Ayman M. Ahmed

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The paper presents an image watermarking technique using the naturalness preserving transform (NPT). The goal is to produce an invisible and robust watermark that resists signal processing and geometric distortion attacks. Unlike traditional techniques, the proposed algorithm inserts and extracts the watermark via a special orthogonal transform class in(More)
A comparison between two image-watermarking schemes is demonstrated in this paper. The proposed watermarking techniques use modified forms of the naturalness preserving transform (NPT) to encode a watermark logo image into a host image. The modified NPT forms employ the Hartley and cosine matrices, respectively, instead of the Hadamard matrix used in the(More)
Development of the finite-element-based Integrated Groundwater and Surface-Water Model (IGSM) began in the 1970s. Its popularity grew in the early 1990s with its application to California's Central Valley Groundwater Surface-Water Model in support of the Central Valley Project Improvement Act. Since that time, IGSM has been applied by federal, state, and(More)
This paper presents the technical construction of a standalone vehicle controlled by GSM communication network. The designed GSM based solar powered vehicle could be operated from almost anywhere under GSM network which is powered by solar energy using 5 watt photo voltaic (PV) panel, stored in 3 similar 4V rechargeable batteries. The operation commences(More)
This paper presents the technical construction of a standalone vehicle controlled by GSM communication network. The designed GSM based solar powered vehicle could be operated from almost anywhere under GSM network which is powered by solar energy using 5 watt photo voltaic (PV) panel, stored in 3 similar 4V rechargeable batteries. The operation commences(More)
Hyperspectral imaging has been widely studied in many applications; this type of sensors is imaging spectrometry sensors, which divide the waveband into hundreds of contiguous narrow bands for analysis. These images provide much richer and finer spectral information than traditional multispectral images do. Hyperspectral satellite images require enormous(More)
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