The Fast Processing Technology Of The Photogrammetric Data Captured By Domestic Large-array Digital Aerial Camera DMZ ?

In the new situation that the digital aerial camera has replaced the traditional analog aerial camera as the main way of photogrammetry data acquisition,it is of great theoretical and practical significance to study the fast processing technology of the large-array digital aerial image.Recently,with the gradual improvement of the graphics processing unit(GPU)cost-effectiveness and the continuous update of the computing unit device architecture(CUDA),more and more scholars have started to use CUDA to improve the efficiency of photogrammetric data processing.Therefore,this paper mainly studies,based on the photogrammetric data captured by composite large-area array CCD camera DMZ ?,the fast radiation correction method,the fast generation method of equivalent virtual image,and the fast geometry correction algorithm supported by POS data.And its research works have a certain reference and application value in promoting on the study of the fast processing method of photogrammetric data captured by large-array digital aerial camera.The main achievements and contributions of the thesis are embodied in the following aspects:1.On the basis of an in-depth study of DMZ ? camera radiation characteristics,using the laboratory integrating sphere data captured by the DMZ ? camera make the radiation correction model,and the radiation distortions in the original array image were eliminated by using the normalized radiation correction method.Meanwhile,the CPU serial algorithm and the GPU parallel algorithm program is programmed respectively,and the fast radiation correction of array aerial image is completed.The results show that,compared with the serial algorithm of CPU,the proposed GPU rapid radiation correction algorithm has achieved more than 13 times acceleration effect.2.For the new technological technology of DMZ ? camera,using Camera calibration parameters establish the transformation relationship from the sub-image to the equivalent virtual image,and the fast generation algorithm of equivalent virtual image designed and programmed.The results show that,the data processing efficiency of the equivalent virtual image fast generation program is significantly better than that of the CPU serial program,and the speedup ratio exceeds 14 times.3.In view of the image point displacement caused by the distortion of DMZ ? camera,the tilt of the picture and the relief of the terrain,the use of camera distortion parameters and high-precision image orientation elements provided by positioning and orientation system(POS),design GPU fast geometry correction algorithm to realize fast geometric correction of area array images.And then,this paper get a region image is obtained.The results show thatthe designed array image rapid geometry correction algorithm can obtain more than 20 times acceleration effect.