ImageGear .NET v25.2 - Updated
ImageGear.Processing.Advanced Assembly / ImageGear.FreqIP Namespace / ImGearFrequencyProcessing Class / ForwardFFTFromImage Method
ImageGear.Core.ImGearPage class object to be processed.
Specifies the method of scaling the result data.
Flag to indicate whether to use centered transform.




In This Topic
    ForwardFFTFromImage Method
    In This Topic
    Performs a forward Fast Fourier Transform of the input image.
    Syntax
    'Declaration
     
    Public Shared Function ForwardFFTFromImage( _
       ByVal page As ImGearPage, _
       ByVal scalingMethod As ImGearFFTScalingMethods, _
       ByVal useCenteredTransform As Boolean _
    ) As ImGearComplexObject
    'Usage
     
    Dim page As ImGearPage
    Dim scalingMethod As ImGearFFTScalingMethods
    Dim useCenteredTransform As Boolean
    Dim value As ImGearComplexObject
     
    value = ImGearFrequencyProcessing.ForwardFFTFromImage(page, scalingMethod, useCenteredTransform)
    public static ImGearComplexObject ForwardFFTFromImage( 
       ImGearPage page,
       ImGearFFTScalingMethods scalingMethod,
       bool useCenteredTransform
    )
    public: static ImGearComplexObject* ForwardFFTFromImage( 
       ImGearPage* page,
       ImGearFFTScalingMethods scalingMethod,
       bool useCenteredTransform
    ) 
    public:
    static ImGearComplexObject^ ForwardFFTFromImage( 
       ImGearPage^ page,
       ImGearFFTScalingMethods scalingMethod,
       bool useCenteredTransform
    ) 

    Parameters

    page
    ImageGear.Core.ImGearPage class object to be processed.
    scalingMethod
    Specifies the method of scaling the result data.
    useCenteredTransform
    Flag to indicate whether to use centered transform.

    Return Value

    Remarks
    This method performs a forward Fast Fourier Transform of the input image. The difference between this method and ForwardFFT method is that this one takes an ImageGear.Core.ImGearPage class as the input object.

    Note that the user must keep track how the transform is centered in the forward FFT in order to know how to de-center it during the inverse FFT, same goes for the scaling method.

    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 8, 16, or 32bit grayscale images with one channel.

    ImGearFrequencyProcessingVerifier.CanApplyForwardFFTFromImage method can be called to check whether the operation can be performed or not.

    See Also