Test Structure From Motion Underwater

Latest update July 22, 2015 Started on June 18, 2015
sea
Structure from motion is a method of creating a 3D model by combining multiple still images. Our goal is to learn how to apply this technology to make underwater maps. This technology is already being used extensively with aerial drones. Because much of the ocean is not thoroughly mapped, structure from motion has the potential to change the way we view the ocean.

June 18, 2015
Expedition's summary cannot exceed 240 characters


Tags: 

Did you know that the National Geographic Society is currently offering Explorers a variety of funding opportunities in the fields of conservation, education, research, storytelling, and technology? To learn more and apply for a grant click here.
If you're not interested in applying for a grant, click continue below
Preparation

On Tuesday July 14th, we took an ROV to a sunken sailboat in Lake Tahoe. I made multiple transects over the boat, and a GoPro mounted downwards took photos twice a second. The photos produced a rough 3D model, but a second trip will probably be required to fill in the gaps. Here is one of the approximately 10,000 photos taken by the GoPro during the dive.

image-1

10,000 photos in two transects?? Whoa.

This is awesome!

Great to see you progressing with SfM, hope you learned a few lessons at a guess 10,000 images may be a few too many interest to hear how long it took to process that many

We got to lake Merritt, walked up to the shore and deployed. 2080 Immediately found a California Sea Hare (Sea Slug). We got some great footage with the GoPro and Vincent held depth while I got lunch....

image-1

Hi Thomas
Have you considered using the GoPro in the time lapse mode rather than video footage

Even HD footage is only 1920 by 1080 (basically 2MP) whist the Hero for time lapse collects data at a frame every 0.5 seconds (at either 5MP for the Hero or 16MP for the Hero 4 Black)

I have had great results from time lapse stills http://bit.ly/1Fm2ElX but never managed to get anything decent from frames taken from video

Either way wishing you success

Scott

@NSWwrecks What a great tip! We will have to experiment with the time lapse option next time. Thanks also for attaching the structure from motion guide - very useful!

Expedition Background

Today we are going to attempt to map a portion of Lake Merritt. We will take video of the lakebed with a downward facing GoPro. To turn the video into a 3D model, individual frames will be post-processed in VisualSFM and Meshlab. I have already experimented with creating a model from video. The image below shows a model of the ground created from video recorded with my phone. I used GOM Player's Burst Capture to get a sequence of frames, and I then followed an Open Source Photogrammetry tutorial to turn the images into a 3D model.

image-1

So cool! Can't wait to see the footage from the lake! :)

Very interesting!!!

Contribute to this expedition

Name
Email Address
Contribution
Currency
Number card
Expiration
CVC
Postal Code

Review Your Contribution

You have chosen to contribute to expedition.

Confirm your details:

  • Name:

  • Email:

  • Last 4 digits:

Click below to proceed.

Thank You for Your Contribution!

Fundraising Details:

Submit/Modify

Goal
Currency
Deadline
Tell us how raising these funds will impact your expedition
You're almost there, we just need to know three more things:
Is any part or component of your project funded by the National Geographic Society or a National Geographic Society Grant?
Is anyone on your expedition/project team affiliated, either currently or in the past, with the National Geographic Society?
Did you apply for a grant/funding from the National Geographic Society for this project?
You have a goal to raise by for:
How will raising these funds impact your expedition?
Is any part or component of your project funded by the National Geographic Society or a National Geographic Society Grant?
You’ve responded:
Is anyone on your expedition/project team affiliated, either currently or in the past, with the National Geographic Society?
You’ve responded:
Did you apply for a grant/funding from the National Geographic Society for this project?
You’ve responded:
Note:

Thank You

Fundraising is almost live!
Thank you for applying to collect contributions! We will review your request and follow up with next steps via email.
Feel free to email us if you have any questions. openexplorer@natgeo.com