Topic 2: Structure from Motion
A. From images to 3D models: Photogrammetry and Structure from Motion concepts
Outline:
- principles of photogrammetry
- UAS low range flight and consumer camera image acquisition
- lateral and forward overlap, stereoscopic coverage
- principles of Structure from Motion
- 3D reconstruction from multiple overlapping imagery
Lecture:
- Lecture Slides
- Lecture recordings - parts 1, 2, 3, 4
- Lecture Slides 2016, learn about history of aerial mapping
- ISPRS 2016 paper on Reconstruction of Palmyra from tourist photos
- ISPRS 2016 paper on Reconstruction of popular monuments from crowdsourced photos
- Open Heritage - 3D models of iconic locations
Assignment 2A
Perform an experiment to investigate impact of the number and orientation of photos, light, as well as shape and features of a photographed object on its 3D reconstruction from multiple overlapping imagery.- Lab Experiment: 3D reconstruction from multiple overlapping imagery
Homework:
Prepare short report on your 3D modeling experiment.3D models from previous courses are available on OsgeoLab Skechfab account. If you would like your model to be added to the collectionl please indicate at the end of your report
"I agree for my 3D model to be uploaded to the OsgeoLab Skechfab collection and I want(/don't want) my name to be listed as an author in the model description"
and submit on through moodle your 3D model (preferably in the .obj format with accompaning .mtl and .jpg files, or check other formats supported by Sketchfab)
B. Imagery processing and structure from motion (SfM)
Outline:
- aerial imagery distortions
- orthorectification process
- interior and exterior orientation
- Bundle Block Adjustment
- Ground control points
- image mosaic and point cloud results
- structure from motion
Lecture:
- Lecture Slides
- Lecture recordings - parts 1, 2, 3, 4
Supplemental materials:
- Y. Furukawa and C. Hernández . Multi-View Stereo: A Tutorial. Foundations and TrendsR in Computer Graphics and Vision, vol. 9, no. 1-2, pp. 1–148, 2013.