Figure 4: (a)-(b) On-device interface of the hybrid tracking and image matching system. The locations of the matched point-of-interest (POI) labels and feature points are adjusted using the motion parameters (translation, rotation, zoom) from the tracking module. (c) A screen shot showing the mini-map overlaid on the viewfinder screen. The previous key frames show
up as rectangles in the mini-map, with their relatively locations preserved in the map. A new key frame is captured when there is enough new content in the current frame. The previous successful match (with a valid POI label) is marked by a red tag on the mini-map.