in the paper we put forward a new watermark algorithm which combines wavelet fractal with BSS (blind signal separation) to realize the embedding, detection and extraction of watermark, and it makes use of the character that the chaotic sequence is sensitive to initial value and random alike, by which the embedding point...
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