Module ij

Package ij.plugin.filter

Class FFTFilter

java.lang.Object

ij.plugin.filter.FFTFilter

All Implemented Interfaces:

Measurements, PlugInFilter

public class FFTFilter
extends java.lang.Object
implements PlugInFilter, Measurements

This class implements the Process/FFT/Bandpass Filter command. It is based on Joachim Walter's FFT Filter plugin at "http://imagej.nih.gov/ij/plugins/fft-filter.html". 2001/10/29: First Version (JW) 2003/02/06: 1st bugfix (works in macros/plugins, works on stacks, overwrites image(=>filter)) (JW) 2003/07/03: integrated into ImageJ, added "Display Filter" option (WSR) 2007/03/26: 2nd bugfix (Fixed incorrect calculation of filter from structure sizes, which caused the real structure sizes to be wrong by a factor of 0.75 to 1.5 depending on the image size.)

Field Summary

Fields inherited from interface ij.measure.Measurements

ADD_TO_OVERLAY, ALL_STATS, AREA, AREA_FRACTION, CENTER_OF_MASS, CENTROID, CIRCULARITY, ELLIPSE, FERET, INTEGRATED_DENSITY, INVERT_Y, KURTOSIS, LABELS, LIMIT, MAX_STANDARDS, MEAN, MEDIAN, MIN_MAX, MODE, NaN_EMPTY_CELLS, PERIMETER, RECT, SCIENTIFIC_NOTATION, SHAPE_DESCRIPTORS, SKEWNESS, SLICE, STACK_POSITION, STD_DEV

Fields inherited from interface ij.plugin.filter.PlugInFilter

CONVERT_TO_FLOAT, DOES_16, DOES_32, DOES_8C, DOES_8G, DOES_ALL, DOES_RGB, DOES_STACKS, DONE, FINAL_PROCESSING, KEEP_THRESHOLD, NO_CHANGES, NO_IMAGE_REQUIRED, NO_UNDO, NO_UNDO_RESET, PARALLELIZE_IMAGES, PARALLELIZE_STACKS, ROI_REQUIRED, SNAPSHOT, STACK_REQUIRED, SUPPORTS_MASKING

Constructor Summary

Constructors

Constructor	Description
FFTFilter()

Method Summary

Modifier and Type	Method	Description
void	run(ImageProcessor ip)	Filters use this method to process the image.
int	setup(java.lang.String arg, ImagePlus imp)	This method is called once when the filter is loaded.
ImageProcessor	tileMirror(ImageProcessor ip, int width, int height, int x, int y)	Puts ImageProcessor (ROI) into a new ImageProcessor of size width x height y at position (x,y).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FFTFilter

public FFTFilter()

Method Detail

setup

public int setup(java.lang.String arg,
                 ImagePlus imp)

Description copied from interface: PlugInFilter

This method is called once when the filter is loaded. 'arg', which may be blank, is the argument specified for this plugin in IJ_Props.txt or in the plugins.config file of a jar archive containing the plugin. 'imp' is the currently active image. This method should return a flag word that specifies the filters capabilities.

For Plugin-filters specifying the PlugInFilter.FINAL_PROCESSING flag, the setup method will be called again, this time with arg = "final" after all other processing is done.

Specified by:

setup in interface PlugInFilter

run

public void run(ImageProcessor ip)

Description copied from interface: PlugInFilter

Filters use this method to process the image. If the PlugInFilter.DOES_STACKS flag was set, it is called for each slice in a stack. With PlugInFilter.CONVERT_TO_FLOAT, the filter is called with the image data converted to a FloatProcessor (3 times per image for RGB images). ImageJ will lock the image before calling this method and unlock it when the filter is finished. For PlugInFilters specifying the PlugInFilter.NO_IMAGE_REQUIRED flag and not the PlugInFilter.DONE flag, run(ip) is called once with the argument null.

Specified by:

run in interface PlugInFilter

tileMirror

public ImageProcessor tileMirror(ImageProcessor ip,
                                 int width,
                                 int height,
                                 int x,
                                 int y)

Puts ImageProcessor (ROI) into a new ImageProcessor of size width x height y at position (x,y). The image is mirrored around its edges to avoid wrap around effects of the FFT.