3 In this research work, a complete quality study of our
4 scheme~\cite{fgb11:ip} has been given, namely robustness,
5 completness, and correctness.
6 This scheme is now ready for practical
9 To improve again the robustness, notice that the definition of $x$
10 can be changed as follows: at worst, any process wich always returns
11 the same set of bits for a given image would return an amanable vector.
12 However, the most fine would be the set of bits whose modifications minimize
13 a distortion function. Following such idea we plan to combine this bit
14 selection step with feature extraction function.
