Abstract
This paper is concerned with the digital image watermarking techniques to protect intellectual property and to authenticate digital images. Different from the most conventional methods using the discrete cosine transforms (DCT) and discrete-wavelet transforms (DWTs), this paper exploits the improved Laplacian pyramid transform to develop a new image watermarking scheme in which the improved Laplacian pyramid transform is used to decompose and reconstruct the host image. Then, to select an appropriate watermarking solution, we investigate the various frequency sub-band regions with different the levels and strength factors to perform the watermark embedding. Finally, we conduct experiments to investigate the invisibility and robustness of the proposed algorithm in terms the peak signal-to-noise ratio (PSNR), normalized correlation (NC), and structural similarity index (SSIM). Experimental results showed that our proposed scheme offers good robustness and invisibility. As compared to the watermarking schemes using the curvelets, our watermarking scheme is more robust for the lossy JPEG compression and Gaussian low pass filtering attacks. In addition, our method is also efficient in terms of computational time.
Highlights
Since the rapid development of communication networks and advances in digital signal processing have lead to the multimedia piracy issues, copyright protection of multimedia products has become an extensive research topic
Experimental results showed the advantages of their method as compared to a watermarking scheme in the discrete cosine transforms (DCT)-discrete-wavelet transforms (DWTs) combined domain for the lossy JPEG compression attacks, speckle and Gaussian noise
The block diagram for analysis and synthesis of the Laplacian pyramid (LP) is shown in Figure 3 in which x is the input signal, output c is a coarse approximation while output d is a difference between the original signal and the prediction p [14, 15]
Summary
This paper is concerned with the digital image watermarking techniques to protect intellectual property and to authenticate digital images. Different from the most conventional methods using the discrete cosine transforms (DCT) and discrete-wavelet transforms (DWTs), this paper exploits the improved Laplacian pyramid transform to develop a new image watermarking scheme in which the improved Laplacian pyramid transform is used to decompose and reconstruct the host image. To select an appropriate watermarking solution, we investigate the various frequency sub-band regions with different the levels and strength factors to perform the watermark embedding. We conduct experiments to investigate the invisibility and robustness of the proposed algorithm in terms the peak signal-to-noise ratio (PSNR), normalized correlation (NC), and structural similarity index (SSIM). Experimental results showed that our proposed scheme offers good robustness and invisibility. Povzetek: Clanek predstavlja novo obliko zašcite slik s pomocjo Laplacove piramidne transformacije
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have