median_weightedmedian_weightedMedianWeightedMedianWeightedmedian_weighted (算子)

名称

median_weightedmedian_weightedMedianWeightedMedianWeightedmedian_weighted — 使用不同秩掩模的加权中值滤波。

签名

median_weighted(Image : ImageWMedian : MaskType, MaskSize : )

描述

算子 median_weightedmedian_weightedMedianWeightedMedianWeightedMedianWeightedmedian_weighted calculates the median of the gray values within a local environment. In contrast to median_imagemedian_imageMedianImageMedianImageMedianImagemedian_image, which uses all gray values within the environment exactly once, the operator median_weightedmedian_weightedMedianWeightedMedianWeightedMedianWeightedmedian_weighted weights all gray values several times depending on their position. A gray value is received into the field to be sorted several times according to its weighting. The following masks are available:

'gauss': (MaskSizeMaskSizeMaskSizeMaskSizemaskSizemask_size = 3) 1 2 1 2 4 2 1 2 1
'inner': (MaskSizeMaskSizeMaskSizeMaskSizemaskSizemask_size = 3) 1 1 1 1 3 1 1 1 1

The operator median_weightedmedian_weightedMedianWeightedMedianWeightedMedianWeightedmedian_weighted means that, contrary to median_imagemedian_imageMedianImageMedianImageMedianImagemedian_image, gray value corners remain.

有关平滑滤波器概念的说明，请参阅滤波器 / 平滑一章的引言。

注意

请注意，若使用域缩减后的图像作为输入，滤波器算子可能会返回意外结果。请参阅滤波器一章

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。
在域级别上自动并行化。

参数

ImageImageImageImageimageimage (输入对象) (multichannel-)image(-array) → object (byte / int2 / uint2)

Image to be filtered.

ImageWMedianImageWMedianImageWMedianImageWMedianimageWMedianimage_wmedian (输出对象) (multichannel-)image(-array) → object (byte / int2 / uint2)

Median filtered image.

MaskTypeMaskTypeMaskTypeMaskTypemaskTypemask_type (输入控制) string → (string)

Type of median mask.

默认值： 'inner' "inner" "inner" "inner" "inner" "inner"

值列表： 'gauss'"gauss""gauss""gauss""gauss""gauss", 'inner'"inner""inner""inner""inner""inner"

MaskSizeMaskSizeMaskSizeMaskSizemaskSizemask_size (输入控制) integer → (integer)

mask size.

默认值： 3

值列表： 3

示例（HDevelop）

read_image(Image,'fabrik')
median_weighted(Image,MedianWeighted,'gauss',3)
dev_display(MedianWeighted)

示例（C）

read_image(&Image,"fabrik");
median_weighted(Image,&MedianWeighted,"gauss",3);
disp_image(MedianWeighted,WindowHandle);

示例（HDevelop）

read_image(Image,'fabrik')
median_weighted(Image,MedianWeighted,'gauss',3)
dev_display(MedianWeighted)

示例（HDevelop）

read_image(Image,'fabrik')
median_weighted(Image,MedianWeighted,'gauss',3)
dev_display(MedianWeighted)

示例（HDevelop）

read_image(Image,'fabrik')
median_weighted(Image,MedianWeighted,'gauss',3)
dev_display(MedianWeighted)

复杂度

For each pixel: O(F * log(F)) with F = area of MaskTypeMaskTypeMaskTypeMaskTypemaskTypemask_type。

可能的前趋

read_imageread_imageReadImageReadImageReadImageread_image

可能的后继

thresholdthresholdThresholdThresholdThresholdthreshold, dyn_thresholddyn_thresholdDynThresholdDynThresholdDynThresholddyn_threshold, regiongrowingregiongrowingRegiongrowingRegiongrowingRegiongrowingregiongrowing

替代

median_imagemedian_imageMedianImageMedianImageMedianImagemedian_image, trimmed_meantrimmed_meanTrimmedMeanTrimmedMeanTrimmedMeantrimmed_mean, sigma_imagesigma_imageSigmaImageSigmaImageSigmaImagesigma_image

参考文献

R. Haralick, L. Shapiro; “Computer and Robot Vision”; Addison-Wesley, 1992, Seite 319

模块

基础

算子