642 lines
20 KiB
Python
642 lines
20 KiB
Python
from __future__ import division
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import shutil
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import tempfile
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import warnings
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from itertools import groupby
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from operator import itemgetter
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import numpy as np
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from pdfminer.pdfparser import PDFParser
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from pdfminer.pdfdocument import PDFDocument
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from pdfminer.pdfpage import PDFPage
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from pdfminer.pdfpage import PDFTextExtractionNotAllowed
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from pdfminer.pdfinterp import PDFResourceManager
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from pdfminer.pdfinterp import PDFPageInterpreter
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from pdfminer.converter import PDFPageAggregator
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from pdfminer.layout import (LAParams, LTAnno, LTChar, LTTextLineHorizontal,
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LTTextLineVertical)
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stream_kwargs = [
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'columns',
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'row_close_tol',
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'col_close_tol'
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]
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lattice_kwargs = [
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'process_background',
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'line_size_scaling',
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'copy_text',
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'shift_text',
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'line_close_tol',
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'joint_close_tol',
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'threshold_blocksize',
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'threshold_constant',
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'iterations'
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]
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def validate_input(kwargs, flavor='lattice'):
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def check_intersection(parser_kwargs, input_kwargs):
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isec = set(parser_kwargs).intersection(set(input_kwargs.keys()))
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if isec:
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raise ValueError("{} cannot be used with flavor='{}'".format(
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",".join(sorted(isec)), flavor))
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if flavor == 'lattice':
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check_intersection(stream_kwargs, kwargs)
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else:
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check_intersection(lattice_kwargs, kwargs)
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def remove_extra(kwargs, flavor='lattice'):
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if flavor == 'lattice':
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for key in kwargs.keys():
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if key in stream_kwargs:
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kwargs.pop(key)
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else:
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for key in kwargs.keys():
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if key in lattice_kwargs:
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kwargs.pop(key)
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return kwargs
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# https://stackoverflow.com/a/22726782
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class TemporaryDirectory(object):
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def __enter__(self):
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self.name = tempfile.mkdtemp()
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return self.name
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def __exit__(self, exc_type, exc_value, traceback):
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shutil.rmtree(self.name)
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def translate(x1, x2):
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"""Translates x2 by x1.
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Parameters
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----------
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x1 : float
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x2 : float
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Returns
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-------
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x2 : float
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"""
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x2 += x1
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return x2
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def scale(x, s):
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"""Scales x by scaling factor s.
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Parameters
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----------
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x : float
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s : float
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Returns
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-------
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x : float
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"""
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x *= s
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return x
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def scale_pdf(k, factors):
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"""Translates and scales pdf coordinate space to image
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coordinate space.
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Parameters
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----------
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k : tuple
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Tuple (x1, y1, x2, y2) representing table bounding box where
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(x1, y1) -> lt and (x2, y2) -> rb in PDFMiner coordinate
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space.
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factors : tuple
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Tuple (scaling_factor_x, scaling_factor_y, pdf_y) where the
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first two elements are scaling factors and pdf_y is height of
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pdf.
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Returns
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-------
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knew : tuple
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Tuple (x1, y1, x2, y2) representing table bounding box where
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(x1, y1) -> lt and (x2, y2) -> rb in OpenCV coordinate
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space.
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"""
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x1, y1, x2, y2 = k
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scaling_factor_x, scaling_factor_y, pdf_y = factors
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x1 = scale(x1, scaling_factor_x)
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y1 = scale(abs(translate(-pdf_y, y1)), scaling_factor_y)
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x2 = scale(x2, scaling_factor_x)
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y2 = scale(abs(translate(-pdf_y, y2)), scaling_factor_y)
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knew = (int(x1), int(y1), int(x2), int(y2))
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return knew
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def scale_image(tables, v_segments, h_segments, factors):
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"""Translates and scales image coordinate space to pdf
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coordinate space.
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Parameters
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----------
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tables : dict
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Dict with table boundaries as keys and list of intersections
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in that boundary as value.
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v_segments : list
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List of vertical line segments.
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h_segments : list
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List of horizontal line segments.
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factors : tuple
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Tuple (scaling_factor_x, scaling_factor_y, img_y) where the
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first two elements are scaling factors and img_y is height of
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image.
