expand_regionexpand_regionExpandRegionExpandRegionexpand_region (算子)

名称

expand_regionexpand_regionExpandRegionExpandRegionexpand_region — 填充区域之间的间隙或分割重叠区域。

签名

描述

expand_regionexpand_regionExpandRegionExpandRegionExpandRegionexpand_region closes gaps between the input regions, which resulted from the suppression of small regions in a segmentation operator, for example, (mode 'image'"image""image""image""image""image"), or to separate overlapping regions (mode 'region'"region""region""region""region""region"). Both uses result from the expansion of regions. The operator works by adding or removing a one pixel wide “strip” to a region.

The expansion takes place only in regions that are designated as not “forbidden” (parameter ForbiddenAreaForbiddenAreaForbiddenAreaForbiddenAreaforbiddenAreaforbidden_area). The number of iterations is determined by the parameter IterationsIterationsIterationsIterationsiterationsiterations. By passing 'maximal'"maximal""maximal""maximal""maximal""maximal", expand_regionexpand_regionExpandRegionExpandRegionExpandRegionexpand_region iterates until convergence, i.e., until no more changes occur. By passing 0 for this parameter, all non-overlapping regions are returned. The two modes of operation ('image'"image""image""image""image""image" and 'region'"region""region""region""region""region") are different in the following ways:

'image'

The input regions are expanded iteratively until they touch another region or the image border. In this case, the image border is defined to be the rectangle ranging from (0,0) to (row_max,col_max). Here, (row_max,col_max) corresponds to the lower right corner of the smallest surrounding rectangle of all input regions (i.e., of all regions that are passed in RegionsRegionsRegionsRegionsregionsregions and ForbiddenAreaForbiddenAreaForbiddenAreaForbiddenAreaforbiddenAreaforbidden_area). Because expand_regionexpand_regionExpandRegionExpandRegionExpandRegionexpand_region processes all regions simultaneously, gaps between regions are distributed evenly to all regions. Overlapping regions are split by distributing the area of overlap evenly to both regions.

'region'

No expansion of the input regions is performed. Instead, only overlapping regions are split by distributing the area of overlap evenly to the respective regions. Because the intersection with the original region is computed after the shrinking operation gaps in the output regions may result, i.e., the segmentation is not complete. This can be prevented by calling expand_regionexpand_regionExpandRegionExpandRegionExpandRegionexpand_region a second time with the complement of the original regions as “forbidden area.”

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,'clip')
threshold(Image,Dark,0,150)
connection(Dark,ConnectedRegions)
gen_circle (Circle, 400, 400, 200.5)
expand_region (ConnectedRegions, Circle, RegionExpanded, 'maximal', 'image')
dev_display (RegionExpanded)

read_image(&Image,"fabrik");
threshold(Image,&Light,100.0,255.0);
disp_region(Light,WindowHandle);
connection(Light,&Seg);
expand_region(Seg,EMPTY_REGION,&Exp1,"maximal","image");
set_colored(WindowHandle,12);
set_draw(WindowHandle,"margin");
disp_region(Exp1,WindowHandle);

read_image(Image,'clip')
threshold(Image,Dark,0,150)
connection(Dark,ConnectedRegions)
gen_circle (Circle, 400, 400, 200.5)
expand_region (ConnectedRegions, Circle, RegionExpanded, 'maximal', 'image')
dev_display (RegionExpanded)

read_image(Image,'clip')
threshold(Image,Dark,0,150)
connection(Dark,ConnectedRegions)
gen_circle (Circle, 400, 400, 200.5)
expand_region (ConnectedRegions, Circle, RegionExpanded, 'maximal', 'image')
dev_display (RegionExpanded)

read_image(Image,'clip')
threshold(Image,Dark,0,150)
connection(Dark,ConnectedRegions)
gen_circle (Circle, 400, 400, 200.5)
expand_region (ConnectedRegions, Circle, RegionExpanded, 'maximal', 'image')
dev_display (RegionExpanded)

结果

expand_regionexpand_regionExpandRegionExpandRegionExpandRegionexpand_region 始终返回值 2 ( H_MSG_TRUE )。当输入为空（未指定区域）时则可设置行为通过 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>)，当输入区域为空时则设置行为通过 set_system('empty_region_result',<Result>)set_system("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)set_system("empty_region_result",<Result>)，以及当结果区域为空时则设置行为通过 set_system('store_empty_region',<'true'/'false'>)set_system("store_empty_region",<"true"/"false">)SetSystem("store_empty_region",<"true"/"false">)SetSystem("store_empty_region",<"true"/"false">)SetSystem("store_empty_region",<"true"/"false">)set_system("store_empty_region",<"true"/"false">)。如有必要，则抛出异常。

可能的前趋

pouringpouringPouringPouringPouringpouring, thresholdthresholdThresholdThresholdThresholdthreshold, dyn_thresholddyn_thresholdDynThresholdDynThresholdDynThresholddyn_threshold, regiongrowingregiongrowingRegiongrowingRegiongrowingRegiongrowingregiongrowing

替代

dilation1dilation1Dilation1Dilation1Dilation1dilation1

另见

expand_grayexpand_grayExpandGrayExpandGrayExpandGrayexpand_gray, interjacentinterjacentInterjacentInterjacentInterjacentinterjacent, skeletonskeletonSkeletonSkeletonSkeletonskeleton

模块

基础