Irina Nitu, Itoafa Liviu
Based on:
- Chapter 11.1 and 11.2 from [1]
- C implementation of the functions from the author's (Ingemar Cox) site
http://www.cs.ucl.ac.uk/staff/I.Cox
- chapter 11 equations
- lab 1 embedders/extractors
- Erasable watermarks (chapter 11.1.3)
. watermarking with modulo addition, system 16
(embeder: E_MOD, detector: D_LC)
- Semi-Fragile Watermarks (chapter 11.2.2)
. semi-fragile watermarking by quantizing DCT coefficients, system 17
(embeder: E_DCTQ, detector: D_DCTQ)
For testing, the JPEG compression algorithm using DCT [2] was simulated
on images after embedding.
[1] I. Cox, M. Miller, J. Bloom - Digital Watermarking and Steganography, Morgan Kaufmann 2007
[2] K. Cabeen, P. Gent - Image Processing and the Discrete Cosine Transform