1. Dr. Nikos Desypris, ndessipris@yahoo.com Oct. 2017 Lecture 2
Digital Television
Dr. Nikos Desypris,
Oct. 2017
Lecture 2

2. (sampling and quantisation - lossy)
DTV Block Diagram
Scene
Receiver
Decompression
CAMERA
Analogue sensor +
A/D converter
(sampling and quantisation - lossy)
D/A converter
Video adapter
TRANSMISSION
(Terrestrial,
Sattelite, Cable,
IPTV)
Compression (lossy)
Human Observer

3. Course Outline Image Processing Description of the human Visual System
Limitations of the human Visual System
The Electromagnetic Spectrum
Imaging Sensors
Sampling and Quantization

4. Indicative References
Digital image Processing Third Edition R.C. Gonzalez, R.E. Woods, Pearson 2010.
From Mars to Hollywood with a stop at the hospital (Guillermo Sapiro coursera.org)
Click to edit certification nameFundamentals of Digital Image and Video Processing (by Aggelos Katsaggelos, coursera.org)
Two dimensional Signal and Image Processing, J. S. Lim, Prentice Hall 1990

5. Digital Image Processing

6. Digital Image Processing

7. Digital Image Processing

8. The Human Eye

9. The Human Eye Cornea Κερατοειδής χιτών Vitreous humor Υαλοειδές υγρό
Iris
Ίριδα
Retina
Αμφιβληστροειδής χιτώνας
Anterior chamber
Πρόσθιος θάλαμος
Blind spot
Τυφλό σημείο
Ciliary body
Ακτινωτό Σώμα
Fovea
Βοθρίο
Lens
Φακός
Sclera
Σκληρός χιτώνας
Ciliary muscle
Ακτινωτός Μυς
Choroid
Χοριοειδής
Ciliary fibres
Ακτινωτές Ίνες
Nerve and Sheath
Νεύρο και Θήκη
Visual axis
Οπτικός άξονας
Cones (6-7 Mil.)
Rods ( Mil.)

10. The Human Visual System

11. The Human Visual System
For comparison purposes, the basic ability of the eye to resolve detail is comparable to current electronic imaging sensors

12. Image formation in the Eye

13. Reversing goggles

14. The Human Visual System

15. The Human Visual System

16. The Human Visual System

17. Why & how cinema works
If a human is presented with a rapid sequence of images, he/she is confused that it is a smooth sequence, when the speed is > 16 frames /sec. (

18. Grey Levels humans can see
Eye discrimination range for image intensity differences (106 photopic,
104 scotopic)

19. Grey Levels humans can see

20. Grey Levels humans can see (32)

21. Grey Levels humans can see (64)

22. The Mach Band Effect

23. The Mach Band Effect

24. Simultanenous contrast

25. Simultaneous contrast

26. Filtering effect of human eye

27. Optical Illusions

28. Light and the EM Spectrum

29. Light and the EM Spectrum

30. Light and the EM Spectrum

31. Light and the EM Spectrum
Advanced Light Source

32. Light and the EM Spectrum

33. Types of imaging sensors

34. Colour imaging sensor

35. 3 Colour Digital Video Camera

36. 3 CCD Digital Video Camera
3CCD Philips prism

37. Drum scanner

38. Image Formation Model

39. Sampling &Quantization

40. Result of Sampling & Quantization

41. Presentations of an image

42. Image Noise and Saturation

43. Bits per image NxN pels; k:bits/level

44. Spatial Resolution

45. Intensity Resolution

46. Point Image Transformations

47. Point Image Transformations

48. Point Image Transformations