Label Images and Video

Label images and video using Image Labeler and Video Labeler apps

Use the Image Labeler and Video Labeler apps to interactively annotate images and video sequences for computer vision tasks such as object detection, semantic segmentation, instance segmentation, text detection, and image or video classification. You can define label types and apply annotations for rectangles, polygons, polylines, scene labels, and pixel-level labels. For more information, see Get Started with the Image Labeler and Get Started with the Video Labeler.

You can also import ground truth from external formats like COCO and ASAM OpenLABEL®.

Apps

Image Labeler	Label images for computer vision applications
Video Labeler	Label video for computer vision applications

Functions

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Manage Labeled Ground Truth Data

`groundTruth`	Ground truth label data
`pixelLabelDatastore`	Datastore for pixel label data
`boxLabelDatastore`	Datastore for bounding box label data
`cuboid2img`	Project cuboids from 3-D world coordinates to 2-D image coordinates (Since R2022b)

Import Ground Truth from External Ground Truth Formats

`groundTruthDataSource`	Object for storing ground truth data sources
`groundTruthFromCOCO`	Convert COCO JSON file into ground truth object (Since R2025a)
`groundTruthFromOpenLabel`	Convert OpenLabel JSON file to ground truth object (Since R2024b)
`groundTruthToOpenLabel`	Convert ground truth object to OpenLabel JSON file (Since R2024a)

Create and Manage Label Definitions

Create Label Definitions

`labelDefinitionCreator`	Object for storing, modifying and creating label definitions table
`create`	Create label definitions table from the label definition creator object
`info`	Display information about a label, sublabel, or attribute stored in label definition creator object

Add Label, Sublabel, and Attribute

`addLabel`	Add label to label definition creator object
`addSublabel`	Add sublabel to label in label definition creator object
`addAttribute`	Add attributes to label or sublabel in label definition creator object

Edit Label, Name, and Description

`editLabelGroup`	Modify a label group name
`editGroupName`	Change group name
`editLabelDescription`	Modify description of label or sublabel in label definition creator object
`editAttributeDescription`	Modify description of attribute in label definition creator object

Remove Label, Sublabel, and Attribute

`removeLabel`	Remove label from label definition creator object
`removeSublabel`	Remove sublabel from label in label definition creator object
`removeAttribute`	Remove attribute from label or sublabel in label definition creator object

Topics

Choose an App to Label Ground Truth Data
Decide which app to use to label ground truth data: Image Labeler, Video Labeler, Ground Truth Labeler, Lidar Labeler, Signal Labeler, or Medical Image Labeler.
Get Started with the Image Labeler
Interactively label rectangular ROIs for object detection, pixels for semantic segmentation, polygons for instance segmentation, and scenes for image classification.
Get Started with the Video Labeler
Interactively label rectangular ROIs for object detection, pixels for semantic segmentation, polygons for instance segmentation, and scenes for image classification in a video or image sequence.
Label Pixels for Semantic Segmentation
Label pixels for training a semantic segmentation network by using a labeling app.
Label Objects Using Polygons for Instance Segmentation
Label ground truth objects using polygons for instance segmentation.
Get Started with Team-Based Labeling
Use the Labeler app to create a labeling project to create labels, distribute label tasks, review tasks, and provide feedback.
Label Very Large High-Resolution Images Using Image Labeler
This topic explains how to efficiently label high-resolution and large-scale images using the Image Labeler app, especially when working with images too large to fit into memory.
Keyboard Shortcuts and Mouse Actions for Video Labeler
Use keyboard shortcuts and mouse actions to increase productivity while using the Video Labeler app.