June 2019
Intermediate to advanced
348 pages
8h 28m
English
Content preview from Qt 5 and OpenCV 4 Computer Vision Projects
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The no-entry traffic sign
In this example, we are going to train a cascade classifier that will be used to detect a traffic sign, namely, the no-entry sign:
The first thing to do is to prepare the negative samples—the background images. As we mentioned, the negative samples can be arbitrary images that don't contain the objects of interest, so we can collect some images for that purpose easily. When these images are collected, we put their paths in a text file. In that file, the paths are listed in one path per line format, and the path can be either absolute or relative.
We will use the phrases negative sample images and background images ...
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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.