mapillary / mapillary/OpenSfM

Handle flat scenes

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enhancement
Dominant language
Python
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Description

There should be a reconstruction initialization for scenes that are flat. Right now, flat scenes get no reconstruction because the homography test discards all possible starting pairs.

For flat scenes, there should be reconstruction bootstrapper that uses the plane homography and not the 5 point algo to compute the initial two-view reconstruction.

See here https://github.com/OpenDroneMap/OpenDroneMap/issues/228 for an example of flat scene that fails to build.

Contributor guide

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First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by tracing reconstruction initialization and the homography test that rejects all starting pairs for flat scenes. Compare the existing 5-point bootstrap path with the requested plane-homography path, using the linked OpenDroneMap example as a failure case. Done means flat scenes obtain an initial two-view reconstruction without relying on the 5-point algorithm.

Written by the indexing model from the issue text.

Assessment

Tech stack
opencv, python
Domain
computer-vision
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
25/100

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