Omkar2118/datasets huggingface dataset:
UltraDensePose
Full name: UltraDensePose

a character sheet dataset containing over 700,000 hand-drawn and synthesized images of diverse poses

Introducing paper: Collaborative Neural Rendering using Anime Character Sheets
COCO-OOD

COCO-OOD dataset contains only unknown categories, consisting of 504 images with ﬁne-grained annotations of 1655 unknown objects. All annotations consist of original annotations in COCO and the augmented annotations on the basis of the COCO definition.

Introducing paper: Unknown Sniffer for Object Detection: Don't Turn a Blind Eye to Unknown Objects
COCO-Mix

COCO-Mixed dataset includes 897 images with annotations of both known and unknown categories. It contains 2533 unknown objects and 2658 known objects, with original COCO annotations used as labels for known objects. Unambiguous unlabeled objects are also annotated. The dataset is more challenging to evaluate due to the images containing more object instances with complex categories and concentrated locations.

Introducing paper: Unknown Sniffer for Object Detection: Don't Turn a Blind Eye to Unknown Objects