Research On Relative Radiation Correction Method Of DMZ ? Image For New Aerial Camera

With the progress of photogrammetry technology,large area array CCD digital aerial camera has become one of the main means to obtain aerial remote sensing image,and its camera image preprocessing technology has become a hot spot in photogrammetry research.In the process of digital aerial image preprocessing,radiation correction is the first link,and it is also a very important link.Radiation correction is directly affecting the quality of follow-up work of image preprocessing.In this paper,the preprocessing technology of DMZ ? camera with digital multi-faceted digital aerial camera is studied.The characteristics of DMZ ? camera are analyzed and the radiation characteristics of DMZ ? camera are analyzed and summarized.Put forward a radiation correction algorithm that fit for the DMZ ? camera full-color image and multi-spectral image,and through the test to verify the effectiveness and applicability of the method.The main contents of this paper include:1.This paper reviews the development history of digital aerial camera,introduces the background and development of large-scale array CCD aerial camera at home and abroad,analyzes the performance and pretreatment technology of several mainstream aerial cameras at home and abroad,and introduces the design originality and main features of the new large-scale array Camera DMZ ? camera system.2.The basic principles of DMZ ? imaging of the new aerial camera are described.The radiation errors of the panchromatic camera and the multispectral camera are analyzed,including dark current,CCD device dead pixels,pixel inconsistency error,photographic objective lens distortion and field segmentation error and so on.Then,the correlation characteristics of DMZ ? camera are obtained by statistical analysis of laboratory data,and the results are summarized.3.The research status and basic principle of camera radiation correction are expounded.The principle and process of linear fitting method and normalization method are introduced,and the radiation calibration process is designed.The linear fitting method mainly includes the dark current calculation,the gray scale mean value and the standard deviation calculation,the gray scale mean and the standard deviation calculation,the three steps of calculating the gain and bias and radiation correction;the normalization method Including: dark current calculation,exposure time file selection,radiance file selection,calculation of correction coefficient and pixel-by-pixel radiation correction of five steps.Then,according to the above steps,the linear fitting method and the normalization method are designed respectively.4.This paper introduces the process of airborne image test,and corrects the airborne image by using the relevant algorithm written in VS2012 development environment,and analyzes the correction result of the two methods based on the radiation calibration process and program designed in Chapter 3.The average correction accuracy of the linear fitting method is 4.58%,and the average correction accuracy of the normalization method is 1.12%,and the advantages and disadvantages of the two methods are analyzed.The accuracy of the two methods is evaluated,and there applicability was analyzed.5.This paper summarizes the research work of DMZ ? radiation correction in aerial photogrammetric camera,summarizes the work done in this paper,summarizes the research results and shortcomings of this paper,points out the difficulties of the current research,and puts forward the direction of the next research.The above is the main work of this paper,through the work,the DMZ ? camera image radiation correction,can get high-quality high-definition images for the latter part of the process to provide data base.