HIGH RESOLUTION TEXTURED MODELS FOR ENGINEERING APPLICATIONS<br />Laboratory of Photogrammetry<br />National Technical Uni...
Introduction<br />Object of study: 	<br />		The monument of Zalongon<br />Problem identification: <br />	Creation of a hig...
Objectives<br />Presentation of the basic steps and considerations in photogrammetric texture modeling <br />Investigation...
The monument of Zalongon<br />Location: NW of Greece<br />Built: 1950’s<br />Designers: <br />PatroklosKarandinos and <br ...
Equipment and Software<br />Equipment<br />CYRAX 2500 Laser scanner<br />Two total stations: TOPOCON GPT7003i and PENTAX R...
Data Acquired<br />12 nodes established for the geodetic network<br />761points were measured<br />	148 points for the sur...
Conventional 2D products<br />
3D texture modeling workflow<br />Point cloud<br /> registration<br />3D transformation to Local Reference System<br />3D ...
Problems in the texturing process<br />Occlusions<br />Shadows <br />Non-orientable images<br />Streched areas<br />Gaps<b...
Example results<br />
Interaction with 3D textured models<br />Difficulty in the presentation and interaction with high polygonal textured model...
Digital restoration of the monument<br />ORIGINAL<br />RECONSTRUCTED<br />
Monument record material<br />
Photogrammetric processing<br />
Surface modeling<br />
Surface modeling<br />
Surface reconstruction<br />
Creation of a 1:5 scaled model<br />
Scanning and registration<br />
3D surface integration<br />
Final 3D model<br />
Final textured 3D model<br />
Conclusions<br />The production of high polygon textured 3D models is still a challenging process<br />The level of intera...
Thank you for your attention<br />
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High resolution textured models for engineering applications

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  • Blue 3D processingGreen Photogrammetric processingPurple Texture mapping
  • Part of the textured surface in Image Master
  • Weather … damages on the surface of the MonumentReconstruction achieved by the combination of a variety of methods
  • Record material used to guide and evaluate the reconstruction process
  • Detailed photogrammetric data acquisition so as to better describe the problematic areas. Part of the original point cloud blended with the photogrammetrically acquired details
  • Construction of patch layout so as to form the basis and guide the reconstruction process. All contours are designed manually so as to closely follow the original surface and distinguish between healthy and broken areas
  • The second and most damaged “Head”
  • Results of the digital reconstruction for part of the surface of the second head so as to form a basis for the sculptor to work on
  • Cross sections calculated so as to form a basis for the sculptor to work on. The data was scaled by 1:5 and a plaster model was created for the sculptor to complete.
  • The completed plaster model was scanned with a resolution of ~1mm. The acquired data of both heads were registered, scaled and integrated with the original surfaces.
  • After the registration process, the results were analyzed so as to evaluate the alignment and most of the new data were found to be within 1cm of the original surface (green area) In yellow the deviations are up to 2cm and in the red areas the deviations are more than 2cm
  • the final result was produced by rewrapping the areas of the new data. View of the final completed surface model.
  • the final result was produced by rewrapping the areas of the new data. View of the final completed surface model.
  • High resolution textured models for engineering applications

    1. 1. HIGH RESOLUTION TEXTURED MODELS FOR ENGINEERING APPLICATIONS<br />Laboratory of Photogrammetry<br />National Technical University of Athens<br />Greece<br />
    2. 2. Introduction<br />Object of study: <br /> The monument of Zalongon<br />Problem identification: <br /> Creation of a high resolution textured 3D model of the monument and assistance in the restoration of the destroyed parts <br />
    3. 3. Objectives<br />Presentation of the basic steps and considerations in photogrammetric texture modeling <br />Investigation of the usability of 3D textured models in engineering applications in general<br />Interaction with the 3D model in order to assist the restoration process<br />
    4. 4. The monument of Zalongon<br />Location: NW of Greece<br />Built: 1950’s<br />Designers: <br />PatroklosKarandinos and <br /> George Zongolopoulos<br />Length: 17.5m<br />Height: 12.5m<br />
    5. 5. Equipment and Software<br />Equipment<br />CYRAX 2500 Laser scanner<br />Two total stations: TOPOCON GPT7003i and PENTAX R323NX<br />A 10MP digital camera: CANON MARK II<br />Software<br />Geodetic Adjustment: Tachimetria<br />CAD: AutoCAD, Rhinoceros<br />Photogrammetric: Image Master, Image Station<br />3D data processing: Geomagic, Cyclone, XYZRGB, GSI<br />Image processing: Photoshop<br />Scripting: Matlab<br />
    6. 6. Data Acquired<br />12 nodes established for the geodetic network<br />761points were measured<br /> 148 points for the survey of the surrounding area<br /> 327 control points <br /> 144 points of detail and <br /> 99 points for a horizontal section near the basis <br />16 scans <br /> 9 scanner setups <br /> 16 reflective targets <br />239photographs<br />
    7. 7. Conventional 2D products<br />
    8. 8. 3D texture modeling workflow<br />Point cloud<br /> registration<br />3D transformation to Local Reference System<br />3D Surfacing<br />Correction of the polygonal model<br />3D Model<br />Camera Calibration<br />Bundle Adjustment<br />Image Orientation<br />Texture Mapping<br />GCPs and TP<br />measurement<br />Texture Blending<br />VRML editing<br />Final 3D Model<br />
    9. 9. Problems in the texturing process<br />Occlusions<br />Shadows <br />Non-orientable images<br />Streched areas<br />Gaps<br />Interoperability issues<br />
    10. 10. Example results<br />
    11. 11. Interaction with 3D textured models<br />Difficulty in the presentation and interaction with high polygonal textured models<br />Most freeware provide little or no functionality that enables interaction<br />High polygonal models are efficiently handled only by commercial software<br />Most engineering applications are facilitated mainly by CAD or CAD-like information whereby color is difficult to retain<br />
    12. 12. Digital restoration of the monument<br />ORIGINAL<br />RECONSTRUCTED<br />
    13. 13. Monument record material<br />
    14. 14. Photogrammetric processing<br />
    15. 15. Surface modeling<br />
    16. 16. Surface modeling<br />
    17. 17. Surface reconstruction<br />
    18. 18. Creation of a 1:5 scaled model<br />
    19. 19. Scanning and registration<br />
    20. 20. 3D surface integration<br />
    21. 21. Final 3D model<br />
    22. 22. Final textured 3D model<br />
    23. 23. Conclusions<br />The production of high polygon textured 3D models is still a challenging process<br />The level of interaction with high-poly textured models through freeware is quite low<br />Engineering applications require CAD or CAD-like data whereby it is still difficult to retain and take advantage of the color<br />
    24. 24. Thank you for your attention<br />

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