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power_lnpower_lnPowerLnpower_lnPowerLnPowerLn (Operator)

Name

power_lnpower_lnPowerLnpower_lnPowerLnPowerLn — Return the power spectrum of a complex image.

Signature

power_ln(Image : ImageResult : : )

Herror power_ln(const Hobject Image, Hobject* ImageResult)

Herror T_power_ln(const Hobject Image, Hobject* ImageResult)

Herror power_ln(Hobject Image, Hobject* ImageResult)

HImage HImage::PowerLn() const

HImageArray HImageArray::PowerLn() const

void PowerLn(const HObject& Image, HObject* ImageResult)

HImage HImage::PowerLn() const

void HOperatorSetX.PowerLn(
[in] IHUntypedObjectX* Image, [out] IHUntypedObjectX*ImageResult)

IHImageX* HImageX.PowerLn()

static void HOperatorSet.PowerLn(HObject image, out HObject imageResult)

HImage HImage.PowerLn()

Description

power_lnpower_lnPowerLnpower_lnPowerLnPowerLn computes the power spectrum from the real and imaginary parts of a Fourier-transformed image (see fft_imagefft_imageFftImagefft_imageFftImageFftImage), i.e., the modulus of the frequencies. Additionally, the natural logarithm is applied to the result. The result image is of type 'real'"real""real""real""real""real". The following formula is used:

Parallelization

Parameters

ImageImageImageImageImageimage (input_object)  (multichannel-)image(-array) objectHImageHImageHImageHImageXHobject (complex)

Input image in frequency domain.

ImageResultImageResultImageResultImageResultImageResultimageResult (output_object)  image(-array) objectHImageHImageHImageHImageXHobject * (real)

Power spectrum of the input image.

Example (C)

read_image(&Image,"monkey");
disp_image(Image,WindowHandle);
fft_image(Image,&FFT);
power_ln(FFT,&Power);
disp_image(Power,WindowHandle);

Result

power_lnpower_lnPowerLnpower_lnPowerLnPowerLn returns 2 (H_MSG_TRUE) if the image is of correct type. If the input is empty the behavior can be set via set_system(::'no_object_result',<Result>:)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>). If necessary, an exception is raised.

Possible Predecessors

fft_imagefft_imageFftImagefft_imageFftImageFftImage, fft_genericfft_genericFftGenericfft_genericFftGenericFftGeneric, rft_genericrft_genericRftGenericrft_genericRftGenericRftGeneric, convol_fftconvol_fftConvolFftconvol_fftConvolFftConvolFft, convol_gaborconvol_gaborConvolGaborconvol_gaborConvolGaborConvolGabor

Possible Successors

disp_imagedisp_imageDispImagedisp_imageDispImageDispImage, convert_image_typeconvert_image_typeConvertImageTypeconvert_image_typeConvertImageTypeConvertImageType, scale_imagescale_imageScaleImagescale_imageScaleImageScaleImage

Alternatives

abs_imageabs_imageAbsImageabs_imageAbsImageAbsImage, convert_image_typeconvert_image_typeConvertImageTypeconvert_image_typeConvertImageTypeConvertImageType, power_realpower_realPowerRealpower_realPowerRealPowerReal, power_bytepower_bytePowerBytepower_bytePowerBytePowerByte

See also

fft_imagefft_imageFftImagefft_imageFftImageFftImage, fft_genericfft_genericFftGenericfft_genericFftGenericFftGeneric, rft_genericrft_genericRftGenericrft_genericRftGenericRftGeneric

Module

Foundation


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