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![1](drex_bullet_1.png) Erosion
The filter assigns minimum value of surrounding pixels to each pixel of the result image.
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![2](drex_bullet_2.png) Dilatation
The filter assigns maximum value of surrounding pixels to each pixel of the result image.
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![3](drex_bullet_3.png) Opening
Opening morphology operator equals to erosion followed by dilatation.
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![4](drex_bullet_4.png) Closing
Closing morphology operator equals to dilatation followed by erosion.
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![5](drex_bullet_5.png) Custom
Custom.
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![6](drex_bullet_6.png) Hit and miss, thickening, thinning
The hit-and-miss filter represents generalization of Erosion and Dilatation filters by extending flexibility of structuring elements and providing different modes of its work.
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