ImageDev

ComplexFftInverse

Computes the Fast Fourier inverse Transform of an image.

Access to parameter description

For an introduction: see section Frequency Domain.

This algorithm computes the inverse FFT of an image. The result is two floating point images, respectively the real and imaginary parts of the complex inverse Fourier Transform.

Remarks See also

Function Syntax

This function returns a ComplexFftInverseOutput structure containing the outputRealImage and outputImaginaryImage output parameters.
// Output structure.
struct ComplexFftInverseOutput
{
    std::shared_ptr< iolink::ImageView > outputRealImage;
    std::shared_ptr< iolink::ImageView > outputImaginaryImage;
};

// Function prototype.
ComplexFftInverseOutput
complexFftInverse( std::shared_ptr< iolink::ImageView > inputRealImage,
                   std::shared_ptr< iolink::ImageView > inputImaginaryImage,
                   std::shared_ptr< iolink::ImageView > outputRealImage = NULL,
                   std::shared_ptr< iolink::ImageView > outputImaginaryImage = NULL );
This function returns a tuple containing the output_real_image and output_imaginary_image output parameters.
// Function prototype.
complex_fft_inverse( input_real_image,
                     input_imaginary_image,
                     output_real_image = None,
                     output_imaginary_image = None )
This function returns a ComplexFftInverseOutput structure containing the outputRealImage and outputImaginaryImage output parameters.
/// Output structure of the ComplexFftInverse function.
public struct ComplexFftInverseOutput
{
    public IOLink.ImageView outputRealImage;
    public IOLink.ImageView outputImaginaryImage;
};

// Function prototype.
public static ComplexFftInverseOutput
ComplexFftInverse( IOLink.ImageView inputRealImage,
                   IOLink.ImageView inputImaginaryImage,
                   IOLink.ImageView outputRealImage = null,
                   IOLink.ImageView outputImaginaryImage = null );

Class Syntax

Parameters

Class Name ComplexFftInverse

Parameter Name Description Type Supported Values Default Value
input
inputRealImage
The real part input image. It must be a floating point image. Image Grayscale or Multispectral nullptr
input
inputImaginaryImage
The imaginary part input image. This image must have same dimensions and data type as the real input image. Image Grayscale or Multispectral nullptr
output
outputRealImage
The output real part image. Its dimensions are forced to the same values as the input. Its data type is forced to floating point. Image nullptr
output
outputImaginaryImage
The output imaginary part image. Its dimensions are forced to the same values as the input. Its data type is forced to floating point. Image nullptr

Object Examples

auto polystyrene_float = readVipImage( std::string( IMAGEDEVDATA_IMAGES_FOLDER ) + "polystyrene_float.vip" );

ComplexFftInverse complexFftInverseAlgo;
complexFftInverseAlgo.setInputRealImage( polystyrene_float );
complexFftInverseAlgo.setInputImaginaryImage( polystyrene_float );
complexFftInverseAlgo.execute();

std::cout << "outputRealImage:" << complexFftInverseAlgo.outputRealImage()->toString();
std::cout << "outputImaginaryImage:" << complexFftInverseAlgo.outputImaginaryImage()->toString();
polystyrene_float = imagedev.read_vip_image(imagedev_data.get_image_path("polystyrene_float.vip"))

complex_fft_inverse_algo = imagedev.ComplexFftInverse()
complex_fft_inverse_algo.input_real_image = polystyrene_float
complex_fft_inverse_algo.input_imaginary_image = polystyrene_float
complex_fft_inverse_algo.execute()

print( "output_real_image:", str( complex_fft_inverse_algo.output_real_image ) );
print( "output_imaginary_image:", str( complex_fft_inverse_algo.output_imaginary_image ) );
ImageView polystyrene_float = Data.ReadVipImage( @"Data/images/polystyrene_float.vip" );

ComplexFftInverse complexFftInverseAlgo = new ComplexFftInverse
{
    inputRealImage = polystyrene_float,
    inputImaginaryImage = polystyrene_float
};
complexFftInverseAlgo.Execute();

Console.WriteLine( "outputRealImage:" + complexFftInverseAlgo.outputRealImage.ToString() );
Console.WriteLine( "outputImaginaryImage:" + complexFftInverseAlgo.outputImaginaryImage.ToString() );

Function Examples

auto polystyrene_float = readVipImage( std::string( IMAGEDEVDATA_IMAGES_FOLDER ) + "polystyrene_float.vip" );

auto result = complexFftInverse( polystyrene_float, polystyrene_float );

std::cout << "outputRealImage:" << result.outputRealImage->toString();
std::cout << "outputImaginaryImage:" << result.outputImaginaryImage->toString();
polystyrene_float = imagedev.read_vip_image(imagedev_data.get_image_path("polystyrene_float.vip"))

result_output_real_image, result_output_imaginary_image = imagedev.complex_fft_inverse( polystyrene_float, polystyrene_float )

print( "output_real_image:", str( result_output_real_image ) );
print( "output_imaginary_image:", str( result_output_imaginary_image ) );
ImageView polystyrene_float = Data.ReadVipImage( @"Data/images/polystyrene_float.vip" );

Processing.ComplexFftInverseOutput result = Processing.ComplexFftInverse( polystyrene_float, polystyrene_float );

Console.WriteLine( "outputRealImage:" + result.outputRealImage.ToString() );
Console.WriteLine( "outputImaginaryImage:" + result.outputImaginaryImage.ToString() );