height_width_ratioheight_width_ratioHeightWidthRatioHeightWidthRatioheight_width_ratio (算子)

名称

height_width_ratioheight_width_ratioHeightWidthRatioHeightWidthRatioheight_width_ratio — 计算平行于坐标轴的周围矩形的宽度、高度和纵横比。

签名

描述

The operator height_width_ratioheight_width_ratioHeightWidthRatioHeightWidthRatioHeightWidthRatioheight_width_ratio calculates the surrounding rectangle of all input regions (parallel to the coordinate axes). The surrounding rectangle is described by the coordinates of the corner pixels (Row1Row1Row1Row1row1row_1,Column1Column1Column1Column1column1column_1,Row2Row2Row2Row2row2row_2,Column2Column2Column2Column2column2column_2) (see smallest_rectangle1smallest_rectangle1SmallestRectangle1SmallestRectangle1SmallestRectangle1smallest_rectangle1). Based on these values, height_width_ratioheight_width_ratioHeightWidthRatioHeightWidthRatioHeightWidthRatioheight_width_ratio computes the width, height, and aspect ratio of the smallest surrounding rectangle as follows:

If more than one region is passed in RegionsRegionsRegionsRegionsregionsregions, the results are stored in tuples in the same order as the respective regions in the RegionsRegionsRegionsRegionsregionsregions. In case of empty regions, all parameters have the value 0 if no other behavior was set (see set_systemset_systemSetSystemSetSystemSetSystemset_system).

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

复杂性

若 F 为区域面积，则平均运行时间复杂生为 O(√F)。

结果

The operator height_width_ratioheight_width_ratioHeightWidthRatioHeightWidthRatioHeightWidthRatioheight_width_ratio returns the value 2 ( H_MSG_TRUE) if the input is not empty. The behavior in case of empty input (no input regions available) is set via the operator 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 (the region is the empty set) 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>). If necessary an exception is raised.

可能的前趋

thresholdthresholdThresholdThresholdThresholdthreshold, regiongrowingregiongrowingRegiongrowingRegiongrowingRegiongrowingregiongrowing, connectionconnectionConnectionConnectionConnectionconnection, runlength_featuresrunlength_featuresRunlengthFeaturesRunlengthFeaturesRunlengthFeaturesrunlength_features

替代

smallest_rectangle1smallest_rectangle1SmallestRectangle1SmallestRectangle1SmallestRectangle1smallest_rectangle1, smallest_rectangle2smallest_rectangle2SmallestRectangle2SmallestRectangle2SmallestRectangle2smallest_rectangle2, region_featuresregion_featuresRegionFeaturesRegionFeaturesRegionFeaturesregion_features

另见

select_shapeselect_shapeSelectShapeSelectShapeSelectShapeselect_shape, smallest_circlesmallest_circleSmallestCircleSmallestCircleSmallestCirclesmallest_circle, elliptic_axiselliptic_axisEllipticAxisEllipticAxisEllipticAxiselliptic_axis, area_centerarea_centerAreaCenterAreaCenterAreaCenterarea_center

模块

Foundation