digital image processing and edge detection

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Outline Introduction Examples of fields that use Digital Image Processing Visibility: Depends on human perception Fundamental Definitions Analysis of edge detection algorithms Questions Digital Image Processing and Edge Detection Seda Albayrak Computer Science Department of Istanbul Bilgi Univercity Seda Albayrak Digital Image Processing and Edge Detection

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This presentation is an introduction for digital image processing and edge detection which covers them on four topic; example of fields that use digital image processing, visibility that depends on human perception, fundamental definition of an image, analysis of edge detection algorithms such as Roberts, Prewitt, Sobel and Laplacian of a Gaussian.

TRANSCRIPT

Page 1: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

Digital Image Processing and Edge Detection

Seda Albayrak

Computer Science Department of Istanbul Bilgi Univercity

Seda Albayrak Digital Image Processing and Edge Detection

Page 2: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

1 Introduction

2 Examples of fields that use Digital Image Processing

3 Visibility: Depends on human perception

4 Fundamental Definitions

5 Analysis of edge detection algorithms

6 Questions

Seda Albayrak Digital Image Processing and Edge Detection

Page 3: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

Do you think that is all?

Figure: Visible Light

Seda Albayrak Digital Image Processing and Edge Detection

Page 4: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

More than your eyes can see

Figure: Electromagnetic SpectrumSeda Albayrak Digital Image Processing and Edge Detection

Page 5: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

Gamma-Ray Imaging

Figure: The gamma-ray moon

Seda Albayrak Digital Image Processing and Edge Detection

Page 6: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

X-Ray Imaging

Figure: X-ray photo of a one year old girl

Seda Albayrak Digital Image Processing and Edge Detection

Page 7: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

Ultraviolet Imaging

Figure: Ultaviolet and visible light of galaxies

Seda Albayrak Digital Image Processing and Edge Detection

Page 8: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

Imaging in infrared bands

Figure: TV’s remote and temperature control

Seda Albayrak Digital Image Processing and Edge Detection

Page 9: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

Imaging in microwave band

Figure: Plate reading

Seda Albayrak Digital Image Processing and Edge Detection

Page 10: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

Are you fallible about what you see?

Figure: Examples of some well-known optical illusions andsimultaneous contrast

Seda Albayrak Digital Image Processing and Edge Detection

Page 11: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

What do you see in this picture?

What is digital image?What is pixel?

What is intensity level?What is edge detection?

What is edge detection used for?

Seda Albayrak Digital Image Processing and Edge Detection

Page 12: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

Digital convolution

Seda Albayrak Digital Image Processing and Edge Detection

Page 13: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

Taking first derivative of a greylevel image

Seda Albayrak Digital Image Processing and Edge Detection

Page 14: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

Roberts, Prewitt and Sobel edge detectors

Figure: Masks of first order edge detection algorithms

What are their properties?Seda Albayrak Digital Image Processing and Edge Detection

Page 15: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

Laplacian of a Gaussian edge detection algorithm

What about noise?

Seda Albayrak Digital Image Processing and Edge Detection

Page 16: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

What is the difference?

Which one is best?

Seda Albayrak Digital Image Processing and Edge Detection

Page 17: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

An example of a simple way

Seda Albayrak Digital Image Processing and Edge Detection

Page 18: Digital Image Processing and Edge Detection

OutlineIntroduction

Examples of fields that use Digital Image ProcessingVisibility: Depends on human perception

Fundamental DefinitionsAnalysis of edge detection algorithms

Questions

Any Questions?

Wake up! Any questions?

Seda Albayrak Digital Image Processing and Edge Detection