A novel DWT based invisible watermarking technique for digital images

الملخص EN

With the rapid development of internet and multimedia technology, the requirement of copyright protection becomes more and more urgent.

Digital Watermarking is a technique which finds solution to this problem.

The aim of this paper is to propose an innovative watermarking scheme which utilizes the perceptual information of the image content to generate watermark.

According to this, the disparity values between low frequency sub band of wavelet domain and the rescaled version of original image are identified as the watermark and are disordered with the help of Arnold Transform.

The operation of embedding and extraction of watermark is done in high frequency domain of Discrete Wavelet Transform since small modifications in this domain are not perceived by human eyes.

This watermarking scheme deals with the extraction of the watermark information in the absence of original image, hence the blind scheme was obtained.

Peak Signal to Noise Ratio (PSNR) and Similarity Ratio (SR) are computed to measure image quality.

In addition, the competency of the proposed method is verified under common image processing operations and a comparative study is made against our previous technique [8 ].