Halcon入门基础——7、select_shape

select_shape(Regions : SelectedRegions : Features, Operation, Min, Max : )
用于筛选目标区域
筛选依据是Features，即区域的特征；
区域的特征非常多：
‘anisometry’, ‘area’, ‘area_holes’, ‘bulkiness’, ‘circularity’, ‘column’, ‘column1’, ‘column2’, ‘compactness’, ‘connect_num’, ‘contlength’, ‘convexity’, ‘dist_deviation’, ‘dist_mean’, ‘euler_number’, ‘height’, ‘holes_num’, ‘inner_height’, ‘inner_radius’, ‘inner_width’, ‘max_diameter’, ‘moments_i1’, ‘moments_i2’, ‘moments_i3’, ‘moments_i4’, ‘moments_ia’, ‘moments_ib’, ‘moments_m02’, ‘moments_m02_invar’, ‘moments_m03’, ‘moments_m03_invar’, ‘moments_m11’, ‘moments_m11_invar’, ‘moments_m12’, ‘moments_m12_invar’, ‘moments_m20’, ‘moments_m20_invar’, ‘moments_m21’, ‘moments_m21_invar’, ‘moments_m30’, ‘moments_m30_invar’, ‘moments_phi1’, ‘moments_phi2’, ‘moments_psi1’, ‘moments_psi2’, ‘moments_psi3’, ‘moments_psi4’, ‘num_sides’, ‘orientation’, ‘outer_radius’, ‘phi’, ‘ra’, ‘ratio’, ‘rb’, ‘rect2_len1’, ‘rect2_len2’, ‘rect2_phi’, ‘rect