背景：当镜头不是远心镜头时，FA镜头没法知道一个像素的尺寸。

1、标定板信息

标定板7*7，圆的直径是1.25mm，两个圆的距离是2.5mm，求出每排两两圆心距的像素距离，然后平均值。两点的真实距离为D，像素距离为d,这时x方向像素当量 距离=D/d;同理求y方向的像素当量的距离。

2、halcon求x方向像素当量的方法

read_image (Image, 'C:/Users/tingjie_xu/Desktop/BD1.bmp')
rgb1_to_gray(Image,Cal)*将标定板上的圆点区域抠图
threshold (Cal, Regions, 0,100)
connection (Regions, ConnectedRegions)
select_shape (ConnectedRegions, SelectedRegions1, 'area', 'and', 3500, 5000)
fill_up (SelectedRegions1, RegionFillUp)
select_shape (RegionFillUp, SelectedRegions2, 'roundness', 'and', 0.73303, 1)union1 (SelectedRegions2, RegionUnion)
shape_trans (RegionUnion, RegionTrans, 'convex')inner_rectangle1 (RegionTrans, Row1, Column1, Row2, Column2)
gen_rectangle1 (Rectangle, Row1, Column1, Row2, Column2)
dilation_rectangle1 (Rectangle, RegionDilation, 200, 200)
reduce_domain (Cal, RegionDilation, ImageReduced)*计算圆点所构成的区域的长和宽
threshold (ImageReduced, Regions, 0, 100)
connection (Regions, ConnectedRegions)
select_shape (ConnectedRegions, SelectedRegions1, 'area', 'and', 3500, 5000)
fill_up (SelectedRegions1, RegionFillUp)
select_shape (RegionFillUp, SelectedRegions2, 'roundness', 'and', 0.73303, 1)sort_region (SelectedRegions2, SortedRegions, 'character', 'true', 'row')count_obj (SortedRegions, PointNum)
colNum:=7
RowNum:=PointNum/colNumunion1 (SortedRegions, RegionUnion)
smallest_rectangle2 (RegionUnion, Row, Column, Phi, Length1, Length2)i:=0for Index_I := 0 to colNum-1 by 1for Index_J := 1 to RowNum by 1if(Index_J+1<=RowNum)select_obj(SortedRegions, ObjectSelected1, Index_J+Index_I*7)  select_obj(SortedRegions, ObjectSelected2, Index_J+1+Index_I*7)  gen_contour_region_xld(ObjectSelected1,Contours1, 'border') gen_contour_region_xld(ObjectSelected2,Contours2, 'border') *gen_contour_region_xld(ObjectSelected,Contours, 'border')fit_circle_contour_xld (Contours1, 'algebraic', -1, 0, 0, 3, 2, Row11, Column11, Radius11, StartPhi11, EndPhi11, PointOrder11)   gen_circle_contour_xld(ContCircle1, Row11, Column11, Radius11, 0, 6.28318, 'positive', 1)fit_circle_contour_xld (Contours2, 'algebraic', -1, 0, 0, 3, 2, Row22, Column22, Radius22, StartPhi22, EndPhi22, PointOrder22)   gen_circle_contour_xld(ContCircle2, Row22, Column22, Radius22, 0, 6.28318, 'positive', 1)           distance_pp(Row11, Column11, Row22, Column22, Distance)if(Distance!=0)pix[i]:=2.5/Distancei:=i+1endifendifendforendfortuple_mean( pix,Mean)  dev_display (Cal)
dev_display (RegionUnion)