1. Simulation And Modeling
Prepared by-
Sabbir Muhammad Saleh
Lecturer (00627)
University of South Asia
Mob
Mail-

2. Introduction to MATLAB
Engineering H192
Winter 2005
Introduction to MATLAB
Instructor notes:
This is the first set of slides for Matlab in the H192 C/C++ programming course. It provides an overview of information that will be helpful in getting started working with Matlab and in the Matlab environment.
Lecture 18

3. So why MATLAB and IMAGE PROCESSING ?
Images
So why MATLAB and IMAGE PROCESSING ?
Images can be treated as matrices !

4. a = imread(‘picture.jpg’); imshow(a);
Images
Loading an image:
a = imread(‘picture.jpg’);
imshow(a);

5. Images
Image (=matrix) size:
size(a):
R G B
384
512

6. Images
Color image:
3D Matrix of RGB planes

7. Images
Show RED plane:
a(:,:,2:3) = 0;
imshow(a);

8. Images
Show GREEN plane:
a(:,:,[1 3]) = 0;
imshow(a);

9. Images
Show BLUE plane:
a(:,:,1:2) = 0;
imshow(a);

10. Advanced: Shuffling columns
Images
Advanced: Shuffling columns
rn = rand(1,512);
[rn1,i] = sort(rn);
b = a(:,i,:);
imshow(b);

11. Images

12. By the way…
MATLAB can also handle
Movies
3D objects …

13. MATLAB is a mighty tool to manipulate matrices
Conclusion
MATLAB is a mighty tool to manipulate matrices
Images can be treated as matrices
MATLAB is a mighty tool to manipulate images

14. MATLAB should be used to code software prototypes
In my opinion…
MATLAB should be used to code software prototypes
Research is mostly about prototypes, not runtime-optimized software
MATLAB should be used in research

15. Algorithm development time is drastically shorter in MATLAB
In my opinion…
MATLAB prototypes must be re-coded (e.g. in C++) if there’s need for speed
Algorithm development time is drastically shorter in MATLAB

16. Image Algebra
A+B (matrix addition)
A-B
Examples:
Matlab program: algebraEx.m
Quick Matlab overview
Homework:
Write a Matlab program that computes
a complement image to a given gray level image A

17. Thank You