Research On The Key Technology Of The City Imaging Navigation

The technology of the city imaging navigation is a navigation method which utilizes real images,it is a new way of navigating the map,which can build imaging navigation maps with the easiest and quickest way to capture images.The real images have more abundant map service,better promote visual effect,build the new visual experience and achieve a "perspective" of the map browsing experience than two-dimensional map.It also solves the problems that there-dimensional map have the disadvantages of large amount of data and long production period.It is of vital significance to study the key technology of imaging navigation.The main work and contributions are as follows:(1)The main acquisition methods of the real navigation data are studied,aiming at the three cases of pure rotation,spatial point coplanarity and spatial point difference,the correlation of the adjacent frame images is deduced respectively,and designs the method that based on Mysql real navigation database structure and image data.(2)The adjacent frame image mosaic method that based on the feature point is studied.It utilizes SIFT algorithm for feature point detection and extraction,the K-D tree nearest neighbor search algorithm and BBF algorithm are used to match the feature points.Based on the RANSAC algorithm,an algorithm of purifying matching by spatial geometric constraint is presented.The experimental results show the algorithm improves the computational efficiency while satisfying the effect of image mosaic.(3)The idea and algorithm of associating the image data with the spatial position in the process of database storage are put forward and realized.(4)The transformation of different view images in real navigation process is studied and realized.(5)The real navigation experiment system is designed,which realizes the image stitching,the location points,the function of real-time call and display in real navigation.