halcon-disp_xld.hdev

* Display an XLD object.
* 
read_image (Image, 'mreut')
dev_close_window ()
dev_open_window (0, 0, 512, 512, 'black', WindowID)
* Extract edges subpixel precisely using Deriche filter
edges_sub_pix (Image, Edges, 'mderiche2', 0.7, 10, 20)

edges_image (Image, ImaAmp, ImaDir, 'mderiche2', 0.7, 'nms', 10, 20)
threshold (ImaAmp, Region, 1, 255)
gen_contours_skeleton_xld (Region, Contours, 1, 'filter')

dev_clear_window ()
* Measure the runtime to dispay xlds
count_seconds (Seconds1)
disp_xld (Edges, WindowID)
count_seconds (Seconds2)
Time1 := Seconds2-Seconds1

dev_clear_window ()
count_seconds (Seconds1)
disp_xld (Contours, WindowID)
count_seconds (Seconds2)
Time2 := Seconds2-Seconds1

 基本步骤：
1.读取灰度图像
2.edges_sub_pix，取得亚像素精度边缘

或
1.读取灰度图像
2.edges_image，取得边缘
3.threshold，变成二值图像
4.gen_contours_skeleton_xld，产生亚像素精度边缘