3D Object Digitalization Project: Digital Langweil s model of Prague. Visual Connection, a.s

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Lynne Stafford
8 years ago
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1 3D Object Digitalization

2 Langweil s model of Prague This realistic, paper model of Prague, named after its creator, shows more than two thousand buildings in the city's historic centre in detail, and covers an area of some 20 m 2. In its size, technical mastery and excellent artistic expression it is one of the most spell-binding works ever made by human hand. Realistic paper model of Prague More than 2000 buildings of historical Prague center First time presented to public in 1862 Model scale 1:480 One of the most detail urbanistic paper models in the world The model geometrically corresponds to real status of today s historical center 90% of model is made from the paper and wood Model surface 20 m 2 divided into 52 separate parts

Realistic paper model of Prague 1826-1837 More than 2000 buildings of historical Prague center First time presented to public in 1862 Model scale 1:480 One of the most detail

3 Langweil s model of Prague

4 Langweil s model of Prague

5 Langweil s model of Prague 3,5m ~ 1,6km 6m ~ 2,6km

6 Ing. Jan Buriánek,

7 Ing. Jan Buriánek,

8 Ing. Jan Buriánek,

9 Ing. Jan Buriánek,

10 Ing. Jan Buriánek,

11 Ing. Jan Buriánek,

12 Ing. Jan Buriánek,

13 Ing. Jan Buriánek,

14 Ing. Jan Buriánek,

15 Ing. Jan Buriánek,

17 Project objectives Main objectives of Digital Langweil s Model: Digital archive of physical model Exhaustive detailed map of the model ( GIS ) Availability to experts and scientists Today s and historical Prague comparison Many public applications of the model: Multimedia CD/DVD about the model Digital presentation of the model at exhibitions Interactive applications (games, )

Today s and historical Prague comparison Many public applications of the model: Multimedia

18 Project DLM Digital Langweil s Model of Prague (DLM): Public tender (2006) Project stages: Preparation / analysis Systematic capturing 3D model reconstruction Experts Application (GIS/GIS3D) Applications for public Public release of the project: Q4 / 2008

capturing 3D model reconstruction Experts Application

19 Models difficulties Why is digitalization process of the model extremely difficult? Extreme details in both geometry and textures ~ macro Internal resolution of textures is ~ 1200 DPI Langweil was miniaturist, i.e. 3x3 mm signs on the walls (house orientation signs) Small letters on cemetery stones Statues on the Charles bridge Lamps on the walls St. Vitus Cathedral Average height of a house ~ 6,5 cm Very narrow streets (~ 3 mm) Painted arcades Jan Buriánek, Visual Connection, a.s.

20 Models resolution 10 lpi ~ 300 DPI 20 lpi ~ 600 DPI 40 lpi ~ 1200 DPI Expected during Minimum needed Optimal 16x more project preparation data and processing then expected Jan Buriánek, Visual Connection, a.s.

21 Data acquisition process systematic capture Special capturing photo robot

22 Data acquisition process systematic capture Special measurement procedures 3D scanning - Just for very complex geometry of the Cathedral Laparoscopic camera - Narrow streets etc. Professional photo camera - Frontal views - Full-frame camera

23 Data acquisition process systematic capture Output data (first stage of the project): More than calibrated pictures - 16Mpix digital photos - 13-bit per RGB channel Calibration measurement - Color reference - Scale reference Full project data database and documentary More than 6TB data

24 3D model reconstruction

25 3D model reconstruction

26 3D model reconstruction

27 3D model reconstruction

28 3D model reconstruction 3D point-cloud Millions reference 3D points Prezentace průběžných výsledků projektu

29 3D model reconstruction 3D point-cloud Prezentace průběžných výsledků projektu

30 3D model reconstruction 3D point-cloud Prezentace průběžných výsledků projektu

31 3D model reconstruction 3D point-cloud Prezentace průběžných výsledků projektu

32 3D model reconstruction 3D point-cloud Prezentace průběžných výsledků projektu

33 3D model reconstruction - polygonal model Projekt: Digitalizace Langweilova modelu Prahy

34 3D model reconstruction textured model Projekt: Digitalizace Langweilova modelu Prahy

35 3D model reconstruction complex model Projekt: Digitalizace Langweilova modelu Prahy

36 3D model reconstruction - complex model Projekt: Digitalizace Langweilova modelu Prahy

37 3D model reconstruction special geometry Special data set St. Vitus Cathedral (LASER scan) The most complex object in the model. 3D LASER scanner measurement. More than 6 millions of points (3D point-cloud). More than 6 millions triangles.

38 3D model reconstruction special geometry Special data set St. Vitus Cathedral (LASER scan & texture extraction) Projekt: Digitalizace Langweilova modelu Prahy

39 3D model reconstruction special geometry Special data set Charles bridge (special technology for statues)

40 Selected statistic data 3D object statistics The model contains: roofs chimneys trees Polygonal model consists: >40 millions of 3D points >50 millions of 3D polygons roughly 1 TB of texture data

41 Project outputs Expert application / output Special computer application for experts High-end visualization workstations for 3D digital model Very special system for 2D and 3D model view Database access via GIS (3D) methodology Knowledge base of the model Virtual 3D measurement tool Comparison: today s and historical Prague

42 Project outputs Expert application user interface Prezentace průběžných výsledků projektu

43 Project outputs Computer applications for public DVD Video about the project ( Making of ) Internet pages about the project (including some videos etc.) 3D model presentation CD (DVD) Virtual tours around 3D Langweil s model of Prague Technology: VRML97 Interactive 3D presentation on CD/DVD Škola hrou / Edutainment interactive game Quiz, adventure game, Public launch of the project: Q4/2008!

44 Project outputs Simplified model for public applications Prezentace průběžných výsledků projektu

45 Project outputs Ukázka z aplikace pro veřejnost Prezentace průběžných výsledků projektu

46 Project outputs Interactive game application sample Prezentace průběžných výsledků projektu

47 General notes for 3D projects General issues of 3D digitalization Extreme limitations during data acquisition process Very difficult budget planning (especially time planning) No standard for making 3D digital model. Various output forms required. The most stable digital medium has 30 years guarantee, no more

48 Thank you for attention! Visual Connection, a.s. Slezská 113/ Praha 3 Contact: Jan.Burianek@Visual.cz

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