Description
Performs a High-pass filter on a FFT image.
-
Return Type
-
A McImage object.
Depending on its input, this method returns either the filtered Amplitude (input is Amplitude or Phase) or the FFT data image itself (input is the FFT data image).
-
Syntax
-
object.HighPass (CFx, CFy, [PreserveNil], [vSourceImg])
The HighPass Method syntax has these parts: |
| object | An expression evaluating to an object of type McFFT. | | CFx | Required. A Double value. Horizontal cutting frequency.
| | CFy | Required. A Double value. Vertical cutting frequency.
| | PreserveNil | Optional. A Boolean value. Preserves the amplitude of the zero-frequency component.
| | vSourceImg | Optional. A Variant value. Optional input image, applies to parent if empty.
|
Remarks
The effect of this filter is to attenuate or filter out (depending on FilterTransition) the frequencies comprised in the region defined by CFx and CFy and FilterShape. This is a centered filter as opposed to SpikeCut and SpikeBoost.
The input (parent image or vSourceImg) can be a mciComplex FFT data image, or a mciPolar image as returned by Forward.
If PreserveNil is true, it preserves the amplitude of the zero-frequency component. This has the effect of preserving the average intensity of the image, which otherwise would be set to 0.
|
HighPass Method (McFFT)
