matlab and image processing workshop-skerg
DESCRIPTION
a workshop i performed for SKERG at KSU, 29th Oct.TRANSCRIPT
Introduction to MATLAB and Image
Processing
By :Sulaf alMagooshiwww.theSulaf.me
Sulaf Almagooshi, 2013 2
Purpose and Objectives
• Learn about Image Processing.• Discover MATLAB environment. • Learn about MATLAB features.• Discover Image processing toolbox at
MATLAB.• Develop a beginner level MATLAB
application.
Sulaf Almagooshi, 2013 3
Outline
• What is Image Processing?• MATLAB tour.• Image Processing in MATLAB.• Develop Image Processing Application.• Summary.
What Is Image Processing?
Sulaf Almagooshi, 2013 5
Computer imaging can be separate into two primary categories:
1. Computer Vision. 2. Image Processing.
What Is Image Processing?
Sulaf Almagooshi, 2013 6
The major topics within the field of image processing include:
1. Image restoration.2. Image enhancement.3. Image compression.
Image Processing topics
Sulaf Almagooshi, 2013 7
Image restoration
Sulaf Almagooshi, 2013 8
Image enhancement
Sulaf Almagooshi, 2013 9
Image compression
Sulaf Almagooshi, 2013 10
Image Analysis Process
The image analysis process can be broken down into three primary stages:
1.Preprocessing. 2.Data Reduction. 3. Features Analysis.
Sulaf Almagooshi, 2013 11
Applications of Image Processing
1.Midicine . 2.Security. 3. Astronomy.
MATLAB Tour
Sulaf Almagooshi, 2013 13
MATLAB Tour
Sulaf Almagooshi, 2013 14
MATLAB Tour - some tricks !
• To know if you already used a variable name• Use “ which”.
• To clear Command Window • Use “clc”
• To know your variables• Use “ who”
• To know your variable's info• Use “ whos”
• To know your files• Use “ what”
Sulaf Almagooshi, 2013 15
MATLAB Tour
If you needed Help:
Type help in Command window
Sulaf Almagooshi, 2013 16
MATLAB Tour
Sulaf Almagooshi, 2013 17
MATLAB TourM-files
• To store the code and execute later.
• The file name will become a function, when we call it it will execute the file.
• To open a new m-file , In the Command window , type edit
Sulaf Almagooshi, 2013 18
MATLAB TourEditor
Or..
Sulaf Almagooshi, 2013 19
MATLAB TourGUI
• MATLAB offers ‘ GUIDE’ tool to design graphic interface.
• In the Command window , type guide
Sulaf Almagooshi, 2013 20
MATLAB TourGUI
GUIDE tool
Image Processing in MATLAB.
Sulaf Almagooshi, 2013 22
Image Processing : Basic functions
Function Description
Imread to read an image into Matlab.
imshow To show image in a figure.
Figure To create an independent figure.
size(x) To know the min and max for an object.
imwrite(image, 'filename.type')
To save the image.
rgb2gray To convert a colored image to gray one.
Sulaf Almagooshi, 2013 23
Image Processing : Basic functions
Function Description
imhist(x) Create a histogram.
BW = im2bw(x) Convert to Binary image.
J = imnoise(a,'salt & pepper',d);
Add noise of type “ salt and pepper”.
IM2 = imcomplement(IM) computes the complement of the image IM.
SE = strel('square', 5); Create a structure.
IM2 = imdilate(a,SE); To dilates an image.
IM2= imerode(a,SE); To erode an image.
Sulaf Almagooshi, 2013 24
MATLAB Image Processing toolbox
imtool(f)
Activity :Develop Image
Processing Application
