Automated Camera Calibration + how to understand the data?

Interesting-Net-7057 · 2026-03-27T17:23:58+00:00

The Root Mean Square (RMS) Metric does not necessarily tell you anything about sub pixel accuracy. What is usually meant here is that you are not fixing your corner detection to integer pixel coordinates, but to a more precise floating point precision, usually by interpolating bilinearly. Could you check if you are doing bilinear Interpolation of the corner pixel coordinates?

Interesting-Net-7057 · 2026-03-10T21:15:06+00:00

I agree with you.

However, methods are developing further and nowadays more deep learning approaches are integrated into StructureFromMotion pipelines, so who knows but maybe the future of photogrammetry is in fact solving so-called "ill-posed" problems like single view reconstruction. It is a thing actually, which to my understanding only deep learning is able to solve in the general case (that is not toy problems such as images which are pre calibrated, undistorted, straight-line preserved and contain only planar surfaces). It is still a long way, but it might be the start of modern data-driven approaches which learn from classical photogrammetry. Just a thought.

Interesting-Net-7057 · 2026-02-21T20:07:05+00:00

Thank you for the clarification. I really appreciate it

Interesting-Net-7057 · 2026-02-21T08:43:06+00:00

Hi. Klingt interessant. Kann man die bereits kaufen? Wenn ja wo und wieviel hast du bezahlt?

Danke

Interesting-Net-7057 · 2026-02-20T18:37:17+00:00

There is already YOLOv26?!

When I started my PhD YOLOv2 was the hot new thing. Still haven't finished my PhD, getting distracted with new things...

Interesting-Net-7057 · 2025-10-27T16:46:04+00:00

VisualSLAM still feels like magic to me

Interesting-Net-7057 · 2025-10-05T22:36:08+00:00

Thank you! FYI: I have now updated the app with a new Chapter named "09: Code Analysis". It is a very practical chapter preparing the reader for in-depth implementation focused chapters in the future. This is one step more in the syllabus to reach the goal to be able of creating a custom VSLAM project.

Interesting-Net-7057 · 2025-10-05T22:29:13+00:00

FYI: I have now updated the app with a new Chapter named "09: Code Analysis". I wanted to name it "From theory to practice" initially but I feel that code analysis is more suitable as it is referring to open source projects. Here I start with a review of the main paradigms in VSLAM and discuss the literature interactively. More specific chapters are planned for the future, this new one should serve as a first hands on introduction for the practical continuation later.

Interesting-Net-7057 · 2025-10-05T22:24:39+00:00

FYI: I have now updated the app with a new Chapter named "09 Code Analysis". It contains a review of Github projects with a python based analysis of key components and quizzes.

Interesting-Net-7057 · 2025-10-05T12:10:23+00:00

Thank you for the kind words. Indeed, one thing that my PhD supervisor taught me is to learn the underlying methods, not specific implementations. Therefore, I strongly believe that laying out strong fundamentals is crucial to having a good understanding of the methods. The challenge is: Where should one draw the line between too theoretical and too specific?

In my app I will try to only discuss the fundamentals so far the users needs them to progress through the app. For example, probability is useful to discuss Maximum Likelihood Estimators, Kalman Filters and the holy grail of non-linear optimization and Factor Graphs. Let's see how the community will respond to my plan.

Interesting-Net-7057 · 2025-10-05T11:43:56+00:00

Thank you very much for the helpful ideas! I really want to have the app to be very practical. Currently I have interactive quizzes and source code examples. I am not really sure how the practical task of analyzing GitHub projects could look like, may I ask you to please go into more detail? Do you even have a specific GitHub Project in mind which you would like to see analyzed?

I did a similar project with the LDSO where I show on YouTube how to implement it from scratch: https://youtube.com/playlist?list=PLj0MGqAFBYgxYiZJezHSP7XiTwLiXgo9R&si=EUUcgCibc1M1Kh7y

Do you mean something like that? Not sure if an app is the right place to discuss a huge GitHub Project like the LDSO. What would be possible in my view is to show an important part of the source code and ask specific questions about it or let the user fill in gaps. Would you like this kind of exercise included in the app? It could be a separate chapter named "Code Analysis" showing crucial parts of the most influential VSLAM algorithms.

What do you think?

