September 2008
Beginner to intermediate
580 pages
20h 7m
English
Content preview from Learning OpenCVBecome 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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Exercises
Load an image with interesting textures. Smooth the image in several ways using
cvSmooth()withsmoothtype=CV_GAUSSIAN.Use a symmetric 3-by-3, 5-by-5, 9-by-9 and 11-by-11 smoothing window size and display the results.
Are the output results nearly the same by smoothing the image twice with a 5-by-5 Gaussian filter as when you smooth once with two 11-by-11 filters? Why or why not?
Display the filter, creating a 100-by-100 single-channel image. Clear it and set the center pixel equal to 255.
Smooth this image with a 5-by-5 Gaussian filter and display the results. What did you find?
Do this again but now with a 9-by-9 Gaussian filter.
What does it look like if you start over and smooth the image twice with the 5-by-5 filter? Compare this with the 9-by-9 results. Are they nearly the same? Why or why not?
Load an interesting image. Again, blur it with
cvSmooth()using a Gaussian filter.Set
param1=param2=9. Try several settings ofparam3(e.g., 1, 4, and 6). Display the results.This time, set
param1=param2=0before settingparam3to 1, 4, and 6. Display the results. Are they different? Why?Again use
param1=param2=0but now setparam3=1andparam4=9. Smooth the picture and display the results.Repeat part c but with
param3=9andparam4=1. Display the results.Now smooth the image once with the settings of part c and once with the settings of part d. Display the results.
Compare the results in part e with smoothings that use
param3=param4=9andparam3=param4=0(i.e., a 9-by-9 filter). ...
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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.