eliminate_min_maxeliminate_min_maxEliminateMinMaxEliminateMinMaxeliminate_min_max (算子)

名称

eliminate_min_maxeliminate_min_maxEliminateMinMaxEliminateMinMaxeliminate_min_max — 在空间域中平滑图像以抑制噪声。

签名

描述

eliminate_min_maxeliminate_min_maxEliminateMinMaxEliminateMinMaxEliminateMinMaxeliminate_min_max smooths an image by replacing gray values with neighboring mean values, or local minima/maxima. In order to prevent edges and lines from being smoothed, only those gray values that represent local minima or maxima are replaced (if there is a line or edge within an image there will be at least one neighboring pixel with a comparable gray value). GapGapGapGapgapgap controls the strictness of replacement: Only gray values that exceed all other values within their local neighborhood more than GapGapGapGapgapgap and all values that fall below their neighboring more than GapGapGapGapgapgap are replaced.

Thus, with being the gray value at position and representing the gray values of a sized rectangular neighborhood of a pixel at position , containing all pixels within the neighborhood except the pixel itself, a pixel is replaced

• if , or

• else if 。

• Elsewise is adopted without change.

ModeModeModeModemodemode specifies how to perform the new value in case of a replacement.

• ModeModeModeModemodemode = 1: replace a local maximum with next minor local maximum and replace a local minimum with next bigger local minimum.

• ModeModeModeModemodemode = 2: replace with mean value of all pixels within the local neighborhood (including the replaced pixel).

• ModeModeModeModemodemode = 3: replace with median value of all pixels within the local neighborhood (including the replaced pixel (also used if ModeModeModeModemodemode has got any other value than 1 or 2).

MaskWidthMaskWidthMaskWidthMaskWidthmaskWidthmask_width and MaskHeightMaskHeightMaskHeightMaskHeightmaskHeightmask_height specify the width and height of the rectangular neighborhood. Border treatment: Pixels outside the image border are not considered (e.g., with a local -mask the neighborhood of a pixel at reduces to the pixels at , , and ).

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

eliminate_min_maxeliminate_min_maxEliminateMinMaxEliminateMinMaxEliminateMinMaxeliminate_min_max only can work on byte images (HALCON image type BYTE_IMAGE). If MaskWidthMaskWidthMaskWidthMaskWidthmaskWidthmask_width or MaskHeightMaskHeightMaskHeightMaskHeightmaskHeightmask_height is an even number, it is replaced by the next higher odd number (this allows the unique extraction of the center of the filter mask). Width/height of the mask may not exceed the image width/height.

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

结果

eliminate_min_maxeliminate_min_maxEliminateMinMaxEliminateMinMaxEliminateMinMaxeliminate_min_max 在所有参数正确时返回 2 ( H_MSG_TRUE )。 如果输入为空，eliminate_min_maxeliminate_min_maxEliminateMinMaxEliminateMinMaxEliminateMinMaxeliminate_min_max 返回一条错误消息。

可能的后继

wiener_filterwiener_filterWienerFilterWienerFilterWienerFilterwiener_filter, wiener_filter_niwiener_filter_niWienerFilterNiWienerFilterNiWienerFilterNiwiener_filter_ni

另见

mean_spmean_spMeanSpMeanSpMeanSpmean_sp, mean_imagemean_imageMeanImageMeanImageMeanImagemean_image, median_imagemedian_imageMedianImageMedianImageMedianImagemedian_image, median_weightedmedian_weightedMedianWeightedMedianWeightedMedianWeightedmedian_weighted, binomial_filterbinomial_filterBinomialFilterBinomialFilterBinomialFilterbinomial_filter, gauss_filtergauss_filterGaussFilterGaussFilterGaussFiltergauss_filter, smooth_imagesmooth_imageSmoothImageSmoothImageSmoothImagesmooth_image

参考文献

M. Imme:“A Noise Peak Elimination Filter”; S. 204-211 in CVGIP Graphical Models and Image Processing, Vol. 53, No. 2, March 1991
M. Lückenhaus:“Grundlagen des Wiener-Filters und seine Anwendung in der Bildanalyse”; Diplomarbeit; Technische Universität München, Institut für Informatik; Lehrstuhl Prof. Radig; 1995.

模块

基础

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