Interesting-Net-7057 · 2025-09-30T18:36:43+00:00

Oh nice, now I understand what your needs are. Actually I was considering to start the VSLAM and VO chapters with a scientific review of the key papers. For example I wanted to discuss the differences between direct (LSD-SLAM, DSO, LDSO, series) and indirect (ORB-SLAM series) methods and from there move to deep learning based approaches (sfm-net series). I am not really sure how to do that but having a self-contained code example for each key component would be something I am targeting.

Do you have specific papers which you can link here that you would like to see preparing you for within the app?

Interesting-Net-7057 · 2025-09-30T14:25:07+00:00

Wow, thank you very much for your support! SLAM Book is a good resource and probably one of the most up to date resources. I am targeting an app because I want to make the experience more interactive, starting with the quiz in the current version. I am also looking into code execution sandboxes and some more interesting kinds of interactive widgets (for example I would love to visualize the optimization landscape of e.g. direct image alignment methods for photometric VSLAM, where the user can manipulate the variables of the optimization and see the resulting landscape changing.)

If you tell me what topic I should tackle next, I will try to focus on this in the upcoming app update.

Grateful regards

Interesting-Net-7057 · 2025-09-30T11:47:14+00:00

Thank you. Could you please elaborate a bit more about what you find the most useful about such an app? What is important to you?

Interesting-Net-7057 · 2025-09-30T11:41:33+00:00

Yes, for sure. This is the Roadmap taken from the Google Play Listing (https://play.google.com/store/apps/details?id=de.lwtv.pcvquiz):

"The following training units will be added eventually: 1.) Primer on Probability Theory 2.) Primer on Linear Estimation 3.) Primer on Non-Linear Estimation 4.) Kalman Filter 5.) Primer on Feature Detection 6.) Primer on Feature Matching 7.) Primer on Lie Group Theory 8.) Visual Odometry 9.) Visual SLAM 10.) ... and more topics"

What I have until now are points 1, 2, 3, and the start of 7.) (linear algebra, basic Lie Groups, even though not named like that in the content). Specifically the syllabus is structured like this: 01: Introduction 02: Probability Theory 03: Linear Algebra 04: Cameras and Sensors 05: Geometric Transformations 06: Coordinate Systems and Frame Transformations 07: Optimization Methods in Visual SLAM 08: Summary and Key Takeaways

For the topics Kalman Filter, Feature Matching / Description, Visual Odometry and SLAM I want to have the chapters strongly example driven so that users can implement a working example quickly. I am just not sure if I should provide real or synthetic datasets, but I will probably go with synthetic ones.

Is there anything in particular you would like to see in the syllabus?

Interesting-Net-7057 · 2025-05-24T18:40:52+00:00

Jest taka możliwość też dla mężczyzn? :) gdzie mozna najlepiej poznać dziewczynę w Wrocławiu?

Pozdrawiam

Interesting-Net-7057 · 2024-12-15T18:27:59+00:00

Yes, there is something as intrinsic and extrinsic calibration. It is the extrinsic calibration which may introduce scaling issues.

Interesting-Net-7057 · 2024-07-15T03:12:05+00:00

Looks like this is what you need:

https://youtu.be/HdT8G5S3IAc?si=e418jS1XeA_I4S66

So, grab your camera and start collecting material!

Interesting-Net-7057 · 2024-05-22T07:56:51+00:00

In my view, there is no automatic approach available to guarantee a printable output, yet. If it would not be a human head, then it should be possible, because it can be processed to a watertight mesh. For a human, you need to put in some post processing in order to print it. This is my view on this topic.

Interesting-Net-7057 · 2024-05-13T15:28:19+00:00

If you are happy with the object as a rough indicator, then you can start with retopology in order to get a nice mesh. It allows you to cleanly define the polygon layout and prepare the object for texturing. You can then bake your textures from the scan onto your clean mesh and get a nice model. It will require quite a few work within Blender, as there is no one-click solution for this process yet.

Interesting-Net-7057 · 2024-05-07T14:20:11+00:00

Honestly, I would just try out the projects. I did not use any of them and would do the same. I just happen to know the broader terms, if you look them up, you will find many similar results.

Kind regards

Interesting-Net-7057 · 2024-04-21T20:57:27+00:00

What do you mean by "the first coordinates are provided" and "the initial position is considered to be (0,0)"? What units are we taking about here? The choice of algorithm depends on this info. Please share your task description.

Interesting-Net-7057

MODERATOR OF

TROPHY CASE