ilmf 2015 in denver
TRANSCRIPT
2/24/2015
Christoph Strecha (Founder & CEO Pix4D)
Focus on UAV/ Drone Mapping software
• Based on 10 years research in Computer Vision& Photogrammetry
• Started in 2011• 40 people
• Head quarter Lausanne (CH)
• Office in San Franciscohead: Antoine Martin
• Office in Shanghaihead: David Wang
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• Parrot’s Bebop
• 180 degree fisheye lens allows viewpoint change by software
• DJI Phantom 2 Vision(+)
• Wide angle fisheye lens
• GoPro
• Wide angle fisheye lens allows capturing in action scene conditions
Increasing sensor size allows wide angle fisheye lenses at good resolution!
Perspective 50mm
Perspective 28mm
Fisheye 8mm
Fisheye Pro:• Better localization• Less images to model
complex scenes• Wide range in which the
image is sharp
Fisheye Contra:• Less and highly non-
uniform resolution (GSD)
•Goal: •Map of the interior and
exterior
•Complex 3D structure
•Semantic /simplified model difficult, but possible
•What is the relation between cost (time) of data acquisition and processing and accuracy of the model
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Tachimetric network
Laser scan result
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Automatically detected tie points
Result of the bundle block adjustment
Automated processing of about 1-5h depending on the image/ dataset size
Aquisition time for 3 laser scans is 2-3h
•Evaluation of perspective and fisheye lenses at distance of 10-15m
•Similar accuracy (perspective – 160 degree fisheye)
•Closer distance might be necessary (Indoor, Manhattan world scenario)
•Much higher flexibility with fisheye cameras
Andoid /IOS app• Created flight plan• Communicate with
drone to execute flight plan and capture images
Desktop or Cloud• Process imagery• Measure voluems• 3D points cloud• Ortho mosaic / DSM/
DTM
images + GPS
images + GPS
Flightplan
