Nowadays, vision systems in portable computers are becoming an important tool for personal use. Vision systems for object localization are an active area of research. This dissertation proposes an algorithm to locate position and objects in a regular environment with the use of a simple webcam and a personal computer. To that end, we use two algorithms of marker tracking to reboot often a Visual Simultaneous Localisation and Mapping algorithm. This dissertation also presents an implementation and a set of tests that validate the proposed algorithm.