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Returns
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-------
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tables_new : dict
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v_segments_new : dict
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h_segments_new : dict
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"""
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scaling_factor_x, scaling_factor_y, img_y = factors
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tables_new = {}
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for k in tables.keys():
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x1, y1, x2, y2 = k
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x1 = scale(x1, scaling_factor_x)
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y1 = scale(abs(translate(-img_y, y1)), scaling_factor_y)
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x2 = scale(x2, scaling_factor_x)
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y2 = scale(abs(translate(-img_y, y2)), scaling_factor_y)
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j_x, j_y = zip(*tables[k])
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j_x = [scale(j, scaling_factor_x) for j in j_x]
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j_y = [scale(abs(translate(-img_y, j)), scaling_factor_y) for j in j_y]
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joints = zip(j_x, j_y)
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tables_new[(x1, y1, x2, y2)] = joints
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v_segments_new = []
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for v in v_segments:
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x1, x2 = scale(v[0], scaling_factor_x), scale(v[2], scaling_factor_x)
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y1, y2 = scale(abs(translate(-img_y, v[1])), scaling_factor_y), scale(
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abs(translate(-img_y, v[3])), scaling_factor_y)
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v_segments_new.append((x1, y1, x2, y2))
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h_segments_new = []
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for h in h_segments:
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x1, x2 = scale(h[0], scaling_factor_x), scale(h[2], scaling_factor_x)
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y1, y2 = scale(abs(translate(-img_y, h[1])), scaling_factor_y), scale(
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abs(translate(-img_y, h[3])), scaling_factor_y)
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h_segments_new.append((x1, y1, x2, y2))
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return tables_new, v_segments_new, h_segments_new
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def get_rotation(lttextlh, lttextlv, ltchar):
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"""Detects if text in table is rotated or not using the current
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transformation matrix (CTM) and returns its orientation.
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Parameters
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----------
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lttextlh : list
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List of PDFMiner LTTextLineHorizontal objects.
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lttextlv : list
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List of PDFMiner LTTextLineVertical objects.
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ltchar : list
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List of PDFMiner LTChar objects.
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Returns
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-------
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rotation : string
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'' if text in table is upright, 'anticlockwise' if
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rotated 90 degree anticlockwise and 'clockwise' if
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rotated 90 degree clockwise.
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"""
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rotation = ''
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hlen = len([t for t in lttextlh if t.get_text().strip()])
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vlen = len([t for t in lttextlv if t.get_text().strip()])
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if hlen < vlen:
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clockwise = sum(t.matrix[1] < 0 and t.matrix[2] > 0 for t in ltchar)
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anticlockwise = sum(t.matrix[1] > 0 and t.matrix[2] < 0 for t in ltchar)
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rotation = 'anticlockwise' if clockwise < anticlockwise else 'clockwise'
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return rotation
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def segments_in_bbox(bbox, v_segments, h_segments):
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"""Returns all line segments present inside a bounding box.
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Parameters
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----------
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bbox : tuple
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Tuple (x1, y1, x2, y2) representing a bounding box where
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(x1, y1) -> lb and (x2, y2) -> rt in PDFMiner coordinate
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space.
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v_segments : list
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List of vertical line segments.
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h_segments : list
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List of vertical horizontal segments.
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Returns
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-------
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v_s : list
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List of vertical line segments that lie inside table.
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h_s : list
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List of horizontal line segments that lie inside table.
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"""
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lb = (bbox[0], bbox[1])
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rt = (bbox[2], bbox[3])
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v_s = [v for v in v_segments if v[1] > lb[1] - 2 and
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v[3] < rt[1] + 2 and lb[0] - 2 <= v[0] <= rt[0] + 2]
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h_s = [h for h in h_segments if h[0] > lb[0] - 2 and
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h[2] < rt[0] + 2 and lb[1] - 2 <= h[1] <= rt[1] + 2]
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return v_s, h_s
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def text_in_bbox(bbox, text):
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"""Returns all text objects present inside a bounding box.
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Parameters
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----------
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bbox : tuple
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Tuple (x1, y1, x2, y2) representing a bounding box where
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(x1, y1) -> lb and (x2, y2) -> rt in PDFMiner coordinate
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space.
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text : List of PDFMiner text objects.
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Returns
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-------
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t_bbox : list
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List of PDFMiner text objects that lie inside table.
