Blog on alexsm@home http://alexsm.com/blog/ Recent content in Blog on alexsm@home Hugo en-us Sat, 21 Feb 2026 00:00:00 +0000 Autonomy Slider and LLM tools for software development http://alexsm.com/autonomy-slider/ Sat, 21 Feb 2026 00:00:00 +0000 http://alexsm.com/autonomy-slider/ The mental model of Autonomy Slider with examples of software development use cases with LLM-based tools Recognition of green apples using HSV color model and region-based image processing http://alexsm.com/green-objects-hsv-erosion-dilation-connected-components/ Sun, 26 Oct 2025 00:00:00 +0000 http://alexsm.com/green-objects-hsv-erosion-dilation-connected-components/ Demo of using OpenCV’s RGB-to-HSV, erosion, dilation, and connected components detection to identify green apples in an image Configure on-demand GitHub Copilot completions in VSCode http://alexsm.com/vscode-copilot-keybinding/ Fri, 15 Aug 2025 00:00:00 +0000 http://alexsm.com/vscode-copilot-keybinding/ Control when you want the completions by a keybinding OpenCV perspective warping: keystone effect and rotation around center http://alexsm.com/opencv-warping/ Sun, 08 Jun 2025 00:00:00 +0000 http://alexsm.com/opencv-warping/ Two examples of performing perspective transformations with OpenCV using getPerspectiveTransform and warpPerspective Install and configure pyenv on a Mac http://alexsm.com/install-and-configure-pyenv-on-mac/ Sun, 15 Dec 2024 00:00:00 +0000 http://alexsm.com/install-and-configure-pyenv-on-mac/ More controllable management of Python versions Run Caddy in Docker for serving a static site http://alexsm.com/caddy-docker-static-site/ Mon, 29 Jul 2024 00:00:00 +0000 http://alexsm.com/caddy-docker-static-site/ Simple command for serving a static web site, with automatic generation and renewal of HTTPS certificates Layered software architecture and dependencies http://alexsm.com/layered-architecture-and-dependencies/ Sun, 14 Apr 2024 00:00:00 +0000 http://alexsm.com/layered-architecture-and-dependencies/ Communication between software layers and looser coupling through dependency injection References as C++ class members http://alexsm.com/cpp-references-as-class-members/ Sat, 16 Mar 2024 00:00:00 +0000 http://alexsm.com/cpp-references-as-class-members/ Arguments on why and when it is a bad idea to have references as class members, and when it can be fine Graphviz setup on a Mac to be used with Python/Jupyter http://alexsm.com/graphviz-setup-mac-jupyter/ Sun, 04 Feb 2024 00:00:00 +0000 http://alexsm.com/graphviz-setup-mac-jupyter/ Brew-installed grapviz + pip-installed graphiz library (along with an overview of other related libraries) Finding perpendicular lines and vectors http://alexsm.com/finding-perpendicular-lines-and-vectors/ Sun, 31 Dec 2023 00:00:00 +0000 http://alexsm.com/finding-perpendicular-lines-and-vectors/ Examples of using linear algebra and Python/NumPy to find perpendicular lines/vectors and parallel lines at a certain distance Rotations and translations with Eigen and scipy.spatial http://alexsm.com/transformations-with-eigen-and-scipy-spatial/ Sun, 12 Nov 2023 00:00:00 +0000 http://alexsm.com/transformations-with-eigen-and-scipy-spatial/ Homogeneus transformations (rotation + translation), comparing Eigen (C++) and SciPy (Python); example with the roll-pitch-yaw (RPY) sequence of rotations Some example of std::ranges and std::views usage in C++20 http://alexsm.com/cpp-ranges-views-examples/ Sun, 09 Jul 2023 