Amplitude spectrum manipulator

Detail

Language

English

Title

Amplitude spectrum manipulator

Free Keywords

Matlab, FFT, Fourier Tansform, Spatial Frequency, Natural Image

Description

Last Modified Date

Feb 28, 2008 20:32:02

Created Date

Feb 28, 2008 20:17:58

Contributor

Shigeki NAKAUCHI (nakauchi)

Item Type

Model

Change Log(History)

Feb 28, 2008

Modified; Model file.

Model type

Matlab

Creator

Shigeki Nakauchi

Preview

Online Simulation

Model file

one_over_f_GUI.zip

Type	: application/x-zip
Size	: 678.1 KB
Last updated	: Feb 28, 2008
Downloads	: 421

Total downloads since Feb 28, 2008 : 421

Readme

one_over_f
 This MATLAB GUI plots and manipulates the ampulitude spectrum of an image.

Zip file contents: one_over_f.fig, one_over_f.m, one_over_f_graph.m, eo_polaraverage.m

Installation instructions:
 Once you have downloaded the one_over_f_GUI.zip, move it to an appropriate directory (in your matlabpath) and decompress it (you already did it because you can read this file!). 

Uninstallation instructions:
 Delete decompressed folder.

MATLAB Release: R2007b


Description
 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.

Rights

This work is licensed under a Creative Commons Attribution-NonCommercial 2.5 License.

Index

/ Public / Model

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