Image watermarking technique in MDCT domain exploiting the properties of the JND model
Maha Bellaaj, Kaïs Ouni · 2014
In this paper, we will present a watermarking technique for image. Our proposed technique operates in the frequency domain. We will apply the MDCT (Modified Discrete Cosine Transform) on the original image to pass from temporal domain to frequency domain. We exploited the proprieties of the JND (Just Noticeable Difference) model to search the places for insertion of the watermark to optimize the imperceptibility criterion of the mark at the insertion phase of the proposed technique. To ensure maximum capacity of insertion, we will duplicate the bits of the brand N times and then each bit is inserted in the LSB (Least Significant Bit) of the components sought by JND model. In order to increase the detection rates, we used Hamming code as error correction code. We evaluated the invisibility of the technique by calculating the PSNR, the Structural Similarity Metric (SSIM). We studied the robustness of this technique against the different attacks given by checkmark. Finally, to highlight our results, we compared the proposed technique with some other existing techniques.