Introduction of Digital Image Processing - LTAN

8/8/2019 Introduction of Digital Image Processing - LTAN

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Introduction and Fundamentals

of Digital Image Processing

Lai Thi Anh NgaJune, 26th 2010


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Introduction

Instructor: Lai Thi Anh Nga

Email: [email protected]

Research interests:

Image processing, computer vision, multimedia,video coding

References:

R.C. Gonzalez and R.E. Woods, Digital ImageProcessing, 3rd Ed.,Prentice-Hall2007

R.C. Gonzalez and R.E. Woods, Digital Image

Processing using MATLAB , 3rd Ed., Prentice-Hall2004
mailto:[email protected]:[email protected]


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Survey

What is Picture? Image?

What is Digital Image?


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History of Digital Image


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The born of Digital Computers & DIP

The images in previous slides are digital; but

they are NOT considered as the results of DIP

What do we mean by Digital Image Processing?

Processing digital images by a digital computer

DIP has been dependent on the development of

digital computers and other supporting

technologies (e.g., data storage, display and

transmission)


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The Boom of Digital Images in the

Last 20 Years

Acquisition

Digital cameras, scanners

MRI and Ultrasound imaging

Infrared and microwave imaging

Transmission

Internet, wireless communication

Display

Printers, LCD monitor, digital TV


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What is a digital image?

What is an image? Picture, Photograph

Visual data

Usually two- or three-dimensional What is a digital image?

An image which is discretized, i.e., defined ona discrete grid (ex. scanner)

Two-dimensional collection of light intensityvalues (or gray values)

Matrix, two-dimensional function


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What is digital image processing?

DIP deals with the manipulation and

analysis of pictures by a computer.

Improve pictorial information for better

clarity (human interpretation).

Automatic machine processing of scene data

(interpretation by a machine/non-human,

storage, transmission).


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DIP in Early Projects (1)

Space project:

The first picture of moon by

US spacecraft Ranger 7 on

July 31, 1964 at 9:09AM EDT


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DIP in Early Projects (2)

Computer TomographySir Godfrey N. Housefield

and Prof. Allan M. Cormackshared 1979 Nobel Prize in

Medicine for the invention of CT


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Photography (3)


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Motion Pictures (4)


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Law Enhancement and

Biometrics (5)


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Light Microscopy (6)


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Automated Visual Inspection


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Levels in Image Processing

Level 0: Image representation (acquisition,sampling, quantization, compression)

Level 1: Image-to-image transformations

(enhancement, restoration, segmentation) Level 2: Image-to-parameter transformation

(feature selection)

Level 3: Parameter-to-decisiontransformation (recognition andinterpretation)


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Image Processing and Analysis

Transformations

Image Processing: Levels 0 and 1

Image Analysis: Levels 1 and 2

Computer/Robot Vision: Levels 2 and 3 Computer Graphics/Animation ?

This mainly involves creating images or visual

effects from a given description.

Image processing and analysis is mainly

concerned with interpreting a given image.


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Fundamental steps in DIP


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A DIP System


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Tour Guide for a Beginner


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Specific Objectives

Know basics of digital image processingincluding image acquisition,perception,transformation, compression, enhancement,

interpolation, restoration, analysis, and so on MATLAB:

Implement basic image processing algorithms

Some functions provided by MATLAB imageprocessing toolbox

Library for DIP: OpenCV, AForge


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Q&A

Documents

Introduction of Digital Image Processing - LTAN