hough_line_transhough_line_transHoughLineTransHoughLineTranshough_line_trans（算子）

名称

hough_line_transhough_line_transHoughLineTransHoughLineTranshough_line_trans — 为区域内的线生成霍夫变换。

签名

描述

算子 hough_line_transhough_line_transHoughLineTransHoughLineTransHoughLineTranshough_line_trans calculates the Hough transform for lines in those regions transmitted by RegionRegionRegionRegionregionregion. Thereby the angles and the lengths of the lines' normal vectors are registered in the parameter space (the Hough- or accumulator space respectively). This means that the parametrization is executed according to the HNF.

The result is registered in a newly generated Int2-Image (HoughImageHoughImageHoughImageHoughImagehoughImagehough_image), whereby the x-axis is equivalent to the angle between the normal vector and the x-axis (in the original image), and the y-axis is equivalent to the distance of the line from the origin.

The angle ranges from -90 to 180 degrees and will be registered with a resolution of 1 / AngleResolutionAngleResolutionAngleResolutionAngleResolutionangleResolutionangle_resolution, which means that one pixel in x-direction is equivalent to 1 / AngleResolutionAngleResolutionAngleResolutionAngleResolutionangleResolutionangle_resolution and that the HoughImageHoughImageHoughImageHoughImagehoughImagehough_image has a width of 270 * AngleResolutionAngleResolutionAngleResolutionAngleResolutionangleResolutionangle_resolution + 1 pixel. The height of the HoughImageHoughImageHoughImageHoughImagehoughImagehough_image corresponds to the distance between the lower right corner of the surrounding rectangle of the input region and the origin.

The maxima in the result image are equivalent to the parameter values of the lines in the original image.

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_line_transhough_line_transHoughLineTransHoughLineTransHoughLineTranshough_line_trans 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

thresholdthresholdThresholdThresholdThresholdthreshold, local_maxlocal_maxLocalMaxLocalMaxLocalMaxlocal_max

另见

hough_circle_transhough_circle_transHoughCircleTransHoughCircleTransHoughCircleTranshough_circle_trans, gen_region_hlinegen_region_hlineGenRegionHlineGenRegionHlineGenRegionHlinegen_region_hline

模块

基础