In this paper we propose AR-Navi, an in-vehicle navigation system that uses video-based augmented reality technology. AR-Navi includes an in-vehicle camera, which captures real-time video, and displays the guidance which overlays the video display. To solve several problems that arise when real-time video is used, we propose registration adjustment based on recognizing crosswalks and filtering images based on evaluated values. We have built and tested an AR-Navi prototype that uses the proposed methods and confirmed that the system can achieve registration accuracy for driver route guidance at intersections.