July 2015
Intermediate to advanced
174 pages
3h 45m
English
Content preview from OpenCV Computer Vision with Java
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Integral images
Some face recognition algorithms, such as OpenCV's face detection algorithm make heavy use of features like the ones shown in the following image:
These are the so-called Haar-like features and they are calculated as the sum of pixels in the white area minus the sum of pixels in the black area. You might find this type of a feature kind of odd, but when training it for face detection, it can be built to be an extremely powerful classifier using only two of these features, as depicted in the following image:
In fact, a classifier that ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.