• Madhuri Sitaram Hakke

This paper presents a robust image watermarking scheme on gray level images, which is based on two level DCT (Discrete Cosine Transform) transform. In that first we compute the DCT of host image, then using the DC coefficients construct a low-resolution approximation image. Again we apply the DCT on the low-resolution approximation image and then added a pseudo-random noise sequence into its high frequencies. For watermark detection; from the watermarked image we extract the approximation image and then same noise sequence is generated. Experimental result shows that the hidden watermark is robust against many common attacks such as additive Gaussian noise, salt and pepper noise addition, speckle noise addition and median filtering.

Blind digital watermarking, DCT, PSNR, NC

"Robust image watermarking based on two level DCT", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.394-399, June 2019, Available :http://www.jetir.org/papers/JETIR1907R64.pdf

"Robust image watermarking based on two level DCT", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp394-399, June 2019, Available at : http://www.jetir.org/papers/JETIR1907R64.pdf