July 2011
Intermediate to advanced
648 pages
13h 2m
English
book
OpenCL Programming Guide
by Aaftab Munshi, Benedict R. Gaster, Timothy G. Mattson, James Fung, Dan Ginsburg
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Chapter 15. Sobel Edge Detection Filter
In this chapter, we use an OpenCL kernel to implement the Sobel edge detection filter as a simple example of how kernels work with images in OpenCL.
What Is a Sobel Edge Detection Filter?
The Sobel edge filter is a directional edge detector filter because it computes the image gradients along the x- and y-axes. These image gradients along the x- and y-axes (described as Gx and Gy) are computed by convolving the source image with the following convolution kernels:
The gradient magnitude is computed as
Implementing ...
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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.