Arnold transform based Security Enhancement using Digital Image Watermarking with Complex Wavelet Transform

Digital image security is of utmost importance in today’s scenario. This paper proposes a novel type of image security method involving Arnold transformation and frequency domain transformation i.e. Dual Tree Complex wavelet transform (DTCWT) .The main idea here is to decompose the cover image into sub-bands using dual tree complex wavelet transform and then applying Arnold Transform to the watermark image and again DTCWT is applied to encrypted image. Finally watermarking rule is applied and watermarked image is obtained. Here we are aiming at comparing the performance of extracting the watermark from different sub planes of complex wavelet transform which has not been done so far. A detailed analysis is carried out to compare the performances against attacks in various subplanes. The experimental results clearly show a better visual imperceptibility and an excellent resiliency of the proposed watermarking scheme against various types of attacks. The security is evaluated using a correlation coefficient and PSNR values.