After our previous post on computing image colorfulness was published, Stephan, a PyImageSearch reader, left a comment on the tutorial asking if there was a method to compute the colorfulness of specific regions of an image (rather than the entire…

Today’s blog post is inspired by a question I received from a PyImageSearch reader on Twitter, @makingyouthink. Paraphrasing the tweets myself and @makingyouthink exchanged, the question was: Have you ever seen a Python implementation of Measuring colourfulness in natural images…

This is the final post in our three part series on shape detection and analysis. Previously, we learned how to: Compute the center of a contour Perform shape detection & identification Today we are going to perform both shape detection…

Last updated on July 9, 2021. So, here I am. Riding the Amtrak 158 train, coming home after a long business trip. It’s hot. The AC is barely working. A baby is screaming right next to me while the accompanying…

If you haven’t noticed, the term “feature vector” is used quite often in this blog. And while we’ve seen it a lot, I wanted to dedicate an entire post to defining what exactly a feature vector is. What is an…

Last Wednesday’s blog post reviewed the first step of building an image search engine: Defining Your Image Descriptor. We then examined the three aspects of an image that can be easily described: Color: Image descriptors that characterize the color of…

On Monday, I showed you how to build an awesome Lord of the Rings image search engine, from start to finish. It was a lot of fun and we learned a lot. We made use of OpenCV image descriptors. More…

It’s…it’s a histogram. – Dr. Grant Okay. So maybe that isn’t the exact quote. But I think Dr. Grant would have been equally thrilled had he known the power of color histograms. And more importantly, when the power goes out,…