关键词: 智能手机, 视觉定位, 图像匹配, 摄影测量

Abstract: Smart phones spread rapidly that localization methods using smart phones are becoming a concern. Smart phones always have a camera as well as an operational capability. So this paper presents a visual localization method based on photogrammetry. The method builds a database of reference images for service region in advance. When a phone enters this region, it shoots a real-time image using its camera, then two reference images which have same overlaps with the real-time image are searched by matching algorithm to get their overlapped points. According to the information of these two reference images, it can calculate the corresponding space-coordinates of these points using the fore-intersection. And then a resection method is used with these points to resolve location and attitude of the phone user. Results show that localization using this method can get an accuracy of just meters.

Key words: smart phone, visual localization, image match, photogrammetry