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关于python:用-Python-提取-PDF-文本的简单方法

第一步,装置工具库
1、tika — 用于从各种文件格式中进行文档类型检测和内容提取
2、wand — 基于 ctypes 的简略 ImageMagick 绑定
3、pytesseract — OCR 辨认工具
创立一个虚拟环境,装置这些工具

python -m venv venv
source venv/bin/activate
pip install tika wand pytesseract

第二步,编写代码
如果 pdf 文件外面既有文字,又有图片,以下代码能够间接辨认文字:

import io
import pytesseract
import sys

from PIL import Image
from tika import parser
from wand.image import Image as wi

text_raw = parser.from_file("example.pdf")
print(text_raw['content'].strip())

这还不够,咱们还须要能失败图片的局部:

def extract_text_image(from_file, lang='deu', image_type='jpeg', resolution=300):
    print("-- Parsing image", from_file, "--")
    print("---------------------------------")
    pdf_file = wi(filename=from_file, resolution=resolution)
    image = pdf_file.convert(image_type)
    image_blobs = []
    for img in image.sequence:
        img_page = wi(image=img)
        image_blobs.append(img_page.make_blob(image_type))
    extract = []
    for img_blob in image_blobs:
        image = Image.open(io.BytesIO(img_blob))
        text = pytesseract.image_to_string(image, lang=lang)
        extract.append(text)
    for item in extract:
        for line in item.split("\n"):
            print(line)

合并一下,残缺代码如下:

import io
import sys

from PIL import Image
import pytesseract
from wand.image import Image as wi
from tika import parser


def extract_text_image(from_file, lang='deu', image_type='jpeg', resolution=300):
    print("-- Parsing image", from_file, "--")
    print("---------------------------------")
    pdf_file = wi(filename=from_file, resolution=resolution)
    image = pdf_file.convert(image_type)
    for img in image.sequence:
        img_page = wi(image=img)
        image = Image.open(io.BytesIO(img_page.make_blob(image_type)))
        text = pytesseract.image_to_string(image, lang=lang)
        for part in text.split("\n"):
            print("{}".format(part))


def parse_text(from_file):
    print("-- Parsing text", from_file, "--")
    text_raw = parser.from_file(from_file)
    print("---------------------------------")
    print(text_raw['content'].strip())
    print("---------------------------------")


if __name__ == '__main__':
    parse_text(sys.argv[1])
    extract_text_image(sys.argv[1], sys.argv[2])

第三步,执行
如果 example.pdf 是这样的:
在命令行这样执行:

python run.py example.pdf deu | xargs -0 echo > extract.txt

最终 extract.txt 的后果如下:

-- Parsing text example.pdf --
---------------------------------
Title pure text

Content pure text



  


    Slide 1
    Slide 2
---------------------------------
-- Parsing image example.pdf --
---------------------------------
Title pure text

Content pure text

Title in image

Text in image

你可能会问,如果是简体中文,那个 lang 参数传递什么,传 ‘chi_sim’,其实是有官网阐明的,链接如下:

https://github.com/tesseract-…

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