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Digital Image Processing

Digital Image Processing. Tania Stathaki Location: Room 812 Extension: 46229 Email: t.stathaki@ic.ac.uk. LOGISTICS OF THE COURSE. Duration 20 lectures Assessment 100% exam There isn't any coursework or homework. IMAGE PROCESSING. Textbook

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Digital Image Processing

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  1. Digital Image Processing Tania Stathaki Location: Room 812 Extension: 46229 Email: t.stathaki@ic.ac.uk

  2. LOGISTICS OF THE COURSE • Duration • 20 lectures • Assessment • 100% exam • There isn't any coursework or homework

  3. IMAGE PROCESSING • Textbook – R. C. Gonzalez, R. E. Woods, Digital Image Processing, Addison Wesley, 1993, ISBN 0-201-50803-6

  4. DIGITAL IMAGE

  5. DIGITAL IMAGE

  6. Digital storage (disk) Imaging systems Sample and quantize Digital computer On-line buffer output Display object observe digitize store process Refresh/store Record FROM ANALOG TO DIGITAL

  7. Sampling 256x256 64x64

  8. 0 255 255 0 0 0 0 255 0 0 0 0 255 0 0 0 0 255 0 0 0 255 255 255 0 Quantisation – 8 bits

  9. Quantisation cont. 256x256 256 levels 256x256 32 levels

  10. Quantisation cont. 256x256 256 levels 256x256 2 levels

  11. Coloured Image

  12. Intensity (Gray-Level) Image

  13. Binary Image

  14. Image Processing • manipulation of multidimensional signals image (photo) video CT, MRI

  15. Image Processing • Why? – Coding/compression – Enhancement, restoration, reconstruction – Analysis, detection, recognition, understanding – Visualization

  16. Part I: Image Transforms Original Image Fourier Transform Amplitude Phase

  17. Part II: Image Enhancement Original Image High Pass Filtering

  18. Part III: Image Restoration Distorted Image Restored Image

  19. Distortion due to Camera Misfocus Original image Distorted image

  20. Distortion due to Camera Misfocus Camera lens

  21. Distortion due to motion Camera lens

  22. Distortion due to Random Noise Original image Distorted image

  23. Part IV: Image Compression • Signal-Processing Based: Encoder Compressed Representation H Decoder

  24. Images are not directly amenable to computer analysis • Computers work with numerical (rather than pictorial) data. • An image must be converted to numerical form before processing by computer can commence. • Picture elements or pixels • Rectangular sampling grid • Brightness of the image

  25. Images are not directly amenable to computer analysis

  26. APPLICATIONS • Medical images • Satellite images • Astronomy • Radar images

  27. Satellite imageVolcano Kamchatka Peninsula, Russia

  28. Satellite imageVolcano in Alaska

  29. Medical Images:MRI of normal brain

  30. Medical Images:X-ray knee

  31. Medical Images: UltrasoundFive-month Foetus (lungs, liver and bowel)

  32. Astronomical images

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