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Chapter 8 Computer Vision

Chapter 8 Computer Vision. Contents. What is Image Processing? Digital Image Processing Electromagnetic Spectrum Steps in Digital Image Processing. What is Image Processing?. Application Area. Image Processing Fields. Image Processing Fields. Digital Image Processing.

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Chapter 8 Computer Vision

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  1. Chapter 8 Computer Vision

  2. Contents • What is Image Processing? • Digital Image Processing • Electromagnetic Spectrum • Steps in Digital Image Processing Chapter 9

  3. What is Image Processing? Chapter 9

  4. Application Area Chapter 9

  5. Image Processing Fields Chapter 9

  6. Image Processing Fields Chapter 9

  7. Digital Image Processing • “Digital Image”? • Digital • Image • “Image Processing”? Chapter 9

  8. Digital Image Processing What is a signal? A signal is a function that maps a set (domain) to another set (range) Chapter 9

  9. Digital Image Processing A signal is a function that maps a set (domain) to another set (range) For each point in time (t), assign a voltage value (y(t)). Domain = time interval Range = voltage interval Chapter 9

  10. Digital Image Processing • Image • An image is a two-dimensional signal A signal is called two-dimensional if the domain is two-dimensional Chapter 9

  11. Digital Image Processing • Image • An image is a two-dimensional signal Chapter 9

  12. Digital Image Processing • Digital Image • Vs Analog image? • Digital vs analog signal Chapter 9

  13. Signal Types • Domain • Range • Countable • Quantized Signal Chapter 9

  14. Digital Signal • A signal is “digital” • if both the domain andthe rangeare countable • I.e., if it is a quantized discrete-time (or -space) signal Chapter 9

  15. Digital Image Processing • Digital Image • A digital image is a two-dimensional signal with a countable domain and a countable range Chapter 9

  16. Digital Image Processing • Digital Image Chapter 9

  17. Digital Signal • How is a digital signal formed? • Discrete domain • Domain is inherently discrete, or • Sample a continuous interval • Discrete range • Range is inherently discrete, or • Sample a continuous interval Chapter 9

  18. Domain and Range • Continuous-time signals • t and y (t) have physical meanings • Digital signals • n and y (n) do not have physical meanings and can be arbitrary Chapter 9

  19. Digital Image Processing Fields Chapter 9

  20. Digital Images: 80 years ago 1921 Range has 5 values! 1922 1929 Chapter 9

  21. 1 2 3 4 5 6 7 Electromagnetic Spectrum : EM Chapter 9

  22. 1. Gamma-Ray Imaging Chapter 9

  23. 2. X-ray Imaging Chapter 9

  24. 3. UV Imaging Chapter 9

  25. 4. Visible Range Chapter 9

  26. 4. Visible Range 1964 Chapter 9

  27. 4. Visible Range Chapter 9

  28. 4. Multispectral: Visible+Infrared Bands Chapter 9

  29. 4. Multispectral: Visible+Infrared Bands Chapter 9

  30. 4. Multispectral: Visible+Infrared Bands Chapter 9

  31. 4. Multispectral: Visible+Infrared Bands Chapter 9

  32. 5. Infrared Range Chapter 9

  33. 6. Microwave Imaging: Radar Chapter 9

  34. 7. Radio Band Imaging Chapter 9

  35. Electromagnetic Spectrum Chapter 9

  36. Chapter 9

  37. Ultrasound Image head head Chapter 9

  38. Chapter 9

  39. Chapter 9

  40. 4 5 6 7 8 3 11 2 9 1 10 Steps in Digital Image Processing Chapter 9

  41. 1 Chapter 9

  42. 2 Chapter 9

  43. Distorted image Restore image 3 Chapter 9

  44. 4 Chapter 9

  45. 5 Chapter 9

  46. 6 Chapter 9

  47. 7 Chapter 9

  48. 8 Chapter 9

  49. 9 Chapter 9

  50. 9 Chapter 9

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