Yes, it is possible to use polygon annotations for both object detection and segmentation tasks. In the context of YOLO models, polygon annotations can be used to train different YOLO formats, including YOLOv5 and likely YOLOv8 as well, as mentioned in a forum post by a Roboflow support agent.
When you open an image in the Roboflow Annotate interface, you can create bounding boxes, segmentation masks, classification labels, and polygon annotations, depending on your project type. For an object detection project, you can create either bounding box or polygon annotations. This is applicable for various YOLO models including YOLOv4 PyTorch, YOLOv5, YOLOS, and YOLO-NAS.
Therefore, it is not necessary to re-label all images with bounding boxes for object detection if you have already labeled them with polygons. You can use the same polygon-labeled images for both object detection and segmentation tasks.
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