View Full Document

Prospects of Close Range Digital Photogrammetry in large physics installations



View the full content.
View Full Document
View Full Document

1 views

Unformatted text preview:

Prospects of Close Range Digital Photogrammetry in large physics installations C Lasseur C E R N Geneva Switzerland IWAA Argonne October 1997 INTRODUCTION MAIN FEATURES OF THE CERN EQUIPMENT TESTS VALIDATION AND APPLICATIONS TOWARDS THE PHYSICS INSTALLATIONS IN LHC CONCLUSION 2 INTRODUCTION digital photogrammetry specially since the LHC project CERN Positioning Metrology Group since last February n a DCS 460 non metric digital camera plus 18 mm and 24 mm lenses n the Rollei DPA CDW software package 3 MAIN FEATURES OF THE CERN EQUIPMENT The image recording system Nikon N90 camera body CCD full frame imager 18 4 mm 27 6 mm 2036 3060 pixels each image 6Mbytes elements arranged very precisely no expedient for flattening pixel 9 microns two images 1 6 seconds subsequent images at intervals of approximately 8 seconds calibration principal point and principal distance also lens distorsion and affine data image measurement accuracy 1 40 pixel The image analysis the measured variables are the 2D image coordinates of the projected object points image analysis based on detection of object structures discrete and unique points edges retro reflecting targets gray values edges exposure time and aperture optimized for best possible point imaging and a suitable contrast low and high pass filters digital image covers at least 5 pixels coded targets enable fast and automated image measurement ring with code surrounding buttons when space available 4 The multi photo orientation and the bundle adjustment software the software the base for the 3D object coordinates from the 2D image coordinates measurements the reconstruction in an oriented block by spatial ray intersection in addition to image measurements geometrical observations known distances and heights and or given control point coordinates additional observations shape derived from pure photogrammetric information size and location from additional observations information object space THE MULTI PHOTO GIVES THE INITIAL VALUES OF



Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Prospects of Close Range Digital Photogrammetry in large physics installations and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Prospects of Close Range Digital Photogrammetry in large physics installations and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?