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.

1. 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

2. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis 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

3. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis of edge detection algorithms
Questions
Do you think that is all?
Figure: Visible Light
Seda Albayrak
Digital Image Processing and Edge Detection

4. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis of edge detection algorithms
Questions
More than your eyes can see
Figure: Electromagnetic Spectrum
Seda Albayrak
Digital Image Processing and Edge Detection

5. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis of edge detection algorithms
Questions
Gamma-Ray Imaging
Figure: The gamma-ray moon
Seda Albayrak
Digital Image Processing and Edge Detection

6. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis 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

7. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis of edge detection algorithms
Questions
Ultraviolet Imaging
Figure: Ultaviolet and visible light of galaxies
Seda Albayrak
Digital Image Processing and Edge Detection

8. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis of edge detection algorithms
Questions
Imaging in infrared bands
Figure: TV’s remote and temperature control
Seda Albayrak
Digital Image Processing and Edge Detection

9. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis of edge detection algorithms
Questions
Imaging in microwave band
Figure: Plate reading
Seda Albayrak
Digital Image Processing and Edge Detection

10. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis of edge detection algorithms
Questions
Are you fallible about what you see?
Figure: Examples of some well-known optical illusions and
simultaneous contrast
Seda Albayrak
Digital Image Processing and Edge Detection

11. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis 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

12. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis of edge detection algorithms
Questions
Digital convolution
Seda Albayrak
Digital Image Processing and Edge Detection

13. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis of edge detection algorithms
Questions
Taking first derivative of a greylevel image
Seda Albayrak
Digital Image Processing and Edge Detection

14. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis of edge detection algorithms
Questions
Roberts, Prewitt and Sobel edge detectors
Figure: Masks of first order edge detection algorithms
Seda Albayrak
Digital Image Processing and Edge Detection

15. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis of edge detection algorithms
Questions
Laplacian of a Gaussian edge detection algorithm
What about noise?
Seda Albayrak
Digital Image Processing and Edge Detection

16. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis of edge detection algorithms
Questions
What is the difference?
Which one is best?
Seda Albayrak
Digital Image Processing and Edge Detection

17. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis of edge detection algorithms
Questions
An example of a simple way
Seda Albayrak
Digital Image Processing and Edge Detection

18. Outline
Introduction
Examples of fields that use Digital Image Processing
Visibility: Depends on human perception
Fundamental Definitions
Analysis of edge detection algorithms
Questions
Any Questions?
Wake up! Any questions?
Seda Albayrak
Digital Image Processing and Edge Detection