Each week I receive and respond to at least 2-3 emails and 3-4 blog post comments regarding NoneType errors in OpenCV and Python. For beginners, these errors can be hard to diagnose — by definition they aren’t very informative. Since…

Updated: September 16th, 2019 Ever since I wrote the first PyImageSearch tutorial on installing OpenCV + Python on the Raspberry Pi B+ back in February 2015 it has been my dream to offer a downloadable, pre-configured Raspbian .img file with OpenCV…

I’m going to start today’s blog post by asking a series of questions which will then be addressed later in the tutorial: What are image convolutions? What do they do? Why do we use them? How do we apply them?…

The PyImageSearch blog has grown a lot since I published that first post back in January 2014. It’s been an incredible journey and I have you, the reader, to thank for all the support over the past 2.5 years. However,…

I said it in last week’s blog post and I’ll say it again here today — I am not, by any stretch of the imagination, a GUI developer. I think my aversion to GUI development started back in early-High school…

I’ll be honest with you. I’m not much of a GUI developer. Never was one, never will be. I enjoy creating the occasional user interface with HTML + CSS, or hacking up a WordPress plugin to make it more aesthetically…

Here’s a common question I get asked on the PyImageSearch blog: How do I make a Python + OpenCV script start as soon as my system boots up? There are many ways to accomplish. By my favorite is to use…

Last week we learned a bit about Python virtual environments and how to access the RPi.GPIO and GPIO Zero libraries along with OpenCV. Today we are going to build on that knowledge and create an “alarm” that triggers both an…

I can’t believe this is the first time I am writing a blog post on GPIO and the Raspberry Pi. It’s a pretty big mistake on my part. I should have written this post much earlier. You see, on average,…