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PEP8
This commit is contained in:
Jim Barlow
parent
db311fb6a2
commit
4a9337f757
@ -11,279 +11,296 @@ from reportlab.pdfgen.pdfimages import PDFImage
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from reportlab.lib.units import inch
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from lxml import etree as ElementTree
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from PIL import Image
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import re, sys
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import re
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import sys
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import argparse
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def monkeypatch_method(cls):
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'''
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Override a class method at runtime.
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Rationale:
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https://mail.python.org/pipermail/python-dev/2008-January/076194.html
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'''
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def decorator(func):
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setattr(cls, func.__name__, func)
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return func
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return decorator
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def monkeypatch_method(cls):
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'''
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Override a class method at runtime.
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Rationale:
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https://mail.python.org/pipermail/python-dev/2008-January/076194.html
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'''
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def decorator(func):
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setattr(cls, func.__name__, func)
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return func
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return decorator
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@monkeypatch_method(PDFImage)
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def PIL_imagedata(self):
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'''
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Add ability to output greyscale and 1-bit PIL images without conversion to RGB.
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'''
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Add ability to output greyscale and 1-bit PIL images without conversion to RGB.
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The upstream Python 2.7 version of reportlab converts 1-bit PIL images to RGB
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instead of saving them in a lower BPP format. They have since added the following
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fix to their Python 3.3 branch, but it has not been back-ported.
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The upstream Python 2.7 version of reportlab converts 1-bit PIL images to RGB
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instead of saving them in a lower BPP format. They have since added the following
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fix to their Python 3.3 branch, but it has not been back-ported.
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https://bitbucket.org/rptlab/reportlab/commits/177ddcbe4df6f9b461dac62612df9b8da3966a5d
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'''
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image = self.image
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if image.format == 'JPEG':
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fp = image.fp
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fp.seek(0)
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return self._jpg_imagedata(fp)
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https://bitbucket.org/rptlab/reportlab/commits/177ddcbe4df6f9b461dac62612df9b8da3966a5d
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'''
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image = self.image
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if image.format == 'JPEG':
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fp = image.fp
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fp.seek(0)
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return self._jpg_imagedata(fp)
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from reportlab.lib.utils import import_zlib
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from reportlab import rl_config
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from reportlab.pdfbase.pdfutils import _chunker
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# in order to support both newer and older versions of reportlab
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try:
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from reportlab.pdfbase.pdfutils import _AsciiBase85Encode
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except ImportError:
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from reportlab.pdfbase.pdfutils import asciiBase85Encode as _AsciiBase85Encode
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self.source = 'PIL'
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zlib = import_zlib()
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if not zlib:
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return
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from reportlab.lib.utils import import_zlib
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from reportlab import rl_config
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from reportlab.pdfbase.pdfutils import _chunker
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# in order to support both newer and older versions of reportlab
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try:
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from reportlab.pdfbase.pdfutils import _AsciiBase85Encode
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except ImportError:
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from reportlab.pdfbase.pdfutils import asciiBase85Encode as _AsciiBase85Encode
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bpc = 8
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# Use the colorSpace in the image
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if image.mode == 'CMYK':
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myimage = image
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colorSpace = 'DeviceCMYK'
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bpp = 4
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elif image.mode == '1':
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myimage = image
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colorSpace = 'DeviceGray'
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bpp = 1
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bpc = 1
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elif image.mode == 'L':
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myimage = image
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colorSpace = 'DeviceGray'
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bpp = 1
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else:
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myimage = image.convert('RGB')
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colorSpace = 'RGB'
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bpp = 3
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imgwidth, imgheight = myimage.size
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self.source = 'PIL'
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zlib = import_zlib()
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if not zlib:
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return
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# this describes what is in the image itself
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# *NB* according to the spec you can only use the short form in inline images
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bpc = 8
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# Use the colorSpace in the image
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if image.mode == 'CMYK':
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myimage = image
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colorSpace = 'DeviceCMYK'
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bpp = 4
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elif image.mode == '1':
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myimage = image
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colorSpace = 'DeviceGray'
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bpp = 1
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bpc = 1
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elif image.mode == 'L':
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myimage = image
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colorSpace = 'DeviceGray'
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bpp = 1
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else:
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myimage = image.convert('RGB')
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colorSpace = 'RGB'
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bpp = 3
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imgwidth, imgheight = myimage.size
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imagedata = ['BI /W %d /H %d /BPC %d /CS /%s /F [%s/Fl] ID' %
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(imgwidth, imgheight, bpc, colorSpace, rl_config.useA85 and '/A85 ' or '')]
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# this describes what is in the image itself
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# *NB* according to the spec you can only use the short form in inline images
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# use a flate filter and, optionally, Ascii Base 85 to compress
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raw = myimage.tostring()
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rowstride = (imgwidth * bpc * bpp + 7) / 8
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assert len(raw) == rowstride * imgheight, "Wrong amount of data for image"
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data = zlib.compress(raw) # this bit is very fast...
