Add stream and lattice to parsers
Vinayak Mehta
parent
5d29f0c21c
commit
e3aabb720f
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@ -1,6 +1,3 @@
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from .core import *
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from .__version__ import __version__
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from .__version__ import __version__
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from .io import *
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def read_pdf(filepath, pages='1', grid=True):
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pass
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@ -0,0 +1 @@
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import click
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@ -10,7 +10,6 @@ from .utils import get_page_layout, get_text_objects, get_rotation
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class Cell(object):
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class Cell(object):
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def __init__(self, x1, y1, x2, y2):
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def __init__(self, x1, y1, x2, y2):
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self.x1 = x1
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self.x1 = x1
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self.y1 = y1
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self.y1 = y1
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self.x2 = x2
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self.x2 = x2
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@ -30,6 +29,9 @@ class Cell(object):
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self.spanning_v = False
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self.spanning_v = False
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self.image = None
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self.image = None
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def __repr__(self):
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pass
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def add_text(self, text):
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def add_text(self, text):
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self.text = ''.join([self.text, text])
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self.text = ''.join([self.text, text])
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@ -49,7 +51,6 @@ class Cell(object):
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class Table(object):
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class Table(object):
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def __init__(self, cols, rows):
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def __init__(self, cols, rows):
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self.cols = cols
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self.cols = cols
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self.rows = rows
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self.rows = rows
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self.cells = [[Cell(c[0], r[1], c[1], r[0])
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self.cells = [[Cell(c[0], r[1], c[1], r[0])
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@ -57,6 +58,9 @@ class Table(object):
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self.nocont_ = 0
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self.nocont_ = 0
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self.image = None
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self.image = None
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def __repr__(self):
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pass
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def set_all_edges(self):
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def set_all_edges(self):
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for r in range(len(self.rows)):
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for r in range(len(self.rows)):
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for c in range(len(self.cols)):
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for c in range(len(self.cols)):
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@ -230,7 +234,11 @@ class Table(object):
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class TableSet(object):
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class TableSet(object):
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pass
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def __init__(self):
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pass
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def __repr__(self):
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pass
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class FileHandler(object):
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class FileHandler(object):
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@ -0,0 +1,5 @@
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from .core import *
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def read_pdf(filepath, pages='1', grid=True):
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pass
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@ -1,382 +0,0 @@
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from __future__ import division
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import os
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import sys
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import copy
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import types
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import logging
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import copy_reg
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import warnings
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import subprocess
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from .core import Table
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from .imgproc import (adaptive_threshold, find_lines, find_table_contours,
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find_table_joints)
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from .utils import (scale_to_pdf, scale_to_image, segments_bbox, text_in_bbox,
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merge_close_values, get_table_index, get_score, count_empty,
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encode_list, get_text_objects, get_page_layout)
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__all__ = ['Lattice']
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logger = logging.getLogger('app_logger')
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def _reduce_method(m):
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if m.im_self is None:
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return getattr, (m.im_class, m.im_func.func_name)
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else:
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return getattr, (m.im_self, m.im_func.func_name)
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copy_reg.pickle(types.MethodType, _reduce_method)
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def _reduce_index(t, idx, shift_text):
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"""Reduces index of a text object if it lies within a spanning
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cell.
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Parameters
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----------
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table : object
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camelot.table.Table
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idx : list
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List of tuples of the form (r_idx, c_idx, text).
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shift_text : list
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{'l', 'r', 't', 'b'}
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Select one or more from above and pass them as a list to
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specify where the text in a spanning cell should flow.
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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 (idx, text) where idx is the reduced
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index of row/column and text is the an lttextline substring.
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"""
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indices = []
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for r_idx, c_idx, text in idx:
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for d in shift_text:
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if d == 'l':
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if t.cells[r_idx][c_idx].spanning_h:
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while not t.cells[r_idx][c_idx].left:
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c_idx -= 1
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if d == 'r':
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if t.cells[r_idx][c_idx].spanning_h:
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while not t.cells[r_idx][c_idx].right:
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c_idx += 1
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if d == 't':
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if t.cells[r_idx][c_idx].spanning_v:
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while not t.cells[r_idx][c_idx].top:
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r_idx -= 1
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if d == 'b':
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if t.cells[r_idx][c_idx].spanning_v:
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while not t.cells[r_idx][c_idx].bottom:
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r_idx += 1
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indices.append((r_idx, c_idx, text))
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return indices
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def _fill_spanning(t, fill=None):
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"""Fills spanning cells.
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Parameters
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----------
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t : object
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camelot.table.Table
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fill : list
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{'h', 'v'}
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Specify to fill spanning cells in horizontal or vertical
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direction.