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"""
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lb = (bbox[0], bbox[1])
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rt = (bbox[2], bbox[3])
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t_bbox = [t for t in text if lb[0] - 2 <= (t.x0 + t.x1) / 2.0
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<= rt[0] + 2 and lb[1] - 2 <= (t.y0 + t.y1) / 2.0
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<= rt[1] + 2]
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return t_bbox
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def merge_close_lines(ar, line_close_tol=2):
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"""Merges lines which are within a tolerance by calculating a
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moving mean, based on their x or y axis projections.
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Parameters
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----------
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ar : list
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line_close_tol : int, optional (default: 2)
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Returns
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-------
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ret : list
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"""
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ret = []
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for a in ar:
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if not ret:
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ret.append(a)
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else:
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temp = ret[-1]
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if np.isclose(temp, a, atol=line_close_tol):
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temp = (temp + a) / 2.0
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ret[-1] = temp
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else:
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ret.append(a)
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return ret
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def flag_font_size(textline, direction):
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"""Flags super/subscripts in text by enclosing them with <s></s>.
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May give false positives.
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Parameters
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----------
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textline : list
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List of PDFMiner LTChar objects.
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direction : string
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Direction of the PDFMiner LTTextLine object.
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Returns
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-------
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fstring : string
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"""
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if direction == 'horizontal':
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d = [(t.get_text(), np.round(t.height, decimals=6)) for t in textline if not isinstance(t, LTAnno)]
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elif direction == 'vertical':
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d = [(t.get_text(), np.round(t.width, decimals=6)) for t in textline if not isinstance(t, LTAnno)]
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l = [np.round(size, decimals=6) for text, size in d]
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if len(set(l)) > 1:
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flist = []
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min_size = min(l)
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for key, chars in groupby(d, itemgetter(1)):
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if key == min_size:
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fchars = [t[0] for t in chars]
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if ''.join(fchars).strip():
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fchars.insert(0, '<s>')
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fchars.append('</s>')
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flist.append(''.join(fchars))
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else:
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fchars = [t[0] for t in chars]
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if ''.join(fchars).strip():
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flist.append(''.join(fchars))
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fstring = ''.join(flist).strip('\n')
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else:
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fstring = ''.join([t.get_text() for t in textline]).strip('\n')
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return fstring
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def split_textline(table, textline, direction, flag_size=False):
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"""Splits PDFMiner LTTextLine into substrings if it spans across
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multiple rows/columns.
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Parameters
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----------
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table : camelot.core.Table
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textline : object
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PDFMiner LTTextLine object.
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direction : string
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Direction of the PDFMiner LTTextLine object.
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flag_size : bool, optional (default: False)
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Whether or not to highlight a substring using <s></s>
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if its size is different from rest of the string. (Useful for
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super and subscripts.)
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Returns
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-------
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grouped_chars : list
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List of tuples of the form (idx, text) where idx is the index
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of row/column and text is the an lttextline substring.
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"""
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idx = 0
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cut_text = []
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bbox = textline.bbox
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try:
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if direction == 'horizontal' and not textline.is_empty():
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x_overlap = [i for i, x in enumerate(table.cols) if x[0] <= bbox[2] and bbox[0] <= x[1]]
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r_idx = [j for j, r in enumerate(table.rows) if r[1] <= (bbox[1] + bbox[3]) / 2 <= r[0]]
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r = r_idx[0]
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x_cuts = [(c, table.cells[r][c].x2) for c in x_overlap if table.cells[r][c].right]
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if not x_cuts:
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x_cuts = [(x_overlap[0], table.cells[r][-1].x2)]
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for obj in textline._objs:
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row = table.rows[r]
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for cut in x_cuts:
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if isinstance(obj, LTChar):
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if (row[1] <= (obj.y0 + obj.y1) / 2 <= row[0] and
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(obj.x0 + obj.x1) / 2 <= cut[1]):
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cut_text.append((r, cut[0], obj))
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break
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elif isinstance(obj, LTAnno):
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cut_text.append((r, cut[0], obj))
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elif direction == 'vertical' and not textline.is_empty():
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y_overlap = [j for j, y in enumerate(table.rows) if y[1] <= bbox[3] and bbox[1] <= y[0]]
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c_idx = [i for i, c in enumerate(table.cols) if c[0] <= (bbox[0] + bbox[2]) / 2 <= c[1]]
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c = c_idx[0]
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y_cuts = [(r, table.cells[r][c].y1) for r in y_overlap if table.cells[r][c].bottom]
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if not y_cuts:
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y_cuts = [(y_overlap[0], table.cells[-1][c].y1)]
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for obj in textline._objs:
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col = table.cols[c]
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for cut in y_cuts:
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if isinstance(obj, LTChar):
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if (col[0] <= (obj.x0 + obj.x1) / 2 <= col[1] and
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(obj.y0 + obj.y1) / 2 >= cut[1]):
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cut_text.append((cut[0], c, obj))
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break
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elif isinstance(obj, LTAnno):
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cut_text.append((cut[0], c, obj))
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except IndexError:
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return [(-1, -1, textline.get_text())]
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grouped_chars = []
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for key, chars in groupby(cut_text, itemgetter(0, 1)):
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if flag_size:
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grouped_chars.append((key[0], key[1], flag_font_size([t[2] for t in chars], direction)))
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else:
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gchars = [t[2].get_text() for t in chars]
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grouped_chars.append((key[0], key[1], ''.join(gchars).strip('\n')))
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return grouped_chars
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def get_table_index(table, t, direction, split_text=False, flag_size=False):
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"""Gets indices of the table cell where given text object lies by
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comparing their y and x-coordinates.
