1. S. Mandayam/ DIP/ECE Dept./Rowan University Digital Image Processing ECE.09.452/ECE.09.552 Fall 2009 Shreekanth Mandayam ECE Department Rowan University http://engineering.rowan.edu/~shreek/fall09/dip/ Lecture 8 November 23, 2009

2. S. Mandayam/ DIP/ECE Dept./Rowan University Plan Digital Image Compression Standards DCT (JPEG): Lossy LZW (GIF, TIFF, ZIP): Lossless Lab 4: Digital Image Compression Discussion: Final Project

3. S. Mandayam/ DIP/ECE Dept./Rowan University DIP: Details

4. S. Mandayam/ DIP/ECE Dept./Rowan University Fundamentals Justification Applications Principle Redundancy Types Lossy Lossless demos/demo6dithering/

5. S. Mandayam/ DIP/ECE Dept./Rowan University Compression Model f(x,y) Transform Quantize Encode Source Channel >>dct2 /demo10dct/dctdemo

6. S. Mandayam/ DIP/ECE Dept./Rowan University Discrete Cosine Transform Information Concentration Data Compaction Feature Extraction Discrete Cosine Transform >>dct2 /demo10dct/dctdemo

7. S. Mandayam/ DIP/ECE Dept./Rowan University Laser Based Ultrasound* *Karta Technologies Inc., San Antonio, TX

8. S. Mandayam/ DIP/ECE Dept./Rowan University Example: Photothermal Shearography Images Before Deformation - After Deformation = Fringe Pattern Sample 10 0.254 mm depth -605.36 MPa stress

9. S. Mandayam/ DIP/ECE Dept./Rowan University Preprocessing Fringe Pattern DCT DCT Coefficients Zonal Mask 1 23451 2345 1 2 3 4 5 (1,1) (1,2) (2,1) (2,2). Feature Vector Artificial Neural Network

10. S. Mandayam/ DIP/ECE Dept./Rowan University JPEG Compression Standard f(x,y) Level Shift Compute DCT F(u,v) Normalize Reorder to form 1-D Sequence Compute DC Coefficient Compute AC Coefficients http://www.jpeg.org/

11. S. Mandayam/ DIP/ECE Dept./Rowan University LZW Algorithm Initialize string table with single character strings Read first input character = w Read next input character = k No more k’s? Output = code(w) Stop wk in string table? Output = code(w) w = wk w = k Put wk in string table y n n y United States Patent No. 4,558,302, Patented by Unisys Corp.

12. S. Mandayam/ DIP/ECE Dept./Rowan University Karhunen-Loeve (Hotelling) Transform Hotelling transform of x demos/demo7klt/

13. S. Mandayam/ DIP/ECE Dept./Rowan University Lab 3: Digital Image Restoration http://engineering.rowan.edu/~shreek/fall09/dip/lab3.html

14. S. Mandayam/ DIP/ECE Dept./Rowan University Lab 4: Digital Image Compression http://engineering.rowan.edu/~shreek/fall09/dip/lab4.html

15. S. Mandayam/ DIP/ECE Dept./Rowan University Final Project

16. S. Mandayam/ DIP/ECE Dept./Rowan UniversitySummary