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Point Processing

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Title: Introduction Author: efros Created Date: 8/29/2004 11:15:23 PM Document presentation format: On-screen Show (4:3) Company: Carnegie Mellon University – PowerPoint PPT presentation

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Title: Point Processing


1
Point Processing
15-463 Computational Photography Alexei Efros,
CMU, Spring 2010
Some figures from Steve Seitz, and Gonzalez et al.
2
Image Processing
  • image filtering change range of image
  • g(x) h(f(x))

image warping change domain of image g(x)
f(h(x))
3
Image Processing
  • image filtering change range of image
  • g(x) h(f(x))

f
g
image warping change domain of image g(x)
f(h(x))
f
g
4
Point Processing
  • The simplest kind of range transformations are
    these independent of position x,y
  • g t(f)
  • This is called point processing.
  • What can they do?
  • Whats the form of t?
  • Important every pixel for himself spatial
    information completely lost!

5
Basic Point Processing
6
Negative
7
Log
8
Power-law transformations
9
Image Enhancement
10
Contrast Stretching
11
Image Histograms
Cumulative Histograms
s T(r)
12
Histogram Equalization
13
Limitations of Point Processing
  • Q What happens if I reshuffle all pixels within
    the image?
  • A Its histogram wont change. No point
    processing will be affected
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