[LabelAnnotator, RichLabelAnnotator, VertexLabelAnnotator] - add smart label positioning

[SkalskiP]

Description

Overlapping labels are a common issue, especially in crowded scenes. Let's add an optional smart label positioning feature to the LabelAnnotator, RichLabelAnnotator, and VertexLabelAnnotator that:

• Ensures that the label box does not extend beyond the image.
• Automatically adjust the position of overlapping labels to prevent them from overlapping.

The algorithm boils down to locating overlapping label boxes and then calculating the direction of vectors to push the labels apart. This process may require an iterative approach, as moving label boxes can lead to new overlaps with other label boxes.

Importantly, the bounding box remains in the same place, only the label boxes are moved. It would be great if, after the shift, the label and its original position were connected by a line.

Examples of incorrect behavior

Examples of expected behavior

vertex-label-annotator-v1-optimized.mp4

Here's the Google Colab I used to experiment with this feature.

Additional

• Note: Please share a Google Colab with minimal code to test the new feature. We know it's additional work, but it will speed up the review process. The reviewer must test each change. Setting up a local environment to do this is time-consuming. Please ensure that Google Colab can be accessed without any issues (make it public). Thank you! 🙏🏻

[Bhavay-2001]

Hi @SkalskiP, could you pls describe the issue a little more and also can i take this issue?

[SkalskiP]

Hi @Bhavay-2001 👋🏻 I recommend doing this first: #1384

[jeslinpjames]

Hey, @SkalskiP

I'd like to try working on this. Could you provide any specific guidelines or tips for implementing this feature?