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# ISO 16610-85:2013 pdf free

ISO 16610-85:2013 pdf free.Geometrical product specifications (GPS)一Filtration
The watershed method consists of gradually filling insignificant dales with water. The water will eventually flow out of each dale, at a saddle point, into an adjacent dale. If that dale is significant combine the two dales. Otherwise continue to fill the new lake until the water flows into a significant dale; All the filld insignificant dales are then combined with the significant dale. By inverting the landscape so hills become dales, et., a similar process will establish the combination of insignificant hills to significant hills.
For this part of ISO 16610, the set of events shall consist of areal features and the combination rule shall consist of the watershed method. Segmentation that uses the watershed method as the combination rule is called watershed segmentation.
continuously varying with height. Saddle points are represented by the merging of two or more of these lines into one, peaks and pits are represented by the termination of a line.
NOTE 1 Change trees are a useful way to organize the relationships between topological features in hills and dales and still retain relevant information.
NOTE 2 Kweon and Kanade[11] introduced the concept of a change tree to describe the connectability of a surface.
NOTE 3 Change trees are one example of a more general topological object called a Reeb Graph.[15]
NOTE 4 There is a close connection between the watershed method and the change tree in that the watershed method can be used to calculate the change tree. Again consider filling a dale gradually with water. The point where the water first flows out of the dale is a saddle point. The pit in the dale is connected to this saddle point in the change tree. Continuing to fill the new lake, the next point where the water flows out of the lake is also a saddle point. Again the line on the change tree, representing the contour of the lake shoreline, will be connected to this saddle point in the change tree. This process can be continued and establishes the connection between the pits, saddle points and the change tree. By inverting the landscape so hills become dales, etc., a similar process will establish the connection between peaks, saddle points and the change tree.ISO 16610-85 pdf free download.

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