| At present,the most widely used in reverse modeling equipment used equipment is based on grating projection technology of 3 d laser scanner.This equipment has high accuracy,high system stability,etc.But due to the limitation of calculation and measurement principle,measurement range 3 d laser scanner is small,affected by external environment,such as topography,temperature,and complex operation.Photogrammetry technology to the development of 3 d model reconstruction technology brings a huge innovation,the technology has not only the advantages of simple operation,strong applicability,low cost,and the realistic reconstruction model is stronger,is widely used in project planning,coordination,measurement,deformation monitoring,virtual reality,BIM modeling,etc.Precision photogrammetry,however,is subject to a variety of conditions,the development of reverse modeling technology of photogrammetry technology is increasingly urgent demand,therefore,the research of 3 d reconstruction technology based on image accuracy improving scheme,and summarizes a set of mature photogrammetry technology and applied it in the heart of the reverse engineering with strong theoretical value and practical significance.In order to improve the modeling precision of photogrammetry and complete set technology research,in this paper the calculation method of reverse modeling,the choice of the camera and the shot distance,shooting methods,such as the determination of control points and add impact accuracy is analyzed,the key nodes in the first place in the understanding of photogrammetry based on the calculation methods of optimization,secondly by many field experiments for filming equipment,camera shooting,shooting methods,like set and determination of control points,summed up the meet the need of reverse modeling precision photogrammetry technology.Then use a SONY alpha 7 r camera and md4-1000 type of unmanned aerial vehicle based on aerial survey and ground photogrammetry taken two different approaches to the heart of the Yellow River and tumed right flag will power plant pier,after processing in the industry through the software pix4 d import CAD or 3dmax edit it is concluded that meet the accuracy requirement of 3 d model and a complete set of technology development. |