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(optional, default: None)
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Returns
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-------
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t : object
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camelot.table.Table
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"""
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for f in fill:
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if f == "h":
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for i in range(len(t.cells)):
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for j in range(len(t.cells[i])):
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if t.cells[i][j].get_text().strip() == '':
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if t.cells[i][j].spanning_h and not t.cells[i][j].left:
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t.cells[i][j].add_text(t.cells[i][j - 1].get_text())
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elif f == "v":
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for i in range(len(t.cells)):
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for j in range(len(t.cells[i])):
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if t.cells[i][j].get_text().strip() == '':
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if t.cells[i][j].spanning_v and not t.cells[i][j].top:
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t.cells[i][j].add_text(t.cells[i - 1][j].get_text())
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return t
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class Lattice:
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"""Lattice looks for lines in the pdf to form a table.
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If you want to give fill and mtol for each table when specifying
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multiple table areas, make sure that the length of fill and mtol
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is equal to the length of table_area. Mapping between them is based
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on index.
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Parameters
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----------
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table_area : list
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List of strings of the form x1,y1,x2,y2 where
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(x1, y1) -> left-top and (x2, y2) -> right-bottom in PDFMiner's
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coordinate space, denoting table areas to analyze.
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(optional, default: None)
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fill : list
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List of strings specifying directions to fill spanning cells.
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{'h', 'v'} to fill spanning cells in horizontal or vertical
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direction.
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(optional, default: None)
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mtol : list
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List of ints specifying m-tolerance parameters.
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(optional, default: [2])
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jtol : list
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List of ints specifying j-tolerance parameters.
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(optional, default: [2])
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blocksize : int
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Size of a pixel neighborhood that is used to calculate a
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threshold value for the pixel: 3, 5, 7, and so on.
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(optional, default: 15)
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threshold_constant : float
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Constant subtracted from the mean or weighted mean
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(see the details below). Normally, it is positive but may be
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zero or negative as well.
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(optional, default: -2)
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scale : int
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Used to divide the height/width of a pdf to get a structuring
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element for image processing.
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(optional, default: 15)
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iterations : int
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Number of iterations for dilation.
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(optional, default: 0)
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invert : bool
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Whether or not to invert the image. Useful when pdfs have
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tables with lines in background.
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(optional, default: False)
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margins : tuple
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PDFMiner margins. (char_margin, line_margin, word_margin)
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(optional, default: (1.0, 0.5, 0.1))
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split_text : bool
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Whether or not to split a text line if it spans across
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different cells.
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(optional, default: False)
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flag_size : bool
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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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(optional, default: True)
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shift_text : list
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{'l', 'r', 't', 'b'}
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Select one or more from above and pass them as a list to
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specify where the text in a spanning cell should flow.
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(optional, default: ['l', 't'])
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debug : string
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{'contour', 'line', 'joint', 'table'}
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Set to one of the above values to generate a matplotlib plot
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of detected contours, lines, joints and the table generated.
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(optional, default: None)
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"""
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def __init__(self, table_area=None, fill=None, mtol=[2], jtol=[2],
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blocksize=15, threshold_constant=-2, scale=15, iterations=0,
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invert=False, margins=(1.0, 0.5, 0.1), split_text=False,
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flag_size=True, shift_text=['l', 't'], debug=None):
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self.method = 'lattice'
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self.table_area = table_area
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self.fill = fill
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self.mtol = mtol
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self.jtol = jtol
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self.blocksize = blocksize
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self.threshold_constant = threshold_constant
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self.scale = scale
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self.iterations = iterations
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self.invert = invert
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self.char_margin, self.line_margin, self.word_margin = margins
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self.split_text = split_text
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self.flag_size = flag_size
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self.shift_text = shift_text
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self.debug = debug
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def get_tables(self, pdfname):
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"""Expects a single page pdf as input with rotation corrected.
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Parameters
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----------
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pdfname : string
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Path to single page pdf file.
