74 lines
2.8 KiB
Markdown
74 lines
2.8 KiB
Markdown
---
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title: 'Join and slice tools'
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linkTitle: 'Join and slice tools'
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weight: 18
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description: 'This section explains how to slice or join several labels'
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---
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In CVAT you can modify shapes by either joining multiple shapes into
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a single label or slicing a single label into several shapes.
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This document provides guidance on how to perform these operations effectively.
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See:
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- [Joining masks](#joining-masks)
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- [Slicing polygons and masks](#slicing-polygons-and-masks)
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## Joining masks
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The **Join masks** tool (),
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is specifically designed to work with mask annotations.
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This tool is useful in scenarios where a single object
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in an image is annotated with multiple shapes,
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and there is a need to merge these shapes into a single one.
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To join masks, do the following:
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1. From the {{< ilink "/docs/manual/basics/CVAT-annotation-Interface/controls-sidebar#edit" "**Edit**" >}} block,
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select **Join masks** .
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2. Click on the canvas area, to select masks that you want to join.
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3. (Optional) To remove the selection click the mask one more time.
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4. Click again on **Join masks**
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(**J**) to execute the join operation.
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Upon completion, the selected masks will be joined into a single mask.
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## Slicing polygons and masks
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The **Slice mask/polygon** ()
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is compatible with both mask and polygon annotations.
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This tool is useful in scenarios where multiple objects in an image
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are annotated with one shape,
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and there is a need to slice this shape into multiple parts.
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{{% alert title="Note" color="primary" %}}
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The shape can be sliced only in two parts
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at a time. Use the slice tool several times
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to split a shape to as many parts as you need.
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{{% /alert %}}
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To slice mask or polygon, do the following:
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1. From the {{< ilink "/docs/manual/basics/CVAT-annotation-Interface/controls-sidebar#edit" "**Edit**" >}} block,
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select **Slice mask/polygon** .
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2. Click on the shape you intend to slice.
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A black contour will appear around the selected shape.
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3. Set an initial point for slicing by clicking on the contour.
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4. Draw a line across the shape to define the slicing path.
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<br>Hold Shift to add points automatically on cursor movement.
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<br> **Note**: The line cannot cross itself.
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<br> **Note**: The line cannot cross the contour more than twice.
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5. (Optional)> Right-click to cancel the latest point.
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6. Click on the contour (**Alt**+**J**) (outside the contour) to finalize the slicing.
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