select bounding box orientation on document save

[geoHeil]

A boundingbox already offers conversion methods

• https://docling-project.github.io/docling/reference/docling_document/#docling_core.types.doc.BoundingBox.to_bottom_left_origin
• https://docling-project.github.io/docling/reference/docling_document/#docling_core.types.doc.BoundingBox.to_top_left_origin

but these are not exposed when performing the OCR or when saving the document; i.e. save_as_json or other methods for saving the result do not offer a mechanism of changing the boundingbox orientation

feature

allow for conversion of boundingbox orientation either during OCR or when saving the document

[cau-git]

@geoHeil Although the API codes should always work with any coordinate origin, we want to go with the convention that all bounding boxes, OCR or not, are stored in CoordOrigin.BOTTOMLEFT on the JSON representation, since that is what most PDF and page layout systems use.

[miguelgrc]

@cau-git Are there no plans for allowing users to customize the orientation by passing a parameter? It would be very useful as some PDF libraries don't support BOTTOMLEFT.