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15-463 (15-862): Computational Photography
Computer Science Department
Carnegie Mellon University

INSTRUCTOR: Alexei (Alyosha) Efros (Office hours: Th 3:30-4:30pm, Smith 225)
TA:
Natasha Kholgade (Office hours: Tu 2-3pm)
UNIVERSITY UNITS: 12
SEMESTER: Fall 2011
WEB PAGE: http://graphics.cs.cmu.edu/courses/15-463/
LOCATION:
GHC 4301
TIME
: T R 12:00--1:20 PM

COURSE OVERVIEW:
Computational Photography is an emerging new field created by the convergence of computer graphics, computer vision and photography. Its role is to overcome the limitations of the traditional camera by using computational techniques to produce a richer, more vivid, perhaps more perceptually meaningful representation of our visual world.

The aim of this advanced undergraduate course is to study ways in which samples from the real world (images and video) can be used to generate compelling computer graphics imagery. We will learn how to acquire, represent, and render scenes from digitized photographs. Several popular image-based algorithms will be presented, with an emphasis on using these techniques to build practical systems. This hands-on emphasis will be reflected in the programming assignments, in which students will have the opportunity to acquire their own images of indoor and outdoor scenes and develop the image analysis and synthesis tools needed to render and view the scenes on the computer.

TOPICS TO BE COVERED:

  • Cameras, Image Formation
  • Visual Perception
  • Image and Video Processing (filtering, anti-aliasing, pyramids)
  • Image Manipulation (warping, morphing, mosaicing, matting, compositing)
  • Modeling and Synthesis using Lots of Data
  • High Dynamic Range Imaging and Tone Mapping
  • Image-Based Lighting
  • Image-Based Rendering
  • Non-photorealistic Rendering

PREREQUISITES:
Programming experience and familiarity with linear algebra and calculus is assumed. Some background in computer graphics, computer vision, or image processing is helpful. This class does not significantly overlap with 15-462 and can be taken concurrently.
Graduate Students: a small number of graduate students will be allowed to take the graduate version of this course (15-862) with the permission of the instructor. Students taking 15-862 will be required to do more substantial assignments as well as a research-level final paper.
Note: if the system doesn’t let you sign up, or puts you on the waitlist, do talk to me.

PROGRAMMING ASSIGNMENTS:

  Project 1: Images of the Russian Empire – colorizing the Prokudin-Gorskii photo collection

class results
Class Choice Award: Pinar Ozlen (ugrad), Hugh Cover (grad)

  Project 2: Image Resizing by Seam Carving (for undergrads)
 

  Project 2g: Gradient Domain Editing (for grad students)
 
class results
Class Choice Award: Ryan Oksenhorn (ugrad); Julia Schwartz (grad)

 Project 3: Face morphing and modeling:
http://www.cs.cmu.edu/afs/andrew/scs/cs/15-463/pub/www/images/image1.jpghttp://www.cs.cmu.edu/afs/andrew/scs/cs/15-463/pub/www/images/imagemc.jpghttp://www.cs.cmu.edu/afs/andrew/scs/cs/15-463/pub/www/images/image2.jpg
class results
Class Choice Award: Yiling Tay

 Project 4: Home-made Camera Obscura

class results
Class Choice Award: Max Hawkins

  Project 5: Stitching Photo Mosaics
http://www.cs.cmu.edu/afs/andrew/scs/cs/15-463/pub/www/images/panorama.jpg
class results

Class Choice Award: Sang Tian (ugrad), Chris Harrisson (grad)

 Final Projects!

class results


TEXT:
There is now a textbook that covers most (if not all) of the topics related to Computational Photography. This will be the primary reference for the course:

Computer Vision: Algorithms and Applications, Richard Szeliski, 2010

There is a number of other fine texts that you can use for general reference:

Photography (8th edition), London and Upton, (a great general guide to taking pictures)
Vision Science: Photons to Phenomenology, Stephen Palmer (great book on human visual perception)
Computer Vision: The Modern Approach, Forsyth and Ponce
Digital Image Processing, 2nd edition, Gonzalez and Woods (a good general image processing text)
The Art and Science of Digital Compositing, Ron Brinkmann (everything about compositing)
Multiple View Geometry in Computer Vision, Hartley & Zisserman (a bible on recovering 3D geometry) [on reserve]
The Computer Image, Watt and Policarpo (a nice “vision for graphics” text, somewhat dated)
3D Computer Graphics (3rd Edition), Watt (a good general graphics text)
Fundamentals of Computer Graphics, Peter Shirley (another good general graphics text)
Linear Algebra and its Applications, Gilbert Strang (a truly wonderful book on linear algebra)

CLASS NOTES
The instructor is extremely grateful to a large number of researchers for making their slides available for use in this course. Steve Seitz and Rick Szeliski have been particularly kind in letting me use their wonderful lecture notes. In addition, I would like to thank Paul Debevec, Stephen Palmer, Paul Heckbert, David Forsyth, Steve Marschner and others, as noted in the slides. The instructor gladly gives permission to use and modify any of the slides for academic and research purposes. However, please do also acknowledge the original sources where appropriate.

