Tag: video

Computer Vision: Image Resolution and Contrast

Apr 28, 2025

in Computer Vision, Theory

In this video we talk about image resolution and contrast. We’ll discuss the impact of diffraction, of our lenses and of our sensor. On the way we’ll cover diffraction and MTF charts.
Computer Vision: Camera Calibration with OpenCV [Video]

Apr 3, 2025

in Applied, Computer Vision

This video is about calibrating your camera with OpenCV. We’ll talk about which calibration targets are available, how to get them, how to take good pictures of them, how to run the calibration and how to evaluate it.
Computer Vision: The Camera Matrix [Video]

Mar 20, 2025

in Computer Vision, Theory

In this video we start with the pinhole camera model and derive the intrinsic and extrinsic camera matrices. On the way we also talk about homogeneous coordinates and rotations.
Exploring Silk Production in Vietnam [Video]

Jan 29, 2025

in Documentaries

I recently came across a Silk Factory in Dalat and a Silk Village in Hoi An. This got me very interested in silk production so in this video we first look at silk production in general and then we try to understand how a machine that’s used for reeling silk works. This is my first…
Automating 3D Reconstructions: First Milestone [Video]

Jan 17, 2025

in 3D Reconstruction, Projects

After a lot of work I’ve finally got a working prototype for automating 3d-reconstructions with photogrammetry. Obviously the hardware is not built professionally but by me, and I’m more of a theory/software person. So I’m not using an industrial computer vision camera but a camera for photographers (X-T2), the parts for moving the camera are…
Creating Vignetting and Distortion Corrections for Photographers [Video]

Dec 26, 2024

in Photography

In this video we create vignetting and distortion correction profiles for use in the lensfun database (and therefore in open-source photo-editing software like Darktable and RawTherapee). We talk about both theory and about practical aspects of doing the corrections. We evaluate the overall quality of our corrections and we compare our corrections to those already…
An Introduction to Focus Stacking [Video]

Dec 19, 2024

in Photography

In this video we’ll use two programs of the Hugin suite to do some simple focus stacking. First we’ll talk about some basics that are useful to know and in the end I briefly describe how I deal with focus stacking in my 3d-scanning machine. This video is intended for photographers rather than for computer…
Here’s how the Docker Group is Insecure [Video]

Sep 28, 2024

in Linux

This is a brief video about using Docker. It’s very common to add your user to the docker group so you don’t have to run a container as root. However, this is quite insecure and in this video I’ll show you why.
3D-Reconstruction: Building a small, simple Turntable [Video]

Sep 1, 2024

in 3D Reconstruction, Projects

In this video we’re building a small and simple turntable that we can use to take photos of an object in regular intervals. By combining the turntable with gphoto2 most of the process happens automatically. This is the second post in a series about 3D Reconstructions. The first post gave an overview of what we’re…
3D Reconstruction: Intro and Image Acquisition [Video]

Aug 22, 2024

in 3D Reconstruction, Projects

This is the first video of a series about 3D Reconstructions. We’ll use the open-source Photogrammetry program Meshroom and a home-built machine to take pictures of an object in regular intervals. Over the entire series we’ll look at and test which factors affect the quality of our reconstruction. I’ve found 3D reconstructions fascinating for a…