The transform domain watermarking is achieving very much success as compared to the
spatial domain watermarking. In the transform domain watermarking, the image is
represented in the form of frequency. In the transform domain watermarking techniques,
firstly the original image is converted by a predefined transformation. Then the watermark is
embedded in the transform image or in the transformation coefficients. Finally, the inverse
transform is performed to obtain the watermarked image [14]. Most commonly used
transform domain methods is Discrete Cosine Transform (DCT), Discrete Wavelet Transform
(DWT) and Discrete Fourier Transform (DFT)