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41 lines
1.7 KiB
Markdown
41 lines
1.7 KiB
Markdown
---
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title: 'OpenCV tools'
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linkTitle: 'OpenCV tools'
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weight: 14
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---
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The tool based on [Open CV](https://opencv.org/) Computer Vision library
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which is an open-source product that includes many CV algorithms.
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Some of these algorithms can be used to simplify the annotation process.
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First step to work with OpenCV is to load it into CVAT. Click on the toolbar icon, then click `Load OpenCV`.
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Once it is loaded, the tool's functionality will be available.
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### Intelligent scissors
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Intelligent scissors is an CV method of creating a polygon
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by placing points with automatic drawing of a line between them.
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The distance between the adjacent points is limited by the threshold of action,
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displayed as a red square which is tied to the cursor.
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- First, select the label and then click on the `intelligent scissors` button.
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- Create the first point on the boundary of the allocated object.
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You will see a line repeating the outline of the object.
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- Place the second point, so that the previous point is within the restrictive threshold.
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After that a line repeating the object boundary will be automatically created between the points.
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To increase or lower the action threshold, hold `Ctrl` and scroll the mouse wheel.
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Increasing action threshold will affect the performance.
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During the drawing process you can remove the last point by clicking on it with the left mouse button.
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- Once all the points are placed, you can complete the creation of the object by clicking on the icon or clicking `N`.
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As a result, a polygon will be created (read more about the polygons in the [annotation with polygons](/docs/manual/advanced/annotation-with-polygons/)).
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