Real-world scale estimation using agisoft software

[pjdeemac]

Hi!

Is there a way for Agisoft Metashape or Meshroom to automatically recognize the real-world scale of a scene,
based only on geometric information in the images - without placing any reference object (like a ruler or marker)?

In other words: can metashape infer actual size from visual clues alone, or is a known dimension always required?

Can I do so importing camera parameters as focal length and sensor width?

Thanks!

[OBNRacerMan]

Conventional photogrammetry is not calibrated against any standard, as is the case with 3D scanners, for this reason it is simply impossible to calculate the scale of the received content to any denominator, except for using known data on the sizes of some details in the image (that is why coded marks with known distances between them are used). P.S. I have a Revopoint Miraco Plus 3D scanner, it comes with coded rulers and markers for scanning large objects with high accuracy, combining photogrammetry and "pure" 3D scanning modes.

[Micr0]

Hi!

Is there a way for Agisoft Metashape or Meshroom to automatically recognize the real-world scale of a scene,
based only on geometric information in the images - without placing any reference object (like a ruler or marker)?

In other words: can metashape infer actual size from visual clues alone, or is a known dimension always required?

Can I do so importing camera parameters as focal length and sensor width?

Thanks!

A while back, I worked with a software engineer who was creating an AI based app that could that could map the three dimensional depths in a scan to a gray scale image that was read by a panto graph type machine. It seems an ai could probably Be used to recognize known objects in a 3D scan, and use their dimensions as a reference for the rest of the scan. That, however, is way above my pay grade..