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# System prepended metadata

title: 5.1 Combining Fractured Grains

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# 5.1 Combining Fractured Grains

Here is our optical image:
![](https://i.imgur.com/0ZSS4iu.jpg)

In optical image, it is obvious that some grains are with stripes on their surface. These stripes may mislead the watershed segmentation by seperating a grain into several segmentation. In this case, users need to use red marker to combine these segments.

- Let's take this grain for example
![](https://i.imgur.com/csm8tyz.jpg)

- After initial segmentation, the grain is segmented into several pieces.
![](https://i.imgur.com/RNWszmz.jpg)

- In this case, we recommend users to briefly fill up the whole grain with red marker. (Turn off "Segment Overlay")
![](https://i.imgur.com/eW4PmAw.jpg)


- Then these segments will merge together
![](https://i.imgur.com/HuxED1O.jpg)

- Finally, let's seperate the other grains from this segment by drawing red marker on the other grains and clicking "ReSegment".
![](https://i.imgur.com/ztBNasa.jpg)
(Turn off "Marker Overlay")
![](https://i.imgur.com/I5GV2d7.jpg)

