> For the complete documentation index, see [llms.txt](https://docs.imerit.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.imerit.net/3d-multi-sensor-fusion/labeling/3d-multi-sensor-fusion-labeling-editor/key-features/regions-of-interest.md).

# Regions Of Interest

The tool supports various shapes for Regions of Interest (ROI) tools to help focus annotation efforts on the most relevant parts of the scene.

{% hint style="success" %} <img src="/files/mXHEiGg35kYjwl0I4r5p" alt="" data-size="line"> These ROI tools help streamline the annotation process, reduce visual clutter, and enhance productivity by focusing only where it matters.
{% endhint %}

![](/files/048b5f59faaa169756b3cfddeff104903454f28e)

The ROI feature supports:

* Rectangular ROI: Draw rectangular-shaped ROIs by defining the desired dimension.
* Cylinder ROI: Circular ROIs can also be created.
* Multiple ROIs: Create and manage multiple ROI shapes within a single frame.
* Visual Cue: Points inside the defined ROI appear brighter to improve visibility and focus.

***

## Use cases

Customers often require annotations in specific areas, such as:

* The lane directly ahead of the ego vehicle – critical for path planning and obstacle detection.
* A designated area on the opposite side of the road – useful for monitoring incoming traffic or specific scenarios.
* A zone equidistant from the ego vehicle across all sides – helpful for uniform object detection analysis.
* Blind spots caused by the ego vehicle’s size or structure – important for safety-critical annotation tasks.

***

## Steps to use Regions of Interest

### Cylinder

{% stepper %}
{% step %}

#### Enable Regions of Interest

* Navigate to Tool Settings.
* Scroll to the bottom and toggle Regions of Interest to ON.
  {% endstep %}

{% step %}

#### Add a cylinder

* Click the ‘+’ button next to Add Cylinder.
* A default 10-meter radius cylinder will be added.
* Adjust the radius as needed to suit your use case.
  {% endstep %}
  {% endstepper %}

{% hint style="info" %}
Tip: Use the ‘+’ icon to add more cylinders/boxes if multiple regions are required.
{% endhint %}

### Box

{% stepper %}
{% step %}

#### Enable Regions of Interest

* Navigate to Tool Settings.
* Scroll to the bottom and toggle Regions of Interest to ON.
  {% endstep %}

{% step %}

#### Add a box

* Click the ‘+’ button next to Add Box.
* A default 10-meter radius box will be added.
* Adjust the box dimensions as needed to suit your use case.
  {% endstep %}
  {% endstepper %}

{% hint style="success" %} <img src="/files/mXHEiGg35kYjwl0I4r5p" alt="" data-size="line"> Users can create Regions of Interest using both cylinder and cuboid shapes, depending on the area and context of annotation.
{% endhint %}