共计 2305 个字符,预计需要花费 6 分钟才能阅读完成。
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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