Digital Image Processing Lecture - Rowan University

S. Mandayam/ DIP/ECE Dept./Rowan University Digital Image Processing ECE.09.452/ECE.09.552 Fall 2009 Lecture 1 September 14, 2009 Shreekanth Mandayam ECE Department Rowan University http://engineering.rowan.edu/~shreek/fall09/dip/

S. Mandayam/ DIP/ECE Dept./Rowan University http://www.apple.com/iphone/ S. Mandayam/ DIP/ECE Dept./Rowan University S. Mandayam/ DIP/ECE Dept./Rowan University Pillars of Creation Eagle Nebula (M16) Supernova remnant: Crab Nebula Galaxies from Ultra-Deep-Field

Jupiter http://hubblesite.org/ S. Mandayam/ DIP/ECE Dept./Rowan University S. Mandayam/ DIP/ECE Dept./Rowan University ABA E-13B Font S. Mandayam/ DIP/ECE Dept./Rowan University

S. Mandayam/ DIP/ECE Dept./Rowan University S. Mandayam/ DIP/ECE Dept./Rowan University S. Mandayam/ DIP/ECE Dept./Rowan University Biometrics S. Mandayam/ DIP/ECE Dept./Rowan University Plan What is an image? Mathematical representation of monochromatic images

What is a digital image? Digital image processing Fundamental steps Why do we need this? Course logistics Self-Assessment Test Sampling & Quantization Image Preprocessing Pre-Lab 1 S. Mandayam/ DIP/ECE Dept./Rowan University

Images column Sample f(x, y) Quantize y x row

S. Mandayam/ DIP/ECE Dept./Rowan University Digital Image y 128 127 1 . . 255 . . . . . . . . 120

f(x,y) . . . . . . . . . .

x Gray Level S. Mandayam/ DIP/ECE Dept./Rowan University Color Images M R

B W Y C G Mixtures of Light: Additive Primaries S. Mandayam/ DIP/ECE Dept./Rowan University B

B G G R R R+G+B

R+G+B B B G G R R+G+B

R B B G G R R+G+B

R+G+B R R+G+B S. Mandayam/ DIP/ECE Dept./Rowan University RGB Color Space S. Mandayam/ DIP/ECE Dept./Rowan University

Fundamental Steps Preprocessing Preprocessing Problem Domain Image Image Acquisition Acquisition

Segmentation Segmentation Knowledge Knowledge Base Base Representation Representation&& Description Description Recognition

Recognition&& Interpretation Interpretation Result S. Mandayam/ DIP/ECE Dept./Rowan University The Human Eye Sagittal section of adult human eye Section of human retina

http://webvision.med.utah.edu/anatomy.html S. Mandayam/ DIP/ECE Dept./Rowan University Perceived Brightness S. Mandayam/ DIP/ECE Dept./Rowan University Perceived Contrast S. Mandayam/ DIP/ECE Dept./Rowan University

Optical Illusions S. Mandayam/ DIP/ECE Dept./Rowan University DIP: Details D ig ita l Im a g e P r o c e s s in g D ig ita l Im a g e C h a r a c te ris tic s S p a tia l G r a y -le v e l

S p e c tra l H is to g r a m DFT DC T P r e -P r o c e s s in g Enhancem ent P o in t P r o c e s s in g

M a s k in g R e s to r a tio n F ilte r in g D e g r a d a tio n M o d e ls In v e r s e F ilte r in g C o m p r e s s io n

In fo r m a tio n T h e o ry L o s s le s s Lossy L Z W (g if) T r a n s fo r m -b a s e d (jp e g ) S e g m e n ta tio n E d g e D e te c tio n

D e s c r ip tio n S h a p e D e s c r ip to rs T e x tu re M o r p h o lo g y W ie n e r F ilt e r i n g S. Mandayam/ DIP/ECE Dept./Rowan University DIP: Course Logistics

http://engineering.rowan.edu/~shreek/fall09/dip/ S. Mandayam/ DIP/ECE Dept./Rowan University Sampling & Quantization Sampling demos/demo1sampling_and_quantization/demo_sampling.m Quantization demos/demo1sampling_and_quantization/demo_quant.m S. Mandayam/ DIP/ECE Dept./Rowan University

Image Preprocessing Restoration Enhancement Spectral Domain Spatial Domain Point Processing >>imadjust

>>histeq Spatial filtering >>filter2 Filtering >>fft2/ifft2 >>fftshift Inverse filtering Wiener filtering S. Mandayam/ DIP/ECE Dept./Rowan University

Point Processing (Intensity Transformation) s(x,y) = T{ r(x,y)} Transformed Gray Level Original Gray Level Transformation Function >>imadjust

S. Mandayam/ DIP/ECE Dept./Rowan University Pre-Lab 1: Intro to Matlab IP Toolbox http://engineering.rowan.edu/~shreek/fall09/dip/ipintro.html S. Mandayam/ DIP/ECE Dept./Rowan University Summary

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