threshold_sub_pix(Segmentation/Threshold)
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一、效果一览
二、功能
用输入图像的阈值,提取平交路口(交通术语)——亚像素精度。
三、算子实例
read_image (Image, 'double_circle')dev_close_window ()get_image_size (Image, Width, Height)dev_open_window (0, 0, Width, Height, 'black', WindowHandle)threshold_sub_pix (Image, Edges, 128)segment_contours_xld (Edges, ContoursSplit, 'lines_circles', 5, 4, 3)count_obj (ContoursSplit, Number)dev_display (Image)dev_set_draw ('margin')dev_set_color ('red')dev_update_window ('off')for i := 1 to Number by 1 select_obj (ContoursSplit, ObjectSelected, i) get_contour_global_attrib_xld (ObjectSelected, 'cont_approx', Attrib) if (Attrib > 0) fit_circle_contour_xld (ObjectSelected, 'ahuber', -1, 2, 0, 3, 2, Row, Column, Radius, StartPhi, EndPhi, PointOrder) gen_ellipse_contour_xld (ContEllipse, Row, Column, 0, Radius, Radius, 0, 4 * acos(0), 'positive', 1.0) dev_display (ContEllipse) endifendfor
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