Generating a point cloud from a crowdsourced photographic survey
Transcript of Generating a point cloud from a crowdsourced photographic survey
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Ruben JOYE - [email protected] Lecturer University College Ghent (Faculty School of Arts)
THURSDAY, 31 MAY 2012 - 16U00 - TEACHING DIGITAL PLANNING METHODS
Generating a point cloud from a crowdsourced photographic survey
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INTRODUCTION
L:N Landscape forum (source: le-notre.org)
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INTRODUCTION
Antalya (Turkey) (source: lonelyplanet.com)
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INTRODUCTION
Sillyon / Sillyum (source: Google Maps)
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INTRODUCTION
Sillyon / Sillyum (source: Google Maps)
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INTRODUCTION
[A] Lower gate [B] Ramp [C] Bastions [D] Tower[E] Late Building [F] Hellenistic building[G] Building with Pamphylian inscription [H] Cistern[J] Theatre[K] Odeum [L] Upper Gate[M] Houses[N] Temple [01] Unidentified Building[02] Temple[P] Stadium[Q] Palace [R] Necropolis[S] Waterworks [T] Round Tower
PLAN OF Sillyum (SOURCE: Bean G.E.)
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INTRODUCTION
Sillyum seen from Asar Koyu (photo: Bean G.E.)
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INTRODUCTION
Water source near lower gate (photo: Argyraspid)
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INTRODUCTION
Theatre (photo: Argyraspid)
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INTRODUCTION
3d scanned farm house (image: djaweb) (PHOTO: LEICA)
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INTRODUCTION
test with a local chapel
URL: http://photosynth.net/view.aspx?cid=515b5e37-9d99-4395-afcf-93295c425056
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INTRODUCTION
URL: http://photosynth.net/view.aspx?cid=515b5e37-9d99-4395-afcf-93295c425056
test with a local chapel
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INTRODUCTION
Exported pointcloud edited in Autocad
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INTRODUCTION
Le:Notre heritage group on the Sillyum site
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PHOTOGRAPHIC SURVEY
ATTENTION POINTS:
• provide enough overlap between photos
• panorama first• don’t crop pictures• shoot wide angle pictures• limit the angle between
photos• move around the object• shoot scenes with lots of
detail and texture
(source: photosynth blog)
visual reference (image: Photosynth blog)
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SITE 1: tower
FOTO 2:reutelbeekPHOTO 099
:
TOWER
FOTO 3:
Roeselarestraat
PhOTO 239TOWER
Photo 359
tower
PHOTOGRAPHIC SURVEY
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PHOTOGRAPHIC SURVEY
SITE 2: palace area
PHOTO 290
PALACEPHOTO 059
PALACE
FOTO 3:Roeselarestraat
PhOTO 341PALACE
PHOTO 589PALACe
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GENERATING THE POINT CLOUD USING PHOTOSYNTH
The easy to use interface of Photosynth
PHOTOSYNTH:
• download from photosynth.net
• requires Silverlight NET• requires a free Windows
Live account• reliable and fast broadband
connection is needed• reduce resolution size of
photos prior to process & upload
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GENERATING THE POINT CLOUD USING PHOTOSYNTH
the tower in the Photosynth browser
URL: http://photosynth.net/view.aspx?cid=0c14a64b-d223-4bb0-9c35-89a9b5c55e45
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GENERATING THE POINT CLOUD USING PHOTOSYNTH
the PALACE area in THE Photosynth browser
URL: http://photosynth.net/view.aspx?cid=188b2b00-eebc-4e01-86b1-1842cecd17bd
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GENERATING THE POINT CLOUD USING PHOTOSYNTH
Presentation (Photo: Ida Fasching)
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further analysis using Autocad
User interface of the browseps-plugin
BROWSEPS:
• free AutoCAD Plugin• requires NET Framework 3.5
SP1• command ‘browseps’• stores a *.pcg file locally
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further analysis using Autocad
User interface of SynthExport tool
BROWSEPS:
• free export tool• requires NET Framework 3.5
SP1• support for *.obj, *.ply, *vrml,
and *.x3d
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further analysis using Autocad
POINT CLOUD of the tower Classified by height
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further analysis using Autocad
POINT CLOUD of the tower Classified by height
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further analysis using Autocad
POINT CLOUD of the tower Classified by height
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further analysis using Autocad
orthogonal view of the tower & topography
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further analysis using Autocad
orthogonal view of both sides of the tower
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further analysis using Autocad
POINT CLOUD of the palace Classified by height
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further analysis using Autocad
TWO SECTIONS DERIVED FROM THE POINTCLOUD
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CONCLUSIONS
PRO:
• doesn’t require expensive or heavy equipment
• easy to use• fast results
CON:
• far less accurate and detailed then a 3D laser scanner
• difficulties with repetitive patterns and complex occlusions
• Linux and Mac OS are unsupported
• Needs (fast) internet connection
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Ruben JOYE - [email protected] University College Ghent (Faculty School of Arts)