projective_trans_regionT_projective_trans_regionProjectiveTransRegionProjectiveTransRegionprojective_trans_region (算子)

名称

projective_trans_regionT_projective_trans_regionProjectiveTransRegionProjectiveTransRegionprojective_trans_region — 对区域应用投影变换。

签名

描述

projective_trans_regionprojective_trans_regionProjectiveTransRegionProjectiveTransRegionProjectiveTransRegionprojective_trans_region applies the projective transformation specified by the homogeneous matrix HomMat2DHomMat2DHomMat2DHomMat2DhomMat2Dhom_mat_2d on the regions in RegionsRegionsRegionsRegionsregionsregions and returns the transformed regions in TransRegionsTransRegionsTransRegionsTransRegionstransRegionstrans_regions。

For creation and interpretation details of this matrix see also projective_trans_imageprojective_trans_imageProjectiveTransImageProjectiveTransImageProjectiveTransImageprojective_trans_image。

If 'clip_region'"clip_region""clip_region""clip_region""clip_region""clip_region" is set to its default value 'true'"true""true""true""true""true" by set_system('clip_region', 'true')set_system("clip_region", "true")SetSystem("clip_region", "true")SetSystem("clip_region", "true")SetSystem("clip_region", "true")set_system("clip_region", "true") or if the transformation is degenerated and thus produces infinite regions, the output region is clipped by the rectangle with upper left corner (0, 0) and lower right corner ('width'"width""width""width""width""width", 'height'"height""height""height""height""height"), where 'width'"width""width""width""width""width" and 'height'"height""height""height""height""height" are system variables (see also get_systemget_systemGetSystemGetSystemGetSystemget_system). If 'clip_region'"clip_region""clip_region""clip_region""clip_region""clip_region" is 'false'"false""false""false""false""false", the output region is not clipped except by the maximum supported coordinate size 'MAX_FORMAT'"MAX_FORMAT""MAX_FORMAT""MAX_FORMAT""MAX_FORMAT""MAX_FORMAT". This may result in extremely memory and time intensive computations, so use with care.

注意

The used coordinate system is the same as in affine_trans_pixelaffine_trans_pixelAffineTransPixelAffineTransPixelAffineTransPixelaffine_trans_pixel。This means that in fact not HomMat2DHomMat2DHomMat2DHomMat2DhomMat2Dhom_mat_2d is applied but a modified version. Therefore, applying projective_trans_regionprojective_trans_regionProjectiveTransRegionProjectiveTransRegionProjectiveTransRegionprojective_trans_region corresponds to the following chain of transformations, which is applied to each point of the region (input and output pixels as homogeneous vectors):

因此，当基于区域派生的坐标（例如通过 area_centerarea_centerAreaCenterAreaCenterAreaCenterarea_center 等算子）创建投影变换时，可能会得到意外的结果。例如，若使用此算子计算旋转对称区域的重心，随后通过 hom_mat2d_rotatehom_mat2d_rotateHomMat2dRotateHomMat2dRotateHomMat2dRotatehom_mat2d_rotate 围绕该点旋转该区域，则旋转后的区域将不会位于原始区域之上。在这种情况下，您可以在将 HomMat2DHomMat2DHomMat2DHomMat2DhomMat2Dhom_mat_2d 用于 projective_trans_regionprojective_trans_regionProjectiveTransRegionProjectiveTransRegionProjectiveTransRegionprojective_trans_region 之前，通过应用以下变换来补偿这种影响：

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。

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

可能的前趋

vector_to_proj_hom_mat2dvector_to_proj_hom_mat2dVectorToProjHomMat2dVectorToProjHomMat2dVectorToProjHomMat2dvector_to_proj_hom_mat2d, hom_vector_to_proj_hom_mat2dhom_vector_to_proj_hom_mat2dHomVectorToProjHomMat2dHomVectorToProjHomMat2dHomVectorToProjHomMat2dhom_vector_to_proj_hom_mat2d, proj_match_points_ransacproj_match_points_ransacProjMatchPointsRansacProjMatchPointsRansacProjMatchPointsRansacproj_match_points_ransac, proj_match_points_ransac_guidedproj_match_points_ransac_guidedProjMatchPointsRansacGuidedProjMatchPointsRansacGuidedProjMatchPointsRansacGuidedproj_match_points_ransac_guided, hom_mat3d_projecthom_mat3d_projectHomMat3dProjectHomMat3dProjectHomMat3dProjecthom_mat3d_project

另见

projective_trans_imageprojective_trans_imageProjectiveTransImageProjectiveTransImageProjectiveTransImageprojective_trans_image, projective_trans_image_sizeprojective_trans_image_sizeProjectiveTransImageSizeProjectiveTransImageSizeProjectiveTransImageSizeprojective_trans_image_size, projective_trans_contour_xldprojective_trans_contour_xldProjectiveTransContourXldProjectiveTransContourXldProjectiveTransContourXldprojective_trans_contour_xld, projective_trans_point_2dprojective_trans_point_2dProjectiveTransPoint2dProjectiveTransPoint2dProjectiveTransPoint2dprojective_trans_point_2d, projective_trans_pixelprojective_trans_pixelProjectiveTransPixelProjectiveTransPixelProjectiveTransPixelprojective_trans_pixel

模块

基础

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