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oPEncv RetrievalModes
enum RetrievalModes { /** retrieves only the extreme outer contours. IT sets `hierArchy[i][2]=hierarchy[i][3]=-1` for all the contours. */ RETR_EXTERNAL = 0, /** retrieves all of the contours without establishing any hierarchical relationships. */ RETR_LIST = 1, /** retrieves all of the contours and organizes them into a two-level hierarchy. At the top level, there are external boundaries of the components. At the second level, there are boundaries of the holes. If there is another contour inside a hole of a connected component, it is still put at the top level. */ RETR_CCOMP = 2, /** retrieves all of the contours and reconstructs a full hierarchy of nested contours.*/ RETR_TREE = 3, RETR_FLOODFILL = 4 //!< };
代码参考:opencv3.3opencvbuildincludeopencv2imgPRoc.hpp
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