如何从 PDF 文件中提取文本和文本坐标? [英] How to extract text and text coordinates from a PDF file?
问题描述
我想使用 PDFMiner 从 PDF 文件中提取所有文本框和文本框坐标.
I want to extract all the text boxes and text box coordinates from a PDF file with PDFMiner.
许多其他 Stack Overflow 帖子介绍了如何以有序的方式提取所有文本，但我如何执行获取文本和文本位置的中间步骤?
Many other Stack Overflow posts address how to extract all text in an ordered fashion, but how can I do the intermediate step of getting the text and text locations?
给定一个 PDF 文件，输出应该类似于:
Given a PDF file, output should look something like:
489, 41, "Signature"
500, 52, "b"
630, 202, "a_g_i_r"
推荐答案
完全公开，我是pdfminer.six.它是用于 python 3 的 pdfminer 社区维护版本.
Full disclosure, I am one of the maintainers of pdfminer.six. It is a community-maintained version of pdfminer for python 3.
如今，pdfminer.six 有多个 API 可以从 PDF 中提取文本和信息.对于以编程方式提取信息，我建议使用 extract_pages().这允许您检查页面上的所有元素，按照布局算法创建的有意义的层次结构进行排序.
Nowadays, pdfminer.six has multiple API's to extract text and information from a PDF. For programmatically extracting information I would advice to use extract_pages(). This allows you to inspect all of the elements on a page, ordered in a meaningful hierarchy created by the layout algorithm.
以下示例是显示层次结构中所有元素的 Pythonic 方式.它使用示例目录中的 simple1.pdfpdfminer.six.
The following example is a pythonic way of showing all the elements in the hierachy. It uses the simple1.pdf from the samples directory of pdfminer.six.
from pathlib import Path
from typing import Iterable, Any
from pdfminer.high_level import extract_pages
def show_ltitem_hierarchy(o: Any, depth=0):
"""Show location and text of LTItem and all its descendants"""
if depth == 0:
print('element x1 y1 x2 y2 text')
print('------------------------------ --- --- --- ---- -----')
print(
f'{get_indented_name(o, depth):<30.30s} '
f'{get_optional_bbox(o)} '
f'{get_optional_text(o)}'
)
if isinstance(o, Iterable):
for i in o:
show_ltitem_hierarchy(i, depth=depth + 1)
def get_indented_name(o: Any, depth: int) -> str:
"""Indented name of LTItem"""
return ' ' * depth + o.__class__.__name__
def get_optional_bbox(o: Any) -> str:
"""Bounding box of LTItem if available, otherwise empty string"""
if hasattr(o, 'bbox'):
return ''.join(f'{i:<4.0f}' for i in o.bbox)
return ''
def get_optional_text(o: Any) -> str:
"""Text of LTItem if available, otherwise empty string"""
if hasattr(o, 'get_text'):
return o.get_text().strip()
return ''
path = Path('~/Downloads/simple1.pdf').expanduser()
pages = extract_pages(path)
show_ltitem_hierarchy(pages)
输出显示层次结构中的不同元素.每个的边界框.以及该元素包含的文本.
The output shows the different elements in the hierarchy. The bounding box for each. And the text that this element contains.
element x1 y1 x2 y2 text
------------------------------ --- --- --- ---- -----
generator
LTPage 0 0 612 792
LTTextBoxHorizontal 100 695 161 719 Hello
LTTextLineHorizontal 100 695 161 719 Hello
LTChar 100 695 117 719 H
LTChar 117 695 131 719 e
LTChar 131 695 136 719 l
LTChar 136 695 141 719 l
LTChar 141 695 155 719 o
LTChar 155 695 161 719
LTAnno
LTTextBoxHorizontal 261 695 324 719 World
LTTextLineHorizontal 261 695 324 719 World
LTChar 261 695 284 719 W
LTChar 284 695 297 719 o
LTChar 297 695 305 719 r
LTChar 305 695 311 719 l
LTChar 311 695 324 719 d
LTAnno
LTTextBoxHorizontal 100 595 161 619 Hello
LTTextLineHorizontal 100 595 161 619 Hello
LTChar 100 595 117 619 H
LTChar 117 595 131 619 e
LTChar 131 595 136 619 l
LTChar 136 595 141 619 l
LTChar 141 595 155 619 o
LTChar 155 595 161 619
LTAnno
LTTextBoxHorizontal 261 595 324 619 World
LTTextLineHorizontal 261 595 324 619 World
LTChar 261 595 284 619 W
LTChar 284 595 297 619 o
LTChar 297 595 305 619 r
LTChar 305 595 311 619 l
LTChar 311 595 324 619 d
LTAnno
LTTextBoxHorizontal 100 495 211 519 H e l l o
LTTextLineHorizontal 100 495 211 519 H e l l o
LTChar 100 495 117 519 H
LTAnno
LTChar 127 495 141 519 e
LTAnno
LTChar 151 495 156 519 l
LTAnno
LTChar 166 495 171 519 l
LTAnno
LTChar 181 495 195 519 o
LTAnno
LTChar 205 495 211 519
LTAnno
LTTextBoxHorizontal 321 495 424 519 W o r l d
LTTextLineHorizontal 321 495 424 519 W o r l d
LTChar 321 495 344 519 W
LTAnno
LTChar 354 495 367 519 o
LTAnno
LTChar 377 495 385 519 r
LTAnno
LTChar 395 495 401 519 l
LTAnno
LTChar 411 495 424 519 d
LTAnno
LTTextBoxHorizontal 100 395 211 419 H e l l o
LTTextLineHorizontal 100 395 211 419 H e l l o
LTChar 100 395 117 419 H
LTAnno
LTChar 127 395 141 419 e
LTAnno
LTChar 151 395 156 419 l
LTAnno
LTChar 166 395 171 419 l
LTAnno
LTChar 181 395 195 419 o
LTAnno
LTChar 205 395 211 419
LTAnno
LTTextBoxHorizontal 321 395 424 419 W o r l d
LTTextLineHorizontal 321 395 424 419 W o r l d
LTChar 321 395 344 419 W
LTAnno
LTChar 354 395 367 419 o
LTAnno
LTChar 377 395 385 419 r
LTAnno
LTChar 395 395 401 419 l
LTAnno
LTChar 410 395 424 419 d
LTAnno
(Similar answer here, here and here , I'll try to keep them in sync.)
这篇关于如何从 PDF 文件中提取文本和文本坐标?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
