[1910.11185] A blind Robust Image Watermarking Approach exploiting the DFT Magnitude
Our future work will be focused on improving the resistance to other kind of attacks such as scaling, rotation, etc.
Abstract: Due to the current progress in Internet, digital contents (video, audio and
images) are widely used. Distribution of multimedia contents is now faster and
it allows for easy unauthorized reproduction of information. Digital
watermarking came up while trying to solve this problem. Its main idea is to
embed a watermark into a host digital content without affecting its quality.
Moreover, watermarking can be used in several applications such as
authentication, copy control, indexation, Copyright protection, etc. In this
paper, we propose a blind robust image watermarking approach as a solution to
the problem of copyright protection of digital images. The underlying concept
of our method is to apply a discrete cosine transform (DCT) to the magnitude
resulting from a discrete Fourier transform (DFT) applied to the original
image. Then, the watermark is embedded by modifying the coefficients of the DCT
using a secret key to increase security. Experimental results show the
robustness of the proposed technique to a wide range of common attacks, e.g.,
Low-Pass Gaussian Filtering, JPEG compression, Gaussian noise, salt & pepper
noise, Gaussian Smoothing and Histogram equalization. The proposed method
achieves a Peak signal-to-noise-ration (PSNR) value greater than 66 (dB) and
ensures a perfect watermark extraction.
‹Fig. 1: The middle band DCT coefficients where the watermark is embedded. (Proposed scheme)Fig. 2: Embedding scheme. (Proposed scheme)Fig. 3: Extracting scheme. (Watermark Extraction)