fft_imagefft_imageFftImageFftImagefft_image (算子名称)

名称

fft_imagefft_imageFftImageFftImagefft_image — Compute the fast Fourier transform of an image.

参数签名

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.

运行信息

• 多线程类型:可重入(与非独占操作符并行运行)。
• 多线程作用域:全局(可以从任何线程调用)。
• 在元组级别自动并行化。
• 在图像通道级别自动并行化。
• Automatically parallelized on internal data level.

参数表

结果

fft_imagefft_imageFftImageFftImageFftImagefft_image returns 2 ( H_MSG_TRUE) if the input 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.

可能的前置算子

optimize_fft_speedoptimize_fft_speedOptimizeFftSpeedOptimizeFftSpeedOptimizeFftSpeedoptimize_fft_speed, read_fft_optimization_dataread_fft_optimization_dataReadFftOptimizationDataReadFftOptimizationDataReadFftOptimizationDataread_fft_optimization_data

可能的后置算子

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

可替代算子

fft_genericfft_genericFftGenericFftGenericFftGenericfft_generic, rft_genericrft_genericRftGenericRftGenericRftGenericrft_generic

参考其它

fft_image_invfft_image_invFftImageInvFftImageInvFftImageInvfft_image_inv

模块

Foundation

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