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Introduction to Computer Vision
by James Hays
Image by
kirkh.deviantart.com
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Categories of the SUN database
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What is Computer Vision?
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Computer Vision and Nearby Fields
• Computer Graphics: Models to Images
• Comp. Photography: Images to Images• Comp. Photography: Images to Images
• Computer Vision: Images to Models
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Computer Vision
Make computers understand images and
video.
What kind of scene?
Where are the cars?
How far is the How far is the building?
…
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Vision is really hard
• Vision is an amazing feat of natural
intelligenceintelligence
– Visual cortex occupies about 50% of Macaque brain
– More human brain devoted to vision than anything else
Is that a queen or a
bishop?bishop?
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Why computer vision matters
Safety Health Security
Comfort AccessFun
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Ridiculously brief history of computer vision
• 1966: Minsky assigns computer vision as an undergrad summer project
• 1960’s: interpretation of synthetic worldsworlds
• 1970’s: some progress on interpreting selected images
• 1980’s: ANNs come and go; shift toward geometry and increased mathematical rigor
• 1990’s: face recognition; statistical
Guzman ‘68
Ohta Kanade ‘78• 1990’s: face recognition; statistical analysis in vogue
• 2000’s: broader recognition; large annotated datasets available; video processing starts
Ohta Kanade ‘78
Turk and Pentland ‘91
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How vision is used now
• Examples of state-of-the-art
Some of the following slides by Steve Seitz
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Optical character recognition (OCR)
Technology to convert scanned docs to text• If you have a scanner, it probably came with OCR software
Digit recognition, AT&T labshttp://www.research.att.com/~yann/
License plate readershttp://en.wikipedia.org/wiki/Automatic_number_plate_recognition
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Face detection
• Many new digital cameras now detect faces
– Canon, Sony, Fuji, …
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Smile detection
Sony Cyber-shot® T70 Digital Still Camera
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3D from thousands of images
Building Rome in a Day: Agarwal et al. 2009
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Object recognition (in supermarkets)
LaneHawk by EvolutionRobotics“A smart camera is flush-mounted in the checkout lane, continuously watching for items. When an item is detected and recognized, the cashier verifies the quantity of items that were found under the basket, and continues to close the transaction. The item can remain under the basket, and with LaneHawk,you are assured to get paid for it… “
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Vision-based biometrics
“How the Afghan Girl was Identified by Her Iris Patterns” Read the story wikipedia
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Login without a password…
Fingerprint scanners on many new laptops,
other devices
Face recognition systems now beginning to appear more widely
http://www.sensiblevision.com/
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Object recognition (in mobile phones)
Point & Find, NokiaPoint & Find, Nokia
Google Goggles
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Special effects: shape capture
The Matrix movies, ESC Entertainment, XYZRGB, NRC
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Special effects: motion capture
Pirates of the Carribean, Industrial Light and Magic
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Scene Completion
[Hays and Efros. Scene Completion Using Millions of Photographs.
SIGGRAPH 2007 and CACM October 2008.]
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Nearest neighbor scenes from
database of 2.3 million photos
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Graph cut + Poisson blending
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Sports
Sportvision first down lineSportvision first down lineNice explanation on www.howstuffworks.com
http://www.sportvision.com/video.html
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Smart cars Slide content courtesy of Amnon Shashua
• Mobileye
– Vision systems currently in high-end BMW, GM,
Volvo models
– By 2010: 70% of car manufacturers.
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Google cars
http://www.nytimes.com/2010/10/10/science/10google.html?ref=artificialintelligence
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Vision-based interaction (and games)
Nintendo Wii has camera-based IR
Digimask: put your face on a 3D avatar.
Nintendo Wii has camera-based IRtracking built in. See Lee’s work atCMU on clever tricks on using it tocreate a multi-touch display!
“Game turns moviegoers into Human Joysticks”, CNETCamera tracking a crowd, based on this work.
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Interactive Games: Kinect
• Object Recognition:
http://www.youtube.com/watch?feature=iv&v=fQ59dXOo63o
• Mario: http://www.youtube.com/watch?v=8CTJL5lUjHg
3D: http://www.youtube.com/watch?v=7QrnwoO1-8A• 3D: http://www.youtube.com/watch?v=7QrnwoO1-8A
• Robot: http://www.youtube.com/watch?v=w8BmgtMKFbY
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Vision in space
Vision systems (JPL) used for several tasks
NASA'S Mars Exploration Rover Spirit captured this westward view from atop a low plateau where Spirit spent the closing months of 2007.
Vision systems (JPL) used for several tasks• Panorama stitching• 3D terrain modeling• Obstacle detection, position tracking• For more, read “Computer Vision on Mars” by Matthies et al.
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Industrial robots
Vision-guided robots position nut runners on wheels
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Mobile robots
http://www.robocup.org/NASA’s Mars Spirit Rover
http://en.wikipedia.org/wiki/Spirit_rover
Saxena et al. 2008STAIR at Stanford
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Medical imaging
Image guided surgeryGrimson et al., MIT
3D imagingMRI, CT
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Research Ideas
An Empirical Study of Context in Object Detection