This LowPassFilter Method filters the image using a low-pass filter.

Available filter brands include Ideal, Butterworth, Gaussian, Chebyshev I, and Chebyshev II.

Before using this method, like other frequency processing methods, ImGearFrequencyProcessing.InitializeFFTW Method() must be called first to enable the support for FFTW.

Can be applied only to 8-bit grayscale images with one channel.

ImGearFrequencyProcessingVerifier.CanApplyLowPassFilter Method can be called to check whether the operation can be performed or not.