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In recent years, several encryption schemes have been proposed to protect data from unauthorized access. It is not suitable to use traditional encryption algorithms for image encryption which were proposed for textual data. The encryption schemes used for images are computationally expensive and power hungry, hence not suitable for mobile phone devices. In this paper, an image encryption scheme is...
Process capability index (PCI) is used to quantify the process performance and is becoming an attracted area of research. A variability measure plays an important role in PCI. The interquartile range (IQR) or the median absolute deviation (MAD) is commonly used for a variability measure in estimating PCI when a process follows a non-normal distribution In this paper, the efficacy of the IQR and MAD-based...
A novel blind color image watermarking technique using singular value decomposition and principal component analysis is proposed in this paper. In addition to two most difficult challenges; robustness and imperceptibility, two other concerns; capacity and security are given special attention in designing the proposed technique. The use of principal component analysis causes improvement in terms of...
A robust image watermarking scheme based on human visual system is proposed. The perceptual quality of the watermarked image is controlled by determining adaptive scaling factor for each individual pixel value. To determine the adaptive scaling factor, human visual system (texture masking) and fuzzy inference systems were used. The quality of the proposed scheme is tested against various attacks (Histogram...
A robust color image watermarking scheme is proposed, in which a color watermark is embedded into a color image. Principle component analysis is used to uncorrelate the R, G and B channels of both the images. Each channel of color watermark is embedded into singular values of corresponding channel of cover image after discrete wavelet decomposition. As original image is required at the time of extraction...
In this paper a watermarking technique has been proposed. The proposed watermarking technique has been incorporated in the JPEG compression standard. Unlike conventional watermarking techniques which are generally based on manipulation of the AC component in DCT domain, the proposed approach utilizes the DC component that is perceptually significant part, to embed the watermark. The watermark embedding...
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