From 5909f94fab77c9c80ba19b25478d8d42a3ec26f4 Mon Sep 17 00:00:00 2001
From: Konstantin Baierer <unixprog@gmail.com>
Date: Thu, 15 Oct 2020 16:39:38 +0200
Subject: [PATCH] initial OCR-D interface

---
 sbb_binarize/ocrd-tool.json |  8 +++-
 sbb_binarize/ocrd_cli.py    | 75 +++++++++++++++++++++++++++++++++++++
 2 files changed, 82 insertions(+), 1 deletion(-)
 create mode 100644 sbb_binarize/ocrd_cli.py

diff --git a/sbb_binarize/ocrd-tool.json b/sbb_binarize/ocrd-tool.json
index 70eab2a..dafc09a 100644
--- a/sbb_binarize/ocrd-tool.json
+++ b/sbb_binarize/ocrd-tool.json
@@ -10,6 +10,12 @@
       "input_file_grp": [],
       "output_file_grp": [],
       "parameters": {
+        "operation_level": {
+          "type": "string",
+          "enum": ["page", "region", "line"],
+          "default": "page",
+          "description": "PAGE XML hierarchy level to operate on (currently only page supported"
+        },
         "patches": {
           "description": "by setting this parameter to true you let the model to see the image in patches.",
           "type": "boolean",
@@ -17,7 +23,7 @@
         },
         "model": {
           "description": "models directory.",
-          "format": "string",
+          "type": "string",
           "required": true
         }
       }
diff --git a/sbb_binarize/ocrd_cli.py b/sbb_binarize/ocrd_cli.py
new file mode 100644
index 0000000..7cb8022
--- /dev/null
+++ b/sbb_binarize/ocrd_cli.py
@@ -0,0 +1,75 @@
+import os.path
+from pkg_resources import resource_string
+from json import loads
+
+from ocrd_utils import (
+    getLogger,
+    assert_file_grp_cardinality,
+    make_file_id,
+    MIMETYPE_PAGE
+)
+from ocrd_modelfactory import page_from_file
+from ocrd_models.ocrd_page import (
+    MetadataItemType,
+    LabelsType, LabelType,
+    AlternativeImageType,
+    TextRegionType,
+    to_xml
+)
+from ocrd import Processor
+
+from .sbb_binarize import SbbBinarizer
+
+OCRD_TOOL = loads(resource_string(__name__, 'ocrd-tool.json').decode('utf8'))
+TOOL = 'ocrd-sbb-binarize'
+
+class SbbBinarizeProcessor(Processor):
+
+    def __init__(self, *args, **kwargs):
+        kwargs['ocrd_tool'] = OCRD_TOOL['tools'][TOOL]
+        kwargs['version'] = OCRD_TOOL['version']
+        super().__init__(*args, **kwargs)
+
+    def process(self):
+        """
+        Binarize with sbb_binarization
+        """
+        LOG = getLogger('processor.SbbBinarize')
+        assert_file_grp_cardinality(self.input_file_grp, 1)
+        assert_file_grp_cardinality(self.output_file_grp, 1)
+
+        oplevel = self.parameter['operation_level']
+        use_patches = self.parameter['patches']
+        model_path = self.parameter['model']
+
+        for n, input_file in enumerate(self.input_files):
+            file_id = make_file_id(input_file, self.output_file_grp)
+            page_id = input_file.pageId or input_file.ID
+            LOG.info("INPUT FILE %i / %s", n, page_id)
+            pcgts = page_from_file(self.workspace.download_file(input_file))
+            self.add_metadata(pcgts)
+            page = pcgts.get_Page()
+
+            if oplevel == 'page':
+                LOG.info("Binarizing on 'page' level in page '%s'", page_id)
+                page_image, page_xywh, _ = self.workspace.image_from_page(page, page_id)
+                binarizer = SbbBinarizer(image=page_image, model=model_path, patches=use_patches, save=None)
+                bin_image = binarizer.run()
+                # update METS (add the image file):
+                bin_image_path = self.workspace.save_image_file(bin_image,
+                        file_id + '.IMG-BIN',
+                        page_id=page_id,
+                        file_grp=self.output_file_grp)
+                page.add_AlternativeImage(filename=bin_image_path, comment="binarized")
+            else:
+                raise NotImplementedError("Binarization below page level not implemented yet")
+
+            file_id = make_file_id(input_file, self.output_file_grp)
+            pcgts.set_pcGtsId(file_id)
+            self.workspace.add_file(
+                ID=file_id,
+                file_grp=self.output_file_grp,
+                pageId=input_file.pageId,
+                mimetype=MIMETYPE_PAGE,
+                local_filename=os.path.join(self.output_file_grp, file_id + '.xml'),
+                content=to_xml(pcgts))