Forgery resistant image watermarking technique using discrete cosine transform (DCT)
Hansa Mehra, Silviya Chouhan, Rita Choudhary · 2017
With great demand of internet, it is very difficult to secure data over environment of internet. Watermarking is a technology which deals with security for digital data. It involve the process of superimposing an image (original) on another image (watermark) and results a new image (watermarked) and from the generated image, watermark is also extracted. This paper proposed a frequency domain watermarking process based on discrete cosine transform with different-different size of original and watermark images. It represents comparison of PSNR for various test images and the effect of various noise on selected test images. It also shows correlation of original image with both watermark & watermarked image.