Digital Watermarking in Wavelet Domain

In this paper we propose a wavelet transform based watermarking method. The wavelet coefficients of the watermark are embedded to the most significant coefficients at the low and high frequency bands of the discrete wavelet transform of an image. A multeresolution nature of wavelet transform can be exploit in the process of detection. Experimental results show that the proposed watermarking method results in almost invisible difference between the watermarked image and the original image. Moreover, proposed watermarking method is robust to DCT and wavelet based lossy image compression techniques, and some image processing operations like image resizing and cropping.