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imagedata = ['BI /W %d /H %d /BPC %d /CS /%s /F [%s/Fl] ID' %
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(imgwidth, imgheight, bpc, colorSpace, rl_config.useA85 and '/A85 ' or '')]
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if rl_config.useA85:
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# ...sadly this may not be
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data = _AsciiBase85Encode(data)
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# append in blocks of 60 characters
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_chunker(data, imagedata)
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imagedata.append('EI')
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return (imagedata, imgwidth, imgheight)
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# use a flate filter and, optionally, Ascii Base 85 to compress
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raw = myimage.tostring()
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rowstride = (imgwidth * bpc * bpp + 7) / 8
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assert len(raw) == rowstride * imgheight, "Wrong amount of data for image"
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data = zlib.compress(raw) # this bit is very fast...
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if rl_config.useA85:
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# ...sadly this may not be
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data = _AsciiBase85Encode(data)
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# append in blocks of 60 characters
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_chunker(data, imagedata)
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imagedata.append('EI')
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return (imagedata, imgwidth, imgheight)
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class hocrTransform():
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"""
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A class for converting documents from the hOCR format.
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For details of the hOCR format, see:
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http://docs.google.com/View?docid=dfxcv4vc_67g844kf
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"""
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def __init__(self, hocrFileName, dpi):
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self.dpi = dpi
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self.boxPattern = re.compile('bbox((\s+\d+){4})')
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class HocrTransform():
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self.hocr = ElementTree.ElementTree()
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self.hocr.parse(hocrFileName)
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"""
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A class for converting documents from the hOCR format.
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For details of the hOCR format, see:
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http://docs.google.com/View?docid=dfxcv4vc_67g844kf
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"""
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# if the hOCR file has a namespace, ElementTree requires its use to find elements
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matches = re.match('({.*})html', self.hocr.getroot().tag)
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self.xmlns = ''
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if matches:
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self.xmlns = matches.group(1)
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def __init__(self, hocrFileName, dpi):
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self.dpi = dpi
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self.boxPattern = re.compile('bbox((\s+\d+){4})')
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# get dimension in pt (not pixel!!!!) of the OCRed image
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self.width, self.height = None, None
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for div in self.hocr.findall(".//%sdiv[@class='ocr_page']"%(self.xmlns)):
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coords = self.element_coordinates(div)
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self.width = self.px2pt(coords[2]-coords[0])
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self.height = self.px2pt(coords[3]-coords[1])
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break # there shouldn't be more than one, and if there is, we don't want it
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self.hocr = ElementTree.ElementTree()
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self.hocr.parse(hocrFileName)
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# no width and heigh definition in the ocr_image element of the hocr file
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if self.width is None:
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print("No page dimension found in the hocr file")
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sys.exit(1)
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# if the hOCR file has a namespace, ElementTree requires its use to
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# find elements
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matches = re.match('({.*})html', self.hocr.getroot().tag)
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self.xmlns = ''
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if matches:
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self.xmlns = matches.group(1)
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def __str__(self):
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"""
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Return the textual content of the HTML body
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"""
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if self.hocr is None:
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return ''
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body = self.hocr.find(".//%sbody"%(self.xmlns))
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if body:
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return self._get_element_text(body).encode('utf-8') # XML gives unicode
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else:
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return ''
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# get dimension in pt (not pixel!!!!) of the OCRed image
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self.width, self.height = None, None
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for div in self.hocr.findall(".//%sdiv[@class='ocr_page']" % (self.xmlns)):
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coords = self.element_coordinates(div)
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self.width = self.px2pt(coords[2] - coords[0])
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self.height = self.px2pt(coords[3] - coords[1])
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# there shouldn't be more than one, and if there is, we don't want
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# it
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break
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def _get_element_text(self, element):
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"""
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Return the textual content of the element and its children
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"""
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text = ''
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if element.text is not None:
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text = text + element.text
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for child in element.getchildren():
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text = text + self._get_element_text(child)
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if element.tail is not None:
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text = text + element.tail
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return text
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# no width and heigh definition in the ocr_image element of the hocr
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# file
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if self.width is None:
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print("No page dimension found in the hocr file")
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sys.exit(1)
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def element_coordinates(self, element):
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"""
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Returns a tuple containing the coordinates of the bounding box around
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an element
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"""
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out = (0,0,0,0)
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if 'title' in element.attrib:
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matches = self.boxPattern.search(element.attrib['title'])
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if matches:
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coords = matches.group(1).split()
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out = (int(coords[0]),int(coords[1]),int(coords[2]),int(coords[3]))
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return out
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def __str__(self):
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"""
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Return the textual content of the HTML body
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"""
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if self.hocr is None:
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return ''
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body = self.hocr.find(".//%sbody" % (self.xmlns))
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if body:
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# XML gives unicode
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return self._get_element_text(body).encode('utf-8')
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else:
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return ''
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def px2pt(self, pxl):
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"""
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Returns the length in pt given length in pxl
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"""
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return float(pxl)/self.dpi*inch
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def _get_element_text(self, element):
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"""
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Return the textual content of the element and its children
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"""
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text = ''
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if element.text is not None:
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text = text + element.text
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for child in element.getchildren():
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text = text + self._get_element_text(child)
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if element.tail is not None:
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text = text + element.tail
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return text
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def replace_unsupported_chars(self, str):
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"""
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Given an input string, returns the corresponding string that:
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- is available in the helvetica facetype
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- does not contain any ligature (to allow easy search in the PDF file)
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"""
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# The 'u' before the character to replace indicates that it is a unicode character
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str=str.replace(u"fl","fl")
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str=str.replace(u"fi","fi")
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return str
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def to_pdf(self, outFileName, imageFileName, showBoundingboxes, fontname="Helvetica"):
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"""
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Creates a PDF file with an image superimposed on top of the text.
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Text is positioned according to the bounding box of the lines in
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the hOCR file.
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The image need not be identical to the image used to create the hOCR file.
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It can have a lower resolution, different color mode, etc.
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"""
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# create the PDF file
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pdf = Canvas(outFileName, pagesize=(self.width, self.height), pageCompression=1) # page size in points (1/72 in.)
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def element_coordinates(self, element):
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"""
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Returns a tuple containing the coordinates of the bounding box around
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an element
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"""
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out = (0, 0, 0, 0)
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if 'title' in element.attrib:
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matches = self.boxPattern.search(element.attrib['title'])
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if matches:
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coords = matches.group(1).split()
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out = (
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int(coords[0]), int(coords[1]), int(coords[2]), int(coords[3]))
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return out
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# draw bounding box for each paragraph
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pdf.setStrokeColorRGB(0,1,1) # light blue for bounding box of paragraph
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pdf.setFillColorRGB(0,1,1) # light blue for bounding box of paragraph
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pdf.setLineWidth(0) # no line for bounding box
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for elem in self.hocr.findall(".//%sp[@class='%s']" % (self.xmlns, "ocr_par")):
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def px2pt(self, pxl):
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"""
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Returns the length in pt given length in pxl
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"""
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return float(pxl) / self.dpi * inch
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elemtxt=self._get_element_text(elem).rstrip()
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if len(elemtxt) == 0:
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continue
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def replace_unsupported_chars(self, str):
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"""
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Given an input string, returns the corresponding string that:
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- is available in the helvetica facetype
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- does not contain any ligature (to allow easy search in the PDF file)
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"""
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# The 'u' before the character to replace indicates that it is a
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# unicode character
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str = str.replace(u"fl", "fl")
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str = str.replace(u"fi", "fi")
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return str
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coords = self.element_coordinates(elem)
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x1=self.px2pt(coords[0])
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y1=self.px2pt(coords[1])
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x2=self.px2pt(coords[2])
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y2=self.px2pt(coords[3])
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def to_pdf(self, outFileName, imageFileName, showBoundingboxes, fontname="Helvetica"):
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"""
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Creates a PDF file with an image superimposed on top of the text.
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Text is positioned according to the bounding box of the lines in
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the hOCR file.
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The image need not be identical to the image used to create the hOCR file.
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It can have a lower resolution, different color mode, etc.
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"""
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# create the PDF file
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# page size in points (1/72 in.)
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pdf = Canvas(
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outFileName, pagesize=(self.width, self.height), pageCompression=1)
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# draw the bbox border
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if showBoundingboxes == True:
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pdf.rect(x1, self.height-y2, x2-x1, y2-y1, fill=1)
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# draw bounding box for each paragraph
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# light blue for bounding box of paragraph
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pdf.setStrokeColorRGB(0, 1, 1)
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# light blue for bounding box of paragraph
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pdf.setFillColorRGB(0, 1, 1)
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pdf.setLineWidth(0) # no line for bounding box
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for elem in self.hocr.findall(".//%sp[@class='%s']" % (self.xmlns, "ocr_par")):
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elemtxt = self._get_element_text(elem).rstrip()
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if len(elemtxt) == 0:
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continue
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# check if element with class 'ocrx_word' are available
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# otherwise use 'ocr_line' as fallback
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elemclass="ocr_line"
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if self.hocr.find(".//%sspan[@class='ocrx_word']" %(self.xmlns)) is not None:
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elemclass="ocrx_word"
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coords = self.element_coordinates(elem)
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x1 = self.px2pt(coords[0])
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y1 = self.px2pt(coords[1])
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x2 = self.px2pt(coords[2])
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y2 = self.px2pt(coords[3])
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# itterate all text elements
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pdf.setStrokeColorRGB(1,0,0) # light green for bounding box of word/line
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pdf.setLineWidth(0.5) # bounding box line width
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pdf.setDash(6,3) # bounding box is dashed
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pdf.setFillColorRGB(0,0,0) # text in black
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for elem in self.hocr.findall(".//%sspan[@class='%s']" % (self.xmlns, elemclass)):
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# draw the bbox border
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if showBoundingboxes:
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pdf.rect(x1, self.height - y2, x2 - x1, y2 - y1, fill=1)
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elemtxt=self._get_element_text(elem).rstrip()
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elemtxt=self.replace_unsupported_chars(elemtxt)
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if len(elemtxt) == 0:
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continue
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# check if element with class 'ocrx_word' are available
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# otherwise use 'ocr_line' as fallback
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elemclass = "ocr_line"
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if self.hocr.find(".//%sspan[@class='ocrx_word']" % (self.xmlns)) is not None:
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elemclass = "ocrx_word"
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coords = self.element_coordinates(elem)
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x1=self.px2pt(coords[0])
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y1=self.px2pt(coords[1])
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x2=self.px2pt(coords[2])
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y2=self.px2pt(coords[3])
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# itterate all text elements
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# light green for bounding box of word/line
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pdf.setStrokeColorRGB(1, 0, 0)
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pdf.setLineWidth(0.5) # bounding box line width
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pdf.setDash(6, 3) # bounding box is dashed
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pdf.setFillColorRGB(0, 0, 0) # text in black
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for elem in self.hocr.findall(".//%sspan[@class='%s']" % (self.xmlns, elemclass)):
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# draw the bbox border
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if showBoundingboxes == True:
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pdf.rect(x1, self.height-y2, x2-x1, y2-y1, fill=0)
|
||||
elemtxt = self._get_element_text(elem).rstrip()
|
||||
|
||||
text = pdf.beginText()
|
||||
fontsize=self.px2pt(coords[3]-coords[1])
|
||||
text.setFont(fontname, fontsize)
|
||||
elemtxt = self.replace_unsupported_chars(elemtxt)
|
||||
|
||||
# set cursor to bottom left corner of bbox (adjust for dpi)
|
||||
text.setTextOrigin(x1, self.height-y2)
|
||||
if len(elemtxt) == 0:
|
||||
continue
|
||||
|
||||
# scale the width of the text to fill the width of the bbox
|
||||
text.setHorizScale(100*(x2-x1)/pdf.stringWidth(elemtxt, fontname, fontsize))
|
||||
coords = self.element_coordinates(elem)
|
||||
x1 = self.px2pt(coords[0])
|
||||
y1 = self.px2pt(coords[1])
|
||||
x2 = self.px2pt(coords[2])
|
||||
y2 = self.px2pt(coords[3])
|
||||
|
||||
# write the text to the page
|
||||
text.textLine(elemtxt)
|
||||
pdf.drawText(text)
|
||||
# draw the bbox border
|
||||
if showBoundingboxes:
|
||||
pdf.rect(x1, self.height - y2, x2 - x1, y2 - y1, fill=0)
|
||||
|
||||
# put the image on the page, scaled to fill the page
|
||||
if imageFileName != None:
|
||||
im = Image.open(imageFileName)
|
||||
pdf.drawInlineImage(im, 0, 0, width=self.width, height=self.height)
|
||||
text = pdf.beginText()
|
||||
fontsize = self.px2pt(coords[3] - coords[1])
|
||||
text.setFont(fontname, fontsize)
|
||||
|
||||
# finish up the page and save it
|
||||
pdf.showPage()
|
||||
pdf.save()
|
||||
# set cursor to bottom left corner of bbox (adjust for dpi)
|
||||
text.setTextOrigin(x1, self.height - y2)
|
||||
|
||||
# scale the width of the text to fill the width of the bbox
|
||||
text.setHorizScale(
|
||||
100 * (x2 - x1) / pdf.stringWidth(elemtxt, fontname, fontsize))
|
||||
|
||||
# write the text to the page
|
||||
text.textLine(elemtxt)
|
||||
pdf.drawText(text)
|
||||
|
||||
# put the image on the page, scaled to fill the page
|
||||
if imageFileName is not None:
|
||||
im = Image.open(imageFileName)
|
||||
pdf.drawInlineImage(im, 0, 0, width=self.width, height=self.height)
|
||||
|
||||
# finish up the page and save it
|
||||
pdf.showPage()
|
||||
pdf.save()
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
parser = argparse.ArgumentParser(description='Convert hocr file to PDF')
|
||||
parser.add_argument('-b', '--boundingboxes', action="store_true", default=False, help='Show bounding boxes borders')
|
||||
parser.add_argument('-r', '--resolution', type=int, default=300, help='Resolution of the image that was OCRed')
|
||||
parser.add_argument('-i', '--image', default=None, help='Path to the image to be placed above the text')
|
||||
parser.add_argument('hocrfile', help='Path to the hocr file to be parsed')
|
||||
parser.add_argument('outputfile', help='Path to the PDF file to be generated')
|
||||
args = parser.parse_args()
|
||||
|
||||
hocr = hocrTransform(args.hocrfile, args.resolution)
|
||||
hocr.to_pdf(args.outputfile, args.image, args.boundingboxes)
|
||||
|
||||
|
||||
parser = argparse.ArgumentParser(description='Convert hocr file to PDF')
|
||||
parser.add_argument('-b', '--boundingboxes', action="store_true",
|
||||
default=False, help='Show bounding boxes borders')
|
||||
parser.add_argument('-r', '--resolution', type=int,
|
||||
default=300, help='Resolution of the image that was OCRed')
|
||||
parser.add_argument('-i', '--image', default=None,
|
||||
help='Path to the image to be placed above the text')
|
||||
parser.add_argument('hocrfile', help='Path to the hocr file to be parsed')
|
||||
parser.add_argument(
|
||||
'outputfile', help='Path to the PDF file to be generated')
|
||||
args = parser.parse_args()
|
||||
|
||||
hocr = HocrTransform(args.hocrfile, args.resolution)
|
||||
hocr.to_pdf(args.outputfile, args.image, args.boundingboxes)
|
||||
|
||||
@ -206,13 +206,13 @@ else
|
||||
image4finalPDF="$curImgPixmapDeskewed"
|
||||
fi
|
||||
[ $VERBOSITY -ge $LOG_DEBUG ] && echo "Page $page: Embedding text in PDF"
|
||||
! python2 $SRC/hocrTransform.py -r $dpi -i "$image4finalPDF" "$curHocr" "$curOCRedPDF" \
|
||||
! python2 $SRC/hocrtransform.py -r $dpi -i "$image4finalPDF" "$curHocr" "$curOCRedPDF" \
|
||||
&& echo "Could not create PDF file from \"$curHocr\". Exiting..." && exit $EXIT_OTHER_ERROR
|
||||
|
||||
# if requested generate special debug PDF page with visible OCR text
|
||||
if [ $PDF_NOIMG -eq "1" ] ; then
|
||||
[ $VERBOSITY -ge $LOG_DEBUG ] && echo "Page $page: Embedding text in PDF (debug page)"
|
||||
! python2 $SRC/hocrTransform.py -b -r $dpi "$curHocr" "$curOCRedPDFDebug" \
|
||||
! python2 $SRC/hocrtransform.py -b -r $dpi "$curHocr" "$curOCRedPDFDebug" \
|
||||
&& echo "Could not create PDF file from \"$curHocr\". Exiting..." && exit $EXIT_OTHER_ERROR
|
||||
fi
|
||||
|
||||
|
||||
@ -577,7 +577,7 @@ def render_page(infiles, output_file):
|
||||
# -It is written as a standalone script; not meant for import yet
|
||||
args_hocrTransform = [
|
||||
'python2',
|
||||
os.path.join(basedir, 'hocrTransform.py'),
|
||||
os.path.join(basedir, 'hocrtransform.py'),
|
||||
'-r', str(round(max(pageinfo['xres'], pageinfo['yres']))),
|
||||
'-i', infiles[1],
|
||||
infiles[0],
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user