When I was studying Halcon software,I was too poor to buy some tutorials.So,here is one of my best explanation of one wonderful example, which is universal for many circumstances.plz enjoy the codes!

￥￥$$￥￥（可以拿来工整棋盘）例：如何用xld的投影变换，将照片中的四边形（足球场）工整地展示出来
...............................................................................................\(待确认)（椭圆方向）我的洞察：椭圆方向由长半轴决定，长半（主）轴最左的端点到最右的端点的方向即是。（故phi的取值范围应该是-90°到+90°）-（注意主轴垂直的情况±90°都可以，我觉得该取默认90°！）.txt
...............................................................................................\QQ截图20160523111211.jpg
...............................................................................................\QQ截图20160523232949.jpg
...............................................................................................\bundary算子.jpg
...............................................................................................\dev_set_colored 和dev_set_color区别：一个填数字，一个填颜色.jpg
...............................................................................................\dev_set_window_extents().jpg
...............................................................................................\fit_line_contour_xld算子---文中line segment=线段.jpg
...............................................................................................\fit_line_contour_xld补充.jpg
...............................................................................................\intersection_lines（）算子.jpg
...............................................................................................\regress_contour_xld.jpg
...............................................................................................\sort_index().jpg
...............................................................................................\vector_to_proj_hom_mat2d.hdev
...............................................................................................\（自己总结，仅仅对此例子来说）xy坐标系与窗口宽高（横Col纵Row）的关系及vector_to_proj_hom_mat2d（）的四个顶点的排列排列方向.jpg
...............................................................................................\￥￥￥$$$￥￥￥select_shape_xld( phi_points )筛选方向的宝贵经验.jpg

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