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We propose a car navigation system using an Augmented Reality (AR) technique that consists in (I) taking a real-time video using an equipped camera on front of the vehicle, (II) extracting road geometry information from the video by a Computer Vision technique, (III) modeling three-dimensional Computer Graphics (3D-CG) by a CG technique, and (IV) overlaying the 3D-CG into the real-time video. There are two advantages in our system. One is the reduction in cost to model detailed 3D-CG data by collecting and analyzing road geometry information in real-time. The other is to improve high instantaneous visibility in car navigation display by an AR technique. The result of the investigation of comparing an ordinary display method with our display method for availability for car navigation is that 85% of 100 examinees have preferred our display method instead of the ordinary 3D-CG display method. The challenges and future works of the proposed method simple AR system are described by the experimental result of an implementation in prototype phase and a simulation of our method. :

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