ImageGear Professional for Windows ActiveX
BandPassFilter Method
| ImageGear Professional v18.2 > API Reference Guide > FreqIP Component API Reference > FreqIP Component Objects > IGFreqIPCtl Control > IGFreqIPCtl Methods > BandPassFilter Method |
Filters the input image using a band-pass filter, with the specified parameters.
Parameter nFilterBrand specifies the brand of filter to use, with available brands being Ideal, Butterworth, Gaussian, Chebyshev I, and Chebyshev II.
Parameters dCutoffFreqLowand dCutoffFreqHigh specify the lower and upper cutoff frequencies for the band-pass filter. The parameters should have values within the range of [0, 1], where 0 is DC and 1 is the Nyquist frequency.
This method takes into account the ROI settings of pPage object, that are accessible via the IGPage Object.ROI property. By default ROI is set to the entire image.
BandPassFilter(pPage As IGPage, nFilterBrand As
enumIGFreqIPFilterBrands, dCutoffFreqLow As double,
dCutoffFreqHigh As double, nFilterOrder As long, dRippleFactor
As double)
| Name | Description |
|---|---|
| pPage | IGPage Object to be filtered |
| nFilterBrand | Brand of the filter to use. |
| dCutoffFreqLow | Lower cutoff frequency for the band-pass filter |
| dCutoffFreqHigh | Higher cutoff frequency for the band-pass filter |
| nFilterOrder | Filter order to use, applicable to all except Ideal filter |
| dRippleFactor | A factor which determines the pass-band ripple for Chebyshev filters, with value between [0, 1]. |
None
8bit grayscale images with one channel
FreqIP