March 2022

3 ways to detect slow queries in PostgreSQL
This blog post is about handling bad performance in PostgreSQL and shows three useful and quick methods to spot performance problems and slow queries.
haokaiyang/Mac-QuickLook: QuickLook plugins and packages
QuickLook plugins and packages. Contribute to haokaiyang/Mac-QuickLook development by creating an account on GitHub.

Sinatra Best Practices: Part One
While Sinatra’s one-file approach may work well for your one-off, smaller application – it can quickly become a mess as you add on multiple routes, route-handlers, helpers, and configuration.…

How I test Rails applications
When I was a Rails beginner I was amazed by Rails and Test Driven Development. But I often struggled with testing because I did not know…

Faster Rails: Eliminating N+1 queries - Semaphore
N+1 queries are making your Rails app painfully slow. Learn how to eliminate them from your project.

cv_bridge/Tutorials/ConvertingBetweenROSImagesAndOpenCVImagesPython - ROS Wiki
Standard way of pulling images off the camea and into opencv for ROS
OpenCV with ROS using Python
OpenCV with ROS using Python URL: https://dabit-industries.github.io/turtlebot2-tutorials/14b-OpenCV2_Python.html Type: link Domain: dabit-industries.github.io

YOLO object detection with OpenCV - PyImageSearc
In this guide you will learn how to use the YOLO object detector to detect objects in images and video using OpenCV, Python, and Deep Learning.

You Only Look Once: Unified, Real-Time Object Detection
We present YOLO, a new approach to object detection. Prior work on object
detection repurposes classifiers to perform detection. Instead, we frame object
detection as a regression problem to...

OpenCV: Hough Line Transform
OpenCV: Hough Line Transform URL: https://docs.opencv.org/4.x/d6/d10/tutorial_py_houghlines.html Type: link Domain: docs.opencv.org
OpenCV: Contours in OpenCV
OpenCV: Contours in OpenCV URL: https://docs.opencv.org/4.x/d3/d05/tutorial_py_table_of_contents_contours.html Type: link Domain: docs.opencv.org

OpenCV: Canny Edge Detection
OpenCV: Canny Edge Detection URL: https://docs.opencv.org/4.x/da/d22/tutorial_py_canny.html Type: link Domain: docs.opencv.org
OpenCV: OpenCV-Python Tutorials
OpenCV: OpenCV-Python Tutorials URL: https://docs.opencv.org/4.x/d6/d00/tutorial_py_root.html Type: link Domain: docs.opencv.org
GitHub - TomWright/dasel: Select, put and delete data from JSON, TOML, YAML, XML and CSV files with a single tool. Supports conversion between formats and can be used as a Go package.
Select, put and delete data from JSON, TOML, YAML, XML and CSV files with a single tool. Supports conversion between formats and can be used as a Go package. - GitHub - TomWright/dasel: Select, put...

LIDAR LD06
strongDatasheet: http://wiki.inno-maker.com/display/HOMEPAGE/LD06/strong

Lecture 3 2: Hector Mapping - Simultaneous Localization and Mapping
Lecture 3 2: Hector Mapping - Simultaneous Localization and Mapping URL: https://www.youtube.com/watch?v=Q4qM-Uzj1SI&t=34s Type: video Domain: youtube.com
how hector slam works - Google Search
how hector slam works - Google Search URL: https://www.google.com/search?client=safari&rls=en&q=how+hector+slam+works&ie=UTF-8&oe=UTF-8#kpvalbx=_0oQrYrHpL7qlptQPhryg2AE24 Type: link Domain: google.com

Compare Countries With This Simple Tool
Drag and drop countries around the map to compare their relative size. Is Greenland really as big as all of Africa? You may be surprised at what you find! A great tool for educators.