Display / edit of GT labelling metadata
Opened this issue · 1 comments
It would be convenient if browse-ocrd was capable to display and edit GT labelling metadata.
(we're discussing the OCR-D GT call, so I wanted to note it down lest we forget)
Note: In METS, the labels are a flat sequence of gt:state
elements with @prop
from the above mentioned schema file, one per page.
<mets:dmdSec ID="DMDGT_0001">
<mets:mdWrap MDTYPE="OTHER" OTHERMDTYPE="GT">
<mets:xmlData>
<gt:gt>
<gt:state prop="granularity/physical/document-related/word"/>
<gt:state prop="granularity/physical/document-related/text-line"/>
<gt:state prop="granularity/physical/document-related/region"/>
<gt:state prop="data-attributes/document-related/visual/text/font/multi-font/typefaces"/>
<gt:state prop="data-attributes/document-related/visual/text/font/multi-font/font-sizes"/>
<gt:state prop="data-attributes/language/mixed"/>
<gt:state prop="condition/production-related/document-faults/ink-from-facing"/>
<gt:state prop="condition/wear/additions/informative/annotations"/>
<gt:state prop="condition/production-related/document-characteristics/low-contrast"/>
<gt:state prop="condition/acquisition/method-flaws/imaging/uneven-illumination"/>
</gt:gt>
</mets:xmlData>
</mets:mdWrap>
</mets:dmdSec>
These are then referenced under each physical structMap's page via @DMDID
.
IMO in core we first need some additional API to support that. Like (in analogy to pageId):
OcrdMets.get_gt_labelling(self, for_fileIds=None) # returns dict of file ID to label list
OcrdMets.get_gt_labelling_for_file(self, ocrd_file) # returns label list
OcrdMets.set_gt_labelling_for_file(self, labels, ocrd_file) # takes label list
# but also:
OcrdMets.add_file(self, ... labels=None, ...) # add full label list
OcrdMets.find_files(self, ... labels=None, ...) # filter by label list (match any)
What's your opinion, @kba?
Perhaps – instead of parsing this from the METS, we could also see to it that OCR-D mirrors them in the parsed PAGE-XML, i.e. OcrdPage
.
For example as:
<MetadataItem type="imageProperties" name="gt-labelling">
<Labels externalModel="https://github.com/OCR-D/gt-labelling/blob/master/xsd_schema/OCR-D_GT_schema.xsd" externalId="http://www.ocr-d.de/GT/">
<Label value="granularity/physical/document-related/word"/>
<Label value="granularity/physical/document-related/text-line"/>
<Label value="granularity/physical/document-related/region"/>
<Label value="data-attributes/document-related/visual/text/font/multi-font/typefaces"/>
<Label value="data-attributes/document-related/visual/text/font/multi-font/font-sizes"/>
<Label value="data-attributes/language/mixed"/>
<Label value="condition/production-related/document-faults/ink-from-facing"/>
<Label value="condition/wear/additions/informative/annotations"/>
<Label value="condition/production-related/document-characteristics/low-contrast"/>
<Label value="condition/acquisition/method-flaws/imaging/uneven-illumination"/>
</Labels>
</MetadataItem>
This would make it easier to access the labels from a processor or PAGE viewer.