March 2020
Intermediate to advanced
366 pages
9h 8m
English
book
OpenCV 4 with Python Blueprints - Second Edition
by Dr. Menua Gevorgyan, Michael Beyeler (USD), Arsen Mamikonyan, Michael Beyeler
Content preview from OpenCV 4 with Python Blueprints - Second Edition
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Learning about Fourier analysis
To find the visually salient subregions of an image, we need to look at its frequency spectrum. So far we have treated all our images and video frames in the spatial domain, that is, by analyzing the pixels or studying how the image intensity changes in different subregions of the image. However, the images can also be represented in the frequency domain, that is, by analyzing the pixel frequencies or studying how often and with what periodicity the pixels show up in the image.
An image can be transformed from the space domain into the frequency domain by applying the Fourier transform. In the frequency domain, we no longer think in terms of image coordinates (x,y). Instead, we aim to find the spectrum of an ...
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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.