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In this paper, a multiple scaling factor based Semi-Blind watermarking scheme for grayscale image watermarking using Online Sequential Extreme Learning Machine (OS-ELM) is proposed. Four-level DWT is applied on three standard test images of size 512 × 512. LL4 sub-band coefficients are chosen for watermark embedding. OS-ELM is initially tuned with a fixed number of training data used in its initial...
In this paper, a robust blind color image watermarking technique using Online Sequential Extreme Learning Machine (OS-ELM) is proposed. Blue channel is utilized and transformed using DWT. Low frequency LL4 sub-band is used for watermark embedding. A variant of mini-batch machine learning algorithm i.e. OS-ELM is initially tuned with a fixed number of training data used in its initial phase and size...
In this paper, we first present successful transmission of watermarked image Lena using OFDM technique over AWGN wireless channel by using 256-PSK modulation technique. The performance analysis of this transmission is carried out. The visual quality of non-transmitted and transmitted signed images is quantified by computing PSNR. The extraction of watermark from signed image is carried out by using...
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