Computer Vision Fundamentals

Date	Lecture Content Slides are available from \\badar\common\cs436, and are not accessible from outside LUMS. Material in these slides (including images, data etc.) must not be used for commercial benefit without instructor's written permission.	Notes
6 Sep 2005 Monday	Lecture 1 [download]: Course introduction and policies Introduction of Computer Vision area The complexity of high-level vision tasks Human perception, and cues that aid in perception Modules of the course Image Representation Image coordinates Homogeneous coordinates Binary, Gray-scale and Color images Example operations on images Image Histogram (gray-scale histogram, color histogram)
8 Sept 2005 Thursday	Lecture 2 [6 slides per page, 2 slides per page]: Image Representation Image coordinates Homogeneous coordinates Binary, Gray-scale and Color images Example operations on images Image Histogram (gray-scale histogram, color histogram) Cameras Aperture Shutter speed Digital cameras Video cameras Interlacing, progressive scan Human eye Portable Bit Map Formats PGM, PPM file formats Reading/Writing binary pgm/ppm files Transformations Example Application: Image Registration Transformations in 2D Scaling Rotation Translation Shear in x- and y-direction	Assignment 0 (no credit) Write functions ReadBinPGM, ReadBinPPM, WriteBinPGM, WriteBinPPM in C/C++ Example PPM/PGM Files: mecca06.pgm, mecca06.ppm, owl.pgm, owl.ppm (Owl is taken from Dr Soahib's http://web.lums.edu.pk/~sohaib/photographs/birds/index.htm ) One of the good viewer is Irfanview. Download from http://www.irfanview.com/ or Locally (You can convert images from other formats to the pgm or ppm format by opening them in Irfanview and then saving in the desired format) Format specification: [pbm.txt][pgm.txt][ppm.txt] [Thanks to Numan Sheikh for sending us. See www.wotsit.org for these and more format specs] Reading Shah's Book: Section 1.1, 1.2, 1.3
13 Sept 2005 Tuesday	Lecture 3 [6 slides per page, 2 slides per page]: Transformations Inverse transformations Concatenation of transformations Rotation about arbitrary point Importance of order Affine Transformation Rigid Body Transformation Recovering the best affine transformation from correspondences Least Squared Error solution Pseudo Inverse 2D Displacement Models Projective Transformation	Reading: Steve Mann's paper on video orbits [web] [local] contains a nice introduction to these transformations (see sections I and II of this paper)
15 Sept 2005 Thursday	Lecture 4 [6 slides per page, 2 slides per page]: 2D Displacement models Other Displacement Models Bi-quadratic Bilinear Pseudo-perspective 2D Affine Warping Bilinear Interpolation Assignment 1: Basic Task	Assignment 1: Full Text uploaded Due: 27 Sept 2005, Tuesday, 17:00 Reading: Shah 1.1-1.3 Look at the problems of the Dr Shah's Book Chapter 1
till 6th Oct.2005	Lecture 5,6 and 7 [ 8 slides per page , 4 slides per page]: Rest of Module 1 [6 slides per page, 2 slides per page]: 3D Translation and Scaling 3D Rotation Rotations about principal axes Small angle approximation Rotation about arbitrary axis Rodrigues' Formula Eigenvalues and Eigenvectors of Rotation Matrix Frames of Reference Pinhole Camera Perspective Transform Camera Models Orthographic Projection Interpretation of Projective and Affine Projections Camera Calibration Stereo (introduction) Concept of Disparity Epipolar Constraint Basic Stereo Derivations Results	Assignment 2 : Problems, Module 1 [handout] You will find the related topics in the reading material. Have a look at the Exercises of Chapter 1 (Dr.Shah) "Computer Vision A Modern Approach" has more rigorous material on the Stereo