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Returns
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-------
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page : dict
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"""
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layout, dim = get_page_layout(pdfname, char_margin=self.char_margin,
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line_margin=self.line_margin, word_margin=self.word_margin)
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lttextlh = get_text_objects(layout, ltype="lh")
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lttextlv = get_text_objects(layout, ltype="lv")
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ltchar = get_text_objects(layout, ltype="char")
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width, height = dim
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bname, __ = os.path.splitext(pdfname)
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logger.info('Processing {0}.'.format(os.path.basename(bname)))
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if not ltchar:
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warnings.warn("{0}: Page contains no text.".format(
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os.path.basename(bname)))
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return {os.path.basename(bname): None}
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imagename = ''.join([bname, '.png'])
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gs_call = [
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"-q", "-sDEVICE=png16m", "-o", imagename, "-r600", pdfname
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]
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if "ghostscript" in subprocess.check_output(["gs", "-version"]).lower():
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gs_call.insert(0, "gs")
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else:
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gs_call.insert(0, "gsc")
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subprocess.call(gs_call, stdout=open(os.devnull, 'w'),
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stderr=subprocess.STDOUT)
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img, threshold = adaptive_threshold(imagename, invert=self.invert,
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blocksize=self.blocksize, c=self.threshold_constant)
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pdf_x = width
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pdf_y = height
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img_x = img.shape[1]
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img_y = img.shape[0]
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sc_x_image = img_x / float(pdf_x)
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sc_y_image = img_y / float(pdf_y)
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sc_x_pdf = pdf_x / float(img_x)
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sc_y_pdf = pdf_y / float(img_y)
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factors_image = (sc_x_image, sc_y_image, pdf_y)
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factors_pdf = (sc_x_pdf, sc_y_pdf, img_y)
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vmask, v_segments = find_lines(threshold, direction='vertical',
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scale=self.scale, iterations=self.iterations)
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hmask, h_segments = find_lines(threshold, direction='horizontal',
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scale=self.scale, iterations=self.iterations)
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if self.table_area is not None:
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areas = []
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for area in self.table_area:
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x1, y1, x2, y2 = area.split(",")
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x1 = float(x1)
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y1 = float(y1)
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x2 = float(x2)
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y2 = float(y2)
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x1, y1, x2, y2 = scale_to_image((x1, y1, x2, y2), factors_image)
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areas.append((x1, y1, abs(x2 - x1), abs(y2 - y1)))
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table_bbox = find_table_joints(areas, vmask, hmask)
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else:
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contours = find_table_contours(vmask, hmask)
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table_bbox = find_table_joints(contours, vmask, hmask)
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if len(self.mtol) == 1 and self.mtol[0] == 2:
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mtolerance = copy.deepcopy(self.mtol) * len(table_bbox)
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else:
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mtolerance = copy.deepcopy(self.mtol)
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if len(self.jtol) == 1 and self.jtol[0] == 2:
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jtolerance = copy.deepcopy(self.jtol) * len(table_bbox)
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else:
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jtolerance = copy.deepcopy(self.jtol)
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if self.debug:
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self.debug_images = (img, table_bbox)
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table_bbox, v_segments, h_segments = scale_to_pdf(table_bbox, v_segments,
