Halcon 算子 select_shape- 借助形状特征选择区域（选择轮廓）

Halcon 算子 select_shape- 借助形状特征选择区域（选择轮廓）

select_shape - 借助形状特征选择区域。

原型：

select_shape(Regions : SelectedRegions : Features, Operation, Min, Max : ) 

（将连接的区域进行筛选，筛选的特征有很多，如面积长度等，可以去掉不满足条件的轮廓）

描述：

操作符select_shape根据形状选择区域。对于来自区域的每个输入区域，计算所指示的特征（features）。如果计算特征的每个（Operation='and'）或至少一个（Operation='or'）在默认限制（最小值、最大值）内，则该区域将适应输出（复制）。

条件：Min_i <= Feature_i(Object) <= Max_i 

功能特征的取值：

特征	英	译	备注
area	Area of the object	对象的面积
row	Row index of the center	中心点的行坐标
column	Column index of the center	中心点的列坐标
width	Width of the region	区域的宽度
height	Height of the region	区域的高度
row1	Row index of upper left corner	左上角行坐标
column1	Column index of upper left corner	左上角列坐标
row2	Row index of lower right corner	右下角行坐标
column2	Column index of lower right corner	右下角列坐标
circularity	Circularity	圆度	0~1
compactness	Compactness	紧密度	0~1
contlength	Total length of contour	轮廓线总长
convexity	Convexity	凸性
rectangularity	Rectangularity	矩形度	0~1
ra	Main radius of the equivalent ellipse	等效椭圆长轴半径长度
rb	Secondary radius of the equivalent ellipse	等效椭圆短轴半径长度
phi	Orientation of the equivalent ellipse	等效椭圆方向
anisometry	Anisometry	椭圆参数，Ra/Rb长轴与短轴的比值
bulkiness	Bulkiness	椭圆参数，蓬松度π*Ra*Rb/A
struct_factor	Structur Factor	椭圆参数，Anisometry*Bulkiness-1
outer_radius	Radius of smallest surrounding circle	最小外接圆半径
inner_radius	Radius of largest inner circle	最大内接圆半径
inner_width	Width of the largest axis-parallel rectangle that fits into the region	最大内接矩形宽度
inner_height	Height of the largest axis-parallel rectangle that fits into the region	最大内接矩形高度
dist_mean	Mean distance from the region border to the center	区域边界到中心的平均距离
dist_deviation	Deviation of the distance from the region border from the center	区域边界到中心距离的偏差
roundness	Roundness	圆度，与circularity计算方法不同
num_sides	Number of polygon sides	多边形边数
connect_num	Number of connection components	连通数
holes_num	Number of holes	区域内洞数
area_holes	Area of the holes of the object	所有洞的面积
max_diameter	Maximum diameter of the region	最大直径
orientation	Orientation of the region	区域方向
euler_number	Euler number	欧拉数，即连通数和洞数的差
rect2_phi	Orientation of the smallest surrounding rectangle	最小外接矩形的方向
rect2_len1	Half the length of the smallest surrounding rectangle	最小外接矩形长度的一半？？	smallest_rectangle2
rect2_len2	Half the width of the smallest surrounding rectangle	最小外接矩形宽度的一半
moments_m11	Geometric moments of the region	几何矩
moments_m20	Geometric moments of the region	几何矩
moments_m02	Geometric moments of the region	几何矩
moments_ia	Geometric moments of the region	几何矩
moments_ib	Geometric moments of the region	几何矩
moments_m11_invar	Geometric moments of the region	几何矩
moments_m20_invar	Geometric moments of the region	几何矩
moments_m02_invar	Geometric moments of the region	几何矩
moments_phi1	Geometric moments of the region	几何矩
moments_phi2	Geometric moments of the region	几何矩
moments_m21	Geometric moments of the region	几何矩
moments_m12	Geometric moments of the region	几何矩
moments_m03	Geometric moments of the region	几何矩
moments_m30	Geometric moments of the region	几何矩
moments_m21_invar	Geometric moments of the region	几何矩
moments_m12_invar	Geometric moments of the region	几何矩
moments_m03_invar	Geometric moments of the region	几何矩
moments_m30_invar	Geometric moments of the region	几何矩
moments_i1	Geometric moments of the region	几何矩
moments_i2	Geometric moments of the region	几何矩
moments_i3	Geometric moments of the region	几何矩
moments_i4	Geometric moments of the region	几何矩
moments_psi1	Geometric moments of the region	几何矩
moments_psi2	Geometric moments of the region	几何矩
moments_psi3	Geometric moments of the region	几何矩
moments_psi4	Geometric moments of the region	几何矩

参数：

• Regions (input_object)  region-array → object     //要检查的区域
• SelectedRegions (output_object)  region-array → object   //符合条件的区域
• Features (input_control)  string(-array) → (string)   //要检查的形状特征
  • 默认值: 'area' 
  • 值列表: 'area', 'row', 'column', 'width', 'height', 'row1', 'column1', 'row2', 'column2', 'circularity', 'compactness', 'contlength', 'convexity', 'rectangularity', 'ra', 'rb', 'phi', 'anisometry', 'bulkiness', 'struct_factor', 'outer_radius', 'inner_radius', 'inner_width', 'inner_height', 'max_diameter', 'dist_mean', 'dist_deviation', 'roundness', 'num_sides', 'orientation', 'connect_num', 'holes_num', 'area_holes', 'euler_number', 'rect2_phi', 'rect2_len1', 'rect2_len2', 'moments_m11', 'moments_m20', 'moments_m02', 'moments_ia', 'moments_ib', 'moments_m11_invar', 'moments_m20_invar', 'moments_m02_invar', 'moments_phi1', 'moments_phi2', 'moments_m21', 'moments_m12', 'moments_m03', 'moments_m30', 'moments_m21_invar', 'moments_m12_invar', 'moments_m03_invar', 'moments_m30_invar', 'moments_i1', 'moments_i2', 'moments_i3', 'moments_i4', 'moments_psi1', 'moments_psi2', 'moments_psi3', 'moments_psi4' 
• Operation (input_control)  string → (string)    //单个特征的链接类型
  • 默认值: 'and' 
  • 值列表: 'and', 'or' 
• Min (input_control)  real(-array) → (real / integer / string)   //特征下限 ，最小值
  • 默认值: 150.0
  • 典型取值范围: 0.0 ≤ Min ≤ 99999.0
  • 最小增量: 0.001
  • 建议增量: 1.0 
• Max (input_control)  real(-array) → (real / integer / string)   //特征上限，最大值
  • 默认值: 99999.0
  • 典型取值范围: 0.0 ≤ Max ≤ 99999.0
  • 最小增量: 0.001
  • 建议增量: 1.0
  • 限制: Max >= Min   //Max必须大于等于Min  ，否则报错

示例：

read_image(Image,'monkey')
threshold(Image,S1,160,255)
connection(S1,S2)
select_shape(S2,Eyes,['area','anisometry'],'and',[500,1.0],[50000,1.7])
disp_region(Eyes,WindowHandle) 

　　

创建时间：2021.01.17　　更新时间：