power_lnpower_lnPowerLnPowerLn (Operator)

Name

power_lnpower_lnPowerLnPowerLn — Return the power spectrum of a complex image.

power_lnpower_lnPowerLnPowerLnPowerLn computes the power spectrum from the real and imaginary parts of a Fourier-transformed image (see fft_imagefft_imageFftImageFftImageFftImage), 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". The following formula is used:

Execution Information

Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Automatically parallelized on tuple level.
Automatically parallelized on channel level.
Automatically parallelized on domain level.

Parameters

ImageImageImageImageimage (input_object) (multichannel-)image(-array) → object (complex)

Input image in frequency domain.

ImageResultImageResultImageResultImageResultimageResult (output_object) image(-array) → object (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_lnPowerLnPowerLnPowerLn 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>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>). If necessary, an exception is raised.

Possible Predecessors

fft_imagefft_imageFftImageFftImageFftImage, fft_genericfft_genericFftGenericFftGenericFftGeneric, rft_genericrft_genericRftGenericRftGenericRftGeneric, convol_fftconvol_fftConvolFftConvolFftConvolFft, convol_gaborconvol_gaborConvolGaborConvolGaborConvolGabor

Possible Successors

disp_imagedisp_imageDispImageDispImageDispImage, convert_image_typeconvert_image_typeConvertImageTypeConvertImageTypeConvertImageType, scale_imagescale_imageScaleImageScaleImageScaleImage

Alternatives

abs_imageabs_imageAbsImageAbsImageAbsImage, convert_image_typeconvert_image_typeConvertImageTypeConvertImageTypeConvertImageType, power_realpower_realPowerRealPowerRealPowerReal, power_bytepower_bytePowerBytePowerBytePowerByte

Module

Foundation

Operators