gen_sin_bandpassgen_sin_bandpassGenSinBandpassGenSinBandpassgen_sin_bandpass（算子）
名称
gen_sin_bandpassgen_sin_bandpassGenSinBandpassGenSinBandpassgen_sin_bandpass — 生成正弦形状的带通滤波器。
签名
Herror gen_sin_bandpass(Hobject* ImageFilter, double Frequency, const char* Norm, const char* Mode, const Hlong Width, const Hlong Height)
Herror T_gen_sin_bandpass(Hobject* ImageFilter, const Htuple Frequency, const Htuple Norm, const Htuple Mode, const Htuple Width, const Htuple Height)
void GenSinBandpass(HObject* ImageFilter, const HTuple& Frequency, const HTuple& Norm, const HTuple& Mode, const HTuple& Width, const HTuple& Height)
void HImage::GenSinBandpass(double Frequency, const HString& Norm, const HString& Mode, Hlong Width, Hlong Height)
void HImage::GenSinBandpass(double Frequency, const char* Norm, const char* Mode, Hlong Width, Hlong Height)
void HImage::GenSinBandpass(double Frequency, const wchar_t* Norm, const wchar_t* Mode, Hlong Width, Hlong Height)
(
Windows only)
描述
gen_sin_bandpassgen_sin_bandpassGenSinBandpassGenSinBandpassGenSinBandpassgen_sin_bandpass generates a rotationally invariant bandpass
filter with the response being a sinusoidal function in the
frequency domain. The maximum of the sine is determined by
FrequencyFrequencyFrequencyFrequencyfrequencyfrequency, which is given as a fraction of the maximum
(horizontal and vertical) frequency that can be represented in an
image of size WidthWidthWidthWidthwidthwidth x HeightHeightHeightHeightheightheight, i.e.,
FrequencyFrequencyFrequencyFrequencyfrequencyfrequency should lie between 0 and 1. To achieve a maximum
overall efficiency of the filtering operation, the parameter
NormNormNormNormnormnorm can be used to specify the normalization factor of the
filter. If fft_genericfft_genericFftGenericFftGenericFftGenericfft_generic and NormNormNormNormnormnorm = 'n'"n""n""n""n""n"
is used the normalization in the FFT can be avoided. ModeModeModeModemodemode
can be used to determine where the DC term of the filter lies or
whether the filter should be used in the real-valued FFT. If
fft_genericfft_genericFftGenericFftGenericFftGenericfft_generic is used, 'dc_edge'"dc_edge""dc_edge""dc_edge""dc_edge""dc_edge" can be used to gain
efficiency. If fft_imagefft_imageFftImageFftImageFftImagefft_image and fft_image_invfft_image_invFftImageInvFftImageInvFftImageInvfft_image_inv are used
for filtering, NormNormNormNormnormnorm = 'none'"none""none""none""none""none" and ModeModeModeModemodemode
= 'dc_center'"dc_center""dc_center""dc_center""dc_center""dc_center" must be used. If rft_genericrft_genericRftGenericRftGenericRftGenericrft_generic is
used, ModeModeModeModemodemode = 'rft'"rft""rft""rft""rft""rft" must be used. The filter is
always zero for the DC term, rises with the sine function up to
FrequencyFrequencyFrequencyFrequencyfrequencyfrequency, and drops for higher frequencies accordingly.
The range of the sine used is from 0 to . All other
points are set to zero.
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）。
- 未采用并行化处理。
参数
ImageFilterImageFilterImageFilterImageFilterimageFilterimage_filter (输出对象) image → objectHImageHObjectHImageHobject * (real)
Bandpass filter as image in the frequency domain.
FrequencyFrequencyFrequencyFrequencyfrequencyfrequency (输入控制) real → HTuplefloatHTupleHtuple (real) (double) (double) (double)
Distance of the filter's maximum from the DC term.
默认值：
0.1
建议值：
0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0
限制：
Frequency >= 0
NormNormNormNormnormnorm (输入控制) string → HTuplestrHTupleHtuple (string) (string) (HString) (char*)
Normalizing factor of the filter.
默认值：
'none'
"none"
"none"
"none"
"none"
"none"
值列表：
'n'"n""n""n""n""n", 'none'"none""none""none""none""none"
ModeModeModeModemodemode (输入控制) string → HTuplestrHTupleHtuple (string) (string) (HString) (char*)
Location of the DC term in the frequency domain.
默认值：
'dc_center'
"dc_center"
"dc_center"
"dc_center"
"dc_center"
"dc_center"
值列表：
'dc_center'"dc_center""dc_center""dc_center""dc_center""dc_center", 'dc_edge'"dc_edge""dc_edge""dc_edge""dc_edge""dc_edge", 'rft'"rft""rft""rft""rft""rft"
WidthWidthWidthWidthwidthwidth (输入控制) integer → HTupleintHTupleHtuple (integer) (int / long) (Hlong) (Hlong)
Width of the image (filter).
默认值：
512
建议值：
128, 160, 192, 256, 320, 384, 512, 640, 768, 1024, 2048, 4096, 8192
HeightHeightHeightHeightheightheight (输入控制) integer → HTupleintHTupleHtuple (integer) (int / long) (Hlong) (Hlong)
Height of the image (filter).
默认值：
512
建议值：
120, 128, 144, 240, 256, 288, 480, 512, 576, 1024, 2048, 4096, 8192
结果
gen_sin_bandpassgen_sin_bandpassGenSinBandpassGenSinBandpassGenSinBandpassgen_sin_bandpass 在所有参数正确时返回 2 ( H_MSG_TRUE )。如有必要，则抛出异常。
可能的前趋
fft_imagefft_imageFftImageFftImageFftImagefft_image,
fft_genericfft_genericFftGenericFftGenericFftGenericfft_generic,
rft_genericrft_genericRftGenericRftGenericRftGenericrft_generic
可能的后继
convol_fftconvol_fftConvolFftConvolFftConvolFftconvol_fft
替代
gen_std_bandpassgen_std_bandpassGenStdBandpassGenStdBandpassGenStdBandpassgen_std_bandpass
另见
fft_image_invfft_image_invFftImageInvFftImageInvFftImageInvfft_image_inv,
gen_gauss_filtergen_gauss_filterGenGaussFilterGenGaussFilterGenGaussFiltergen_gauss_filter,
gen_mean_filtergen_mean_filterGenMeanFilterGenMeanFilterGenMeanFiltergen_mean_filter,
gen_derivative_filtergen_derivative_filterGenDerivativeFilterGenDerivativeFilterGenDerivativeFiltergen_derivative_filter,
gen_bandpassgen_bandpassGenBandpassGenBandpassGenBandpassgen_bandpass,
gen_bandfiltergen_bandfilterGenBandfilterGenBandfilterGenBandfiltergen_bandfilter,
gen_highpassgen_highpassGenHighpassGenHighpassGenHighpassgen_highpass,
gen_lowpassgen_lowpassGenLowpassGenLowpassGenLowpassgen_lowpass
模块
基础