power_bytePowerBytePowerBytepower_bytepower_byte🔗

Short description🔗

power_bytePowerBytePowerBytepower_bytepower_byte — Return the power spectrum of a complex image.

Signature🔗

power_byte( image Image, out image PowerByte )

HImage HImage::PowerByte( ) const

HImage HImage.PowerByte( )

Description🔗

power_bytePowerByte computes the power spectrum from the real and imaginary parts of a Fourier-transformed image (see fft_imageFftImage), i.e., the modulus of the frequencies. The result image is of type 'byte'"byte". The following formula is used:

\[\begin{eqnarray*} \sqrt{real part^2 + imaginary part^2} \enspace . \end{eqnarray*}\]

Please note, that resulting gray values that exceed the value of 255 are clipped at 255 because of the resulting image type 'byte'"byte".

Execution information🔗

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🔗

Imageimageimage (input_object) (multichannel-)image(-array) → object (complex)HObject (complex)HImage (complex)HObject (complex)Hobject (complex)

Input image in frequency domain.

PowerBytepowerBytepower_byte (output_object) image(-array) → object (byte)HObject (byte)HImage (byte)HObject (byte)Hobject * (byte)

Power spectrum of the input image.

Example🔗

(C)

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

Result🔗

power_bytePowerByte 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>:). If necessary, an exception is raised.

Combinations with other operators🔗

Combinations

Possible predecessors

fft_imageFftImage, fft_genericFftGeneric, rft_genericRftGeneric, convol_fftConvolFft, convol_gaborConvolGabor

Possible successors

disp_imageDispImage

Alternatives

abs_imageAbsImage, convert_image_typeConvertImageType, power_realPowerReal, power_lnPowerLn

Module🔗

Foundation