如何检测不同背景、螺丝的有无

如何能使用同一套算子来检测这两种螺丝的有

1. reduce_domain (img, region, ImageReduced)
   
2. mean_image (ImageReduced, ImageMean, 3, 3)
   
3. dyn_threshold (ImageReduced, ImageMean, RegionDynThresh, 5, 'light')
   
4. connection (RegionDynThresh, ConnectedRegions)
   
5. select_shape (ConnectedRegions, SelectedRegions, 'area', 'and', 150, 999999)
   
6. union1 (SelectedRegions, RegionUnion)
   
7. area_center (RegionUnion, area, Row, Column)

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这种方式能检测边缘的面积，可以设置阈值卡控，但总觉得还能做的更好