FDCT-Based Digital Watermarking Algorithm for Gray Images

Digital watermarking technology means that the hidden information is embedded in digital multimedia data by way of signal processing. In this paper, we firstly analyze the Fast Discrete Curvelet Transforms (FDCT) and Discrete Wavelet Transforms (DWT) which are usually used in image processing and figure out that DWT can not approximate optimally the image which contains the line singularity. And then a new encrypted embedded algorithm is presented based on FDCT. Based on bit-plane of gray image, the algorithm makes use of the advantage of FDCT and the watermark is encrypted by Chaotic Map and Arnold Transforms (AT) which is imbedded into the proper coefficient of FDCT. The result of our experiment shows that this algorithm is robust and transparent compared with DWT.