Halcon算子--区域特征
当我们想要提取Region时，图像处理后，往往存在几个类似的Region，此时，需要根据Region的一些特殊特征，来选择指定的Region。
求Region指定特征值：region_features(Regions : : Features : Value)
根据特征值选择区域：select_shape(Regions : SelectedRegions : Features, Operation, Min, Max : )
Region特征一览：
特征英译备注
areaArea of the object对象的面积
rowRow index of the center中心点的行坐标
columnColumn index of the center中心点的列坐标
widthWidth of the region区域的宽度
heightHeight of the region区域的高度
row1Row index of upper left corner左上角行坐标
column1Column index of upper left corner左上角列坐标
row2Row index of lower right corner右下角行坐标
column2Column index of lower right corner右下角列坐标
circularityCircularity圆度0~1
compactnessCompactness紧密度0~1
contlengthTotal length of contour轮廓线总长
convexityConvexity凸性
rectangularityRectangularity矩形度0~1
raMain radius of the equivalent ellipse等效椭圆长轴半径长度
rbSecondary radius of the equivalent ellipse等效椭圆短轴半径长度
phiOrientation of the equivalent ellipse等效椭圆方向
anisometryAnisometry椭圆参数，Ra/Rb长轴与短轴的比值
bulkinessBulkiness椭圆参数，蓬松度π*Ra*Rb/A
struct_factorStructur Factor 椭圆参数，Anisometry*Bulkiness-1
outer_radiusRadius of smallest surrounding circle最小外接圆半径
inner_radiusRadius of largest inner circle最大内接圆半径
inner_widthWidth of the largest axis-parallel rectangle that fits into the region最大内接矩形宽度
inner_heightHeight of the largest axis-parallel rectangle that fits into the region最大内接矩形高度
dist_meanMean distance from the region border to the center区域边界到中心的平均距离
dist_deviationDeviation of the distance from the region border from the center区域边界到中心距离的偏差
roundnessRoundness圆度，与circularity计算方法不同
num_sidesNumber of polygon sides多边形边数
connect_numNumber of connection components连通数
holes_numNumber of holes区域内洞数
area_holesArea of the holes of the object所有洞的面积
max_diameterMaximum diameter of the region最大直径
orientationOrientation of the region区域方向
euler_numberEuler number欧拉数，即连通数和洞数的差
rect2_phiOrientation of the smallest surrounding rectangle最小外接矩形的方向
rect2_len1Half the length of the smallest surrounding rectangle最小外接矩形长度的一半？？smallest_rectangle2
rect2_len2Half the width of the smallest surrounding rectangle最小外接矩形宽度的一半