In mathematical morphology, opening is the dilation of the erosion of a set A by a structuring element B: ∘ = (⊖) ⊕, where ⊖ and ⊕ denote erosion and dilation, respectively.. Together with closing, the opening serves in computer vision and image processing as a basic workhorse of morphological noise removal. Opening removes small objects from the foreground (usually taken as the ... More @Wikipedia
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