info_edgesT_info_edgesInfoEdgesInfoEdgesinfo_edges（算子）

名称

info_edgesT_info_edgesInfoEdgesInfoEdgesinfo_edges — 返回 edges_imageedges_imageEdgesImageEdgesImageEdgesImageedges_image 中滤波器的滤波系数。

签名

描述

info_edgesinfo_edgesInfoEdgesInfoEdgesInfoEdgesinfo_edges returns the coefficients CoeffsCoeffsCoeffsCoeffscoeffscoeffs and an estimate of the width SizeSizeSizeSizesizesize of any of the filters used in edges_imageedges_imageEdgesImageEdgesImageEdgesImageedges_image。To do so, the corresponding continuous impulse responses of the filters are sampled until the first filter coefficient is smaller than five percent of the largest coefficient. AlphaAlphaAlphaAlphaalphaalpha is the filter parameter (see edges_imageedges_imageEdgesImageEdgesImageEdgesImageedges_image). Seven edge operators are supported (parameter FilterFilterFilterFilterfilterfilter):

'deriche1'"deriche1""deriche1""deriche1""deriche1""deriche1", 'lanser1'"lanser1""lanser1""lanser1""lanser1""lanser1", 'deriche2'"deriche2""deriche2""deriche2""deriche2""deriche2", 'lanser2'"lanser2""lanser2""lanser2""lanser2""lanser2", 'shen'"shen""shen""shen""shen""shen", 'mshen'"mshen""mshen""mshen""mshen""mshen" 和 'canny'"canny""canny""canny""canny""canny".

The parameter ModeModeModeModemodemode ('edge'"edge""edge""edge""edge""edge"/'smooth'"smooth""smooth""smooth""smooth""smooth") is used to determine whether the corresponding edge or smoothing operator is to be sampled.

The Canny operator (which uses Gaussian smoothing) is implemented using conventional filter masks. Therefore, for the Canny filter, the coefficients CoeffsCoeffsCoeffsCoeffscoeffscoeffs of the one-dimensional impulse responses are returned as . All other filters are implemented recursively; here, the CoeffsCoeffsCoeffsCoeffscoeffscoeffs are coefficients of a corresponding non-recursive filter.

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）。
• 未采用并行化处理。

参数

read_image(Image,'fabrik')
info_edges('lanser2','edge',0.5,Size,Coeffs)
edges_image(Image,Amp,Dir,'lanser2',0.5,'none',-1,-1)
hysteresis_threshold(Amp,Margin,20,30,30)

read_image(&Image,"fabrik");
info_edges("lanser2","edge",0.5,Size,Coeffs);
edges_image(Image,&Amp,&Dir,"lanser2",0.5,"none",-1,-1);
hysteresis_threshold(Amp,&Margin,20,30,30);

read_image(Image,'fabrik')
info_edges('lanser2','edge',0.5,Size,Coeffs)
edges_image(Image,Amp,Dir,'lanser2',0.5,'none',-1,-1)
hysteresis_threshold(Amp,Margin,20,30,30)

read_image(Image,'fabrik')
info_edges('lanser2','edge',0.5,Size,Coeffs)
edges_image(Image,Amp,Dir,'lanser2',0.5,'none',-1,-1)
hysteresis_threshold(Amp,Margin,20,30,30)

read_image(Image,'fabrik')
info_edges('lanser2','edge',0.5,Size,Coeffs)
edges_image(Image,Amp,Dir,'lanser2',0.5,'none',-1,-1)
hysteresis_threshold(Amp,Margin,20,30,30)

结果

info_edgesinfo_edgesInfoEdgesInfoEdgesInfoEdgesinfo_edges 在所有参数正确时返回 2 (H_MSG_TRUE)。当输入为空时，可设置行为通过算子 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>)。如有必要，则抛出异常。

可能的后继

edges_imageedges_imageEdgesImageEdgesImageEdgesImageedges_image, thresholdthresholdThresholdThresholdThresholdthreshold, skeletonskeletonSkeletonSkeletonSkeletonskeleton

另见

edges_imageedges_imageEdgesImageEdgesImageEdgesImageedges_image

模块

基础