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Parameters
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----------
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table : camelot.core.Table
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t : object
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PDFMiner LTTextLine object.
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direction : string
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Direction of the PDFMiner LTTextLine object.
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split_text : bool, optional (default: False)
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Whether or not to split a text line if it spans across
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multiple cells.
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flag_size : bool, optional (default: False)
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Whether or not to highlight a substring using <s></s>
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if its size is different from rest of the string. (Useful for
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super and subscripts)
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Returns
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-------
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indices : list
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List of tuples of the form (r_idx, c_idx, text) where r_idx
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and c_idx are row and column indices.
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error : float
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Assignment error, percentage of text area that lies outside
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a cell.
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+-------+
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| |
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| [Text bounding box]
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| |
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+-------+
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"""
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r_idx, c_idx = [-1] * 2
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for r in range(len(table.rows)):
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if ((t.y0 + t.y1) / 2.0 < table.rows[r][0] and
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(t.y0 + t.y1) / 2.0 > table.rows[r][1]):
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lt_col_overlap = []
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for c in table.cols:
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if c[0] <= t.x1 and c[1] >= t.x0:
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left = t.x0 if c[0] <= t.x0 else c[0]
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right = t.x1 if c[1] >= t.x1 else c[1]
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lt_col_overlap.append(abs(left - right) / abs(c[0] - c[1]))
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else:
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lt_col_overlap.append(-1)
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if len(list(filter(lambda x: x != -1, lt_col_overlap))) == 0:
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text = t.get_text().strip('\n')
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text_range = (t.x0, t.x1)
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col_range = (table.cols[0][0], table.cols[-1][1])
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warnings.warn("{} {} does not lie in column range {}".format(
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text, text_range, col_range))
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r_idx = r
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c_idx = lt_col_overlap.index(max(lt_col_overlap))
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break
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# error calculation
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y0_offset, y1_offset, x0_offset, x1_offset = [0] * 4
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if t.y0 > table.rows[r_idx][0]:
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y0_offset = abs(t.y0 - table.rows[r_idx][0])
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if t.y1 < table.rows[r_idx][1]:
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y1_offset = abs(t.y1 - table.rows[r_idx][1])
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if t.x0 < table.cols[c_idx][0]:
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x0_offset = abs(t.x0 - table.cols[c_idx][0])
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if t.x1 > table.cols[c_idx][1]:
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x1_offset = abs(t.x1 - table.cols[c_idx][1])
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X = 1.0 if abs(t.x0 - t.x1) == 0.0 else abs(t.x0 - t.x1)
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Y = 1.0 if abs(t.y0 - t.y1) == 0.0 else abs(t.y0 - t.y1)
|
|
charea = X * Y
|
|
error = ((X * (y0_offset + y1_offset)) + (Y * (x0_offset + x1_offset))) / charea
|
|
|
|
if split_text:
|
|
return split_textline(table, t, direction, flag_size=flag_size), error
|
|
else:
|
|
if flag_size:
|
|
return [(r_idx, c_idx, flag_font_size(t._objs, direction))], error
|
|
else:
|
|
return [(r_idx, c_idx, t.get_text().strip('\n'))], error
|
|
|
|
|
|
def compute_accuracy(error_weights):
|
|
"""Calculates a score based on weights assigned to various
|
|
parameters and their error percentages.
|
|
|
|
Parameters
|
|
----------
|
|
error_weights : list
|
|
Two-dimensional list of the form [[p1, e1], [p2, e2], ...]
