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Re: Optical Inertia

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Hi,

Francois LE COAT writes:
> A WEB page was made to illustrate Monocular Depth...
> 
> <https://hebergement.universite-paris-saclay.fr/lecoat/demoweb/monocular_depth.html> 
> 
> 
> A drone flies between the trees of a forest. Thanks to the optical-flow
> measured on successive images, the monocular depth reveals the
> forest of trees... We take a reference image, the optical-flow is
> measured on two rectified images. Then we change the reference when
> the inter-correlation drops below 60%. We can perceive the relief in
> depth with a single camera, over time.
> 
> In fact, when we watch images captured by a drone, although there is
> only one camera, we often see the relief. This is particularly marked
> for trees in a forest. The goal here is to evaluate this relief, with
> a measurement of "optical-flow", which allows one image to be matched
> with another, when they seem to be close (we say they are "correlated").
> 
> We have two eyes, and the methods for measuring visible relief by
> stereoscopy are very developed. Since the beginning of photography,
> there were devices like the “stereoscope” which allows you to see the
> relief with two pictures, naturally. It is possible to measure relief,
> thanks to epipolar geometry, and well-known mathematics. There are many
> measurement methods, very effective and based on human vision.
> 
> When it comes to measuring relief with a single camera, knowledge is
> less established. There are 3D cameras, called "RGBD" with a "D" for
> "depth". But how do they work? Is it possible to improve those? What
> we are showing here does not require the use of any “artificial neural
> network”. It is a physical measurement, with a classic algorithm,
> which does not come from A.I. nor a big computer :-)
> 
> This is about measuring monocular depth, just as stereoscopic disparity
> is measured. It means quantifying the depth, with images from a single
> camera. We can see this relief naturally, but it is a matter of
> measuring it with the optical-flow.

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...

Best regards,

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

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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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