Three Dimensional Modeling And Precision Analysis Of Multi Tilt Rotor Single Shot UAV Tilt Photography

In recent years,the aerial tilt photogrammetry technology has become a new technology in the field of Surveying and mapping,and it is an important means of three-dimensional geographic information acquisition.Aerial tilt photogrammetry technology carries multiple or single high-pixel visible light cameras on remote sensing platforms such as unmanned aerial vehicles(UAVs)to take multi-angle or multi-time photographs of the target,and completes the three-dimensional model building and three-dimensional information acquisition of the target according to multi-view images.At present,the popular multi-jigsaw camera can use multi-rotor or fixed wing as the aircraft.Compared with single lens,the advantage of multi-jigsaw camera is that it can collect tilted images from multiple views at one time.However,its equipment is expensive and needs a large unmanned aerial vehicle as a platform to carry out tasks.Its portability and ease of use are comparatively high.Poor.In contrast,single lens has the advantage of low cost,low requirements for aircraft,flexible maneuvering suitable for small-scale fast operation,but its shortcomings are also obvious,that is,it requires multiple flights to complete the acquisition of tilted images.With the development and maturity of three-dimensional modeling technology for aeronautical tilt measurement,the requirement of tilt image attitude is greatly reduced.Multi-rotor UAV has become a supplement to tilt photography flight platform in recent years.It has the advantages of stable flight performance,good development and modification potential,low operation difficulty,low purchase cost and maintenance cost.Therefore,it is undoubtedly an economical choice to use multi-rotor UAV to acquire the desired tilt image.However,the application of multi-rotor UAV is limited by its light load and short life.If the UAV can carry a more portable and flexible single-lens camera to collect image data,according to the need to shoot the area to determine the UAV shooting path,get the same shooting efficiency as multi-lens equipment,and can reduce equipment costs,reduce the weight of UAV,increase battery life time..This method can not only enrich the oblique image acquisition,but also complement the advantages of the traditional multi-lens oblique photography scheme.According to the principle of tilt photogrammetry and the characteristics of multi-rotor UAV,this paper systematically studies the single-lens tilt photography and three-dimensional modeling technology of multi-rotor UAV from the aspects of the selection of flight platform and aerial camera,the design of tilt photographic route of single-lens UAV,and so on.To a degree,it is feasible to replace the high cost five lens tilt photography in engineering application.The main research contents are as follows:(1)On the basis of analyzing the principle of tilting photogrammetry,this paper puts forward the idea of data acquisition based on single lens tilting aerophotography,and realizes the acquisition of single lens tilting aerophotography through hardware selection,route design and flight planning.(2)In 3d modeling,the main difficulties of color balance are summarized according to the characteristics of multi-angle aerial photography.In the pretreatment of the image tilt,figure out a step-by-step grading of color balance for statistical parameter of image processing methods,and in accordance with the related tools of Photoshop and statistical parameters,pictures after dark Angle correction,saturation adjustment,brightness and hue adjustment steps,solve the problem of a lot of visual aerial photography pictures of various color,has realized the multiple points of view aerial photography pictures statistical parameter calculation and color balance batch automation(3)The accuracy of the three-dimensional model of multi-rotor single-lens unmanned aerial vehicle tilt measurement is studied and analyzed.For aerial photography data,through the field image control point measurement and internal data processing,compare the advantages and disadvantages of single-lens and five-lens tilt photogrammetry in flight platform and aerial camera,and model the images acquired in the two modes.And compare the modeling efficiency and the model effect to verify the feasibility of single-lens tilt photogrammetry,evaluate the plane precision,elevation precision and length precision of the 3D model results,and use multi-rotor single-lens drone.The scientific basis for the production and application of aerial photography systems.