Materi kuliah umum kapita selekta di ITTelkom, 13 Oktober 2012

1. Kuliah Umum Kapita Selekta ITTelkom, 13 Oktober 2012
Peb Ruswono Aryan
http://about.me/peb

3.  Peb Ruswono Aryan
 Edu :
 S1 Informatika ITB, 2002-2007
 S2 Informatika ITB, 2008-2010
 Work :
 R & D, Digital Mark Reader (DMR), 2007-2010
 Dosen, STEI ITB, 2010-present
 Interest :
 Visualization
 Image Processing and Interpretation

4. + =

5. 

6.  Multiscale tricks
 If it must fail, it must fail early
 Iterative Reduction by (re-)Weighting

8.  Statistical Model of Shape & Appearance for
constrained search [Tim Cootes]
 Shape : point location
 Appearance : image patch around point
 X = Xavg + StdDev  X = Xavg + Pb
 P : PCA , b : parameter (reduced search space)
 Steps :
 Foreach point in shape model:
▪ Find most similar patches along normal direction
▪ Test if current shape fit with learned model
▪ Continue until convergence

10.  Hx = z, given x & z, find H
 Set of pair of matched points
 Overdetermined system of linear equation
 RANSAC
 Pick small subset
 Calculate H
 Check whether H is supported by the rest of
population
 Select best H with biggest support (minimize
error)

13. Color
consistency!

14.  Poisson Equation
 Laplace(source[mask]) = Laplace(dest[mask])
 Boundary Condition : destination pixels
 Discrete Poisson Operator
 Sparse Matrix Linear Solver
 Direct
 Iterative Relaxation
 http://pebbie.wordpress.com/2012/10/21/poisson-image-editing-revised/

18.  Poisson Equation where f = 0
 Result : Smooth interpolation

19. This is gone

20.  Fill patches with highest information content
 Structure (edge)
 Boundary-patch
 High variance : chaotic textures (e.g. grass)
 Low variance : plain

25.  Math can also means Fun especially when it’s
applied, you don’t know what you’ve
missed
 Innovation in Research seeks the balance
between pragmatic and platonic (practical vs
ideal), there are still lot of areas to explore
 For everything one can imagine, someone is
making it somewhere

26.  DO NOT Afraid!
 DO NOT Worry!
 DO NOT Hesitate!

27. Please ask me!