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gen_sin_bandpassgen_sin_bandpassGenSinBandpassgen_sin_bandpassGenSinBandpassGenSinBandpass (Operator)


gen_sin_bandpassgen_sin_bandpassGenSinBandpassgen_sin_bandpassGenSinBandpassGenSinBandpass — Generate a bandpass filter with sinusoidal shape.


gen_sin_bandpass( : ImageFilter : Frequency, Norm, Mode, Width, Height : )

Herror gen_sin_bandpass(Hobject* ImageFilter, double Frequency, const char* Norm, const char* Mode, const Hlong Width, const Hlong Height)

Herror T_gen_sin_bandpass(Hobject* ImageFilter, const Htuple Frequency, const Htuple Norm, const Htuple Mode, const Htuple Width, const Htuple Height)

Herror gen_sin_bandpass(Hobject* ImageFilter, const HTuple& Frequency, const HTuple& Norm, const HTuple& Mode, const HTuple& Width, const HTuple& Height)

HImage HImage::GenSinBandpass(const HTuple& Frequency, const HTuple& Norm, const HTuple& Mode, const HTuple& Width, const HTuple& Height)

void GenSinBandpass(HObject* ImageFilter, const HTuple& Frequency, const HTuple& Norm, const HTuple& Mode, const HTuple& Width, const HTuple& Height)

void HImage::GenSinBandpass(double Frequency, const HString& Norm, const HString& Mode, Hlong Width, Hlong Height)

void HImage::GenSinBandpass(double Frequency, const char* Norm, const char* Mode, Hlong Width, Hlong Height)

void HOperatorSetX.GenSinBandpass(
[out] IHUntypedObjectX*ImageFilter, [in] VARIANT Frequency, [in] VARIANT Norm, [in] VARIANT Mode, [in] VARIANT Width, [in] VARIANT Height)

void HImageX.GenSinBandpass(
[in] double Frequency, [in] BSTR Norm, [in] BSTR Mode, [in] Hlong Width, [in] Hlong Height)

static void HOperatorSet.GenSinBandpass(out HObject imageFilter, HTuple frequency, HTuple norm, HTuple mode, HTuple width, HTuple height)

void HImage.GenSinBandpass(double frequency, string norm, string mode, int width, int height)


gen_sin_bandpassgen_sin_bandpassGenSinBandpassgen_sin_bandpassGenSinBandpassGenSinBandpass generates a rotationally invariant bandpass filter with the response being a sinusoidal function in the frequency domain. The maximum of the sine is determined by FrequencyFrequencyFrequencyFrequencyFrequencyfrequency, which is given as a fraction of the maximum (horizontal and vertical) frequency that can be represented in an image of size WidthWidthWidthWidthWidthwidth x HeightHeightHeightHeightHeightheight, i.e., FrequencyFrequencyFrequencyFrequencyFrequencyfrequency should lie between 0 and 1. To achieve a maximum overall efficiency of the filtering operation, the parameter NormNormNormNormNormnorm can be used to specify the normalization factor of the filter. If fft_genericfft_genericFftGenericfft_genericFftGenericFftGeneric and NormNormNormNormNormnorm = 'n'"n""n""n""n""n" is used the normalization in the FFT can be avoided. ModeModeModeModeModemode can be used to determine where the DC term of the filter lies or whether the filter should be used in the real-valued FFT. If fft_genericfft_genericFftGenericfft_genericFftGenericFftGeneric is used, 'dc_edge'"dc_edge""dc_edge""dc_edge""dc_edge""dc_edge" can be used to gain efficiency. If fft_imagefft_imageFftImagefft_imageFftImageFftImage and fft_image_invfft_image_invFftImageInvfft_image_invFftImageInvFftImageInv are used for filtering, NormNormNormNormNormnorm = 'none'"none""none""none""none""none" and ModeModeModeModeModemode = 'dc_center'"dc_center""dc_center""dc_center""dc_center""dc_center" must be used. If rft_genericrft_genericRftGenericrft_genericRftGenericRftGeneric is used, ModeModeModeModeModemode = 'rft'"rft""rft""rft""rft""rft" must be used. The filter is always zero for the DC term, rises with the sine function up to FrequencyFrequencyFrequencyFrequencyFrequencyfrequency, and drops for higher frequencies accordingly. The range of the sine used is from 0 to pi. All other points are set to zero.



