# Extraction and fusion of connected domains

**URL:** <https://discourse.vtk.org/t/extraction-and-fusion-of-connected-domains/6781>\
**Category:** Development\
**Created:** [October 8, 2021, 6:29am UTC](https://discourse.vtk.org/t/extraction-and-fusion-of-connected-domains/6781 "2021-10-08T06:29:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![buyierfei](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/b/9fc29f/32.png) [@buyierfei](https://discourse.vtk.org/u/buyierfei)\
**Post date:** [October 8, 2021, 6:29am UTC](https://discourse.vtk.org/t/extraction-and-fusion-of-connected-domains/6781/1 "2021-10-08T06:29:18Z")

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After analyzing the connected domain of a 3D volume data, several labeled connected domains are obtained. How to obtain the volume data of the corresponding connected domain through the label? What should I do if I want to extract and merge two of the connected domains?