Study of Different Transformation Algorithms in Digital Image Watermarking
Ravish Kumar Dubey, Mandoria H.L. · SSRN Electronic Journal · 2016
There is a big issue related to security on the growth of Internet. This is the era of digital data that is transferred on Internet when data is transferred on the Internet there is a problem of authentication and security to the data. Digital data is in the form of audio, video, images etc. Digital image watermarking is used to hide the data with the cover image for authentication. Many techniques have been proposed for robust, secured, high embedding capacity in the world of digital image watermarking such as DCT, DWT, SVD, Fourier Transformation This paper presents overall techniques that have been used in image watermarking and also we presents the combination of the method such as singular value decomposition (SVD), discrete cosine transformation (DCT), discrete wavelet transformation(DWT), Fourier Transformation. The keynote for image watermarking is PSNR and NC values. PSNR is used to calculate the image quality factor and NC used to measure the robustness of image. Digital image watermarking is done in two ways i.e. block based and frequency based or sometimes we used a hybrid method.