Intro to Computer Vision (for 4th Graders)

Part of an outreach initiative by the Moon Goons microgravity research team at UIUC

Transcript

1. Making a computer see
2.  Who’s this?
5. Each box has 1 color YOU see a color! COMPUTER sees a number! What are the primary colors?
8. Tells us how much red, green, and blue is in the pixel. MAXIMUM = 255 MINIMUM = 0 “Mix” the lights!
10. This is cool. Why? We can make cool things! Like what? A rainbow clock! http://ambushnetworks.com/clock/
11.  How do I make a computer find something?
12.  http://harthur.github.io/kittydar/ (2) Steps “Training” “Detection”
13.  Take lots of pictures of cats  Take lots of pictures of not cats
14.  Calculate a special thing called “histogram of oriented gradients” (it’s hard math)
15.  Give data to “neural network” (more hard math)  Run “backpropogation” (so much hard math)  Now your neural network can detect cats!
16.  Slide a window over the image  Keeping asking neural network “hey does this little picture look like a cat?”  A little slow.
17.  Is easier than detecting cats!  Why? Oil on our faces and symmetry (short answer)
18.  Single image face detection http://liuliu.me/ccv/js/nss/  Silly glasses via face detection http://youtu.be/YYES9Qd094o?t=1m20s  Eulerian Video Magnification http://youtu.be/ONZcjs1Pjmk?t=1m35s
19. Our quadrocopter has a camera! I teach it to see things and to know “I need to spin” or “I need to stop spinning” It’s a cool job! http://youtu.be/TbBM1Gpt390?t=9s
20.  If you want to have fun making stuff like this when you get older, STUDY MATH.  MATH IS FUN. It doesn’t seem that way sometimes, but it’s totally worth it in the end!  Computer vision can make fun games!  Computer vision can help people!
21. Questions?