# Some questions about the vision inspection project
**URL:** https://forums.openmv.io/t/some-questions-about-the-vision-inspection-project/1678
**Category:** OpenMV Boards
**Created:** [March 12, 2020, 6:58am UTC](https://forums.openmv.io/t/some-questions-about-the-vision-inspection-project/1678 "2020-03-12T06:58:03Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@FenomenoK](https://forums.openmv.io/u/FenomenoK)
#### Post date: [March 12, 2020, 6:58am UTC](https://forums.openmv.io/t/some-questions-about-the-vision-inspection-project/1678/1 "2020-03-12T06:58:03Z")
Try to detect the red rectangular part of the picture.
But I am poor at using openmv tools.
Please give me some tips on how to proceed with this project.
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### Author:  [@iabdalkader](https://forums.openmv.io/u/iabdalkader)
#### Post date: [March 12, 2020, 10:39am UTC](https://forums.openmv.io/t/some-questions-about-the-vision-inspection-project/1678/2 "2020-03-12T10:39:12Z")
Hi, you could use find\_blobs and the threshold editor to find the color the rectangle.
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### Author:  [@FenomenoK](https://forums.openmv.io/u/FenomenoK)
#### Post date: [March 16, 2020, 12:16am UTC](https://forums.openmv.io/t/some-questions-about-the-vision-inspection-project/1678/3 "2020-03-16T00:16:01Z")
> [@](#):
>
> Hi, you could use find\_blobs and the threshold editor to find the color the rectangle.
When using find\_blobs (), is it not possible to set two roi?
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### Author:  [@iabdalkader](https://forums.openmv.io/u/iabdalkader)
#### Post date: [March 16, 2020, 12:35am UTC](https://forums.openmv.io/t/some-questions-about-the-vision-inspection-project/1678/4 "2020-03-16T00:35:06Z")
No, a single ROI.
[http://docs.openmv.io/library/omv.image.html?highlight=find\_blobs#image.image.find\_blobs](http://docs.openmv.io/library/omv.image.html?highlight=find_blobs#image.image.find_blobs)