Overview

Digital Watermarking (DWM) is a technique of protecting digital data. This code base implements 2 methods for marking digital images based on Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT).
Several attacks (signal degradations such as noise, dithering, filtering, cropping, lossy JPEG compression) on marked image were conducted. Attacked images are saved and the watermark is extracted.
Robustness of DWT vs DCT is graded based on the quality of extracted watermark. The measure used is the Correlation coefficient (0-100% or 0-1).