March 2019
Intermediate to advanced
538 pages
13h 38m
English
book
Building Computer Vision Projects with OpenCV 4 and C++
by David Millan Escriva, Prateek Joshi, Vinicius G. Mendonca, Roy Shilkrot
Content preview from Building Computer Vision Projects with OpenCV 4 and C++
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Geometrical transformation
It is important that the faces are all aligned together, otherwise the face recognition algorithm might be comparing part of a nose with part of an eye, and so on. The output of the face detection we've just seen will give aligned faces to some extent, but it is not very accurate (that is, the face rectangle will not always be starting from the same point on the forehead).
To have better alignment, we will use eye detection to align the face, so the positions of the two detected eyes line up perfectly in the desired positions. We will do the geometrical transformation using the warpAffine() function, which is a single operation that will do the following four things:
- Rotate the face so that the two eyes are horizontal ...
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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.
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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.