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h_segments, factors_pdf)
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if self.debug:
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self.debug_segments = (v_segments, h_segments)
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self.debug_tables = []
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page = {}
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tables = {}
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# sort tables based on y-coord
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for table_no, k in enumerate(sorted(table_bbox.keys(), key=lambda x: x[1], reverse=True)):
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# select elements which lie within table_bbox
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table_data = {}
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t_bbox = {}
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|
||||||
v_s, h_s = segments_bbox(k, v_segments, h_segments)
|
|
||||||
t_bbox['horizontal'] = text_in_bbox(k, lttextlh)
|
|
||||||
t_bbox['vertical'] = text_in_bbox(k, lttextlv)
|
|
||||||
char_bbox = text_in_bbox(k, ltchar)
|
|
||||||
table_data['text_p'] = 100 * (1 - (len(char_bbox) / len(ltchar)))
|
|
||||||
for direction in t_bbox:
|
|
||||||
t_bbox[direction].sort(key=lambda x: (-x.y0, x.x0))
|
|
||||||
cols, rows = zip(*table_bbox[k])
|
|
||||||
cols, rows = list(cols), list(rows)
|
|
||||||
cols.extend([k[0], k[2]])
|
|
||||||
rows.extend([k[1], k[3]])
|
|
||||||
# sort horizontal and vertical segments
|
|
||||||
cols = merge_close_values(sorted(cols), mtol=mtolerance[table_no])
|
|
||||||
rows = merge_close_values(
|
|
||||||
sorted(rows, reverse=True), mtol=mtolerance[table_no])
|
|
||||||
# make grid using x and y coord of shortlisted rows and cols
|
|
||||||
cols = [(cols[i], cols[i + 1])
|
|
||||||
for i in range(0, len(cols) - 1)]
|
|
||||||
rows = [(rows[i], rows[i + 1])
|
|
||||||
for i in range(0, len(rows) - 1)]
|
|
||||||
|
|
||||||
table = Table(cols, rows)
|
|
||||||
# set table edges to True using ver+hor lines
|
|
||||||
table = table.set_edges(v_s, h_s, jtol=jtolerance[table_no])
|
|
||||||
nouse = table.nocont_ / (len(v_s) + len(h_s))
|
|
||||||
table_data['line_p'] = 100 * (1 - nouse)
|
|
||||||
# set spanning cells to True
|
|
||||||
table = table.set_spanning()
|
|
||||||
# set table border edges to True
|
|
||||||
table = table.set_border_edges()
|
|
||||||
|
|
||||||
if self.debug:
|
|
||||||
self.debug_tables.append(table)
|
|
||||||
|
|
||||||
assignment_errors = []
|
|
||||||
table_data['split_text'] = []
|
|
||||||
table_data['superscript'] = []
|
|
||||||
for direction in ['vertical', 'horizontal']:
|
|
||||||
for t in t_bbox[direction]:
|
|
||||||
indices, error = get_table_index(
|
|
||||||
table, t, direction, split_text=self.split_text,
|
|
||||||
flag_size=self.flag_size)
|
|
||||||
if indices[:2] != (-1, -1):
|
|
||||||
assignment_errors.append(error)
|
|
||||||
indices = _reduce_index(table, indices, shift_text=self.shift_text)
|
|
||||||
if len(indices) > 1:
|
|
||||||
table_data['split_text'].append(indices)
|
|
||||||
for r_idx, c_idx, text in indices:
|
|
||||||
if all(s in text for s in ['<s>', '</s>']):
|
|
||||||
table_data['superscript'].append((r_idx, c_idx, text))
|
|
||||||
table.cells[r_idx][c_idx].add_text(text)
|
|
||||||
score = get_score([[100, assignment_errors]])
|
|
||||||
table_data['score'] = score
|
|
||||||
|
|
||||||
if self.fill is not None:
|
|
||||||
table = _fill_spanning(table, fill=self.fill)
|
|
||||||
ar = table.get_list()
|
|
||||||
ar = encode_list(ar)
|
|
||||||
table_data['data'] = ar
|
|
||||||
empty_p, r_nempty_cells, c_nempty_cells = count_empty(ar)
|
|
||||||
table_data['empty_p'] = empty_p
|
|
||||||
table_data['r_nempty_cells'] = r_nempty_cells
|
|
||||||
table_data['c_nempty_cells'] = c_nempty_cells
|
|
||||||
table_data['nrows'] = len(ar)
|
|
||||||
table_data['ncols'] = len(ar[0])
|
|
||||||
tables['table-{0}'.format(table_no + 1)] = table_data
|
|
||||||
page[os.path.basename(bname)] = tables
|
|
||||||
|
|
||||||
if self.debug:
|
|
||||||
return None
|
|
||||||
|
|
||||||
return page
|
|
||||||
|
|
@ -1,19 +1,24 @@
|
||||||
from __future__ import division
|
from __future__ import division
|
||||||
import os
|
import os
|
||||||
|
import sys
|
||||||
import copy
|
import copy
|
||||||
import types
|
import types
|
||||||
import logging
|
import logging
|
||||||
import copy_reg
|
import copy_reg
|
||||||
import warnings
|
import warnings
|
||||||
|
import subprocess
|
||||||
|
|
||||||
import numpy as np
|
import numpy as np
|
||||||
|
|
||||||
from .core import Table
|
from .core import TableSet
|
||||||
from .utils import (text_in_bbox, get_table_index, get_score, count_empty,
|
from .image_processing import (adaptive_threshold, find_lines, find_table_contours,
|
||||||
|
find_table_joints)
|
||||||
|
from .utils import (scale_to_pdf, scale_to_image, segments_bbox, text_in_bbox,
|
||||||
|
merge_close_values, get_table_index, get_score, count_empty,
|
||||||
encode_list, get_text_objects, get_page_layout)
|
encode_list, get_text_objects, get_page_layout)
|
||||||
|
|
||||||
|
|
||||||
__all__ = ['Stream']
|
__all__ = ['Stream', 'Lattice']
|
||||||
logger = logging.getLogger('app_logger')
|
logger = logging.getLogger('app_logger')
|
||||||
|
|
||||||
|
|
||||||
|
|
@ -425,4 +430,358 @@ class Stream:
|
||||||
tables['table-{0}'.format(table_no + 1)] = table_data
|
tables['table-{0}'.format(table_no + 1)] = table_data
|
||||||
page[os.path.basename(bname)] = tables
|
page[os.path.basename(bname)] = tables
|
||||||
|
|
||||||
|
return page
|
||||||
|
|
||||||
|
|
||||||
|
def _reduce_index(t, idx, shift_text):
|
||||||
|
"""Reduces index of a text object if it lies within a spanning
|
||||||
|
cell.
