You're reading from Hands-On Vision and Behavior for Self-Driving Cars

Product typeBook

Published inOct 2020

PublisherPackt

ISBN-139781800203587

Edition1st Edition

Tools

OpenCV

Concepts

Computer Vision

Authors (2):

Luca Venturi

Krishtof Korda

View More author details

Pedestrian detection using HOG

The Histogram of Oriented Gradients (HOG) is an object detection technique implemented by OpenCV. In simple cases, it can be used to see whether there is a certain object present in the image, where it is, and how big it is.

OpenCV includes a detector trained for pedestrians, and you are going to use it. It might not be enough for a real-life situation, but it is useful to learn how to use it. You could also train another one with more images to see whether it performs better. Later in the book, you will see how to use deep learning to detect not only pedestrians but also cars and traffic lights.

Sliding window

The HOG pedestrian detector in OpenCV is trained with a model that is 48x96 pixels, and therefore it is not able to detect objects smaller than that (or, better, it could, but the box will be 48x96).

At the core of the HOG detector, there is a mechanism able to tell whether a given 48x96 image is a pedestrian. As this is not terribly...

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Authors (2)

Luca Venturi

Luca Venturi has extensive experience as a programmer with world-class companies, including Ferrari and Opera Software. He has also worked for some start-ups, including Activetainment (maker of the world's first smart bike), Futurehome (a provider of smart home solutions), and CompanyBook (whose offerings apply artificial intelligence to sales). He worked on the Data Platform team at Tapad (Telenor Group), making petabytes of data accessible to the rest of the company, and is now the lead engineer of Piano Software's analytical database.
Read more about Luca Venturi

Krishtof Korda

Krishtof Korda grew up in a mountainside home over which the US Navy's Blue Angels flew during the Reno Air Races each year. A graduate from the University of Southern California and the USMC Officer Candidate School, he set the Marine Corps obstacle course record of 51 seconds. He took his love of aviation to the USAF, flying aboard the C-5M Super Galaxy as a flight test engineer for 5 years, and engineered installations of airborne experiments for the USAF Test Pilot School for 4 years. Later, he transitioned to designing sensor integrations for autonomous cars at Lyft Level 5. Now he works as an applications engineer for Ouster, integrating LIDAR sensors in the fields of robotics, AVs, drones, and mining, and loves racing Enduro mountain bikes.
Read more about Krishtof Korda

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