power_ln power_ln PowerLn PowerLn power_ln (Operator)
Name
power_ln power_ln PowerLn PowerLn power_ln
— Return the power spectrum of a complex image.
Signature
def power_ln (image : HObject) -> HObject
Description
power_ln power_ln PowerLn PowerLn PowerLn power_ln
computes the power spectrum from the real and
imaginary parts of a Fourier-transformed image (see
fft_image fft_image FftImage FftImage FftImage fft_image
), i.e., the modulus of the frequencies.
Additionally, the natural logarithm is applied to the result. The
result image is of type 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
Image Image Image Image image image
(input_object) (multichannel-)image(-array) →
object HImage HObject HImage Hobject (complex)
Input image in frequency domain.
ImageResult ImageResult ImageResult ImageResult imageResult image_result
(output_object) image(-array) →
object HImage HObject HImage Hobject * (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_ln power_ln PowerLn PowerLn PowerLn power_ln
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>) set_system("no_object_result",<Result>)
.
If necessary, an exception is raised.
Possible Predecessors
fft_image fft_image FftImage FftImage FftImage fft_image
,
fft_generic fft_generic FftGeneric FftGeneric FftGeneric fft_generic
,
rft_generic rft_generic RftGeneric RftGeneric RftGeneric rft_generic
,
convol_fft convol_fft ConvolFft ConvolFft ConvolFft convol_fft
,
convol_gabor convol_gabor ConvolGabor ConvolGabor ConvolGabor convol_gabor
Possible Successors
disp_image disp_image DispImage DispImage DispImage disp_image
,
convert_image_type convert_image_type ConvertImageType ConvertImageType ConvertImageType convert_image_type
,
scale_image scale_image ScaleImage ScaleImage ScaleImage scale_image
Alternatives
abs_image abs_image AbsImage AbsImage AbsImage abs_image
,
convert_image_type convert_image_type ConvertImageType ConvertImageType ConvertImageType convert_image_type
,
power_real power_real PowerReal PowerReal PowerReal power_real
,
power_byte power_byte PowerByte PowerByte PowerByte power_byte
See also
fft_image fft_image FftImage FftImage FftImage fft_image
,
fft_generic fft_generic FftGeneric FftGeneric FftGeneric fft_generic
,
rft_generic rft_generic RftGeneric RftGeneric RftGeneric rft_generic
Module
Foundation