We propose a generic model for designing systems relying on augmented reality techniques in the context of Immersive Documentation Environment (IDE). This model encompasses user/system interaction paradigm, system architecture and exploitation scenario. We illustrate the use of this model on several virtually documented environment systems providing the user with enhanced interaction capabilities. These systems are dedicated to several applications where the operator needs a natural (hands free) access to information, to carry out measurements and/or operate on a devices (e.g. maintenance, instruction). These systems merge live images acquired by a video camera with synthetic data (multimedia documents including CAD models and text) and present the result properly registered in the real world. Vocal commands as well as multimodal interaction, associating speech and gesture, are used to improve interaction.
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