CS 1114:
Introduction to Computing
Using MATLAB and Robotics
Prof. Noah Snavely
CS1114
http://cs1114.cs.cornell.edu
Robots: 2029
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Robots: 2012
Sony AIBO iRobot Create Wowwee Rovio
Robots: cute but dumb
What do they know about the world
around them?
– Without your help, very little
– Can’t even notice a bright red lightstick
Your mission: make them smarter
Lots of interesting math and computer
science, some computer programming
– Lots of experience with programming, even
with robots, won’t give you a leg up in 1114
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Overview
What is CS 1114?
– An honors-level intro to CS using
camera-controlled robots (Sony
Aibo, Wowwee Rovio)
– An alternative to CS1112 or
CS1132, to fulfill your Matlab
computing requirement
– Formerly known as CS100R
Goals of CS1114
Give you an intuition about computational
problem solving
Teach you useful (and interesting)
computer science
Give you fluency in the Matlab
programming environment
Have fun with robots
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Requirements
Exposure to programming (in any
language)
Some interest in math
– Computer science is about much more than
programming, and so is this course
Staff
Noah Snavely – Instructor (me)
Consultants:
– Rocky Li (frl8)
– Gautam Kamath (gck43)
– Andrew Rzesnik (ajr234)
– Ian Purnell (iap9)
– Jason Boada (jwb292)
– Markus Burkardt (mb833)
– Madeline Burton (mrb248)
– Margaret Scheiner (ms948)
– Stephanie Lee (snl27)
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Many options for intro
computing courses
CS1110, CS1113 – Java
CS1112, CS1114 – Matlab
CS111X AND CS113X
Beginning Fall 2007: every engineering student
takes CS111X (4 credits) and CS113X (1 credit)
CS1112 or CS1114 (this course). Then CS1130.
Matlab, then Java
or
CS1110 or CS1113. Then CS1132.
Java, then Matlab.
CS2110 prerequisite: CS1110 or CS1130.
Java or Matlab?
Both CS1110 and CS111[24]
teach fundamental problem
solving skills and computer
science techniques
The destination is the same…
… but the vehicle is different
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Questions?
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CS1114 Logistics
Lectures: Tue Thu 11:15–12:05, UPS 211
Sections:
– Wed 1:25 - 2:15, Upson 317
– Wed 2:30 - 3:20, Upson 317
– Wed 3:35 - 4:25, Upson 317
– Please go to same section for the entire course
Sections will be led by Rocky, Gautam, and
others
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CS1114 Logistics
CS1114 lab: Upson 317
You will soon have access to the lab and
passwords for the computers
Office hours will generally be held in the
lab (see staff page for hours)
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Course webpage
http://cs1114.cs.cornell.edu/
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Piazza
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About me
Noah Snavely
http://www.cs.cornell.edu/~snavely/
Research
– Computer vision
– Computer graphics
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Research focus
3D reconstruction from unorganized image
collections
Flickr photos (“Colosseum”) Automatic 3D reconstruction
Microsoft Photosynth
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What can we do with computer
science and computer vision?
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Robotics
NASA’s Mars Spirit Rover
http://en.wikipedia.org/wiki/Spirit_rover
Sports
Sportvision first down line
Nice explanation on www.howstuffworks.com
Source: S. Seitz
Face detection
• Many new digital cameras now detect faces
– Canon, Sony, Fuji, …
Source: S. Seitz
• What’s wrong with this picture?
Face recognition
Who is she? Source: S. Seitz
Vision-based biometrics
“How the Afghan Girl was Identified by Her Iris Patterns” Read the story
Source: S. Seitz
Medical imaging
Image guided surgery
3D imaging
Grimson et al., MIT
MRI, CT
Source: S. Seitz
User interfaces
Human vision
Source: “80 million tiny images” by Torralba, et al.
Question: How many people are in this image?
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Interpreting images
Q: Can a computer (or robot) understand this image?
A: Yes and no (mostly no)
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Major CS1114 Projects
From a camera, figure out the position of
a bright red lightstick
– Use this to guide a robot around
What we see What the robot sees
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Assignments
Approximately one mini-quiz every two
weeks
– In class, usually at start of Thursday lecture
• Corollary: be on time, or write fast…
5-6 robot programming assignments with
multiple parts
– You will demo each part to the lab TA’s
3 exams, probably in-class
Free-form final project (required)
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Major CS1114 Projects
Robot security guard
– Detect and track moving objects
Object recognition – find the right DVD in
your collection
Do Something Cool (final project)
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Grading
Programming assignments (10-20%)
In-class quizzes (15-25%)
Exams (50-60%)
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Questions?
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Getting started with Matlab
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Interpreting images
(300, 100)
Q: Can a computer (or robot) find the lightstick?
A: With your help, yes!*
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What is an image?
“lightstick1.jpg”
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What is an image?
A grid of numbers (intensity values)
x
y
…
…
snoop
Intensity values range between
0 (black) and 255 (white)
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What is an image?
A grid of numbers (intensity values)
In Matlab, a matrix
220
{
{
[ 10 30 40 106 123 … ;
8 49 58 112 145 … ;
300 16 53 86 123 152 … ;
… ]
300 x 220 matrix
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Matrices in Matlab
1D matrix is often called a vector
– Similar to arrays in other languages
A = [ 10 30 40 106 123 ] B = [ 10 ;
30 ; Column
Row vector vector
40 ;
(or 1 x 5 matrix) (or 5x1
106 ;
123 ] matrix)
A(1) == 10
A(4) == 106
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Matrices in Matlab
C = [ 10 30 40 106 123 ;
8 49 58 112 145 ;
16 53 86 123 152 ]
3 x 5 matrix
C(1,1) == 10
?
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C(2,4) == ?
can also assign to a matrix entries
C(1,1) = C(1,1) + 1
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For next time
Visit the course website
http://cs1114.cs.cornell.edu
Read the Matlab tutorial
Attend section in the lab tomorrow
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