ImageFilterImageFilterImageFilterImageFilterImageFilterimageFilter (output_object)  image objectHImageHImageHImageHImageXHobject * (real)

Bandpass filter as image in the frequency domain.

FrequencyFrequencyFrequencyFrequencyFrequencyfrequency (input_control)  real HTupleHTupleHTupleVARIANTHtuple (real) (double) (double) (double) (double) (double)

Distance of the filter's maximum from the DC term.

Default value: 0.1

Suggested values: 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0

Restriction: Frequency >= 0

NormNormNormNormNormnorm (input_control)  string HTupleHTupleHTupleVARIANTHtuple (string) (string) (HString) (char*) (BSTR) (char*)

Normalizing factor of the filter.

Default value: 'none' "none" "none" "none" "none" "none"

List of values: 'n'"n""n""n""n""n", 'none'"none""none""none""none""none"

ModeModeModeModeModemode (input_control)  string HTupleHTupleHTupleVARIANTHtuple (string) (string) (HString) (char*) (BSTR) (char*)

Location of the DC term in the frequency domain.

Default value: 'dc_center' "dc_center" "dc_center" "dc_center" "dc_center" "dc_center"

List of values: 'dc_center'"dc_center""dc_center""dc_center""dc_center""dc_center", 'dc_edge'"dc_edge""dc_edge""dc_edge""dc_edge""dc_edge", 'rft'"rft""rft""rft""rft""rft"

WidthWidthWidthWidthWidthwidth (input_control)  integer HTupleHTupleHTupleVARIANTHtuple (integer) (int / long) (Hlong) (Hlong) (Hlong) (Hlong)

Width of the image (filter).

Default value: 512

List of values: 128, 160, 192, 256, 320, 384, 512, 640, 768, 1024, 2048, 4096, 8192

HeightHeightHeightHeightHeightheight (input_control)  integer HTupleHTupleHTupleVARIANTHtuple (integer) (int / long) (Hlong) (Hlong) (Hlong) (Hlong)

Height of the image (filter).

Default value: 512

List of values: 120, 128, 144, 240, 256, 288, 480, 512, 576, 1024, 2048, 4096, 8192


gen_sin_bandpassgen_sin_bandpassGenSinBandpassgen_sin_bandpassGenSinBandpassGenSinBandpass returns 2 (H_MSG_TRUE) if all parameters are correct. If necessary, an exception is raised.

Possible Predecessors

fft_imagefft_imageFftImagefft_imageFftImageFftImage, fft_genericfft_genericFftGenericfft_genericFftGenericFftGeneric, rft_genericrft_genericRftGenericrft_genericRftGenericRftGeneric

Possible Successors




See also

fft_image_invfft_image_invFftImageInvfft_image_invFftImageInvFftImageInv, gen_gauss_filtergen_gauss_filterGenGaussFiltergen_gauss_filterGenGaussFilterGenGaussFilter, gen_mean_filtergen_mean_filterGenMeanFiltergen_mean_filterGenMeanFilterGenMeanFilter, gen_derivative_filtergen_derivative_filterGenDerivativeFiltergen_derivative_filterGenDerivativeFilterGenDerivativeFilter, gen_bandpassgen_bandpassGenBandpassgen_bandpassGenBandpassGenBandpass, gen_bandfiltergen_bandfilterGenBandfiltergen_bandfilterGenBandfilterGenBandfilter, gen_highpassgen_highpassGenHighpassgen_highpassGenHighpassGenHighpass, gen_lowpassgen_lowpassGenLowpassgen_lowpassGenLowpassGenLowpass



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