1 / 45

Chapter 4 Image Enhancement in the Frequency Domain

Chapter 4 Image Enhancement in the Frequency Domain. Chapter 4 Image Enhancement in the Frequency Domain. Chapter 4 Image Enhancement in the Frequency Domain. MATLAB/Image Processing Toolbox. MATLAB Fourier transforms >> f=imread(‘Figure_Rectangle.jpg’); % load in spatial rectangle

flavio
Download Presentation

Chapter 4 Image Enhancement in the Frequency Domain

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related