1. S. Mandayam/ DIP/ECE Dept./Rowan University Digital Image Processing 0909.452.01/0909.552.01 Fall 2001 Shreekanth Mandayam ECE Department Rowan University http://engineering.rowan.edu/~shreek/fall01/dip/ Lecture 2 September 17, 2001

2. S. Mandayam/ DIP/ECE Dept./Rowan UniversityPlan Pixel Operations Point processing Histogram equalization Connectivity Lab Project 1 individual pixels all pixels neighboring pixels

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

4. 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 >>imadjdemo >>imadjust

5. S. Mandayam/ DIP/ECE Dept./Rowan University Point Processing 0 L-1 0 0 0 r s r s r1r1 r2r2 s1s1 s2s2  >>imadjdemo >>imadjust

6. S. Mandayam/ DIP/ECE Dept./Rowan University Image Histogram >>imadjdemo >>imhist

7. S. Mandayam/ DIP/ECE Dept./Rowan University Histogram Equalization (Balancing) >>imadjdemo >>histeq

8. S. Mandayam/ DIP/ECE Dept./Rowan University Pixel Connectivity (x+1,y-1) (x,y) (x+1,y) (x+1,y+1) (x,y+1) (x-1,y+1) (x-1,y-1) (x,y-1) (x-1,y) x y

9. S. Mandayam/ DIP/ECE Dept./Rowan University Labeling of Connected Components Begin scan Position: (x,y) p(x,y) = 1? p(x-1,y) = 1? p(x,y-1) = 1? p(x-1,y) AND p(x,y-1) = 1? class(x,y) = new class Update position (x,y) class(x,y) = class(x-1,y) class(x,y) = class(x,y-1) class(x-1,y) = class(x,y-1) All positions scanned? End scan y y y y y

10. S. Mandayam/ DIP/ECE Dept./Rowan University Image Preprocessing Enhancement Restoration Spatial Domain Spectral Domain Point Processing >>imadjust >>histeq Spatial filtering >>filter2 Filtering >>fft2/ifft2 >>fftshift Inverse filtering Wiener filtering

11. S. Mandayam/ DIP/ECE Dept./Rowan University Lab 1: Pixel Operations http://engineering.rowan.edu/~shreek/fall01/dip/lab1.html

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