July 2015
Intermediate to advanced
174 pages
3h 45m
English
Content preview from OpenCV Computer Vision with JavaBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Discrete Fourier Transform and Discrete Cosine Transform
When dealing with image analysis, it would be very useful if you could change an image from the spatial domain, which is the image in terms of its x and y coordinates, to the frequency domain—the image decomposed in its high and low frequency components—so that you would be able to see and manipulate frequency parameters. This could come in handy in image compression because it is known that human vision is not much sensitive to high frequency signals as it is to low frequency signals. In this way, you could transform an image from the spatial domain to the frequency domain and remove high frequency components, reducing the required memory to represent the image and hence compressing it. ...
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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.
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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.