polar_trans_region_invpolar_trans_region_invPolarTransRegionInvPolarTransRegionInvpolar_trans_region_inv (算子)

名称

polar_trans_region_invpolar_trans_region_invPolarTransRegionInvPolarTransRegionInvpolar_trans_region_inv — 将极坐标系中的区域变换回笛卡尔坐标系。

签名

描述

polar_trans_region_invpolar_trans_region_invPolarTransRegionInvPolarTransRegionInvPolarTransRegionInvpolar_trans_region_inv transforms the polar coordinate representation of a region, stored in PolarRegionPolarRegionPolarRegionPolarRegionpolarRegionpolar_region, back onto an annular arc in Cartesian coordinates, described by the radii RadiusStartRadiusStartRadiusStartRadiusStartradiusStartradius_start and RadiusEndRadiusEndRadiusEndRadiusEndradiusEndradius_end and the angles AngleStartAngleStartAngleStartAngleStartangleStartangle_start and AngleEndAngleEndAngleEndAngleEndangleEndangle_end with the center point located at (RowRowRowRowrowrow, ColumnColumnColumnColumncolumncolumn). All of these values can be chosen as real numbers. In addition, the dimensions of the virtual image containing the region PolarRegionPolarRegionPolarRegionPolarRegionpolarRegionpolar_region must be given in WidthInWidthInWidthInWidthInwidthInwidth_in and HeightInHeightInHeightInHeightInheightInheight_in. WidthInWidthInWidthInWidthInwidthInwidth_in-1 is the column coordinate corresponding to AngleEndAngleEndAngleEndAngleEndangleEndangle_end and HeightInHeightInHeightInHeightInheightInheight_in-1 is the row coordinate corresponding to RadiusEndRadiusEndRadiusEndRadiusEndradiusEndradius_end. AngleStartAngleStartAngleStartAngleStartangleStartangle_start and RadiusStartRadiusStartRadiusStartRadiusStartradiusStartradius_start correspond to column and row coordinate 0. Furthermore, the dimensions WidthWidthWidthWidthwidthwidth and HeightHeightHeightHeightheightheight of the virtual output image containing the transformed region XYTransRegionXYTransRegionXYTransRegionXYTransRegionXYTransRegionxytrans_region are required.

The angles and radii are inclusive, which means that the row coordinate 0 in PolarRegionPolarRegionPolarRegionPolarRegionpolarRegionpolar_region will be mapped onto a a circle with a distance of RadiusStartRadiusStartRadiusStartRadiusStartradiusStartradius_start pixels from the specified center and the row with the coordinate HeightInHeightInHeightInHeightInheightInheight_in-1 will be mapped onto a circle of radius RadiusEndRadiusEndRadiusEndRadiusEndradiusEndradius_end. This applies to AngleStartAngleStartAngleStartAngleStartangleStartangle_start, AngleEndAngleEndAngleEndAngleEndangleEndangle_end, and WidthInWidthInWidthInWidthInwidthInwidth_in in an analogous way. If the width of the input region PolarRegionPolarRegionPolarRegionPolarRegionpolarRegionpolar_region corresponds to an angle interval greater than 2pi, the region is cropped such that length of this interval is 2pi.

The parameter InterpolationInterpolationInterpolationInterpolationinterpolationinterpolation is used to select the interpolation method 'bilinear'"bilinear""bilinear""bilinear""bilinear""bilinear" or 'nearest_neighbor'"nearest_neighbor""nearest_neighbor""nearest_neighbor""nearest_neighbor""nearest_neighbor". Setting InterpolationInterpolationInterpolationInterpolationinterpolationinterpolation to 'bilinear'"bilinear""bilinear""bilinear""bilinear""bilinear" leads to smoother region boundaries, especially if regions are enlarged. However, the runtime increases significantly.

polar_trans_region_invpolar_trans_region_invPolarTransRegionInvPolarTransRegionInvPolarTransRegionInvpolar_trans_region_inv is the inverse function of polar_trans_regionpolar_trans_regionPolarTransRegionPolarTransRegionPolarTransRegionpolar_trans_region。

The call sequence: returns the region RegionRegionRegionRegionregionregion, restricted to the circle around (RowRowRowRowrowrow, ColumnColumnColumnColumncolumncolumn) with radius RadiusRadiusRadiusRadiusradiusradius, as its output region XYTransRegionXYTransRegionXYTransRegionXYTransRegionXYTransRegionxytrans_region.

If more than one region is passed in PolarRegionPolarRegionPolarRegionPolarRegionpolarRegionpolar_region, their Cartesian transformations are computed individually and stored as a tuple in XYTransRegionXYTransRegionXYTransRegionXYTransRegionXYTransRegionxytrans_region. Please note that the indices of an input region and its transformation only correspond if the system variable 'store_empty_regions'"store_empty_regions""store_empty_regions""store_empty_regions""store_empty_regions""store_empty_regions" is set to 'false'"false""false""false""false""false" (see set_systemset_systemSetSystemSetSystemSetSystemset_system). Otherwise empty output regions are discarded and the length of the input tuple PolarRegionPolarRegionPolarRegionPolarRegionpolarRegionpolar_region is most likely not equal to the length of the output tuple XYTransRegionXYTransRegionXYTransRegionXYTransRegionXYTransRegionxytrans_region。

更多信息

有关 HALCON 中使用的不同二维坐标系的说明，请参阅 变换 / 二维变换 一章的引言。

注意

If WidthWidthWidthWidthwidthwidth or HeightHeightHeightHeightheightheight are chosen greater than the dimensions of the current image, the system variable 'clip_region'"clip_region""clip_region""clip_region""clip_region""clip_region" should be set to 'false'"false""false""false""false""false" (see set_systemset_systemSetSystemSetSystemSetSystemset_system). Otherwise, an output region that does not lie within the dimensions of the current image can produce an error message.

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。
• 在内部数据级别上自动并行化。

参数

另见

polar_trans_image_extpolar_trans_image_extPolarTransImageExtPolarTransImageExtPolarTransImageExtpolar_trans_image_ext, polar_trans_image_invpolar_trans_image_invPolarTransImageInvPolarTransImageInvPolarTransImageInvpolar_trans_image_inv, polar_trans_regionpolar_trans_regionPolarTransRegionPolarTransRegionPolarTransRegionpolar_trans_region, polar_trans_contour_xldpolar_trans_contour_xldPolarTransContourXldPolarTransContourXldPolarTransContourXldpolar_trans_contour_xld, polar_trans_contour_xld_invpolar_trans_contour_xld_invPolarTransContourXldInvPolarTransContourXldInvPolarTransContourXldInvpolar_trans_contour_xld_inv

模块

基础

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