Fast reliable level-lines segments extraction

In this paper, we propose a fast reliable level-line extraction algorithm that could be used as a basic and generic feature extraction algorithm. In many applications, we need to match features extracted from images. The nature of the features will play a significant role for the choice of the matching strategy. Less reliable features lead to very complex matching processes that have to compensate for their sensitivity toward several perturbations like contrast changes. We choose level lines as a basic feature for motion analysis and registration algorithms. Their invariance property toward contrast changes has been proved by several authors and verified experimentally using outdoor complex sequences.