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.

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Digital Image Processing and Edge Detection

  1. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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

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