FPGA Implementation of 4-D DWT and BPS based Digital Image Watermarking
Journal Title: INTERNATIONAL JOURNAL OF ENGINEERING TRENDS AND TECHNOLOGY - Year 2012, Vol 3, Issue 2
Abstract
In order to protect copyrighted material from illegal duplication, two typical technologies have been developed they are key-based cryptographic techniques and digital watermarks which enable the appropriate security during the transmission process. A digital image watermark consists of signing an image with a signature or copyright message and the message is secretly embedded in the image by using a computer algorithm, using the signature the watermarked image will be detected and extracted. In our paper, we propose a new technique of watermarking, combining both Discrete Wavelet Transform (DWT) and Bit-Plane Slicing (BPS)techniques. In the first unit, we decomposed the image to be watermarked in to four dimensional modified DWT coefficients, by adding pseudo-random codes at the high and middle frequency bands of the DWT of an image. In the second unit, a key has been generated from LHLH frequency bands of the 4-Level DWT image and this key is watermarked in to the original gray image. In the third unit, for data compression we used bit plane slicing technique where the original gray image is sliced in to 8 planes and we used bit plane 3 to embed in to the key watermarked image. The embedded key watermarked image is transmitted and the key watermarks are extracted with robustness. Using our technique, the processing time of the extraction of the watermark has been reduced and the peak signal-to-noise ratio (PSNR) value is improved. We implemented our technique using MATLAB and these units are simulated, synthesized and optimized for Spartan- 3EDB FPGA chips using Active-HDL Version 7.2SE design tools
Authors and Affiliations
S. Bhargav Kumar#1 , K. Esther Rani*2
Keywords
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