S. Mandayam/ DIP/ECE Dept./Rowan University Digital Image Processing ECE.09.452/ECE.09.552 Fall 2009 Shreekanth Mandayam ECE Department Rowan University.

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S. Mandayam/ DIP/ECE Dept./Rowan University Digital Image Processing ECE /ECE Fall 2009 Shreekanth Mandayam ECE Department Rowan University Lecture 8 November 23, 2009

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

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

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

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

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

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

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

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

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

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.

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

S. Mandayam/ DIP/ECE Dept./Rowan University Lab 3: Digital Image Restoration

S. Mandayam/ DIP/ECE Dept./Rowan University Lab 4: Digital Image Compression

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

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