An Improved Scheme for Digital Watermarking Based On Discrete Cosine Transformations
Ajay Goel, O.P. Sahu, Rupesh Gupta, Sheifali Gupta · Global Journal of Human Social Science · 2010
Digital Watermarking is a technology of embedding watermark with intellectual property rights into images, videos, audios and other multimedia data by a certain algorithm. The basic characteristics of digital watermark are imperceptible, security, reliability, low complexity of watermarking algorithm and security of the hiding place. Digital Watermarking Algorithm is composed of three parts: watermark embedding algorithm, the watermark extraction algorithm and the watermark detection algorithm. Future research of digital watermarking technology will focus on the watermarking algorithm, the study of watermarking theories, the watermark attacks and the evaluation system of watermarking system. A robust digital watermarking approach is proposed using the modified discrete cosine transformation (MDCT). The quality of the watermarked image is high and is robust to compression, noises, filtering and geometric transformations.