What is Reddit's opinion of Multiple View Geometry in Computer Vision?

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There might be other options, but Multiple View Geometry in Computer Vision was a classic when I was a student.

There are some problem classes that are much more efficiently solved by classical (as in: without neural nets) CV. Even neural nets use linear algebra a lot, and although it's not exactly the same as for 2D/3D transformations you might want to get acquainted with the math behind all that.

I'd like to recomend several things, that greatly inspired me and made some order in my UAV-related photogrammetry understanding:

1. Small-format aerial photography and uas imagery (https://www.sciencedirect.com/book/9780128129425/small-format-aerial-photography-and-uas-imagery)
2. Manual of photogrammetry 4 ed (I've bought a paper book), the maths is almost the same along editions, so not need to pay much for very recent edition, if your concern is background science.
3. Handbook of Unmanned Aerial Vehicles (https://www.springer.com/gp/book/9789048197064)
4. Springer Handbook of Global Navigation Satellite Systems (https://www.springer.com/gp/book/9783319429267)
5. Multiple View Geometry in Computer Vision (https://www.amazon.com/Multiple-View-Geometry-Computer-Vision/dp/0521540518)
6. The Geometry of Multiple Images (https://www.amazon.com/Geometry-Multiple-Images-Formation-Applications/dp/0262562049)
7. Opensource SfM (structure from motion) and MVS (multiview stereo) packages such are COLMAP, OpenMVG, OpenMVS, Theia have all their github project pages with the links to publications for their ideas behind.
8. Since photogrammetry is lying above the absolute background of Least squares adjustment, it is good to recomend some books on topic: Observations and least squares by E. M. Mikhail and the google opensource excellent ceres-solver for doing this: http://ceres-solver.org/

Came at this from the opposite direction - needed to write projection calibration algorithms; this incredibly useful book supplied the linalg algorithms: https://www.amazon.co.uk/Multiple-Geometry-Computer-Vision-Second/dp/0521540518/

Yep, you've got it! Pick up Multiple View Geometry if you really want to get your hands dirty.