In this paper, a saliency-based digital watermarking system which employs a higher degree security by means of Symmetric Key Cryptography is proposed. The projected algorithm can implant more information into less perceptive areas within the original image determined by saliency map. The scheme helps to detect the regions that have better data hiding capacity within an image. The locations with less perceptibility specifies the most insignificant location from the view of visibility within an image, so any alteration within these locations will be less apparent to any spectator. Moreover, the watermark is encrypted with Symmetric Key Cryptography to make it secure from the attackers. Here the algorithm is tested by means of imperceptibility and robustness.
The present paper realises the attenuator and amplifier of electromagnetic signals with silicon-based, square-type photonic crystal fiber. In this research, the input signal varies from 30 eV to 30,000 eV, which lies within the x-ray regime. The operational mechanism deals with the electric field distribution in the structure, which is carried out using the plane wave expansion technique. The numerical outcomes affirm that the increasing and decreasing amplitudes of incident signals occur at the output end of the fiber. The intrinsic mechanism of such an interesting result is nonlinear properties of field distribution at a different value of lattice spacing and the diameter of the proposed fiber's air holes. Finally, the immediate upshot's outcome resembles the amplifier and attenuator about the optical system.
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