fft_imagefft_imageFftImageFftImagefft_image（算子）
名称
fft_imagefft_imageFftImageFftImagefft_image — 计算图像的快速傅里叶变换。
签名
def fft_image(image: HObject) -> HObject
描述
fft_imagefft_imageFftImageFftImageFftImagefft_image calculates the Fourier transform of the input
image (ImageImageImageImageimageimage), i.e., it transforms the image into the
frequency domain. The algorithm used is the fast Fourier transform.
This corresponds to the call
fft_generic(Image,ImageFFT,'to_freq',-1,'sqrt','dc_center','complex')fft_generic(Image,ImageFFT,"to_freq",-1,"sqrt","dc_center","complex")FftGeneric(Image,ImageFFT,"to_freq",-1,"sqrt","dc_center","complex")FftGeneric(Image,ImageFFT,"to_freq",-1,"sqrt","dc_center","complex")FftGeneric(Image,ImageFFT,"to_freq",-1,"sqrt","dc_center","complex")fft_generic(Image,ImageFFT,"to_freq",-1,"sqrt","dc_center","complex")。
注意
The transformation is always performed for the entire image, i.e., the
domain of the image is ignored.
执行信息
- 多线程类型：可重入（与非独占算子并行运行）。
- 多线程作用域：全局（可从任何线程调用）。
- 在元组级别上自动并行化。
- 在通道级别上自动并行化。
- 在内部数据级别上自动并行化。
参数
ImageImageImageImageimageimage (输入对象) (multichannel-)image(-array) → objectHImageHObjectHImageHobject (byte / real)
输入图像。
ImageFFTImageFFTImageFFTImageFFTimageFFTimage_fft (输出对象) image(-array) → objectHImageHObjectHImageHobject * (complex)
Fourier-transformed image.
结果
fft_imagefft_imageFftImageFftImageFftImagefft_image returns 2 (
H_MSG_TRUE)
if the input image is of correct
type.当输入为空时，可设置行为通过算子 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>)。如有必要，则抛出异常。
可能的前趋
optimize_fft_speedoptimize_fft_speedOptimizeFftSpeedOptimizeFftSpeedOptimizeFftSpeedoptimize_fft_speed,
read_fft_optimization_dataread_fft_optimization_dataReadFftOptimizationDataReadFftOptimizationDataReadFftOptimizationDataread_fft_optimization_data
可能的后继
convol_fftconvol_fftConvolFftConvolFftConvolFftconvol_fft,
convol_gaborconvol_gaborConvolGaborConvolGaborConvolGaborconvol_gabor,
convert_image_typeconvert_image_typeConvertImageTypeConvertImageTypeConvertImageTypeconvert_image_type,
power_bytepower_bytePowerBytePowerBytePowerBytepower_byte,
power_realpower_realPowerRealPowerRealPowerRealpower_real,
power_lnpower_lnPowerLnPowerLnPowerLnpower_ln,
phase_degphase_degPhaseDegPhaseDegPhaseDegphase_deg,
phase_radphase_radPhaseRadPhaseRadPhaseRadphase_rad
替代
fft_genericfft_genericFftGenericFftGenericFftGenericfft_generic,
rft_genericrft_genericRftGenericRftGenericRftGenericrft_generic
另见
fft_image_invfft_image_invFftImageInvFftImageInvFftImageInvfft_image_inv
模块
基础