CLASS SCHEDULE:

CLASS DATE

TOPICS

Material

Tu Aug 30

Introduction

Th Sept 1

Capturing Light… in man and machine

 

Tu Spet 6

Sampling and Reconstruction
alias

  • Slides (ppt pdf)
  • start Szeliski Ch 3

 

Th Spet 8

Template Matching and Pyramids

  • continue slides (ppt pdf)
  • continue Szeliski Ch 3

 

Tu Sept 13

The Frequency Domain

  • Slides (ppt, pdf)
  • continue Szeliski Ch 3

Th Sept 15

Filtering

  • Continue slides (ppt, pdf)
  • continue Szeliski Ch 3

Tu Sept 20

Image Blending and Compositing

Slides (ppt, pdf)

continue Szeliski Ch.3 + Sec 9.3.4

Additional Reading:
Burt and
 Adelson, Amultiresolution spline with application to image mosaics, ACM ToG (1983) 
McCann & Pollard, Real-Time Gradient-Domain Painting, SIGGRAPH 2008
Agarwala et al, Interactive Digital Photomontage, SIGGRAPH 2004

Th Sept 22

Point Processing and Image Warping
   
 rotated

Slides (ppt, pdf)

Slides (ppt, pdf)

continue Szeliski Ch 3

Tu Sept 27

Image Morphing
catwoman

Slides (ppt, pdf)

continue Szeliski Ch 3

Th Sept 29

Data-driven Methods: Faces
BlanzFig3

Slides (ppt, pdf)
 
 Rowland and Ferrett, “Manipulating Facial Appearance through Shape and Color”, CG&A, 1995

  Additional Reading:

  1. Blanz and Vetter, “A Morphable Model for the Synthesis of 3D Faces”, SIGGRAPH 1999
  2. Cootes, Edwards, and Taylor“Active Appearance Models”,  ECCV 1998

Tu Oct 4

Data-driven Methods: Video and Texture

 

 

 

 

Th Oct 6

Data-driven Methods: Features, Histograms, and Image Comparisons

 

Tu Oct 11

Data-driven Methods: Internet-sized Data

Reading: Hays & Efros, Scene Completion Using Millions of Photographs

Additional Reading:
1.
  im2gps
2. 
 Creating and Exploring a Large Photorealistic Virtual Space

3. ShadowDraw

 

Th Oct 13

The Camera
 

  • Slides (ppt, pdf)
  • Szeliski Ch. 2

Th Oct 20

Modeling Light

Slides (ppt, pdf)

Tu Oct 25

What makes a Great Picture? 
 vs.
 

Slides (ppt, pdf)
Reading:
 Y. Ke, X. Tang, and F. Jing. The Design of High-Level Features for Photo Quality Assessment.  CVPR 2006.

Th Oct 27

Homographies and Mosaics

  • Slides (ppt, pdf)
  • Szeliski Ch 9

 

Tu Nov 1

More Mosaic Madness

       Slides (ppt, pdf)

       Additional Reading: Rick Szeliski, Image Alignment and Stitching, A Tutorial (DRAFT)

Th Nov 3

Automatic Alignment

Tu Nov 8

Midterm Review

Th Nov 10

Midterm

 

Tu Nov 15

Multi-perspective Panoramas

 

Th Nov 17

Single View Reconstruction
 
 

  Slides (ppt, pdf)

  Reading: Horry et al, “Tour into the Picture”, SIGGRAPH ‘97

 

Tu Nov 22

More Single View Geometry
    
 

  Slides (ppt, pdf)

 

Tu Nov 29

High Dynamic Range Images

Slides (ppt, pdf)

Reading: Debevec & Malik, “Recovering High Dynamic Range Radiance Maps from Photographs”, SIGGRAPH 1997

Th Dec 1

Image-based Lighting
   

Slides (ppt, pdf)
Reading:
 Debevec, Rendering Synthetic Objects in Real Scenes, 1998

Tu Dec 6

Image-based Lighting II

Slides (ppt, pdf)
Reading:
 Debevec, Virtual Cinematography: Relighting Through Computation, IEEE Computer Aug 2006

Th Dec 8

Virtual Double Guest Lecture (Bill Freeman and Steve Seitz)
stereosteveDt.gif (3691 bytes)

 

CAMERAS:
Although it is not required, students are highly encouraged to obtain a digital camera for use in the course (one can get a pretty good camera for under $150). A camera might be available on load from the instructor.

METHOD OF EVALUATION:
Grading will be based on a set of programming and written assignments (60%), an exam (20%) and a final project (20%). For the programming assignments, students will be allowed a total of 5 (five) late days per semester; each additional late day will incur a 10% penalty.

Students taking 15-862 will also be required to submit a conference-style paper describing their final project.

MATLAB:
Students will be encouraged to use Matlab (with the Image Processing Toolkit) as their primary computing platform. Besides being a great prototyping environment, Matlab is particularly well-suited for working with image data and offers tons of build-in image processing functions. Here is a link to some useful Matlab resources

PREVIOUS OFFERINGS OF THIS COURSE:
Previous offerings of this course can be found here.

SIMILAR COURSES IN OTHER UNIVERSITIES: