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163 lines
7.5 KiB
Python
163 lines
7.5 KiB
Python
from os import environ
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from os.path import join
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from pathlib import Path
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from pkg_resources import resource_string
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from json import loads
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from PIL import Image
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import numpy as np
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import cv2
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from click import command
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from ocrd_utils import (
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getLogger,
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assert_file_grp_cardinality,
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make_file_id,
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MIMETYPE_PAGE
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)
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from ocrd import Processor
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from ocrd_modelfactory import page_from_file
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from ocrd_models.ocrd_page import AlternativeImageType, to_xml
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from ocrd.decorators import ocrd_cli_options, ocrd_cli_wrap_processor
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from .sbb_binarize import SbbBinarizer
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OCRD_TOOL = loads(resource_string(__name__, 'ocrd-tool.json').decode('utf8'))
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TOOL = 'ocrd-sbb-binarize'
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def cv2pil(img):
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return Image.fromarray(img.astype('uint8'))
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def pil2cv(img):
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# from ocrd/workspace.py
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if img.mode in ('LA', 'RGBA'):
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newimg = Image.new(img.mode[:-1], img.size, 'white')
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newimg.paste(img, mask=img.getchannel('A'))
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img = newimg
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color_conversion = cv2.COLOR_GRAY2BGR if img.mode in ('1', 'L') else cv2.COLOR_RGB2BGR
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pil_as_np_array = np.array(img).astype('uint8') if img.mode == '1' else np.array(img)
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return cv2.cvtColor(pil_as_np_array, color_conversion)
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class SbbBinarizeProcessor(Processor):
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def __init__(self, *args, **kwargs):
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kwargs['ocrd_tool'] = OCRD_TOOL['tools'][TOOL]
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kwargs['version'] = OCRD_TOOL['version']
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super().__init__(*args, **kwargs)
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if hasattr(self, 'output_file_grp'):
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# processing context
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self.setup()
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def setup(self):
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"""
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Set up the model prior to processing.
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"""
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LOG = getLogger('processor.SbbBinarize.__init__')
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if not 'model' in self.parameter:
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raise ValueError("'model' parameter is required")
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# resolve relative path via environment variable
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model_path = Path(self.parameter['model'])
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if not model_path.is_absolute():
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if 'SBB_BINARIZE_DATA' in environ and environ['SBB_BINARIZE_DATA']:
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LOG.info("Environment variable SBB_BINARIZE_DATA is set to '%s'" \
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" - prepending to model value '%s'. If you don't want this mechanism," \
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" unset the SBB_BINARIZE_DATA environment variable.",
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environ['SBB_BINARIZE_DATA'], model_path)
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model_path = Path(environ['SBB_BINARIZE_DATA']).joinpath(model_path)
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model_path = model_path.resolve()
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if not model_path.is_dir():
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raise FileNotFoundError("Does not exist or is not a directory: %s" % model_path)
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# resolve relative path via OCR-D ResourceManager
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model_path = self.resolve_resource(str(model_path))
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self.binarizer = SbbBinarizer(model_dir=model_path, logger=LOG)
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def process(self):
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"""
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Binarize images with sbb_binarization (based on selectional auto-encoders).
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For each page of the input file group, open and deserialize input PAGE-XML
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and its respective images. Then iterate over the element hierarchy down to
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the requested ``operation_level``.
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For each segment element, retrieve a raw (non-binarized) segment image
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according to the layout annotation (from an existing ``AlternativeImage``,
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or by cropping into the higher-level images, and deskewing when applicable).
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Pass the image to the binarizer (which runs in fixed-size windows/patches
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across the image and stitches the results together).
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Serialize the resulting bilevel image as PNG file and add it to the output
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file group (with file ID suffix ``.IMG-BIN``) along with the output PAGE-XML
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(referencing it as new ``AlternativeImage`` for the segment element).
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Produce a new PAGE output file by serialising the resulting hierarchy.
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"""
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LOG = getLogger('processor.SbbBinarize')
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assert_file_grp_cardinality(self.input_file_grp, 1)
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assert_file_grp_cardinality(self.output_file_grp, 1)
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oplevel = self.parameter['operation_level']
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for n, input_file in enumerate(self.input_files):
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file_id = make_file_id(input_file, self.output_file_grp)
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page_id = input_file.pageId or input_file.ID
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LOG.info("INPUT FILE %i / %s", n, page_id)
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pcgts = page_from_file(self.workspace.download_file(input_file))
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self.add_metadata(pcgts)
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pcgts.set_pcGtsId(file_id)
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page = pcgts.get_Page()
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page_image, page_xywh, _ = self.workspace.image_from_page(page, page_id, feature_filter='binarized')
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if oplevel == 'page':
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LOG.info("Binarizing on 'page' level in page '%s'", page_id)
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bin_image = cv2pil(self.binarizer.run(image=pil2cv(page_image)))
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# update METS (add the image file):
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bin_image_path = self.workspace.save_image_file(bin_image,
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file_id + '.IMG-BIN',
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page_id=input_file.pageId,
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file_grp=self.output_file_grp)
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page.add_AlternativeImage(AlternativeImageType(filename=bin_image_path, comments='%s,binarized' % page_xywh['features']))
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elif oplevel == 'region':
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regions = page.get_AllRegions(['Text', 'Table'], depth=1)
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if not regions:
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LOG.warning("Page '%s' contains no text/table regions", page_id)
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for region in regions:
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region_image, region_xywh = self.workspace.image_from_segment(region, page_image, page_xywh, feature_filter='binarized')
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region_image_bin = cv2pil(self.binarizer.run(image=pil2cv(region_image)))
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region_image_bin_path = self.workspace.save_image_file(
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region_image_bin,
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"%s_%s.IMG-BIN" % (file_id, region.id),
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page_id=input_file.pageId,
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file_grp=self.output_file_grp)
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region.add_AlternativeImage(
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AlternativeImageType(filename=region_image_bin_path, comments='%s,binarized' % region_xywh['features']))
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elif oplevel == 'line':
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region_line_tuples = [(r.id, r.get_TextLine()) for r in page.get_AllRegions(['Text'], depth=0)]
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if not region_line_tuples:
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LOG.warning("Page '%s' contains no text lines", page_id)
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for region_id, line in region_line_tuples:
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line_image, line_xywh = self.workspace.image_from_segment(line, page_image, page_xywh, feature_filter='binarized')
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line_image_bin = cv2pil(self.binarizer.run(image=pil2cv(line_image)))
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line_image_bin_path = self.workspace.save_image_file(
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line_image_bin,
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"%s_%s_%s.IMG-BIN" % (file_id, region_id, line.id),
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page_id=input_file.pageId,
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file_grp=self.output_file_grp)
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line.add_AlternativeImage(
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AlternativeImageType(filename=line_image_bin_path, comments='%s,binarized' % line_xywh['features']))
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self.workspace.add_file(
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ID=file_id,
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file_grp=self.output_file_grp,
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pageId=input_file.pageId,
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mimetype=MIMETYPE_PAGE,
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local_filename=join(self.output_file_grp, file_id + '.xml'),
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content=to_xml(pcgts))
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@command()
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@ocrd_cli_options
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def cli(*args, **kwargs):
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return ocrd_cli_wrap_processor(SbbBinarizeProcessor, *args, **kwargs)
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