Fft.Filter Class Reference

Creation functions for FFT filters. More...

Static Public Member Functions
static FftImage	CreateBandStop (FftImage img, float center1, float center2)
	Create a Fourier space representation of a band stop filter with a default width of 10%. More...
static FftImage	CreateBandStop (FftImage img, float center1, float center2, float width)
	Create a Fourier space representation of a band stop filter. More...
static FftImage	CreateBandPass (FftImage img, float center1, float center2)
	Create a Fourier space representation of a band pass filter. More...
static FftImage	CreateBandPass (FftImage img, float center1, float center2, float width)
	Create a Fourier space representation of a band pass filter. More...
static FftImage	CreateHighPass (FftImage img, float center)
	Create a Fourier space representation of a high pass filter. More...
static FftImage	CreateHighPass (FftImage img, float center, float width)
	Create a Fourier space representation of a high pass filter. More...
static FftImage	CreateLowPass (FftImage img, float center)
	Create a Fourier space representation of a low pass filter. More...
static FftImage	CreateLowPass (FftImage img, float center, float width)
	Create a Fourier space representation of a low pass filter. More...

Detailed Description

Creation functions for FFT filters.

Member Function Documentation

CreateBandPass() [1/2]

static FftImage CreateBandPass ( FftImage  img, float  center1, float  center2  )

static

Create a Fourier space representation of a band pass filter.

Such a filter can be applied to an image by multiplying the image's Fourier transform with this filter image and then transforming the result back to Cartesian space.

Parameters

img	Image to apply the filter on.This input image will not directly be processed - it is required to determine the necessary size of the result image only.
center1	Lower cutoff position of the filter relative to the frequency range (range [0...1]).
center2	Upper cutoff position of the filter relative to the frequency range (range [0...1]).

Returns

Filter's Fourier representation

Exceptions

ArgumentNullException	If the input img is null
ObjectDisposedException	If the input img has already been disposed

CreateBandPass() [2/2]

static FftImage CreateBandPass ( FftImage  img, float  center1, float  center2, float  width  )

static

Create a Fourier space representation of a band pass filter.

Such a filter can be applied to an image by multiplying the image's Fourier transform with this filter image and then transforming the result back to Cartesian space.

Parameters

img	Image to apply the filter on.This input image will not directly be processed - it is required to determine the necessary size of the result image only.
center1	Lower cutoff position of the filter relative to the frequency range (range [0...1]).
center2	Upper cutoff position of the filter relative to the frequency range (range [0...1]).
width	Width of the filter cutoff region (range [0...1]). Helps to reduce ring artifacts.

Returns

Filter's Fourier representation

Exceptions

ArgumentNullException	If the input img is null
ObjectDisposedException	If the input img has already been disposed

CreateBandStop() [1/2]

static FftImage CreateBandStop ( FftImage  img, float  center1, float  center2  )

static

Create a Fourier space representation of a band stop filter with a default width of 10%.

Such a filter can be applied to an image by multiplying the image's Fourier transform with this filter image and then transforming the result back to Cartesian space.

Parameters

img	Image to apply the filter on.This input image will not directly be processed - it is required to determine the necessary size of the result image only.
center1	Lower cutoff position of the filter relative to the frequency range (range [0...1]).
center2	Upper cutoff position of the filter relative to the frequency range (range [0...1]).

Returns

Filter's Fourier representation

Exceptions

ArgumentNullException	If the input img is null
ObjectDisposedException	If the input img has already been disposed

CreateBandStop() [2/2]

static FftImage CreateBandStop ( FftImage  img, float  center1, float  center2, float  width  )

static

Create a Fourier space representation of a band stop filter.

Such a filter can be applied to an image by multiplying the image's Fourier transform with this filter image and then transforming the result back to Cartesian space.

Parameters

img	Image to apply the filter on.This input image will not directly be processed - it is required to determine the necessary size of the result image only.
center1	Lower cutoff position of the filter relative to the frequency range (range [0...1]).
center2	Upper cutoff position of the filter relative to the frequency range (range [0...1]).
width	Width of the filter cutoff region (range [0...1]). Helps to reduce ring artifacts.

Returns

Filter's Fourier representation

Exceptions

ArgumentNullException	If the input img is null
ObjectDisposedException	If the input img has already been disposed

CreateHighPass() [1/2]

static FftImage CreateHighPass ( FftImage  img, float  center  )

static

Create a Fourier space representation of a high pass filter.

Such a filter can be applied to an image by multiplying the image's Fourier transform with this filter image and then transforming the result back to Cartesian space.

Parameters

img	Image to apply the filter on.This input image will not directly be processed - it is required to determine the necessary size of the result image only.
center	Cutoff position of the filter relative to the frequency range (range [0...1]).

Returns

Filter's Fourier representation

Exceptions

ArgumentNullException	If the input img is null
ObjectDisposedException	If the input img has already been disposed

CreateHighPass() [2/2]

static FftImage CreateHighPass ( FftImage  img, float  center, float  width  )

static

Create a Fourier space representation of a high pass filter.

Such a filter can be applied to an image by multiplying the image's Fourier transform with this filter image and then transforming the result back to Cartesian space.

Parameters

img	Image to apply the filter on.This input image will not directly be processed - it is required to determine the necessary size of the result image only.
center	Cutoff position of the filter relative to the frequency range (range [0...1]).
width	Width of the filter cutoff region (range [0...1]). Helps to reduce ring artifacts.

Returns

Filter's Fourier representation

Exceptions

ArgumentNullException	If the input img is null
ObjectDisposedException	If the input img has already been disposed

CreateLowPass() [1/2]

static FftImage CreateLowPass ( FftImage  img, float  center  )

static

Create a Fourier space representation of a low pass filter.

Such a filter can be applied to an image by multiplying the image's Fourier transform with this filter image and then transforming the result back to Cartesian space.

Parameters

img	Image to apply the filter on.This input image will not directly be processed - it is required to determine the necessary size of the result image only.
center	Cutoff position of the filter relative to the frequency range (range [0...1]).

Returns

Filter's Fourier representation

Exceptions

ArgumentNullException	If the input img is null
ObjectDisposedException	If the input img has already been disposed

CreateLowPass() [2/2]

static FftImage CreateLowPass ( FftImage  img, float  center, float  width  )

static

Create a Fourier space representation of a low pass filter.

Such a filter can be applied to an image by multiplying the image's Fourier transform with this filter image and then transforming the result back to Cartesian space.

Parameters

img	Image to apply the filter on.This input image will not directly be processed - it is required to determine the necessary size of the result image only.
center	Cutoff position of the filter relative to the frequency range (range [0...1]).
width	Width of the filter cutoff region (range [0...1]). Helps to reduce ring artifacts.

Returns

Filter's Fourier representation

Exceptions

ArgumentNullException	If the input img is null
ObjectDisposedException	If the input img has already been disposed