Add the basic project layout and minimal functionality

LICENSE

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+Copyright © 2019 Kay-Michael Würzner
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
+OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+

ocrd-tool.json

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+ocrd_evaluate_segmentation/ocrd-tool.json

ocrd_evaluate_segmentation/__init__.py

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+from .evaluate import EvaluateSegmentation

ocrd_evaluate_segmentation/cli.py

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+import click
+
+from ocrd.decorators import ocrd_cli_options, ocrd_cli_wrap_processor
+from ocrd_evaluate_segmentation.evaluate import EvaluateSegmentation
+
+@click.command()
+@ocrd_cli_options
+def ocrd_evaluate_segmentation(*args, **kwargs):
+    return ocrd_cli_wrap_processor(EvaluateSegmentation, *args, **kwargs)

ocrd_evaluate_segmentation/config.py

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+import os
+import json
+from pkg_resources import resource_string
+
+OCRD_TOOL = json.loads(resource_string(__name__, 'ocrd-tool.json').decode('utf8'))

ocrd_evaluate_segmentation/evaluate.py

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+from __future__ import absolute_import
+
+import os.path
+
+from ocrd import Processor
+from ocrd_utils import (
+    getLogger, concat_padded,
+    polygon_from_points,
+    MIMETYPE_PAGE
+)
+from ocrd_modelfactory import page_from_file
+from ocrd_models.ocrd_page import (
+    CoordsType,
+    LabelType, LabelsType,
+    MetadataItemType,
+    TextLineType,
+    to_xml
+)
+
+from .config import OCRD_TOOL
+
+from shapely.geometry import Polygon
+
+TOOL = 'ocrd-evaluate-segmentation'
+LOG = getLogger('processor.EvaluateSegmentation')
+
+class EvaluateSegmentation(Processor):
+
+    def __init__(self, *args, **kwargs):
+        kwargs['ocrd_tool'] = OCRD_TOOL['tools'][TOOL]
+        kwargs['version'] = OCRD_TOOL['version']
+        super(EvaluateSegmentation, self).__init__(*args, **kwargs)
+
+
+    def process(self):
+        """Performs segmentation evaluation with Shapely on the workspace.
+        
+        Open and deserialize PAGE input files and their respective images,
+        then iterate over the element hierarchy down to the region level.
+        
+        Return information on the plausibility of the segmentation into
+        regions on the logging level.
+        """
+
+        for (n, input_file) in enumerate(self.input_files):
+            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))
+            metadata = pcgts.get_Metadata() # ensured by from_file()
+            metadata.add_MetadataItem(
+                MetadataItemType(type_="processingStep",
+                                 name=self.ocrd_tool['steps'][0],
+                                 value=TOOL,
+                                 # FIXME: externalRef is invalid by pagecontent.xsd, but ocrd does not reflect this
+                                 # what we want here is `externalModel="ocrd-tool" externalId="parameters"`
+                                 Labels=[LabelsType(#externalRef="parameters",
+                                                    Label=[LabelType(type_=name,
+                                                                     value=self.parameter[name])
+                                                           for name in self.parameter.keys()])]))
+            page = pcgts.get_Page()
+
+            for region1 in page.get_TextRegion():
+                for region2 in page.get_TextRegion():
+                    if region1.id == region2.id:
+                        continue
+                    LOG.info('Comparing regions "%s" and "%s"', region1.id, region2.id)
+                    region_poly1 = Polygon(polygon_from_points(region1.get_Coords().points))
+                    region_poly2 = Polygon(polygon_from_points(region2.get_Coords().points))
+                    LOG.info('Intersection %i', region_poly1.intersects(region_poly2))
+                    LOG.info('Containment %i', region_poly1.contains(region_poly2))
+                    if region_poly1.intersects(region_poly2):
+                        LOG.info('Area 1 %d', region_poly1.area)
+                        LOG.info('Area 2 %d', region_poly2.area)
+                        LOG.info('Area intersect %d', region_poly1.intersection(region_poly2).area)
+
+
+            # Use input_file's basename for the new file -
+            # this way the files retain the same basenames:
+            file_id = input_file.ID.replace(self.input_file_grp, self.output_file_grp)
+            if file_id == input_file.ID:
+                file_id = concat_padded(self.output_file_grp, n)
+            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))

ocrd_evaluate_segmentation/ocrd-tool.json

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+{
+  "version": "0.0.1",
+  "git_url": "https://github.com/OCR-D/ocrd_evaluate_segmentation",
+  "tools": {
+    "ocrd-evaluate-segmentation": {
+      "executable": "ocrd-evaluate-segmentation",
+      "categories": ["Image preprocessing"],
+      "description": "Evaluate regions",
+      "input_file_grp": [
+        "OCR-D-IMG",
+        "OCR-D-SEG-BLOCK"
+      ],
+      "output_file_grp": [
+        "OCR-D-EVAL-BLOCK"
+      ],
+      "steps": ["preprocessing/optimization/deskewing"]
+    }
+  }
+}

requirements.txt

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+ocrd >= 1.0.0b11
+click
+shapely

setup.py

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+# -*- coding: utf-8 -*-
+"""
+Installs:
+
+    - ocrd-evaluate-segmentation
+"""
+import codecs
+
+from setuptools import setup, find_packages
+
+setup(
+    name='ocrd_evaluate_segmentation',
+    version='0.0.1',
+    description='Segmentation evaluation',
+    long_description=codecs.open('README.md', encoding='utf-8').read(),
+    author='Konstantin Baierer, Kay-Michael Würzner, Robert Sachunsky',
+    author_email='[email protected], [email protected], [email protected]',
+    url='https://github.com/OCR-D/ocrd_evaluate_segmentation',
+    license='Apache License 2.0',
+    packages=find_packages(exclude=('tests', 'docs')),
+    install_requires=open('requirements.txt').read().split('\n'),
+    package_data={
+        '': ['*.json', '*.yml', '*.yaml'],
+    },
+    entry_points={
+        'console_scripts': [
+            'ocrd-evaluate-segmentation=ocrd_evaluate_segmentation.cli:ocrd_evaluate_segmentation',
+        ]
+    },
+)