Digital watermarking of images for copyright protection

• Main Author: Wang, Hung Ju.
• Other Authors: Ang, Yew Hock
• Format: Theses and Dissertations
• Language: English
• Published: 2008
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Computer hardware, software and systems
• Online Access: http://hdl.handle.net/10356/13202
• Institution: Nanyang Technological University

In the digital domain, digital images are being easily circulated and copied over the network. Digital watermarking has emerged as a new technology to provide copyright protection and deter illicit copying and plagiarism of digital images. This research is to identify and develop a digital watermarking scheme that embeds an invisible digital watermark onto a still image without significantly affecting its image quality. A method based on the frequency domain DCT (Direct Cosine Transform) algorithm and human visual system is developed in this project. The energy distribution of DCT coefficients is examined and took into consideration for modulated with copyright information.