Image Labeling Editor

Overview of the Image Labeling Editor in Ango Hub

Ango Hub provides a labeling editor with which image files can be annotated.

This article will exclusively go over Ango Hub’s image labeling interface. Features common to all labeling editors (audio, image, PDF, and text) are instead explained here.

Overview of the Image Labeling Editor in Ango Hub

Zoom buttons

The three buttons allow you to zoom in, zoom out, and fit the asset to screen, respectively.

Scrolling with the mouse wheel will zoom in and out of the asset. Double-clicking will zoom in on the zone that’s been double-clicked.

How to Annotate Images

The following are the labeling tools supported on images:

From the Tools panel on the left sidebar, select a supported labeling tool. Then, follow the instructions found on each tool's docs page, linked to above.

If no tools are present in the project, only answer the questions in the Classifications panel.

Nested Questions and Classifications

If the labels have nested questions, click on a label to select it, then right-click on it and open the the menu item that appears to see and answer the nested questions.

If classification questions are present, you may answer them from the Classifications panel on the left sidebar.

Quick Settings Menu

The following is a list of quick settings unique to Ango Hub's image labeling editor. For an explanation of the settings common to all data types, visit the Labeling Editor Interface docs page.

Hide Segmentation Points: when enabled, segmentation points are disabled, improving performance.

Hide Unknown Objects: when enabled, unknown objects (annotations without categorization, for example, annotations created with OCR or Lung Detector) are not shown. They will still appear in the export.

Image Smoothing Enabled: when enabled, images will be smoothed out so that individual pixels are not discernible.

Opacity: sets the opacity of the annotations.

Point Radius: sets the radius of point annotations.

Border Thickness: sets the thickness of the borders of bounding boxes.

Invert: inverts the colors of the image.

Brightness: sets the image's brightness.

Contrast: sets the image's contrast.

Cloning Annotations

In multi-image assets, you can quickly clone the annotations present in one page to other pages.

To do so, navigate to the page containing the annotations you wish to clone. Then, click on the three dots at the top-right of the screen, and click on "Clone":

The 'Clone' dialog will appear:

From here, you may choose whether to clone all of the annotations in the current frame or only the annotations being selected.

If you pick Clone All, you will see the following checkboxes:

Select the type of annotations that you wish to clone among tools, classifications, and relations. Then, select the frames to which you wish to clone the annotations. In the example above, the objects and relations in the frame 1 will be copied to frames 2-10 included.

Existing annotations in frames 2-10 will not be deleted or overwritten.

Click on 'Clone' to clone the annotations.

Keyboard Shortcuts

A full list of keyboard shortcuts is available by clicking on the Keyboard button on the right side of the top bar:

Further reading

pageAudio Labeling EditorpageLabeling Editor Interface

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