A comparative study of some images watermarking algorithms

The advancement of transfer technology and sharing of digital data has made of the protection of intellectual property a pressing need. The concept of digital watermarking was emerged as a solution to this problem. This new technology involves inserting a mark in the image (watermark), which characterizes the owner. The insertion can be done in a different manner depending on the length of the message to be inserted and the desired robustness. In this paper we will simulate some watermarking algorithms and their resistance during extraction of the mark, to two types of attacks (Gaussian noise, rotation 90 °) , subjected to the watermarked image while providing the experimental results and the difference between each of these algorithms.