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Digital Image Processing ECE.09.452/ECE.09.552 Fall 2007

Digital Image Processing ECE.09.452/ECE.09.552 Fall 2007. Lecture 10 November 26, 2007. Shreekanth Mandayam ECE Department Rowan University http://engineering.rowan.edu/~shreek/fall07/dip/. Plan. Recall: Digital Image Compression Fundamental principles Image Compression Model

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Digital Image Processing ECE.09.452/ECE.09.552 Fall 2007

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  1. Digital Image ProcessingECE.09.452/ECE.09.552Fall 2007 Lecture 10November 26, 2007 Shreekanth Mandayam ECE Department Rowan University http://engineering.rowan.edu/~shreek/fall07/dip/

  2. Plan • Recall: Digital Image Compression • Fundamental principles • Image Compression Model • Recall: Information Theory • Image Compression Standards • DCT (JPEG): Lossy • LZW (GIF, TIFF, ZIP): Lossless • Lab 3: Digital Image Restoration • Lab 4: Digital Image Compression • Discussion: Final Project

  3. DIP: Details

  4. Fundamentals • Justification • Applications • Principle • Redundancy • Types • Lossy • Lossless • demos/demo6dithering/

  5. Transform Quantize • Encode • Source • Channel f(x,y) Compression Model

  6. Information Concentration Data Compaction Feature Extraction Discrete Cosine Transform Discrete Cosine Transform >>dctdemo

  7. Laser Based Ultrasound* *Karta Technologies Inc., San Antonio, TX

  8. Example: Photothermal Shearography Images Before Deformation - After Deformation = Fringe Pattern Sample 10 0.254 mm depth -605.36 MPa stress

  9. 1 2 3 4 5 1 2 3 4 5 Preprocessing Fringe Pattern DCT Coefficients Zonal Mask DCT (1,1) (1,2) (2,1) (2,2) . . . Artificial Neural Network Feature Vector

  10. 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/

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

  12. Karhunen-Loeve (Hotelling) Transform Hotelling transform of x • demos/demo7klt/

  13. Lab 3: Digital Image Restoration http://engineering.rowan.edu/~shreek/fall07/dip/lab3.html

  14. Lab 4: Digital Image Compression http://engineering.rowan.edu/~shreek/fall07/dip/lab4.html

  15. Final Project

  16. Summary

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