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Correspondence Problems in Computer Vision

Winter Term 2010/2011

Correspondence Problems in Computer Vision

Computer Science Teaching Award (summer term 2008)

Lecturers: Henning Zimmer, Dr. Andrés Bruhn
Office hours: Friday, 14:15 - 15:15

Assistant: Oliver Demetz

Winter Term 2010/2011

Lectures (2h) with programming/theoretical exercises (2h)
(6 credit points)

Lectures: Wednesday 14-16 c.t., Building E1.3, Lecture Hall 003

First lecture: Wednesday, October 20, 2010.

Tutorials: 2 hours each week

Group 1: Thursday, 14-16 c.t. (Henning Zimmer)
Tutorials: Building E1.1, Room 3.06 (theory)
Tutorials: Building E1.3, Cip-Pool 104 (programming)

Group 2: Thursday, 16-18 c.t. (Oliver Demetz)
Tutorials: Building E1.3, SR 015 (theory)
Tutorials: Building E2.4 (math building), Cip-Pool U009 (programming)

NEWS:

26/04/2011: The certificates are ready! More information below!

24/03/2011:The grades for the second written exam are available!
01/03/2011:The grades for the first written exam are available!

08/02/2011: Sample solutions to the self-test problems are online; see below.
04/02/2011: There was a small bug in the mutual information programming excercise (P13).
I thus updated the source code below and you can download a sample solution here.
28/10/2010: Registration is now closed. You can check here in which group you are enrolled.
28/10/2010: The exam dates are now fixed. See below!
26/10/2010: Due to numerous requests, we now offer two tutorial groups, see above.
20/10/2010: Tutorials start next week!
20/10/2010: Check below for updates concerning the exam policy.

Prerequisites – Synopsis – Planned Contents – Assignments – References

Example - Stereo Reconstruction

Example - Motion Estimation

Requires undergraduate knowledge in mathematics (e.g. ''Mathematik für Informatiker I-III'') . Knowledge in image processing or differential equations is useful. The lectures will be given in English.

Correspondence problems are a central topic in computer vision. The basic task amounts to identifying and matching corresponding features in different images/views of the same scene. Typical examples for correspondence problems are (i) the estimation of motion information from consecutive frames of an image sequence (optic flow), (ii) the reconstruction of a 3-D scene from a stereo image pair and (iii) the registration of medical image data from different image acquisition devices (e.g. CT and MRT).
The central part of this lecture is concerned with discussing the most important correspondence problems together with suitable algorithms for their solution.

This class is particularly useful for those students who wish to to pursue a diploma or master thesis in our group in the field of computer vision.

Date	Topic
20/10	Introduction, Overview
27/10	Block Matching, Correlation Techniques, Occlusion Detection
03/11	Optic Flow I: Local Differential Methods, Parameterisation Models
10/11	Feature-based Methods: KLT Tracker and SIFT Matching
17/11	Optic Flow II: Global Differential Methods, Horn and Schunck
24/11	Optic Flow III: Advanced Constancy Assumptions, Large Motion
01/12	Optic Flow IV: Advanced Data and Smoothness Terms
08/12	Optic Flow V: High Accuracy Methods
15/12	Optic Flow VI: Advanced Numerics
05/01	Stereo Matching I: Projective and Epipolar Geometry
12/01	Stereo Matching II: Estimation of the Fundamental Matrix
19/01	Optic Flow + Stereo: Scene Flow Estimation
26/01	Medical Image Registration: Mutual Information, Elastic and Curvature Based Registration, Landmarks
02/02	Particle Image Velocimetry: Div-Curl-Regularisation, Incompressible Navier Stokes Prior
09/02	Summary, Outlook

Programming excercises and theoretical assignments are offered as part of the tutorials. The regular attendence of these excercises is requirement for admission to the exam.

Date	Assignment
28/10	P1 - Programming Assignment Sources
11/11	P3 - Programming Assignment Sources
25/11	P5 - Programming Assignment Sources
09/12	P7 - Programming Assignment Sources
06/01	P9 - Programming Assignment Sources
20/01	P11 - Programming Assignment Sources
03/02	P13 - Programming Assignment Sources

Date	Self-Test Problems
02/02	Self-Test Problems
08/02	Self-Test Problems - Solutions

Please remember that you have to register online for the lecture/exam in the HISPOS system of the Saarland University

We will write a written exam and a second chance exam at the end of the lecture-free period.
The better grade of both exams will count.

The first written exam takes place on Wednesday, February 23 from 2 to 4 PM
in Building E1.3, Lecture Hall 002.

The second written exam takes place on Wednesday, March 23 from 2 to 4 PM
in Building E1.3, Lecture Hall 002.

The results of the second written exam can be queried via our online query form.

The results of the first written exam can be queried via our online query form.

If you want to inspect your exam sheet, write me a mail to negotiate an appointment. Please also let me know if you do not want to inspect your exam, as I can only prepare the certificates (Scheine) after the last inspection.

The following thresholds were applied to determine the grades:

• 1.0 : 30 - 28 points
• 1.3 : 27 - 27
• 1.7 : 26 - 25
• 2.0 : 24 - 24
• 2.3 : 23 - 22
• 2.7 : 21 - 21
• 3.0 : 20 - 19
• 3.3 : 18 - 18
• 3.7 : 17 - 17
• 4.0 : 16 - 15
• 5.0 : 14 - 0

CERTIFICATES (SCHEINE):
The certificates (Scheine) are issued by the office of the Mathematics Department. They can be obtained from Mrs. Voss, Building E 2.4, Room 111 (math building, ground floor, 8.15-11.30 AM).

There is no specific book that covers the complete content of this class. Many lectures will be based on articls from journals and conferences. However, the following three books cover most topics:

1. Optic Flow
   A. Bruhn: Variational Optic Flow Computation: Accurate Modeling and Efficient Numerics.
   Ph.D. Thesis, 2006. Available from /bruhn/PhDThesis.pdf
   
   
2. Stereo Reconstruction
   O. Faugeras and Q.-T. Luong: The Geometry of Multiple Images. MIT Press, 2001.
   
   
3. Medical Image Registration
   J. Modersitzki: Numerical Methods for Image Registration. Oxford Press, 2003.
   
   

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