Return the power spectrum of a complex image.
::power_byte computes the power spectrum from the real and imaginary parts of a Fourier-transformed image (see ::fft_image), i.e., the modulus of the frequencies. The result image is of type 'byte'. The following formula is used:
sqrt(real part**2 + imaginary part**2) .
|
Image (input_object) |
image(-array) -> Hobject: HImage(Array) ( complex ) |
| Input image in frequency domain. | |
|
PowerByte (output_object) |
image(-array) -> Hobject * : HImage(Array) ( byte ) |
| Power spectrum of the input image. | |
read_image(&Image,"affe"); disp_image(Image,WindowHandle); fft_image(Image,&FFT); power_byte(FFT,&Power); disp_image(Power,WindowHandle);
::power_byte returns H_MSG_TRUE if the image is of correct type. If the input is empty the behaviour can be set via ::set_system('no_object_result',<Result>). If necessary, an exception handling is raised.
::fft_image, ::fft_generic, ::convol_fft, ::convol_gabor
::abs_image, ::convert_image_type, ::power_real, ::power_ln
Image filters
