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An image-feature based second generation watermarking scheme is proposed in this paper. A host image is firstly transformed into wavelet coefficients and features are extracted from the lowest approximation. Then a watermark sequence is inserted in all high frequency coefficients corresponding to the extracted featured approximation coefficients. Original(More)
BACKGROUND Carotid-cavernous sinus fistula is an old difficulty in neurosurgery. At present, the main way to deal with it is by embolizing the fistula via an arterial route. But if the fistula is small or supplied by several branches, it is difficult to embolize via an arterial approach. METHODS In this report, 21 patients with carotid-cavernous sinus(More)
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