【halcon案例】inspect_bga.hdev测量bga焊点缺陷

最新推荐文章于 2025-05-06 15:41:26 发布

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最新推荐文章于 2025-05-06 15:41:26 发布

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文章标签：图像处理

本文链接：https://blog.youkuaiyun.com/qq_42831621/article/details/145076662

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思路：
提取OK焊点，建立模板。
将模板映射到每次来料焊点，计算相邻两焊点之间的距离。
通过距离、各项异性(‘anisometry）、灰度值，筛选出NG的焊点区域。
模板图片

模板点位示意图
NG图片
NG点位示意图
提取焊点region：

fast_threshold (Image, Region, 95, 255, 3)
connection (Region, ConnectedRegions)
select_shape (ConnectedRegions, SelectedRegions, ['area','anisometry'], 'and', [20,1.0], [100,1.7])
dilation_rectangle1 (SelectedRegions, RegionDilation, 3, 3)

计算每个焊点特征（灰度值、长宽比）：

area_center_gray (RegionDilation, Image, VolumeCheck, RowCheck, ColumnCheck)
elliptic_axis_gray (RegionDilation, Image, RaCheck, RbCheck, PhiCheck)
AnisometryCheck := RaCheck / RbCheck

刚性变换消除角度，建立模板：

gen_region_points (RegionBGACenters, RowCheck, ColumnCheck)
smallest_rectangle2 (RegionBGACenters, RowBGACheck, ColumnBGACheck, PhiBGACheck, Length1BGACheck, Length2BGACheck)
if (VisualizeIntermediate)
    dev_display (Image)
    dev_set_color ('red')
    dev_display (RegionBGACenters)
    dev_set_color ('green')
    dev_set_draw ('margin')
    gen_rectangle2 (BGARect, RowBGACheck, ColumnBGACheck, PhiBGACheck, Length1BGACheck, Length2BGACheck)
    dev_display (BGARect)
    dev_set_draw ('fill')
endif
* 
* 2D transformation and normalization of the center points
* 
BallDistCol := 2 * Length1BGACheck / (BallsPerCol - 1)
BallDistRow := 2 * Length2BGACheck / (BallsPerRow - 1)
hom_mat2d_identity (HomMat2DIdentity)
hom_mat2d_rotate (HomMat2DIdentity, -PhiBGACheck, RowBGACheck, ColumnBGACheck, HomMat2DRotate)
hom_mat2d_translate (HomMat2DRotate, -RowBGACheck + Length2BGACheck, -ColumnBGACheck + Length1BGACheck, HomMat2DTranslate)
hom_mat2d_scale (HomMat2DTranslate, 1 / BallDistRow, 1 / BallDistCol, 0, 0, HomMat2DScale)
affine_trans_point_2d (HomMat2DScale, RowCheck, ColumnCheck, RowNormalized, ColNormalized)
BGARowIndex := round(RowNormalized)
BGAColIndex := round(ColNormalized)
NumBalls := |RowCheck|

构建来料焊点与模板点位的刚性变换矩阵：

vector_to_rigid (Rows1, Cols1, Rows2, Cols2, HomMat2D)

将模板点位映射到来料上：

affine_trans_point_2d (HomMat2D, Rows1, Cols1, RowTrans, ColumnTrans)

筛选出NG区域：

for i := 0 to BallsPerRow * BallsPerCol - 1 by 1
    if (BallMatrix[i] >= 0 and BallMatrixCheck[i] >= 0)
        gen_ellipse (Ellipse, Rows2[j], Cols2[j], Phi2[j], Ra2[j], Rb2[j])
        if (Distance[j] > 0.05)
            concat_obj (EllipseDeviation, Ellipse, EllipseDeviation)
        else
            if (Anisometry2[j] > 1.2)
                concat_obj (EllipseDeformation, Ellipse, EllipseDeformation)
            else
                if (Volume2[j] < 5500 or Volume2[j] > 10000)
                    concat_obj (EllipseVolume, Ellipse, EllipseVolume)
                else
                    concat_obj (EllipseCorrect, Ellipse, EllipseCorrect)
                endif
            endif
        endif
        j := j + 1
    else
        if (BallMatrix[i] >= 0)
            gen_cross_contour_xld (Cross, RowTransFull[BallMatrix[i]], ColumnTransFull[BallMatrix[i]], 10, 0.785398)
            concat_obj (Missing, Cross, Missing)
        endif
    endif
endfor