Embedded Zero -Tree Wavelet Based Image Steganography

Image steganography using Discrete Wavelet Transform can attain very good results as compared to traditional methods, in this paper we discuss a method to embed digital watermark based on modifying frequency coefficient in discrete wavelet transform (DWT) domain. This method uses the embedded zero-tree (EZW) algorithm to insert a watermark in discrete wavelet transform domain. EZW is an effective image compression algorithm, having property that image in the bit stream are generated in order of importance. The objective is to watermark the image while maintaining the image quality in terms of signal to noise ratio. The quality of the watermarked image is very close to the original image and it shows high robustness against image processing attacks.