|
||||||
|
|
||||||
|
Parameters
|
||||||
|
----------
|
||||||
|
table : object
|
||||||
|
camelot.table.Table
|
||||||
|
|
||||||
|
idx : list
|
||||||
|
List of tuples of the form (r_idx, c_idx, text).
|
||||||
|
|
||||||
|
shift_text : list
|
||||||
|
{'l', 'r', 't', 'b'}
|
||||||
|
Select one or more from above and pass them as a list to
|
||||||
|
specify where the text in a spanning cell should flow.
|
||||||
|
|
||||||
|
Returns
|
||||||
|
-------
|
||||||
|
indices : list
|
||||||
|
List of tuples of the form (idx, text) where idx is the reduced
|
||||||
|
index of row/column and text is the an lttextline substring.
|
||||||
|
"""
|
||||||
|
indices = []
|
||||||
|
for r_idx, c_idx, text in idx:
|
||||||
|
for d in shift_text:
|
||||||
|
if d == 'l':
|
||||||
|
if t.cells[r_idx][c_idx].spanning_h:
|
||||||
|
while not t.cells[r_idx][c_idx].left:
|
||||||
|
c_idx -= 1
|
||||||
|
if d == 'r':
|
||||||
|
if t.cells[r_idx][c_idx].spanning_h:
|
||||||
|
while not t.cells[r_idx][c_idx].right:
|
||||||
|
c_idx += 1
|
||||||
|
if d == 't':
|
||||||
|
if t.cells[r_idx][c_idx].spanning_v:
|
||||||
|
while not t.cells[r_idx][c_idx].top:
|
||||||
|
r_idx -= 1
|
||||||
|
if d == 'b':
|
||||||
|
if t.cells[r_idx][c_idx].spanning_v:
|
||||||
|
while not t.cells[r_idx][c_idx].bottom:
|
||||||
|
r_idx += 1
|
||||||
|
indices.append((r_idx, c_idx, text))
|
||||||
|
return indices
|
||||||
|
|
||||||
|
|
||||||
|
def _fill_spanning(t, fill=None):
|
||||||
|
"""Fills spanning cells.
|
||||||
|
|
||||||
|
Parameters
|
||||||
|
----------
|
||||||
|
t : object
|
||||||
|
camelot.table.Table
|
||||||
|
|
||||||
|
fill : list
|
||||||
|
{'h', 'v'}
|
||||||
|
Specify to fill spanning cells in horizontal or vertical
|
||||||
|
direction.
|
||||||
|
(optional, default: None)
|
||||||
|
|
||||||
|
Returns
|
||||||
|
-------
|
||||||
|
t : object
|
||||||
|
camelot.table.Table
|
||||||
|
"""
|
||||||
|
for f in fill:
|
||||||
|
if f == "h":
|
||||||
|
for i in range(len(t.cells)):
|
||||||
|
for j in range(len(t.cells[i])):
|
||||||
|
if t.cells[i][j].get_text().strip() == '':
|
||||||
|
if t.cells[i][j].spanning_h and not t.cells[i][j].left:
|
||||||
|
t.cells[i][j].add_text(t.cells[i][j - 1].get_text())
|
||||||
|
elif f == "v":
|
||||||
|
for i in range(len(t.cells)):
|
||||||
|
for j in range(len(t.cells[i])):
|
||||||
|
if t.cells[i][j].get_text().strip() == '':
|
||||||
|
if t.cells[i][j].spanning_v and not t.cells[i][j].top:
|
||||||
|
t.cells[i][j].add_text(t.cells[i - 1][j].get_text())
|
||||||
|
return t
|
||||||
|
|
||||||
|
|
||||||
|
class Lattice:
|
||||||
|
"""Lattice looks for lines in the pdf to form a table.
|
||||||
|
|
||||||
|
If you want to give fill and mtol for each table when specifying
|
||||||
|
multiple table areas, make sure that the length of fill and mtol
|
||||||
|
is equal to the length of table_area. Mapping between them is based
|
||||||
|
on index.
|
||||||
|
|
||||||
|
Parameters
|
||||||
|
----------
|
||||||
|
table_area : list
|
||||||
|
List of strings of the form x1,y1,x2,y2 where
|
||||||
|
(x1, y1) -> left-top and (x2, y2) -> right-bottom in PDFMiner's
|
||||||
|
coordinate space, denoting table areas to analyze.
|
||||||
|
(optional, default: None)
|
||||||
|
|
||||||
|
fill : list
|
||||||
|
List of strings specifying directions to fill spanning cells.
|
||||||
|
{'h', 'v'} to fill spanning cells in horizontal or vertical
|
||||||
|
direction.
