An in-depth exploration of finding the center of rotation from 2x3 and 3x3 transformation matrices, with analytical solutions, Python code using SymPy, and an alternative approach involving eigenvectors. Covers the challenges faced, mathematical derivations, and practical applications in computer vision and image processing.

Introduction Starting with simple examples and moving towards more complex ones is a widely accepted teaching method. However, I consider this approach to be somewhat redundant for our purposes, a...

Introduction This article aims to organize and share observations from my collection of Logarex slide rules. There are two valuable resources in Czech on this topic, other than online auctions (au...

Explore logarithms, slide rules, and their fascinating history through this engaging math article. Learn how logarithms convert multiplication to addition.

Introduction This article builds on top of 2023-07-11-eng-self-hosting-recap and 2023-06-26-eng-podman-files. Not much have changed. I updated many articles such as NextCloud recovery and update....

Introduction I wanted to limit the number of lines written into journal to reduce disc writes and perhaps a bit of CPU usage. iotop command showed that journalctl is responsible for the majority o...

Explore the captivating world of nighttime photography with this in-depth guide on capturing noctilucent clouds timelapse. Explores the image processing pipeline with Python code and RawTherapee software to handle variable exposures when capturing this atmospheric phenomenon.

A comprehensive cheat sheet for image processing tasks on Linux, covering batch file processing, WebP conversion, PNG optimization, resizing, type conversion, video processing, and more. Includes examples and command-line instructions for tools like ImageMagick, FFmpeg, and GraphViz.

Building on our previous exploration of the Perseids meteor shower, this sequel delves deeper into the specifics of nighttime photography during this celestial event. Several questions arose from o...

For night photography enthusiasts, here’s a consolidated guide from my experience with the Perseids aplicable to nighttime photography in general. Captured three Perseids from 110 shots with a 10...

Harness the full potential of Visual Studio Code as a remote IDE for Linux development enabling you to code, debug, and manage your Linux projects from anywhere."

These are low quality random, personal notes about first things to do on Debian 12 Bookworm when installed on IceWhale ZimaBoard 216. It does not include installing CasaOS on top of that.

Pre-history (2017), Raspberry PI This blog idea somewhat started in 2017 when I wanted to document my experiments with Arduino and things that I’ve learned. I wrote about half of the articles I wa...

Guide to backup and disaster recovery for self-hosted services like Gitea and Nextcloud. Examples of data restoration and service recovery using Podman containers.

Discover a comprehensive guide to self-hosting Gitea, a lightweight DevOps platform for Git hosting. This article walks you through the installation, setup, and operation of Gitea using Docker Compose, including configuring user registration, securing remote HTTPS access with Cloudflare tunnels, and automating startup with systemd. Explore practical examples of creating new repositories, migrating existing ones, and implementing backup scripts for data recovery. Some sections are specific to Podman.