An alternative watermarking scheme using sequency ordered hadamard transform (SCHT)

• Main Author: Chong, Nicholas Wei En.
• Other Authors: Ng Boon Poh
• Format: Final Year Project
• Language: English
• Published: 2011
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Electronic systems::signal processing
• Online Access: http://hdl.handle.net/10356/45383
• Institution: Nanyang Technological University

This report will explore and present the possibility of a new image watermarking scheme using the Real Conjugate Symmetric Sequency-ordered Complex Hadamard Transform (rCS-SCHT). This rCS-SCHT, which has a sequency ordered transform matrix and conjugated symmetric spectrum, has been found to achieve better results in image compression that even surpasses that of the Sequence Ordered Walsh Transform (SOWT) and the Discrete Cosine Transform (DCT) [1]. Implementation and testing of the watermarking scheme would be done purely using MATLAB. Methodology of the new scheme would be referenced from a recently developed blind watermarking scheme that uses the Fast Hadamard Transform (FHT). Testing of the new scheme mainly includes comparison of results with a similar scheme using Walsh Hadamard Transform (WHT) instead of rCS-SCHT. Watermark robustness will be measured with Peak Signal to Noise Ratio (PSNR), Normalized Correlation (NC) and number of error bits.