November 2018
Beginner
310 pages
7h 25m
English
book
Learn OpenCV 4 by Building Projects - Second Edition
by David Millán Escrivá, Vinícius G. Mendonça, Prateek Joshi
Content preview from Learn OpenCV 4 by Building Projects - Second Edition
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Extremal regions
Extremal regions are connected areas that are characterized by almost uniform intensity, which is surrounded by a contrasted background. The stability of a region can be measured by calculating how resistant to thresholding variance the region is. This variance can be measured with a simple algorithm:
- Apply the threshold, generating an image, A. Detect its connected pixels regions (extremal regions).
- Increase the threshold by a delta amount, generating an image, B. Detect its connected pixels regions (extremal regions).
- Compare image B with A. If a region in image A is similar to the same region in image B, add it to the same branch in the tree. The criteria of similarity may vary from implementation to implementation, but ...
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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.