|
|
where pn is the weight assigned to list of errors en.
|
|
Sum of pn should be equal to 100.
|
|
|
|
Returns
|
|
-------
|
|
score : float
|
|
|
|
"""
|
|
SCORE_VAL = 100
|
|
try:
|
|
score = 0
|
|
if sum([ew[0] for ew in error_weights]) != SCORE_VAL:
|
|
raise ValueError("Sum of weights should be equal to 100.")
|
|
for ew in error_weights:
|
|
weight = ew[0] / len(ew[1])
|
|
for error_percentage in ew[1]:
|
|
score += weight * (1 - error_percentage)
|
|
except ZeroDivisionError:
|
|
score = 0
|
|
return score
|
|
|
|
|
|
def compute_whitespace(d):
|
|
"""Calculates the percentage of empty strings in a
|
|
two-dimensional list.
|
|
|
|
Parameters
|
|
----------
|
|
d : list
|
|
|
|
Returns
|
|
-------
|
|
whitespace : float
|
|
Percentage of empty cells.
|
|
|
|
"""
|
|
whitespace = 0
|
|
r_nempty_cells, c_nempty_cells = [], []
|
|
for i in d:
|
|
for j in i:
|
|
if j.strip() == '':
|
|
whitespace += 1
|
|
whitespace = 100 * (whitespace / float(len(d) * len(d[0])))
|
|
return whitespace
|
|
|
|
|
|
def get_page_layout(filename, char_margin=1.0, line_margin=0.5, word_margin=0.1,
|
|
detect_vertical=True, all_texts=True):
|
|
"""Returns a PDFMiner LTPage object and page dimension of a single
|
|
page pdf. See https://euske.github.io/pdfminer/ to get definitions
|
|
of kwargs.
|
|
|
|
Parameters
|
|
----------
|
|
filename : string
|
|
Path to pdf file.
|
|
char_margin : float
|
|
line_margin : float
|
|
word_margin : float
|
|
detect_vertical : bool
|
|
all_texts : bool
|
|
|
|
Returns
|
|
-------
|
|
layout : object
|
|
PDFMiner LTPage object.
|
|
dim : tuple
|
|
Dimension of pdf page in the form (width, height).
|
|
|
|
"""
|
|
with open(filename, 'rb') as f:
|
|
parser = PDFParser(f)
|
|
document = PDFDocument(parser)
|
|
if not document.is_extractable:
|
|
raise PDFTextExtractionNotAllowed
|
|
laparams = LAParams(char_margin=char_margin,
|
|
line_margin=line_margin,
|
|
word_margin=word_margin,
|
|
detect_vertical=detect_vertical,
|
|
all_texts=all_texts)
|
|
rsrcmgr = PDFResourceManager()
|
|
device = PDFPageAggregator(rsrcmgr, laparams=laparams)
|
|
interpreter = PDFPageInterpreter(rsrcmgr, device)
|
|
for page in PDFPage.create_pages(document):
|
|
interpreter.process_page(page)
|
|
layout = device.get_result()
|
|
width = layout.bbox[2]
|
|
height = layout.bbox[3]
|
|
dim = (width, height)
|
|
return layout, dim
|
|
|
|
|
|
def get_text_objects(layout, ltype="char", t=None):
|
|
"""Recursively parses pdf layout to get a list of
|
|
PDFMiner text objects.
|
|
|
|
Parameters
|
|
----------
|
|
layout : object
|
|
PDFMiner LTPage object.
|
|
ltype : string
|
|
Specify 'char', 'lh', 'lv' to get LTChar, LTTextLineHorizontal,
|
|
and LTTextLineVertical objects respectively.
|
|
t : list
|
|
|
|
Returns
|
|
-------
|
|
t : list
|
|
List of PDFMiner text objects.
|
|
|
|
"""
|
|
if ltype == "char":
|
|
LTObject = LTChar
|
|
elif ltype == "lh":
|
|
LTObject = LTTextLineHorizontal
|
|
elif ltype == "lv":
|
|
LTObject = LTTextLineVertical
|
|
if t is None:
|
|
t = []
|
|
try:
|
|
for obj in layout._objs:
|
|
if isinstance(obj, LTObject):
|
|
t.append(obj)
|
|
else:
|
|
t += get_text_objects(obj, ltype=ltype)
|
|
except AttributeError:
|
|
pass
|
|
return t
|