Computational Imaging Photogrammetry

Brandi Daw Miles Tokunow

Alex Zakharchenko

Friday, December 6, 13

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

RTI-Reflectance Transformation ImagingPhotogrammetry

Friday, December 6, 13

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)

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Traditional Usages of Photogrammetry

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Georgia O’Keeffe Museum

“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

Conservation is a profession devoted to the preservation of tangible cultural heritage for the future.

Conservation Department, Dale Kronkright Chief Conservator

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Georgia O’Keeffe Museum Conservation

• Goal

Overarching Goal: Using computational imaging to monitor changes in objects over time.

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Refining the Photogrammetric Workflow

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Stage 2: Two Cameras + Tungsten Lights

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Stage 3: Three Cameras + Flash/LED/Tungsten

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Agisoft-Photoscan

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Successful results for a textured & patterned object

Flash-less heat and more reliable light quality

LED-less hot/more even light /easier set up

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Tungsten lights for monochromatic objects resulted in the best models.

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Computational Processing + PythonPhotogrammetric files can be exported as:x,y,z/RGB and normal levels

Results: depended on computational GPU used

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Future Studies + Direction of PhotogrammetryMore computational comparisons between data setsCollaboration with computer scientists to determine importance of numerical differencesPrint 3d models for more user accessibility (patrons of the museum with physical impairments)

Gaming Asset

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

Museum Interactive

Friday, December 6, 13