Computational photography uses machine-readable representations of the visual world to synthesize visual experiences. Photogrammetry is the science of making measurements from photographs and can be used for close-range or aerial applications. The Georgia O'Keeffe Museum is using computational imaging and photogrammetry to create 3D models of artworks to monitor changes over time for conservation purposes. The museum refined its photogrammetry workflow using different camera and lighting configurations. Software like Agisoft Photoscan is used to process the images into 3D models. Future work includes more computational comparisons of datasets and printing 3D models for accessibility.

1. Computational Imaging
Photogrammetry
Brandi Daw
Miles Tokunow
Alex Zakharchenko
Friday, December 6, 13

2. What is Computational Photography?
“Computational Photography captures a machine-readable representation of our world to
synthesize the essence of our visual experience”. -Ramesh Raskar & Jack Tumblin, MIT
Photogrammetry
Friday, December 6, 13
RTI-Reflectance Transformation Imaging

3. Photogrammetry
is the science of making
measurements from photographs
(Greek: phot (light) + gramma
(something drawn) + metrein
(measure)
Close range (non-traditional)
ground based, <300 meters)
Aerial Photogrammetry
(traditional)
Friday, December 6, 13

4. Traditional Usages of Photogrammetry
Friday, December 6, 13

5. Georgia O’Keeffe Museum
Conservation Department, Dale Kronkright Chief Conservator
Conservation is a profession devoted
to the preservation of tangible
cultural heritage for the future.
“In conservation and preservation, computational imaging uses the power of
today’s laptop microprocessors and digital cameras to create accurate,
archival, 3-D images and documentation for artistic and cultural objects”.
-O’Keeffe Imaging Project Blog Post
Friday, December 6, 13

6. Georgia O’Keeffe Museum Conservation
•
Goal
Overarching Goal:
Using computational
imaging to monitor
changes in objects
over time.
Friday, December 6, 13

7. Refining the Photogrammetric Workflow
Friday, December 6, 13

8. Stage 2: Two Cameras + Tungsten Lights
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9. Stage 3: Three Cameras + Flash/LED/Tungsten
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10. Agisoft-Photoscan
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15. Successful results
for a textured &
patterned object
Flash-less heat and
more reliable light
quality
LED-less hot/more
even light /easier set
up
Friday, December 6, 13

16. Tungsten lights
for
monochromatic
objects resulted
in the best
models.
Friday, December 6, 13

17. Computational Processing + Python
Photogrammetric files can be exported as:
x,y,z/RGB and normal levels
Results: depended on computational GPU used
Friday, December 6, 13

18. Future Studies + Direction of Photogrammetry
More computational comparisons between data sets
Collaboration with computer scientists to determine importance of
numerical differences
Print 3d models for more user accessibility (patrons of the museum
with physical impairments)
Gaming Asset
Friday, December 6, 13
Museum Interactive
Kaiba Gionfriddo became the
first person to have his life
saved by a 3-D printed device:
Doctors at the University of
Michigan's C.S. Mott Children's
Hospital designed a
customized splint that opened
his airways and saved his life