halcon17的找线功能其实是对之前halcon10版本找线方法的封装。
勇哥下面这几篇文章介绍了halcon10版本的找线方法，你会发现，halcon17的找线算子的参数其实跟这篇文章介绍的差不多的。
Halcon学习（27-2）halcon测量技术：找线
带ROI跟随的找边测试代码（halcon代码演示）
经过封装后的找线算子，还是非常好用的，你只需要给定找线的起始与终止点即可。
演示代码如下：
read_image (Image, 'G:/pic2/8.bmp')
set_draw (200000, 'margin')
create_metrology_model (MetrologyHandle)
get_image_size (Image, Width, Height)
set_metrology_model_image_size (MetrologyHandle, Width, Height)
add_metrology_object_line_measure (MetrologyHandle, 677, 555, 620, 2050, 50, 5, 1, 30, [], [], Index)
set_metrology_object_param (MetrologyHandle, 'all', 'measure_transition', 'all')
set_metrology_object_param (MetrologyHandle, 'all', 'measure_select','all')
set_metrology_object_param (MetrologyHandle, 'all', 'measure_threshold', 30)
set_metrology_object_param (MetrologyHandle, 'all', 'measure_sigma', 1)
set_metrology_object_param (MetrologyHandle, 'all', 'measure_length1', 50)
set_metrology_object_param (MetrologyHandle, 'all', 'measure_length2', 5)
set_metrology_object_param (MetrologyHandle, 'all', 'num_measures', 50)
set_metrology_object_param (MetrologyHandle, 'all', 'min_score' ,0.4)
apply_metrology_model (Image, MetrologyHandle)
get_metrology_object_measures (Contours, MetrologyHandle, 'all', 'all', Row6, Column6)
get_metrology_object_result (MetrologyHandle, 'all', 'all', 'result_type', 'all_param', Parameter)
get_metrology_object_result_contour (Contour, MetrologyHandle, 'all', 'all', 1.5)
dev_set_color('red')
if(|Parameter|>0)
startR1:=Parameter[0]
startC1:=Parameter[1]
endR1:=Parameter[2]
endC1:=Parameter[3]
disp_line (200000, startR1, startC1, endR1, endC1)
endif
clear_metrology_model(MetrologyHandle)
stop()注意程序最后那句
clear_metrology_model(MetrologyHandle)
如果没有它，你的程序导入C#运行时，会发现跑不多久内存泄露会达到几个G，很是壮观。
找线参数中, 几个常见的参数如下：
measure_transition取值： positive, negative, all （即找线的方式：从黑到白，从白到黑）
measure_select取值：all, first,best,last
Thresold 最小边缘幅度
Sigma 高斯光滑系数
num_measures测量点的数量
measure_length1 测量框长度
measure_length2 测量框宽度
min_score 最小分数
运行效果如下图：
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作者：hackpig
来源：www.skcircle.com
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