Re: Optical Inertia

From	Francois LE COAT <lecoat@atari.org>
Newsgroups	sci.image.processing
Subject	Re: Optical Inertia
Date	2025-06-18 15:15 +0200
Organization	To protect and to server
Message-ID	<102ue4n$3rvec$1@paganini.bofh.team> (permalink)
References	(5 earlier) <vhnjv5$3dv75$1@paganini.bofh.team> <vpi39q$3709u$1@paganini.bofh.team> <vsh6ul$1nos2$1@paganini.bofh.team> <1004ogh$2bjmt$1@paganini.bofh.team> <101cd4a$2hveo$1@paganini.bofh.team>

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Hi,

Francois LE COAT writes:
>>> Until now, drone images came from forests in France. The first images
>>> were obtained in the French Vosges.
>>>
>>> <https://www.youtube.com/watch?v=245yJJrwMQ0> Drone in the forest
>>>
>>> We are now seeing more and more drones in forests outside of France.
>>> The available image sources are diversifying...
>>
>> Here is a sequence of images of a ballad in the forest. This scene
>> is observed by a tracking drone...
>>
>>      <https://www.youtube.com/watch?v=46VWJ6-YqtY>
>>
>> The camera's movement is estimated in the images using a projective
>> dominant motion measurement. The presence of a man in the image sequence
>> does not interfere with trajectory estimation, because the character
>> occupies a position in the field of vision that is not dominant. The
>> dominant motion corresponds to the scrolling of the scenery, that is
>> the movement of the forest relative to an observing camera.
> 
> Here is a drone in the forest...
> 
> <https://www.youtube.com/watch?v=h3vhlRBB9tg> Forest
> 
> We also obtain the trajectory in space: <https://skfb.ly/pxGqL>
> 
> It's interesting to note that this trajectory loops. That is to say,
> the drone passes over the professional pilot's location, and is in
> the same place at the end of the video.
> 
> This proves the quality of the trajectory estimation in space. :-)

Here's a long drone flight through a Swedish forest...

<https://www.youtube.com/watch?v=ppW5BbDPFHc> Swedish forest

We obtain the estimated trajectory in space: <https://skfb.ly/pxZHy>

The image matching algorithm doesn't incorporate any prior knowledge
about what the camera is observing. This might look like a SLAM
(Simultaneous Localization And Mapping) method, which is a sparse
method, but what is presented is a global and dense method based
on optical-flow measurement (Dense Inverse Search - DIS).

This is an algorithm, i.e. a numerical recipe, that does not use
artificial neural networks. We obtain a filtered measurement (by
a Kalman filter) of physical data.

Best regards,

-- 
Dr. François LE COAT
CNRS - Paris - France
<https://hebergement.universite-paris-saclay.fr/lecoat>

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Thread

Optical Inertia Francois LE COAT <lecoat@atari.org> - 2024-02-28 14:45 +0100
  Re: Optical Inertia Francois LE COAT <lecoat@atari.org> - 2024-03-28 16:15 +0100
    Re: Optical Inertia Francois LE COAT <lecoat@atari.org> - 2024-04-03 18:45 +0200
      Re: Optical Inertia Francois LE COAT <lecoat@atari.org> - 2024-10-17 15:15 +0200
        Re: Optical Inertia Francois LE COAT <lecoat@atari.org> - 2024-10-29 19:00 +0100
          Re: Optical Inertia Francois LE COAT <lecoat@atari.org> - 2024-11-21 16:35 +0100
            Re: Optical Inertia Francois LE COAT <lecoat@atari.org> - 2025-02-24 16:30 +0100
              Re: Optical Inertia Francois LE COAT <lecoat@atari.org> - 2025-04-01 19:15 +0200
                Re: Optical Inertia Francois LE COAT <lecoat@atari.org> - 2025-05-15 15:00 +0200
                Re: Optical Inertia Francois LE COAT <lecoat@atari.org> - 2025-05-30 15:51 +0200
                Re: Optical Inertia Francois LE COAT <lecoat@atari.org> - 2025-06-18 15:15 +0200
                Re: Optical Inertia Francois LE COAT <lecoat@atari.org> - 2025-09-16 15:30 +0200
                Re: Optical Inertia Francois LE COAT <lecoat@archimedium.fr> - 2025-10-21 16:35 +0200
                Re: Optical Inertia Francois LE COAT <lecoat@archimedium.fr> - 2025-11-04 16:15 +0100
                Re: Optical Inertia Francois LE COAT <lecoat@archimedium.fr> - 2025-11-18 15:10 +0100
                Re: Optical Inertia Francois LE COAT <lecoat@archimedium.fr> - 2025-12-09 15:30 +0100
                Re: Optical Inertia Francois LE COAT <lecoat@archimedium.fr> - 2026-01-14 15:15 +0100
                Re: Optical Inertia Francois LE COAT <lecoat@archimedium.fr> - 2026-04-28 15:45 +0200

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