User:KCote/sandbox: Difference between revisions

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Latest revision as of 19:31, 30 April 2017

This is the user sandbox of KCote. A user sandbox is a subpage of the user's user page. It serves as a testing spot and page development space for the user and is not an encyclopedia article. Create or edit your own sandbox here.

Other sandboxes: Main sandbox | Template sandbox

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Filter type	Kernel or mask	Example
Original Image	${\begin{bmatrix}0&0&0\\0&1&0\\0&0&0\end{bmatrix}}$
Spatial Lowpass	${\frac {1}{9}}\times {\begin{bmatrix}1&1&1\\1&1&1\\1&1&1\end{bmatrix}}$
Spatial Highpass	${\begin{bmatrix}0&-1&0\\-1&4&-1\\0&-1&0\end{bmatrix}}$
Fourier Representation	Pseudo-code: image = checkerboard F = Fourier Transform of image Show Image: log(1+Absolute Value(F))
Fourier Lowpass
Fourier Highpass

References

Berger, Marcel (1987), Geometry I, Berlin: Springer, ISBN 3-540-11658-3

@@ Line 41: / Line 41: @@
 |-
 | '''[[Fast Fourier transform|Fourier Representation]]'''
+| Pseudo-code:
-| MATLAB Script:
-img=checkerboard(size);
+image = checkerboard
+F = Fourier Transform of image
-F=fft2(img);
+Show Image: log(1+Absolute Value(F))
-F=fftshift(F);
-imshow(log(1+abs(F)))
 | align="center"| [[File:Fourier Space Checkerboard.png]]
 |-
 | '''Fourier Lowpass'''
-| [[File:Lowpass_Butterworth_Checkerboard.png]]
+| align="center"| [[File:Lowpass_Butterworth_Checkerboard.png]]
-| [[File:Lowpass_FFT_Filtered_checkerboard.png]]
+| align="center"| [[File:Lowpass_FFT_Filtered_checkerboard.png]]
 |-
 | '''Fourier Highpass'''
-| [[File:Highpass_Butterworth_Checkerboard.png]]
+| align="center"| [[File:Highpass_Butterworth_Checkerboard.png]]
-| [[File:Highpass_FFT_Filtered_checkerboard.png]]
+| align="center"| [[File:Highpass_FFT_Filtered_checkerboard.png]]
 |-
 |}