PDFminer: extract text with its font information

问题

I find this question, but it uses command line, and I do not want to call a Python script in command line using subprocess and parse HTML files to get the font information.

I want to use PDFminer as a library, and I find this question, but they are just all about extracting plain texts, without other information such as font name, font size, and so on.

回答1:

#!/usr/bin/env python
from pdfminer.pdfparser import PDFParser
from pdfminer.pdfdocument import PDFDocument
from pdfminer.pdfpage import PDFPage
from pdfminer.pdfinterp import PDFResourceManager
from pdfminer.pdfinterp import PDFPageInterpreter
from pdfminer.layout import LAParams
from pdfminer.converter import PDFPageAggregator
import pdfminer


def createPDFDoc(fpath):
    fp = open(fpath, 'rb')
    parser = PDFParser(fp)
    document = PDFDocument(parser, password='')
    # Check if the document allows text extraction. If not, abort.
    if not document.is_extractable:
        raise "Not extractable"
    else:
        return document


def createDeviceInterpreter():
    rsrcmgr = PDFResourceManager()
    laparams = LAParams()
    device = PDFPageAggregator(rsrcmgr, laparams=laparams)
    interpreter = PDFPageInterpreter(rsrcmgr, device)
    return device, interpreter


def parse_obj(objs):
    for obj in objs:
        if isinstance(obj, pdfminer.layout.LTTextBox):
            for o in obj._objs:
                if isinstance(o,pdfminer.layout.LTTextLine):
                    text=o.get_text()
                    if text.strip():
                        for c in  o._objs:
                            if isinstance(c, pdfminer.layout.LTChar):
                                print "fontname %s"%c.fontname
        # if it's a container, recurse
        elif isinstance(obj, pdfminer.layout.LTFigure):
            parse_obj(obj._objs)
        else:
            pass


document=createPDFDoc("/tmp/simple.pdf")
device,interpreter=createDeviceInterpreter()
pages=PDFPage.create_pages(document)
interpreter.process_page(pages.next())
layout = device.get_result()


parse_obj(layout._objs)

回答2:

This approach does not use PDFMiner but does the trick.

First, convert the PDF document into docx. Using python-docx you can then retrieve font information. Here's an example of getting all the bold text

from docx import *

document = Document('/path/to/file.docx')

for para in document.paragraphs:
    for run in para.runs:
        if run.bold:
            print run.text

If you really want to use PDFMiner you can try this. Passing '-t' would convert the PDF into HTML with all the font information.

回答3:

Have a look at PDFlib, it can extract font info as you require and has a Python library you can import in your scripts and work with it.

回答4:

Some informations are in lower level, in the LTChar class. It seems logic because font size, italic, bold, etc, can be applied to a single character.

More infos here : https://github.com/euske/pdfminer/blob/master/pdfminer/layout.py#L222

But I'm still confuse about font color not in this class

来源：https://stackoverflow.com/questions/34606382/pdfminer-extract-text-with-its-font-information

标签

python

text-extraction

pdfminer