|
||||||
|
(optional, default: None)
|
||||||
|
|
||||||
|
mtol : list
|
||||||
|
List of ints specifying m-tolerance parameters.
|
||||||
|
(optional, default: [2])
|
||||||
|
|
||||||
|
jtol : list
|
||||||
|
List of ints specifying j-tolerance parameters.
|
||||||
|
(optional, default: [2])
|
||||||
|
|
||||||
|
blocksize : int
|
||||||
|
Size of a pixel neighborhood that is used to calculate a
|
||||||
|
threshold value for the pixel: 3, 5, 7, and so on.
|
||||||
|
(optional, default: 15)
|
||||||
|
|
||||||
|
threshold_constant : float
|
||||||
|
Constant subtracted from the mean or weighted mean
|
||||||
|
(see the details below). Normally, it is positive but may be
|
||||||
|
zero or negative as well.
|
||||||
|
(optional, default: -2)
|
||||||
|
|
||||||
|
scale : int
|
||||||
|
Used to divide the height/width of a pdf to get a structuring
|
||||||
|
element for image processing.
|
||||||
|
(optional, default: 15)
|
||||||
|
|
||||||
|
iterations : int
|
||||||
|
Number of iterations for dilation.
|
||||||
|
(optional, default: 0)
|
||||||
|
|
||||||
|
invert : bool
|
||||||
|
Whether or not to invert the image. Useful when pdfs have
|
||||||
|
tables with lines in background.
|
||||||
|
(optional, default: False)
|
||||||
|
|
||||||
|
margins : tuple
|
||||||
|
PDFMiner margins. (char_margin, line_margin, word_margin)
|
||||||
|
(optional, default: (1.0, 0.5, 0.1))
|
||||||
|
|
||||||
|
split_text : bool
|
||||||
|
Whether or not to split a text line if it spans across
|
||||||
|
different cells.
|
||||||
|
(optional, default: False)
|
||||||
|
|
||||||
|
flag_size : bool
|
||||||
|
Whether or not to highlight a substring using <s></s>
|
||||||
|
if its size is different from rest of the string, useful for
|
||||||
|
super and subscripts.
|
||||||
|
(optional, default: True)
|
||||||
|
|
||||||
|
shift_text : list
|
||||||
|
{'l', 'r', 't', 'b'}
|
||||||
|
Select one or more from above and pass them as a list to
|
||||||
|
specify where the text in a spanning cell should flow.
|
||||||
|
(optional, default: ['l', 't'])
|
||||||
|
|
||||||
|
debug : string
|
||||||
|
{'contour', 'line', 'joint', 'table'}
|
||||||
|
Set to one of the above values to generate a matplotlib plot
|
||||||
|
of detected contours, lines, joints and the table generated.
|
||||||
|
(optional, default: None)
|
||||||
|
"""
|
||||||
|
def __init__(self, table_area=None, fill=None, mtol=[2], jtol=[2],
|
||||||
|
blocksize=15, threshold_constant=-2, scale=15, iterations=0,
|
||||||
|
invert=False, margins=(1.0, 0.5, 0.1), split_text=False,
|
||||||
|
flag_size=True, shift_text=['l', 't'], debug=None):
|
||||||
|
|
||||||
|
self.method = 'lattice'
|
||||||
|
self.table_area = table_area
|
||||||
|
self.fill = fill
|
||||||
|
self.mtol = mtol
|
||||||
|
self.jtol = jtol
|
||||||
|
self.blocksize = blocksize
|
||||||
|
self.threshold_constant = threshold_constant
|
||||||
|
self.scale = scale
|
||||||
|
self.iterations = iterations
|
||||||
|
self.invert = invert
|
||||||
|
self.char_margin, self.line_margin, self.word_margin = margins
|
||||||
|
self.split_text = split_text
|
||||||
|
self.flag_size = flag_size
|
||||||
|
self.shift_text = shift_text
|
||||||
|
self.debug = debug
|
||||||
|
|
||||||
|
def get_tables(self, pdfname):
|
||||||
|
"""Expects a single page pdf as input with rotation corrected.
|
||||||
|
|
||||||
|
Parameters
|
||||||
|
----------
|
||||||
|
pdfname : string
|
||||||
|
Path to single page pdf file.
