Brush and Bucket

Overview of the Brush labeling tool in Ango Hub

The brush labeling tool allows you to "paint" on an image or video frame. The Brush tool also includes a bucket to paint areas of similar color.

Adding a Brush tool to your project

From the project’s Settings tab, enter the Category Schema section.

Click on Add Category. From the list that appears, click on Brush.

A new row will appear named Bounding Box. Click on it to expand it.

Give your brush tool a title and description.

Enable the Required toggle if you want to force labelers to create brush traces for each asset. When the toggle is disabled, labelers will be able to save and move to the next asset without creating brush traces using the class you've just created.

If you would like to ask labelers further questions, for example, if you want to show a further radio after drawing brush traces, click on Add Classification and add a further question. More on nested questions here.

Brush and Bucket Options

When you select a Brush tool, a number of options will appear on screen, allowing you to pick a tool between brush and bucket, and more. Here is what will appear once you select a brush:

Region of Interest Tool: Click on the button to activate the Region of Interest tool. More on its own section.

Scissors: When the Brush tool is selected and the scissors are enabled, the brush will act as an eraser and erase existing traces.

Overwrite: Normally, the brush will not paint over existing traces. When this toggle is enabled, it will.

Brush/Bucket: switch between the Brush and Bucket tools.

Size/Threshold Slider: Change the size of the brush tool, or the threshold (e.g. sensitivity, tolerance) of the bucket tool.

When the Bucket tool is selected, the Scissors options is disabled, and a new Contiguous option appears.

Contiguous: When disabled, clicking on a color on the image will select all pixels of the same and similar colors on the image regardless of position. When active, it will limit itself to a contiguous area.

Using the Brush

Select a Brush tool from the Tools section in the left sidebar of the labeling editor. Click and drag on the image where you'd like to draw traces. Use the Scissors as necessary to erase traces.

Deselect the brush tool when you are done.

Using the Bucket

Select a Brush tool from the Tools section, then toggle the Bucket tool.

Choose whether the bucket should behave contiguously or not, then click on a color. The color you're hovering over will be visualized on top of the tolerance slider.

Change the tolerance as necessary. When you are satisfied, click on the below the slider to finalize your bucket annotation..