Research Of Three-dimensional Modeling Based On The Oblique Photography Of Leica PCD30 Camera

It is the mainstream trend of 3d modeling of urban landscape.In this paper,based on the Leica RCD30 oblique images,it mainly studies the office operation and outside work,to explore a suitable way for oblique photography,realizing maximum efficiency and precision of data acquisition.In image matching,it researches oblique image matching algorithm based on the characteristics of constant and its preliminary application.Finally it emphatically analyzed the key technologies such as automatic mapping,research for the dense texture and condition of the existence.In this paper,the contents and results of the research are mainly concentrated in the following respects:(1)Compared with the aerial images,the Oblique image data have the large dip Angle,large scale and large difference of imaging characteristics,which make the aerial triangulation turning point difficultly and inefficiently.For this point,the RCD30 oblique camera image of aerial photography use GPS/IMU system,integrating GPS and IMU,which can get a set of convenient and precise resumption of oblique image location.(2)For the problem of the low efficiency of traditional ASIFT matching algorithm,based on knowledge and conditions related to the image matching,it put forward a kind of the improved ASIFT algorithm,make original image for an inverse affine transformation to bring back to approximate photography,let the precision and efficiency effectively improved.In the general case,the improved algorithm matching effect is slightly better than ASIFT algorithm,and the efficiency of matching is more than 100 times.(3)For the intensive inevitable problem in the 3D reconstruction of buildings,the regular block processing does not eliminate the problem.In this paper,based on the terrain surface projection matrix block is mapped to the image,the combination of two-dimensional photography distance of the processing,reduce its complexity,and establish the sparse grid accelerate texture mapping to achieve intensive buildings block processing.