00:00:00 +0000 http://alexsm.com/cpp-ranges-views-examples/ Useful examples with ranges and views, allowing for more functional style of C++ code Beta distribution http://alexsm.com/beta-distribution/ Sun, 09 Apr 2023 00:00:00 +0000 http://alexsm.com/beta-distribution/ My notes on Beta probability distribution based on the “Bayesian Statistics the Fun Way” book Spin up a MySQL database powered by Docker http://alexsm.com/launch-mysql-on-docker/ Fri, 20 Jan 2023 00:00:00 +0000 http://alexsm.com/launch-mysql-on-docker/ Launch a MySQL database in Docker and communicate with it using Brew-installed mysql-client Update all outdated packages inside a virtualenv with pip http://alexsm.com/upgrade-outdated-packages-virtualenv-pip/ Fri, 25 Nov 2022 00:00:00 +0000 http://alexsm.com/upgrade-outdated-packages-virtualenv-pip/ Shell pipeline using pip, tail, awk, tr, xargs Reading a binary STL file with C++ http://alexsm.com/read-binary-stl-file-cpp/ Mon, 22 Aug 2022 00:00:00 +0000 http://alexsm.com/read-binary-stl-file-cpp/ Reading triangular mesh data from a binary STL file with C++; an example of using reinterpret_cast Homogeneous transformations: an example in 2D with Python http://alexsm.com/homogeneous-transforms/ Sat, 02 Jul 2022 00:00:00 +0000 http://alexsm.com/homogeneous-transforms/ 2D homogeneneous transformation (rotation + translation), with NumPy-based examples and visualizations of individual transformations and chains of consecutive transformations Configure NAT port forwarding on VMWare Fusion for SSH http://alexsm.com/vmware-fusion-nat-port-forwarding-ssh/ Sat, 16 Apr 2022 00:00:00 +0000 http://alexsm.com/vmware-fusion-nat-port-forwarding-ssh/ Setting up openssh-server and ufw on an Ubuntu virtual machine, and configuring NAT on VMWare Fusion Homogeneous vectors http://alexsm.com/homogeneous-vectors/ Sun, 10 Apr 2022 00:00:00 +0000 http://alexsm.com/homogeneous-vectors/ Using homogeneous vectors to represent points and lines, with NumPy-based examples Looking again at Go: go.mod, go.sum, go.work, and VSCode config http://alexsm.com/back-go-golang/ Sat, 02 Apr 2022 00:00:00 +0000 http://alexsm.com/back-go-golang/ Golang workspaces, modules, and some VSCode configurations Configuring SSH agent http://alexsm.com/configure-ssh-agent/ Sat, 19 Mar 2022 00:00:00 +0000 http://alexsm.com/configure-ssh-agent/ Using SSH agent across Mac and Linux, forwarding the agent in sessions Using git rebase --onto to attach a branch to an earlier commit http://alexsm.com/git-rebase-onto/ Sun, 20 Feb 2022 00:00:00 +0000 http://alexsm.com/git-rebase-onto/ Manipulating where the current branch starts with git rebase Different methods of search and insertion into std::map http://alexsm.com/cpp-map-lookup-and-insert/ Sat, 29 Jan 2022 00:00:00 +0000 http://alexsm.com/cpp-map-lookup-and-insert/ Different ways of lookup and insert into C++’s map Automatically split and join a video using ffmpeg http://alexsm.com/ffmpeg-split-and-join/ Sun, 28 Nov 2021 00:00:00 +0000 http://alexsm.com/ffmpeg-split-and-join/ Using ffmpeg, a custom shell script and a file with timestamp markings to automate cutting away undesirable parts of a video Using a condition variable in C++ http://alexsm.com/cpp-condition-variable/ Wed, 14 Jul 2021 00:00:00 +0000 http://alexsm.com/cpp-condition-variable/ A C++ example of using a conditional variable and a mutex std::vector and C++'s braced initialization http://alexsm.com/cpp-std-vector-braced-init/ Thu, 13 May 2021 00:00:00 +0000 http://alexsm.com/cpp-std-vector-braced-init/ When braced initialization is preferred and when it is not (when it comes to std::vector) Serve images on the fly in a binary form with Flask http://alexsm.com/flask-serve-images-on-the-fly/ Sat, 01 May 2021 00:00:00 +0000 http://alexsm.com/flask-serve-images-on-the-fly/ Using Flask and OpenCV to create and serve images on the fly (with the expected Content-Type) Searching for the closest value in a sorted vector with C++ http://alexsm.com/cpp-closest-lower-bound/ Sat, 24 Apr 2021 00:00:00 +0000 http://alexsm.com/cpp-closest-lower-bound/ Kind of like binary search, but for a std::vector of sorted floats, using std::lower_bound Building C++ code from command line on Windows http://alexsm.com/build-cpp-code-from-windows-terminal/ Sat, 17 Apr 2021 00:00:00 +0000 http://alexsm.com/build-cpp-code-from-windows-terminal/ Some notes on using Visual Studio’s cl.exe to build C++ code from a terminal on Windows Optimization with Python http://alexsm.com/optimization-with-python/ Sun, 11 Apr 2021 00:00:00 +0000 http://alexsm.com/optimization-with-python/ Resources on doing mathematical optimization with Python (SciPy and other tools) Applying a command to each line in a file with xargs -L1 http://alexsm.com/xargs-apply-to-each-line/ Mon, 05 Apr 2021 00:00:00 +0000 http://alexsm.com/xargs-apply-to-each-line/ An xargs example for doing an operation for each line printed by cat Position independent code http://alexsm.com/fpic-cmake-pybind11/ Tue, 05 May 2020 00:00:00 +0000 http://alexsm.com/fpic-cmake-pybind11/ Applying -fPIC flag when building with CMake C++ move semantics http://alexsm.com/cpp-move-semantics/ Tue, 17 Sep 2019 00:00:00 +0000 http://alexsm.com/cpp-move-semantics/ Some notes on C++ move semantics and an example of copy/move construction and assignment Cancelling bad stuff in Git http://alexsm.com/cancel-bad-stuff-in-git/ Sun, 23 Jun 2019 00:00:00 +0000 http://alexsm.com/cancel-bad-stuff-in-git/ Some Git command to recover from when something has been messed up Using rsync with an AWS EC2 instance and an SSH key http://alexsm.com/rsync-aws-ec2-ssh-pem/ Sun, 20 Jan 2019 00:00:00 +0000 http://alexsm.com/rsync-aws-ec2-ssh-pem/ Using rsync with EC2 and subtleties of the trailing slash My favorite IPython Magic commands http://alexsm.com/jupyter-notebook-ipython-magic/ Mon, 25 Jun 2018 00:00:00 +0000 http://alexsm.com/jupyter-notebook-ipython-magic/ matplotlib inline/notebook; autoreload; javascript/should_scroll, timeit Exposing C++ array data in Python with the Pybind11 buffer protocol http://alexsm.com/pybind11-buffer-protocol-opencv-to-numpy/ Sun, 24 Jun 2018 00:00:00 +0000 http://alexsm.com/pybind11-buffer-protocol-opencv-to-numpy/ Integrating your C++ code with Python/NumPy code Building OpenCV with Conda on Linux http://alexsm.com/building-opencv-with-conda/ Fri, 29 Dec 2017 00:00:00 +0000 http://alexsm.com/building-opencv-with-conda/ An OLD tutorial of how to build OpenCV for using it with a Conda environment Configuring jumbo frames in Ubuntu http://alexsm.com/configuring-jumbo-frames-in-ubuntu/ Sat, 28 Oct 2017 00:00:00 +0000 http://alexsm.com/configuring-jumbo-frames-in-ubuntu/ Allowing jumbo frames in Ubuntu’s /etc/network/interfaces to be able to use GigE Vision cameras Welcome http://alexsm.com/first-post/ Wed, 02 Aug 2017 00:00:00 +0000 http://alexsm.com/first-post/ Starting this blog