1 / 18

Digital Image Processing Chapter 4

Digital Image Processing Chapter 4. Image Enhancement in the Frequency Domain Part II. 2D-DFT (Frequency) Domain Filtering. Convolution Theorem. f ( x,y ). g ( x,y ). h ( x,y ). input image. impulse response (filter). output image. DFT. IDFT. DFT. IDFT. DFT. IDFT. G ( u,v ). =.

nodin
Download Presentation

Digital Image Processing Chapter 4

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. Digital Image ProcessingChapter 4 Image Enhancement in the Frequency Domain Part II

  2. 2D-DFT (Frequency) Domain Filtering

  3. Convolution Theorem f (x,y) g(x,y) h(x,y) input image impulse response (filter) output image DFT IDFT DFT IDFT DFT IDFT G(u,v) = F(u,v) H(u,v)

  4. Frequency Domain Filtering Filter design: design H(u,v)

  5. 2D-DFT Domain Filter Design • Ideal lowpass, bandpass and highpass

  6. 2D-DFT Domain Filter Design • Ideal lowpass, bandpass and highpass

  7. 2D-DFT Domain Filter Design Ideal lowpass filtering with cutoff frequencies set at radii values of 5, 15, 30, 80, and 230, respectively

  8. 2D-DFT Domain Filter Design • Gaussian lowpass

  9. 2D-DFT Domain Filter Design Effect of Gaussian lowpass filter

  10. 2D-DFT Domain Filter Design Effect of Gaussian lowpass filter

  11. 2D-DFT Domain Filter Design Effect of Gaussian lowpass filter

  12. 2D-DFT Domain Filter Design Gaussian lowpass filtering Gaussian highpass filtering

  13. 2D-DFT Domain Filter Design • Choices of highpass filters Butterworth Gaussian Ideal

  14. 2D-DFT Domain Filter Design Ideal Butterworth Gaussian Obtained by applying inverse 2D-DFT to the corresponding frequency domain filters

  15. 2D-DFT Domain Filter Design Ideal Butterworth Gaussian

  16. 2D-DFT Domain Filter Design Gaussian filter with different width

  17. 2D-DFT Domain Filter Design • Orientation selective filters

  18. 2D-DFT Domain Filter Design • Narrowband Filtering by combining radial and orientation selection *

More Related