Based on a 2-level discrete wavelet packet (WPT), we implement a robust image watermarking technique, wherein watermark is embedded in some sub-bands of a cover image after using Radon transform with key, for image protection. The insertion and extraction of the watermark in the grayscale cover image is found to be easier compared to other transform techniques. Further, it is shown that the proposed image watermarking method provides better results in terms of statistical parameters such as peak signal noise ratio (PSNR).

watermarking, wavelet packet transform, Radon transform.