|
||||||
|
|
||||||
|
Returns
|
||||||
|
-------
|
||||||
|
page : dict
|
||||||
|
"""
|
||||||
|
layout, dim = get_page_layout(pdfname, char_margin=self.char_margin,
|
||||||
|
line_margin=self.line_margin, word_margin=self.word_margin)
|
||||||
|
lttextlh = get_text_objects(layout, ltype="lh")
|
||||||
|
lttextlv = get_text_objects(layout, ltype="lv")
|
||||||
|
ltchar = get_text_objects(layout, ltype="char")
|
||||||
|
width, height = dim
|
||||||
|
bname, __ = os.path.splitext(pdfname)
|
||||||
|
logger.info('Processing {0}.'.format(os.path.basename(bname)))
|
||||||
|
if not ltchar:
|
||||||
|
warnings.warn("{0}: Page contains no text.".format(
|
||||||
|
os.path.basename(bname)))
|
||||||
|
return {os.path.basename(bname): None}
|
||||||
|
|
||||||
|
imagename = ''.join([bname, '.png'])
|
||||||
|
gs_call = [
|
||||||
|
"-q", "-sDEVICE=png16m", "-o", imagename, "-r600", pdfname
|
||||||
|
]
|
||||||
|
if "ghostscript" in subprocess.check_output(["gs", "-version"]).lower():
|
||||||
|
gs_call.insert(0, "gs")
|
||||||
|
else:
|
||||||
|
gs_call.insert(0, "gsc")
|
||||||
|
subprocess.call(gs_call, stdout=open(os.devnull, 'w'),
|
||||||
|
stderr=subprocess.STDOUT)
|
||||||
|
|
||||||
|
img, threshold = adaptive_threshold(imagename, invert=self.invert,
|
||||||
|
blocksize=self.blocksize, c=self.threshold_constant)
|
||||||
|
pdf_x = width
|
||||||
|
pdf_y = height
|
||||||
|
img_x = img.shape[1]
|
||||||
|
img_y = img.shape[0]
|
||||||
|
sc_x_image = img_x / float(pdf_x)
|
||||||
|
sc_y_image = img_y / float(pdf_y)
|
||||||
|
sc_x_pdf = pdf_x / float(img_x)
|
||||||
|
sc_y_pdf = pdf_y / float(img_y)
|
||||||
|
factors_image = (sc_x_image, sc_y_image, pdf_y)
|
||||||
|
factors_pdf = (sc_x_pdf, sc_y_pdf, img_y)
|
||||||
|
|
||||||
|
vmask, v_segments = find_lines(threshold, direction='vertical',
|
||||||
|
scale=self.scale, iterations=self.iterations)
|
||||||
|
hmask, h_segments = find_lines(threshold, direction='horizontal',
|
||||||
|
scale=self.scale, iterations=self.iterations)
|
||||||
|
|
||||||
|
if self.table_area is not None:
|
||||||
|
areas = []
|
||||||
|
for area in self.table_area:
|
||||||
|
x1, y1, x2, y2 = area.split(",")
|
||||||
|
x1 = float(x1)
|
||||||
|
y1 = float(y1)
|
||||||
|
x2 = float(x2)
|
||||||
|
y2 = float(y2)
|
||||||
|
x1, y1, x2, y2 = scale_to_image((x1, y1, x2, y2), factors_image)
|
||||||
|
areas.append((x1, y1, abs(x2 - x1), abs(y2 - y1)))
|
||||||
|
table_bbox = find_table_joints(areas, vmask, hmask)
|
||||||
|
else:
|
||||||
|
contours = find_table_contours(vmask, hmask)
|
||||||
|
table_bbox = find_table_joints(contours, vmask, hmask)
|
||||||
|
|
||||||
|
if len(self.mtol) == 1 and self.mtol[0] == 2:
|
||||||
|
mtolerance = copy.deepcopy(self.mtol) * len(table_bbox)
|
||||||
|
else:
|
||||||
|
mtolerance = copy.deepcopy(self.mtol)
|
||||||
|
|
||||||
|
if len(self.jtol) == 1 and self.jtol[0] == 2:
|
||||||
|
jtolerance = copy.deepcopy(self.jtol) * len(table_bbox)
|
||||||
|
else:
|
||||||
|
jtolerance = copy.deepcopy(self.jtol)
|
||||||
|
|
||||||
|
if self.debug:
|
||||||
|
self.debug_images = (img, table_bbox)
|
||||||
|
|
||||||
|
table_bbox, v_segments, h_segments = scale_to_pdf(table_bbox, v_segments,
|
||||||
|
h_segments, factors_pdf)
|
||||||
|
|
||||||
|
if self.debug:
|
||||||
|
self.debug_segments = (v_segments, h_segments)
|
||||||
|
self.debug_tables = []
|
||||||
|
|
||||||
|
page = {}
|
||||||
|
tables = {}
|
||||||
|
# sort tables based on y-coord
|
||||||
|
