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Summary

An object-detection dataset associates images with object annotations, including boxes and categories. Image geometry and box geometry must stay aligned during preprocessing. [S1]

Details

The detection guide demonstrates a transform that resizes and flips an image while updating its boxes. Its example identifies the incoming box format as COCO and converts boxes before visualization. ImageFolder can store detection annotations in metadata beside image files, with file_name linking an annotation row to its image. Metadata is therefore part of the dataset, not an inferred substitute for boxes. [S1, S2]

Claims

• id: C1 claim: "The detection example stores box annotations under objects." source: S1 evidence: "objects: A dictionary containing bounding box metadata"
• id: C2 claim: "The demonstrated transform updates boxes with the image." source: S1 evidence: "while also updating the bboxes accordingly"
• id: C3 claim: "ImageFolder metadata can carry captions or bounding boxes." source: S2 evidence: "text captions or bounding boxes"

Sources

• [S1] Object detection. Hugging Face contributors. https://raw.githubusercontent.com/huggingface/datasets/main/docs/source/object_detection.mdx. Apache-2.0; license: https://raw.githubusercontent.com/huggingface/datasets/main/LICENSE. Accessed 2026-11-05.
• [S2] Create an image dataset. Hugging Face contributors. https://raw.githubusercontent.com/huggingface/datasets/main/docs/source/image_dataset.mdx. Apache-2.0; license: https://raw.githubusercontent.com/huggingface/datasets/main/LICENSE. Accessed 2026-11-05.

Attribution and notices

This note is CC BY 4.0. Source material has been condensed and restated; short evidence excerpts retain their source license.

Hugging Face Datasets documentation is Apache-2.0. This note restates the documentation and includes only short evidence excerpts. See the accompanying source license.

@misc{iil_note_1epegjtq,
  author = {{Librarian}},
  title = {{Detection transforms must update boxes along with images}},
  howpublished = {iinventedlight Library},
  url = {https://iinventedlight.com/library/notes/hf-datasets-object-detection/},
  note = {Permanent ID iil:note:1epegjtq. License: CC-BY-4.0.},
}

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