Geomatics by fionan

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									                                                                                                          Stereo Image
                                                                                                            Analysis
Geomatics        Radiometric Correction
                 Resampling
                 Epi-polar Geometry
                                       Stereo Images
                                Cross Track / Along Track


                                                            Orbit
                                                            Attitude
                                                            Modelling
                                                            with RPC
                                                                                              Principle of Stereo Image Analysis
                                                                                              Principle Stereo
                                                                         Wherein the Parallax of the
                                                                         image in Right and Left eye
                                                                                                                        Analysis
                                                                                                                  The Co linearity Condition
                                                                                                                  For Exterior Orientation
                                                                                                                                                  The vector connecting the perspective center to
                                                                                                                                                                                                     Problems:
                                                                                                                                                                                                      Identifying Image Position of ground points

                                                                         for the same object is                                                   the image point
                                                                                                                                                         o                                            Measuring these position with known
              Anaglyph & 3D Display                                      perceived as Height/ Depth
                                                                                                                                                               a                                     ground and image reference systems
                                                                                                                                                                 p                                   (Orientations) and hence exact parallax
                                    Image Processing                                                                                                                             f         -f
                                                                                                                                    a
                         Feature Extraction     Feature Matching                                                                a
                                                                                                                                                 The vector connecting the perspective center to       Compute height using Orientation and
                                                                                                                                                 the object point

                           Forstner’s
                                                                                                                                                                                                     parallax equations
                                                    Correlation
                           InterestPoint                                                                                                            A
                           Operator
                                                                                                                                             A
                                                                                                                                                             A
                                                                                                                                                                                                     Solutions
                           Canny Edge               Hausdorff’s                                                                      A
                                                                                                                                                                                                      • Feature Extraction
                           Detector                                                                                                      A                             P                                        • Interest Point Operators
            Reference                               Distance
            DEM From                                                                                                                                                                                            • Edge Detectors
            GPS Etc.
                                                                                                                                                                                                                • Area Features
                                                                                                                                                                                                      • Feature Matching
                        DEM Accuracy        D     Space Intersection                                                                                                                                  • Orbit Attitude Modeling
                                            E     For Elevation         Aerial/ satellite Based Imaging System
                        DEM Display                                                                                                                                                                   • DEM generation and display
                                            M     Computations




                 POINT feature based stereo
                                                                                  Stereo Feature Extraction and Matching
                                                                                 Stereo Feature Extraction and Matching
                          matching                                                                            LINE feature based stereo matching
              Conjugate point Extraction using                                                         Stereo Feature Extraction using Canny edge detector and
              Forstner s Interest Point Operator                                                              Hausdorff s distance measure for Matching
                 and cross correlation based
                          matching




                           Left Image                   Right Image
                                                                                                  Left Image & Edges                                                                                Right Image & Edges


                                                                                    Analysis of CARTOSAT Stereo Images
                                                                                    Analysisof CARTOSAT 1 1 Stereo Images




                                           Aft and Fore Stereo Pair                                               DEM at 10 m interval Min-95.04 m
                                                                                                                   Max 435.65 m in WGS84 Datum                                                              Ortho-Rectified Image




                         Powai lake and its Environ with
                          superimposed 10 m contours                                                                                                  Mumbai
                                                                                           LISS 4 FCC draped over 10 M DEM showing cascading lakes in Mumba




       Centre of Studies in Resources Engineering
                          Indian Institute of Technology, Bombay

                                           http://www.csre.iitb.ac.in/

								
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