orientation_regionorientation_regionOrientationRegionOrientationRegionorientation_region（算子）

名称

orientation_regionorientation_regionOrientationRegionOrientationRegionorientation_region — 一个区域的方向。

签名

描述

算子 orientation_regionorientation_regionOrientationRegionOrientationRegionOrientationRegionorientation_region calculates the orientation of the region. The operator is based on elliptic_axiselliptic_axisEllipticAxisEllipticAxisEllipticAxiselliptic_axis。In addition the point on the contour with maximal distance to the center of gravity is calculated. If, in the rotated coordinate system, the column coordinate of this point is less than the column coordinate of the center of gravity, the value of is added to the angle.

In the documentation of this chapter (Regions / Features), you can find an image illustrating regions which vary in their orientation.

If more than one region is passed the results are stored in tuples, the index of a value in the tuple corresponding to the index of a region in the input.

In case of empty region all parameters have the value 0.0 if no other behavior was set (see 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>)).

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。

参数

复杂度

If F is the area of a region the mean runtime complexity is O(sqrt(F)).

结果

算子 orientation_regionorientation_regionOrientationRegionOrientationRegionOrientationRegionorientation_region 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>)。空区域（区域是空集）的情况下的可设置行为通过 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>)。如有必要，则抛出异常。

可能的前趋

thresholdthresholdThresholdThresholdThresholdthreshold, regiongrowingregiongrowingRegiongrowingRegiongrowingRegiongrowingregiongrowing, connectionconnectionConnectionConnectionConnectionconnection

可能的后继

disp_arrowdisp_arrowDispArrowDispArrowDispArrowdisp_arrow

替代

elliptic_axiselliptic_axisEllipticAxisEllipticAxisEllipticAxiselliptic_axis, smallest_rectangle2smallest_rectangle2SmallestRectangle2SmallestRectangle2SmallestRectangle2smallest_rectangle2

另见

moments_region_2ndmoments_region_2ndMomentsRegion2ndMomentsRegion2ndMomentsRegion2ndmoments_region_2nd, line_orientationline_orientationLineOrientationLineOrientationLineOrientationline_orientation

模块

基础