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Blind Digital Watermarking Method Based on Quadtree Decomposition and Complex Wavelet Transform for Medical Application

A digital watermarking scheme based on dual-tree complex wavelet transform (DTCWT), and the quadtree (QR) is suggested in this paper, in this technique the DTCWT is exerted on the host image as a first step in the process, then decomposing the low frequencies using the quadtree which illustrates the data structure, to obtain a suitable position for the watermark insertion, once the decomposition is done, the watermark is incorporated in the consequent block of the quadtree using a blind embedding function based on quantization. At the extraction phase, the watermarked image is treated similarly to the embedding phase, then an extraction formula based is applied to retrieve the watermark. The experiments had shown the superior results achieved in terms of high fidelity and similitude, furthermore, a comparison was effectuated as well as to prove the suggested technique’s effectiveness.