New Developments in Close Range Photogrammetry from Software Industry s Point of View

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1 New Developments in Close Range Photogrammetry from Software Industry s Point of View Bonn, March 2003 Jürgen Holl, Stuttgart

2 Contents 1. Company Information 2. Products and Services 3. technet s Basic Modules 4. Basic Modules Examples 5. technet s New Developments 6. New Developments Examples 7. Wishes and Goals for the Future

3 Company Information gründig + partner Germany, Berlin, Stuttgart Founded in 1989 Software: Pictran for Close Range Photogrammetry

4 Products and Services Engineering design of leightweight structures. Gallet-Project, Expo 2002 Switzerland technet did the statical analysis of the hybrid system (gallets)

5 Products and Services In the fields of GIS and surveying technet offers products for... Interconnected Transformation of Local Systems Adjustment and Analysis of Geodetic Nets Railway Track Surveying and Planning

6 Products and Services Pictran - Close Range Photogrammetry Applications range from rectification, 3d-modeling to camera calibration. An advanced bundle adjustment program for image orientation and point determination is integrated. The measurement is supported by digital image processing methods. The system guarantees high accuracy and traceable results.

7 Basic Modules The basic modules are: Rectification Bundle block adjustment and camera calibration. 3d-digitizing

8 Basic Modules - Rectification To present objects as image maps a rectification has to be performed. The Pictran rectification modules do the reprojection of the images for planar and non-planar objects (orthophoto). The image map can be produced from a single image or multiple images. The projective distortion as well as the image errors are corrected.

9 Basic Modules Bundle Block Adjustment Exterior orientation and camera calibration Pictran-B determines all the initial values for the orientation parameters and coordinates of new points. Automated recognition and elimination of gross errors is supported. Additional observations (distances, coordinate differences, planes, projection centres,...) can be introduced as observations. Statistical analysis of the results are presented in detail. Fast and robust algorithms

10 Basic Modules 3d Digitizing 3d-measurement module The measurement is supported by epipolar lines. Accuracy information is always available. Graphical objects are overlaid on the images as vectors and can be used for visual ckecking. It is possible to select a plane in object space where the object points are distributed (single image method).

11 Architectural Photogrammetry Standard facade project: Measurements and CAD-mapping

12 Architectural Photogrammetry (Heritage Recording) Combined facade mapping with rectified thermography images Project: Ingenieurbüro Wüsteney, Esslingen - Software: Pictran

13 Architectural Photogrammetry (Heritage Recording) Thermography images to show the in-wall truss Infrared camera: Inframetrix 600 Temperature resolution: Kelvin Project: Ingenieurbüro Wüsteney, Esslingen - Software: Pictran

14 Architectural Photogrammetry (Heritage Recording) Detail mapping of the astronomic watch Project: Ingenieurbüro Wüsteney, Esslingen - Software: Pictran

15 Photogrammetry for Design Studies Wrapping of the Rheinfalls Rock (c) Büro für Leichtbau, Tritthardt + Ayerle, Radolfzell (c) Büro für Leichtbau, Tritthardt + Ayerle, Radolfzell

16 Photogrammetry for Design Studies Animation of the wrapped rock (c) Büro für Leichtbau, Tritthardt + Ayerle, Radolfzell

17 Photogrammetry for Design Studies Control points were fixed with the aid of professional climbers. 3d measurements were done in a safe place by photogrammetrist. Only the required measurements were performed.

18 New Developments What is the basis for new developments? New developments must have a commercial benefit for software industry and their customers. Customers need systems to solve their problems economically. Software must be... easy to use robust (algorithms and user interfaces) highly automated fast able to generate accurate and traceable results problem-oriented

19 New Developments What are we doing in the moment? Integration of coded targets Upgrading bundle block adjustment (simulation mode, alternative calculation mode, automatic elimination of errors) Implementation of problem-oriented software tools Integration of specialized editors for data analysis Improvements at customers option

20 New Developments Integration of Coded Targets Customers are able to create and print their own coded targets

21 New Developments Upgrading Bundle Adjustment The calculation of the exterior orientation parameters is still a problem for non-specialists. 2 calculation methods: The compact method (old) calculates good results for 95 % of the applications. The advanced method (new) is an alternative way. Control points are not used for the calculation of the initial values. So control point errors and image point errors can be detected in seperated calculation steps. 1 planning mode (new): This mode calculates data for the bundle block adjustment. (Input: digital surface model, camera definition, camera position and direction)

22 New Developments Camera Calibration Example: Calibration with coded targets PROJECT DATA OBSERVATIONS (OB) UNKNOWNS (UN) 5063 NU. CONSTR. EQUATIONS (CON) 12 REDUNDANCY (OB-UN+CON) 9863 SUM OF REDUNDANCY NUMBERS NU. OF DIAGONAL SUBMATRICES 5821 NU. OF ALL SUBMATRICES NU. OF ALL SINGLE ELEMENTS FILLING OF ATPA [%] E+00 Time for image point measurements: 25 sec/image Calculation time for bundle adjustment: 30 sec Computer: Pentium IV, 1800 MhZ

23 New Developments - Automated Rectification Example for an problem-oriented application Reasons for the development: Users are non-specialists. The software tool must be easy to use. Users can t generate a global control point system at the object. The dimension of the objects is large. More than one images are necessary. Short object occupation time is important.

24 New Developments - Automated Rectification Workflow: The local control point and tie points has to be marked. Customers should use control point frames. Additional observations (distances) are possible. Take the photographs. Perform the image measurements. Start the automated rectification tool. Result: One image map

25 New Developments - Automated Rectification User interface and control point frame

26 New Developments - Automated Rectification Traffic accident reconstruction without global coordinate system

27 New Developments - Automated Rectification Traffic accident reconstruction without global coordinate system Results: The method is capable of reducing time exposure and costs The achieved accuracy is sufficient to perform traffic accident reconstruction

28 New Developments - Automated Rectification Test: Building 3d spaces with plane base elements for tiling problems?

29 New Developments PictranMed An orthodontic application of digital photogrammetry The interior and exterior orientations are calculated without any intervention from an operator The pre-processing enables non-specialists to do the measurements. The measurements are provided by wizards

30 New Developments PictranMed Digitizing of 3d points within Pictran During export the points can be transformed to a standard coordinate system which is defined by 4 prominent points at the ears and below the eyes.

31 New Developments Data Presentation New editors for... the preparation and analysis of input data the statistical analysis of results

32 New Developments Data Presentation Preparing the input data... Fixities Enslavements

33 New Developments Data Presentation Grafical tools for monitoring the results Precision and reliability analysis Error Ellipsoids Stress in control points...

34 Wishes and Goals for the future The number of commercial close range photogrammetry users must increase! No camera calibration is needed. Higher sensor resolution for higher metric accuracy (cameras ) No known geometry on the objects is needed. No targets on the objects are needed. Automated determination of image point correspondences is possible. Automated measurement of free form shaped surfaces is possible. Automatic mapping of complex structures is possible. All these things must be integrated in an economical system

35 The End thank you for your attention!

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