Digital Image Watermarking Using 3 level Discrete Wavelet Transform

Abstract

In this paper a digital image watermarking based on 3 level discrete wavelet transform (DWT) is presented & compare it with 1 & 2 levels DWT. In this technique a multi-bit watermark is embedded into the low frequency sub-band of a cover image by using alpha blending technique. During embedding, watermark image is dispersed within the original image depending upon the scaling factor of alpha blending technique. Extraction of the watermark image is done by using same scaling factor as for embedding. Performance of method for different value of scaling factor is analyses & compare with 1& 2 levels DWT method by using statistical parameters such as peaksignal-to-noise-ratio (PSNR) and mean square error (MSE).Keywords: List four to six keywords which characterize the article. Key word— Image watermarking, 3 level DWT, Alpha Blending, MSE, PSNR