hough_linesT_hough_linesHoughLinesHoughLineshough_lines（算子）

名称

hough_linesT_hough_linesHoughLinesHoughLineshough_lines — 在霍夫变换的帮助下检测边缘图像中的线，并以 HNF 格式返回。

签名

描述

算子 hough_lineshough_linesHoughLinesHoughLinesHoughLineshough_lines allows the selection of linelike structures in a region, whereby it is not necessary that the individual points of a line are connected. This process is based on the Hough transform.

The parameter AngleResolutionAngleResolutionAngleResolutionAngleResolutionangleResolutionangle_resolution defines the degree of exactness concerning the determination of the angles. It amounts to 1 / AngleResolutionAngleResolutionAngleResolutionAngleResolutionangleResolutionangle_resolution degree. The parameter ThresholdThresholdThresholdThresholdthresholdthreshold determines by how many points of the original region a line's hypothesis must at least be supported in order to be selected into the output. The parameters AngleGapAngleGapAngleGapAngleGapangleGapangle_gap and DistGapDistGapDistGapDistGapdistGapdist_gap define a neighborhood of the points in the Hough image in order to determine the local maxima: AngleGapAngleGapAngleGapAngleGapangleGapangle_gap describes the minimum distance of two maxima in the Hough image in angle direction and DistGapDistGapDistGapDistGapdistGapdist_gap in distance direction, respectively. Thus, maxima exceeding ThresholdThresholdThresholdThresholdthresholdthreshold but lying close to an even higher maximum are eliminated. If multiple maxima in this neighborhood are equally high, all of them are returned. This elimination can particularly be helpful when searching for short and long lines simultaneously. The lines are returned in Hessian Normal Form (HNF), that is by the direction AngleAngleAngleAngleangleangle and length DistDistDistDistdistdist of their normal vectors.

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

结果

算子 hough_lineshough_linesHoughLinesHoughLinesHoughLineshough_lines 在输入不为空时返回值 2 ( H_MSG_TRUE )。当输入为空（无可用输入区域）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>), the behavior in case of empty region is set via 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>)。如有必要，则抛出异常。

可能的前趋

thresholdthresholdThresholdThresholdThresholdthreshold, skeletonskeletonSkeletonSkeletonSkeletonskeleton

可能的后继

select_matching_linesselect_matching_linesSelectMatchingLinesSelectMatchingLinesSelectMatchingLinesselect_matching_lines

另见

hough_line_transhough_line_transHoughLineTransHoughLineTransHoughLineTranshough_line_trans, gen_region_hlinegen_region_hlineGenRegionHlineGenRegionHlineGenRegionHlinegen_region_hline, hough_circleshough_circlesHoughCirclesHoughCirclesHoughCircleshough_circles

模块

基础