Analisis Watermarking Menggunakan Metode Discrete Cosine Transform (DCT) dan Discrete Fourier Transform (DFT)

Digital image watermarking is the insertion of watermarks into digital media. Several types methods used are Discrete Cosine Transform (DCT) and Fourier (DFT). Both these work in frequency domain (transform). using carried out on coefficient. This study 30 data as material for watermaking analysis with 10 each binary, grayscale color images jpg, png bmp formats. binary domains conversions from true (RGB) domain. includes three main processes, namely embedding watermarked original image, extracting measuring correlation between two images. Correlation aims to measure variables that have same relationship. The technology this research MATLAB (Matrix Laboratory) a high-performance programming language computing solving problems solutions expressed mathematical notation. results discussion prove process terms color, DCT, RGB better DFT. And process, type watermark inserted, both DCT DFT, good an invisible watermark.