求助一个基本操作:筛选图中的暗区域

图中被框出的部分为较暗的目标区域，求助筛选思路

由于图像不均匀，且目标区域高为图像高度，小菜已无力
求助大佬指点，不胜感激

1. equ_histo_image (Image1, ImageEquHisto)
   
2. gray_opening_rect (ImageEquHisto, ImageOpening, 21, 5)
   
3. threshold (ImageOpening, Region, 0, 30)
   
4. fill_up (Region, RegionFillUp)
   
5. connection (RegionFillUp, ConnectedRegions)
   
6. select_shape_std (ConnectedRegions, SelectedRegions, 'max_area', 70)

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1. read_image (Image221822kpffm6rh6m6hmmks, 'C:/Users/Administrator/Desktop/221822kpffm6rh6m6hmmks.png')
   
2. scale_image_max (Image221822kpffm6rh6m6hmmks, ImageScaleMax)
   
3. median_image (ImageScaleMax, ImageMedian, 'circle', 11, 'mirrored')
   
4. mean_image (ImageMedian, ImageMean, 399, 299)
   
5. dyn_threshold (ImageMedian, ImageMean, RegionDynThresh, 3, 'dark')
   
6. connection (RegionDynThresh, ConnectedRegions)
   
7. select_shape_std (ConnectedRegions, SelectedRegions, 'max_area', 70)
   

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innerone82 发表于 2023-7-31 22:59

感谢，我测一下通用性

1. *尝试一种方法
   
2. gray_opening_shape (ImageResult, ImageOpening, 45, 7, 'rectangle')
   
3. gray_closing_shape (ImageOpening, ImageClosing, 3, 3, 'octagon')
   
4. mean_image (ImageClosing, ImageSmooth, 3, 3)
   
5. mean_image (ImageClosing, ImageSmooth1, 455, 11)
   
6. dyn_threshold (ImageSmooth, ImageSmooth1, RegionDynThresh, 7, 'dark')
   
7. opening_circle (RegionDynThresh, RegionOpening, 3.5)
   
8. closing_circle (RegionOpening, RegionClosing, 3.5)
   
9. connection (RegionClosing, ConnectedRegions1)
   
10. select_shape (ConnectedRegions1, SelectedRegions2, 'area', 'and', 4000, 999999)

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测试结果

halcon2016 发表于 2023-8-1 08:58

感谢大佬，
请教一下这里的中值滤波是怎么考虑的，基本上没用过中值滤波
同时如果有多个目标区域如何考虑，感觉指导

freekun139com 发表于 2023-8-1 09:40
感谢大佬，
请教一下这里的中值滤波是怎么考虑的，基本上没用过中值滤波
同时如果有多个目标区域如何考虑 ...

如果图像中有很多孤立离散的点，可以考虑中值滤波，多个目标区域最后筛选的时候就不用最大值筛选 ，而是筛选面积符合一定要求的区域