In this tutorial you will learn how to install OpenCV 4 on the Raspberry Pi 4 and Raspbian Buster. You will learn how to install OpenCV 4 on Raspbian Buster via both: A simple pip-install method (which can be completed in a matter of minutes) Compiling from source (which will take longer but will give you […]
Multiprocessing with OpenCV and Python
By Adrian Rosebrock on September 9, 2019 in Image Descriptors, Image Search Engine Basics, Tutorials
In this tutorial, you will learn how to use multiprocessing with OpenCV and Python to perform feature extraction. You’ll learn how to use multiprocessing with OpenCV to parallelize feature extraction across the system bus, including all processors and cores on your computer. Today’s tutorial is inspired by PyImageSearch reader, Abigail. Abigail writes: Hey Adrian, I […]
OpenCV – Stream video to web browser/HTML page
In this tutorial you will learn how to use OpenCV to stream video from a webcam to a web browser/HTML page using Flask and Python. Ever have your car stolen? Mine was stolen over the weekend. And let me tell you, I’m pissed. I can’t share too many details as it’s an active criminal investigation, but […]
Building an Image Hashing Search Engine with VP-Trees and OpenCV
In this tutorial, you will learn how to build a scalable image hashing search engine using OpenCV, Python, and VP-Trees. Image hashing algorithms are used to: Uniquely quantify the contents of an image using only a single integer. Find duplicate or near-duplicate images in a dataset of images based on their computed hashes. Back in […]
Simple Scene Boundary/Shot Transition Detection with OpenCV
In this tutorial, you will learn how to implement a simple scene boundary/shot transition detector with OpenCV. Two weeks ago I flew out to San Diego, CA for a vacation with my Dad. We were on the first flight out of Philadelphia and landed in San Diego at 10:30 AM, but unfortunately, our hotel rooms […]
An interview with Kapil Varshney, Data Scientist at Esri R&D
In today’s blog post, I interview Kapil Varshney, a PyImageSearch reader who was recently hired at Esri Research and Development as a Data Scientist focusing on Computer Vision and Deep Learning. Kapil’s story is really important as it shows that, no matter what your background is, you can be successful in computer vision and deep learning — you just […]
Keras Learning Rate Finder
In this tutorial, you will learn how to automatically find learning rates using Keras. This guide provides a Keras implementation of fast.ai’s popular “lr_find” method. Today is part three in our three-part series of learning rate schedules, policies, and decay using Keras: Part #1: Keras learning rate schedules and decay Part #2: Cyclical Learning Rates […]
Cyclical Learning Rates with Keras and Deep Learning
In this tutorial, you will learn how to use Cyclical Learning Rates (CLR) and Keras to train your own neural networks. Using Cyclical Learning Rates you can dramatically reduce the number of experiments required to tune and find an optimal learning rate for your model. Today is part two in our three-part series on tuning […]
Keras learning rate schedules and decay
In this tutorial, you will learn about learning rate schedules and decay using Keras. You’ll learn how to use Keras’ standard learning rate decay along with step-based, linear, and polynomial learning rate schedules. When training a neural network, the learning rate is often the most important hyperparameter for you to tune: Too small a learning […]
Video classification with Keras and Deep Learning
In this tutorial, you will learn how to perform video classification using Keras, Python, and Deep Learning. Specifically, you will learn: The difference between video classification and standard image classification How to train a Convolutional Neural Network using Keras for image classification How to take that CNN and then use it for video classification How […]