noise_distribution_meanT_noise_distribution_meanNoiseDistributionMeanNoiseDistributionMeannoise_distribution_mean (算子名称)
名称
noise_distribution_meanT_noise_distribution_meanNoiseDistributionMeanNoiseDistributionMeannoise_distribution_mean — Determine the noise distribution of an image.
参数签名
描述
noise_distribution_meannoise_distribution_meanNoiseDistributionMeanNoiseDistributionMeanNoiseDistributionMeannoise_distribution_mean calculates the noise
distribution in a region of the image ImageImageImageImageimageimage. The
parameter ConstRegionConstRegionConstRegionConstRegionconstRegionconst_region determines a region of the image
with approximately constant gray values. Ideally, the changes in
gray values should only be caused by noise in this region. From
this region the noise distribution is determined by using the
mean_imagemean_imageMeanImageMeanImageMeanImagemean_image operator to smooth the image, and to use the gray
value differences in this area as an estimate for the noise
distribution, which is returned in DistributionDistributionDistributionDistributiondistributiondistribution.
注意
It is important to ensure that the region ConstRegionConstRegionConstRegionConstRegionconstRegionconst_region is
not too close to a large gradient in the image, because the gradient
values are then used for calculating the mean. This means the
distance of ConstRegionConstRegionConstRegionConstRegionconstRegionconst_region must be at least as large as the
filter size FilterSizeFilterSizeFilterSizeFilterSizefilterSizefilter_size used for calculating the mean.
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)。
- 未经并行化处理。
参数表
ConstRegionConstRegionConstRegionConstRegionconstRegionconst_region (input_object) region(-array) → objectHRegionHObjectHRegionHobject
Region from which the noise distribution is to
be estimated.
ImageImageImageImageimageimage (input_object) singlechannelimage → objectHImageHObjectHImageHobject (byte)
Corresponding image.
FilterSizeFilterSizeFilterSizeFilterSizefilterSizefilter_size (input_control) integer → HTupleintHTupleHtuple (integer) (int / long) (Hlong) (Hlong)
Size of the mean filter.
Default:
21
Suggested values:
5, 11, 15, 21, 31, 51, 101
Value range:
3
≤
FilterSize
FilterSize
FilterSize
FilterSize
filterSize
filter_size
≤
501 (lin)
Minimum increment:
2
Recommended increment:
2
DistributionDistributionDistributionDistributiondistributiondistribution (output_control) distribution.values-array → HTupleSequence[float]HTupleHtuple (real) (double) (double) (double)
Noise distribution of all input regions.
可能的前置算子
draw_regiondraw_regionDrawRegionDrawRegionDrawRegiondraw_region,
gen_circlegen_circleGenCircleGenCircleGenCirclegen_circle,
gen_ellipsegen_ellipseGenEllipseGenEllipseGenEllipsegen_ellipse,
gen_rectangle1gen_rectangle1GenRectangle1GenRectangle1GenRectangle1gen_rectangle1,
gen_rectangle2gen_rectangle2GenRectangle2GenRectangle2GenRectangle2gen_rectangle2,
thresholdthresholdThresholdThresholdThresholdthreshold,
erosion_circleerosion_circleErosionCircleErosionCircleErosionCircleerosion_circle,
binomial_filterbinomial_filterBinomialFilterBinomialFilterBinomialFilterbinomial_filter,
gauss_filtergauss_filterGaussFilterGaussFilterGaussFiltergauss_filter,
smooth_imagesmooth_imageSmoothImageSmoothImageSmoothImagesmooth_image,
sub_imagesub_imageSubImageSubImageSubImagesub_image
可能的后置算子
add_noise_distributionadd_noise_distributionAddNoiseDistributionAddNoiseDistributionAddNoiseDistributionadd_noise_distribution
参考其它
mean_imagemean_imageMeanImageMeanImageMeanImagemean_image,
gauss_distributiongauss_distributionGaussDistributionGaussDistributionGaussDistributiongauss_distribution
模块
Foundation