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Chapter 4 Image Enhancement in the Frequency Domain PowerPoint Presentation
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Chapter 4 Image Enhancement in the Frequency Domain

Chapter 4 Image Enhancement in the Frequency Domain

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Chapter 4 Image Enhancement in the Frequency Domain

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  1. Chapter 4 Image Enhancement in the Frequency Domain

  2. Chapter 4 Image Enhancement in the Frequency Domain

  3. Chapter 4 Image Enhancement in the Frequency Domain

  4. MATLAB/Image Processing Toolbox MATLAB Fourier transforms >> f=imread(‘Figure_Rectangle.jpg’); % load in spatial rectangle >> F=fft2(f); % do 2D FFT >> S=abs(F); % determine magnitude for display >> imshow(S, [ ]) % shows in four corners of display >> Fc=fftshift(F); % shift FFT to center >> imshow(abs(Fc), [ ]); % show magnitude of FFT in center % much tougher to do display transform >> g=im2unit8(mat2gray(log(1+double(f)))); >> imshow(g) % double converts the image to double precision floating point % mat2gray brings the values to the range [0,1] % im2unit8 brings the values back to the range [0,255] % general log transform >> g=im2unit8(mat2gray(c*log(1+double(f)))); SEE GWE, Section 4.2 Computing and Visualizing the 2-D DFT in MATLAB GWE, Section 3.2.2 Logarithmic and Contrast Stretching Transformations

  5. Chapter 4 Image Enhancement in the Frequency Domain

  6. Chapter 4 Image Enhancement in the Frequency Domain

  7. Chapter 4 Image Enhancement in the Frequency Domain

  8. Chapter 4 Image Enhancement in the Frequency Domain

  9. Chapter 4 Image Enhancement in the Frequency Domain

  10. Chapter 4 Image Enhancement in the Frequency Domain

  11. Chapter 4 Image Enhancement in the Frequency Domain

  12. Chapter 4 Image Enhancement in the Frequency Domain

  13. Chapter 4 Image Enhancement in the Frequency Domain

  14. Chapter 4 Image Enhancement in the Frequency Domain

  15. Chapter 4 Image Enhancement in the Frequency Domain

  16. Chapter 4 Image Enhancement in the Frequency Domain

  17. Chapter 4 Image Enhancement in the Frequency Domain

  18. Chapter 4 Image Enhancement in the Frequency Domain

  19. Chapter 4 Image Enhancement in the Frequency Domain

  20. Chapter 4 Image Enhancement in the Frequency Domain

  21. Chapter 4 Image Enhancement in the Frequency Domain

  22. Chapter 4 Image Enhancement in the Frequency Domain

  23. Chapter 4 Image Enhancement in the Frequency Domain

  24. Chapter 4 Image Enhancement in the Frequency Domain

  25. Chapter 4 Image Enhancement in the Frequency Domain

  26. Chapter 4 Image Enhancement in the Frequency Domain

  27. Chapter 4 Image Enhancement in the Frequency Domain

  28. Chapter 4 Image Enhancement in the Frequency Domain

  29. Chapter 4 Image Enhancement in the Frequency Domain

  30. Chapter 4 Image Enhancement in the Frequency Domain

  31. Chapter 4 Image Enhancement in the Frequency Domain

  32. Chapter 4 Image Enhancement in the Frequency Domain

  33. Chapter 4 Image Enhancement in the Frequency Domain

  34. Chapter 4 Image Enhancement in the Frequency Domain

  35. Chapter 4 Image Enhancement in the Frequency Domain

  36. Chapter 4 Image Enhancement in the Frequency Domain

  37. Chapter 4 Image Enhancement in the Frequency Domain

  38. Chapter 4 Image Enhancement in the Frequency Domain

  39. Chapter 4 Image Enhancement in the Frequency Domain

  40. Chapter 4 Image Enhancement in the Frequency Domain

  41. Chapter 4 Image Enhancement in the Frequency Domain

  42. Chapter 4 Image Enhancement in the Frequency Domain

  43. Chapter 4 Image Enhancement in the Frequency Domain

  44. Chapter 4 Image Enhancement in the Frequency Domain

  45. Chapter 4 Image Enhancement in the Frequency Domain