ImageGear21.Processing.Advanced Assembly > ImageGear.FreqIP Namespace > ImGearFrequencyProcessing Class : LowPassFilter Method |
'Declaration Public Shared Sub LowPassFilter( _ ByVal page As ImGearRasterPage, _ ByVal filterBrand As ImGearFreqIPFilterBrands, _ ByVal cutoffFrequency As Double, _ ByVal filterOrder As Integer, _ ByVal rippleFactor As Double _ )
'Usage Dim page As ImGearRasterPage Dim filterBrand As ImGearFreqIPFilterBrands Dim cutoffFrequency As Double Dim filterOrder As Integer Dim rippleFactor As Double ImGearFrequencyProcessing.LowPassFilter(page, filterBrand, cutoffFrequency, filterOrder, rippleFactor)
public static void LowPassFilter( ImGearRasterPage page, ImGearFreqIPFilterBrands filterBrand, double cutoffFrequency, int filterOrder, double rippleFactor )
public: static void LowPassFilter( ImGearRasterPage* page, ImGearFreqIPFilterBrands filterBrand, double cutoffFrequency, int filterOrder, double rippleFactor )
public: static void LowPassFilter( ImGearRasterPage^ page, ImGearFreqIPFilterBrands filterBrand, double cutoffFrequency, int filterOrder, double rippleFactor )
Parameter filterBrand
specifies the brand of filter to use, with available brands being Ideal, Butterworth, Gaussian, Chebyshev I, and Chebyshev II.
Parameter cutoffFrequency
specifies the cutoff frequency for the low-pass filter. This parameter should have value within the range of [0, 1], where 0 is DC and 1 is the Nyquist frequency.
Before using this method, like other frequency processing methods, InitializeFFTW method must be called first to initialize the support for FFTW.
Can be applied only to 8bit grayscale images with one channel.
ImGearFrequencyProcessingVerifier.CanApplyLowPassFilter method can be called to check whether the operation can be performed or not.