for table_no, k in enumerate(sorted(table_bbox.keys(), key=lambda x: x[1], reverse=True)):
|
||||||
|
# select elements which lie within table_bbox
|
||||||
|
table_data = {}
|
||||||
|
t_bbox = {}
|
||||||
|
v_s, h_s = segments_bbox(k, v_segments, h_segments)
|
||||||
|
t_bbox['horizontal'] = text_in_bbox(k, lttextlh)
|
||||||
|
t_bbox['vertical'] = text_in_bbox(k, lttextlv)
|
||||||
|
char_bbox = text_in_bbox(k, ltchar)
|
||||||
|
table_data['text_p'] = 100 * (1 - (len(char_bbox) / len(ltchar)))
|
||||||
|
for direction in t_bbox:
|
||||||
|
t_bbox[direction].sort(key=lambda x: (-x.y0, x.x0))
|
||||||
|
cols, rows = zip(*table_bbox[k])
|
||||||
|
cols, rows = list(cols), list(rows)
|
||||||
|
cols.extend([k[0], k[2]])
|
||||||
|
rows.extend([k[1], k[3]])
|
||||||
|
# sort horizontal and vertical segments
|
||||||
|
cols = merge_close_values(sorted(cols), mtol=mtolerance[table_no])
|
||||||
|
rows = merge_close_values(
|
||||||
|
sorted(rows, reverse=True), mtol=mtolerance[table_no])
|
||||||
|
# make grid using x and y coord of shortlisted rows and cols
|
||||||
|
cols = [(cols[i], cols[i + 1])
|
||||||
|
for i in range(0, len(cols) - 1)]
|
||||||
|
rows = [(rows[i], rows[i + 1])
|
||||||
|
for i in range(0, len(rows) - 1)]
|
||||||
|
|
||||||
|
table = Table(cols, rows)
|
||||||
|
# set table edges to True using ver+hor lines
|
||||||
|
table = table.set_edges(v_s, h_s, jtol=jtolerance[table_no])
|
||||||
|
nouse = table.nocont_ / (len(v_s) + len(h_s))
|
||||||
|
table_data['line_p'] = 100 * (1 - nouse)
|
||||||
|
# set spanning cells to True
|
||||||
|
table = table.set_spanning()
|
||||||
|
# set table border edges to True
|
||||||
|
table = table.set_border_edges()
|
||||||
|
|
||||||
|
if self.debug:
|
||||||
|
self.debug_tables.append(table)
|
||||||
|
|
||||||
|
assignment_errors = []
|
||||||
|
table_data['split_text'] = []
|
||||||
|
table_data['superscript'] = []
|
||||||
|
for direction in ['vertical', 'horizontal']:
|
||||||
|
for t in t_bbox[direction]:
|
||||||
|
indices, error = get_table_index(
|
||||||
|
table, t, direction, split_text=self.split_text,
|
||||||
|
flag_size=self.flag_size)
|
||||||
|
if indices[:2] != (-1, -1):
|
||||||
|
assignment_errors.append(error)
|
||||||
|
indices = _reduce_index(table, indices, shift_text=self.shift_text)
|
||||||
|
if len(indices) > 1:
|
||||||
|
table_data['split_text'].append(indices)
|
||||||
|
for r_idx, c_idx, text in indices:
|
||||||
|
if all(s in text for s in ['<s>', '</s>']):
|
||||||
|
table_data['superscript'].append((r_idx, c_idx, text))
|
||||||
|
table.cells[r_idx][c_idx].add_text(text)
|
||||||
|
score = get_score([[100, assignment_errors]])
|
||||||
|
table_data['score'] = score
|
||||||
|
|
||||||
|
if self.fill is not None:
|
||||||
|
table = _fill_spanning(table, fill=self.fill)
|
||||||
|
ar = table.get_list()
|
||||||
|
ar = encode_list(ar)
|
||||||
|
table_data['data'] = ar
|
||||||
|
empty_p, r_nempty_cells, c_nempty_cells = count_empty(ar)
|
||||||
|
table_data['empty_p'] = empty_p
|
||||||
|
table_data['r_nempty_cells'] = r_nempty_cells
|
||||||
|
table_data['c_nempty_cells'] = c_nempty_cells
|
||||||
|
table_data['nrows'] = len(ar)
|
||||||
|
table_data['ncols'] = len(ar[0])
|
||||||
|
tables['table-{0}'.format(table_no + 1)] = table_data
|
||||||
|
page[os.path.basename(bname)] = tables
|
||||||
|
|
||||||
|
if self.debug:
|
||||||
|
return None
|
||||||
|
|
||||||
return page
|
return page
|
||||||
Loading…
Reference in New Issue