Amplitude spectrum manipulator


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登録者:NIJC管理者 (nijcadmin)  |  作成日: Mar 16, 2011 14:16:45  |  来訪者数:4184  |  実行回数:160
フリーキーワード: Matlab, FFT, Fourier Tansform, Spatial Frequency, Natural Image
ID 47
タイトル Amplitude spectrum manipulator
フリーキーワード Matlab, FFT, Fourier Tansform, Spatial Frequency, Natural Image
概要 This MATLAB GUI plots and manipulates the ampulitude spectrum of an image.

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.
最終更新日 Mar 21, 2013 16:15:58
作成日 Mar 16, 2011 14:16:45
登録者 NIJC管理者 (nijcadmin)
アイテムタイプ Online Simulation
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.
登録PF・DB Visiome Platform
シミュレータ MATLAB
/ Public / Title / A-E

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