Digital Image Processing 0909.452.01/0909.552.01 Fall 2001 - PowerPoint PPT Presentation

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Digital Image Processing 0909.452.01/0909.552.01 Fall 2001

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Lecture 11 November 26, 2001 Shreekanth Mandayam ECE Department ... Details Compression Model Discrete Cosine Transform Laser Based Ultrasound* Example: ... – PowerPoint PPT presentation

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Title: Digital Image Processing 0909.452.01/0909.552.01 Fall 2001


1
Digital Image Processing0909.452.01/0909.552.01
Fall 2001
Lecture 11November 26, 2001
  • Shreekanth Mandayam
  • ECE Department
  • Rowan University
  • http//engineering.rowan.edu/shreek/fall01/dip/

2
Plan
  • Digital Image Compression
  • Image Compression Standards
  • DCT (JPEG) Lossy
  • Lab 4 Digital Image Compression

3
DIP Details
4
Compression Model
5
Discrete Cosine Transform
  • Discrete Cosine Transform
  • Information Concentration
  • Data Compaction
  • Feature Extraction

gtgtdctdemo
6
Laser Based Ultrasound
Karta Technologies Inc., San Antonio, TX
7
Example Photothermal Shearography Images
Before Deformation - After Deformation
Fringe Pattern
Sample 10 0.254 mm depth -605.36 MPa stress
8
Preprocessing
Fringe Pattern
DCT Coefficients
DCT
Zonal Mask
(1,1) (1,2) (2,1) (2,2) . . .
Artificial Neural Network
Feature Vector
9
JPEG Compression Standard
Compute DCT F(u,v)
Reorder to form 1-D Sequence
Level Shift
f(x,y)
Normalize
Compute DC Coefficient
Compute AC Coefficients
http//www.jpeg.org/
10
Karhunen-Loeve (Hotelling) Transform
Hotelling transform of x
demos/demo7klt/
11
Lab 4 Digital Image Compression
http//engineering.rowan.edu/shreek/fall01/dip/la
b4.html
12
Summary
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