V4ldeLund/kbl-open-images

Royal Danish Library Open COP Images

This dataset is an independently harvested research dataset from the Royal Danish Library (Det Kgl. Bibliotek) COP/Digital Collections API.

The export intentionally excludes:

• aerial photographs / Danmark set fra luften
• newspapers, including Danske aviser 1666-1883
• text-heavy COP editions such as books, letters, manuscripts, pamphlets, catalogues and printed matter

Included COP editions:

• Billeder
• Kort og Atlas as a separate source_subset=maps subset, so it can be filtered out if only photographic/drawing material is wanted.
• Flora Danica subject collection as source_subset=flora_danica.
• Portraetsamlingen subject collection as source_subset=portraetsamlingen.

Records were discovered using broad license-keyword searches and then filtered by the actual MODS rights/accessCondition metadata. The accepted rights buckets are:

• Public Domain
• No known rights
• CC BY
• CC BY-SA

In the current COP MODS records, KBL commonly expresses public-domain/no-known-rights material as Materialet er fri af ophavsret.

Counts

• Total image samples across configs: 67,166
• Total accepted source records across configs: 52,189
• images image samples: 19,600
• images source records: 16,011
• images licenses: Public Domain 19,565, CC BY 35
• images source_subsets: billeder 13,792, maps 5,808
• images dropped_ambiguous_rights_rows: 2
• flora_danica image samples: 3,237
• flora_danica source records: 3,237
• flora_danica licenses: Public Domain 3,237
• flora_danica source_subsets: flora_danica 3,237
• flora_danica duplicate_rows_skipped: 3
• portraetsamlingen image samples: 44,329
• portraetsamlingen source records: 32,941
• portraetsamlingen licenses: Public Domain 43,806, CC BY 523
• portraetsamlingen source_subsets: portraetsamlingen 44,329
• portraetsamlingen duplicate_rows_skipped: 13,653
• portraetsamlingen rejected_records: 32,365

Files

• metadata/*.parquet: normalized metadata-only table, including the raw MODS XML.
• metadata_flora_danica/*.parquet: Flora Danica metadata-only table.
• metadata_portraetsamlingen/*.parquet: Portraetsamlingen metadata-only table.
• metadata/*.json: selected/excluded source definitions, license-query list and summary.
• viewer_embedded/*.parquet: Hugging Face viewer-compatible table with embedded JPEG bytes and normalized metadata.
• viewer_embedded_flora_danica/*.parquet: Flora Danica viewer-compatible table with embedded JPEG bytes.
• viewer_embedded_portraetsamlingen/*.parquet: Portraetsamlingen viewer-compatible table with embedded JPEG bytes.
• webdataset-jpg1600-open/*.tar: training shards with <sample_id>.jpg and <sample_id>.json.
• webdataset-jpg1600-flora_danica/*.tar: Flora Danica training shards.
• webdataset-jpg1600-portraetsamlingen/*.tar: Portraetsamlingen training shards.
• manifests/*.json: per-shard image download manifests.
• scripts/*.py: scraper/uploader scripts used for this export.

Source Notes

KBL's public API page says the API provides machine access to datasets containing aerial photos, images and literary texts. KBL's API documentation states that API metadata is CC0, while content has varying licenses. This dataset therefore treats every image record according to its own MODS rights/accessCondition metadata.

Source/API references:

• KBL COP API page: https://api.kb.dk/data/cop
• KBL digital-object API documentation: https://github.com/kb-dk/access-digital-objects
• COP backend/search docs: https://github.com/kb-dk/access-digital-objects/blob/master/cop-backend.md
• IIIF image delivery docs: https://github.com/kb-dk/access-digital-objects/blob/master/image-delivery.md

For Danish CLIP training, preferred_title, preferred_description, and preferred_text are Danish-first fields: Danish metadata is used whenever present, with English as fallback.