Amplitude spectrum manipulator

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Contributor:NIJC Administrator (nijcadmin)  |  Created Date: Mar 16, 2011 14:16:45  |  Visits:2641  |  Runs:143
Free Keywords: Matlab, FFT, Fourier Tansform, Spatial Frequency, Natural Image
ID 47
Title Amplitude spectrum manipulator
Free Keywords Matlab, FFT, Fourier Tansform, Spatial Frequency, Natural Image
Description This MATLAB GUI plots and manipulates the ampulitude spectrum of an image.

Type
one_over_f
to run a GUI window.

Press "Load image" button to open the image file.
Supported formats are BMP, GIF, JPEG and PNG file.
When an image is read, the necessary region is calculated and shown at another window.
The necessary region is 2^m x 2^m pixels. m is the greatest integer and computed on each images.
The luminance image of the region and 2-dimensional Fourier transformed amplitude spectrum is presented.
The averaged amplitude spectrum is shown on log-log coordinate.
It is calculated in every frequency average of 2-dimensional Fourier transformed image.
Alpha is the slope of the amplitude spectrum and displayed at bottom left on the graph.
Alpha of the natural image equals -1.

Press "Generate" button to generate the manipulated image.
The new image is achieved by multiplying the original spectrum by a factor of f^-n, where n is equal to the value in text box.
The value is allowed from -2.0 to 0.0.
Move the slider or type the new value to change the value in text box.
When the "Generate" button is pressed, The manipulated image, 2-dimensional amplitude spectrum and the averaged amplitude spectrum are shown.

Press "Save manipulated image" button to save the manipulated image.
Last Modified Date Mar 21, 2013 16:15:58
Created Date Mar 16, 2011 14:16:45
Contributor NIJC Administrator (nijcadmin)
Item Type Online Simulation
Change Log(History)
Mar 21, 2013 Modified; Contents URL.
Aug 18, 2011 Modified; Description.
Aug 18, 2011 Modified; Description.
Mar 24, 2011 Modified; Index.
Mar 23, 2011 Modified; Preview, Simulator.
Model Contents URL https://visiome.neuroinf.jp/modules/xoonips/detail.php?item_id=6110
Hits:5
Model Site Name Visiome Platform
Simulator Name MATLAB
Simulator Version
Index
/ Public / Title / A-E


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