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This work reports the anti-plasmodial activities of Warburgia ugandensis and Zanthoxylum usambarense commonly used as phytomedicines against malaria by some Kenyan communities.To determine the anti-plasmodial activities of extracts from Warburgia ugandensis and Zanthoxylum usambarense against Plasmodium knowlesi and Plasmodium berghei.Eight plant extracts were screened for in vitro anti-plasmodial...
A wavelet based robust image watermarking scheme in which a binary image is embedded in the horizontal and vertical quadrants of a wavelet transformed image is proposed. The algorithm exploits the inter-coefficients relationship within a DWT block of a predetermined size. Only one wavelet coefficient is perturbed slightly in order to embed a single bit of the watermark and also to produce a watermarked...
A digital image watermarking scheme that uses invariant centroids to detect and correct geometric attacks is proposed. The centroids are determined by computing a convergent geometric moment of a circular region of a predetermined size. These centroids serve as reference points for a region of interest in which a binary image is embedded using a wavelet based method and a private key to enhance robustness...
A robust image watermarking scheme in which a binary image is embedded in the singular values of selected DWT blocks in the horizontal and vertical sub-bands of a 1-level decomposition of a gray-scale image is proposed. The embedded blocks are selected by a secret key to enhance imperceptibility. A watermarked image that is perceptually indistinguishable from the original is obtained. The watermarking...
A new blind digital image watermarking scheme that employs a Hadamard matrix to spread the CDMA watermark in selected DWT coefficients in a gray-level cover image is proposed. The coefficients are obtained from the 1- level DWT Haar decomposition of the image. A binary image is used as a watermark and is embedded to produce a watermarked image that is perceptually indistinguishable from the original...
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