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PDF table & paragraph extractor

Project description

DePDF

An ultimate pdf file disintegration tool. DePDF is designed to extract tables and paragraphs into structured markup language [eg. html] from embedding pdf pages. You can also use it to convert page/pdf to html.

Built on top of pdfplumber

Table of Contents

[toc]

Installation

pip install depdf

Example

from depdf import DePDF
from depdf import DePage

# general
with DePDF.load('test/test.pdf') as pdf
    pdf_html = pdf.to_html
    print(pdf_html)

# with dedicated configurations
c = Config(
    debug_flag=True,
    verbose_flag=True,
    add_line_flag=True
)
pdf = DePDF.load('test/test.pdf', config=c)
page_index = 23  # start from zero
page = pdf_file.pages[page_index]
page_soup = page.soup
print(page_soup.text)

APIs

functions usage
extract_page_paragraphs extract paragraphs from specific page
extract_page_tables extract tables from specific page
convert_pdf_to_html convert the entire pdf to html
convert_page_to_html convert specific page to html

In-Depth

In-page elements

  • Paragraph
    • Text
    • Span
  • Table
    • Cell
  • Image

Common properties

property & method explanation
html converted html string
soup converted beautiful soup
bbox bounding box region
save_html write html tag to local file

DePDF HTML structure

<div class="{pdf_class}">
    %for <!--page-{pid}-->
        <div id="page-{pid}" class="{page_class}">
            %for {in_page_elements} endfor%
        </div>
    endfor%
</div>

DePage HTML element structure

Paragraph

<p>
    {text-content}
    <span> {span-content} </span>
    ... 
</p>

Table

<table>
    <tr>
        <td> {cell_0_0} </td>
        <td> {cell_0_1} </td>
        ...
    </tr>
    <tr colspan=2>
        <td> {merged_cell_1_0} </td>
        ...
    </tr>
    ...
</table>

Image

<img src="temp_depdf/$prefix.png"></img>

Configuration encyclopedia

PDF 解析

keyword detail default
logo_flag 是否分析不同页面共有的水印信息 True
header_footer_flag 是否分析不同页面共有的页眉页脚信息 True
temp_dir_prefix 是否分析不同页面共有的页眉页脚信息 temp_depdf
unique_prefix 生成临时文件图片的文件名称(一般会自动生成)

页面解析

keyword detail default
table_flag 是否解析表格 True
paragraph_flag 是否解析段落 True
image_flag 是否解析图片 True
resolution debug 模式下生成页面预览图的分辨率 300
main_frame_tolerance 识别页面内主要文字区域的阈值
x_tolerance 识别页面内文本行的横向阈值
y_tolerance 识别页面内文本行的纵向阈值
page_num_top_fraction 识别页面内页码信息上边界距离和页面的高度比例
page_num_left_fraction 识别页面内页码信息
page_num_right_fraction 识别页面内页码信息

页面分栏识别

keyword detail default
multiple_columns_flag 是否识别多栏页面 True
max_columns 识别多栏页面栏数上限 3
column_region_half_width 识别多栏页面栏分界宽度
min_column_region_objects 识别多栏页面栏分界内的对象数目上限

字符提取

keyword detail default
char_overlap_size 判断字符是否重叠的阈值
default_char_size 默认的字符大小
char_size_upper 探测到字符大小的上限
char_size_lower 探测到字符大小的下限

表格提取

keyword detail default
dotted_line_flag 是否分析页面内的虚线
curved_line_flag 是否分析页面内的曲线
snap_flag 是否合并表格线段
add_line_flag 是否为表格增加横竖线
min_double_line_tolerance 判断线段是否为临近双线的距离下限
max_double_line_tolerance 判断线段是否为临近双线的距离上限
vertical_double_line_tolerance 判断线段是否为垂直临近双线的距离上限
table_cell_merge_tolerance 合并单元格的宽度差别容错值
skip_empty_table 是否忽略空白表格
add_vertical_lines_flag 是否增加竖线
add_horizontal_lines_flag 是否增加横线
add_horizontal_line_tolerance 增加横线的阈值

图片提取

keyword detail default
min_image_size 识别图片的边长最小像素值 80
image_resolution 提取图片的分辨率 300

页眉页脚识别

keyword detail default
default_head_tail_page_offset_percent 页眉页脚的错位比例

日志输出

keyword detail default
log_level 日志的级别 WARNING
verbose_flag 是否输出运行中间过程信息 False
debug_flag 是否打开调试(生成解析对象的边界信息) False

生成的网页标签

keyword detail default
span_class 生成 HTML 的 span 节点的 class pdf-span
paragraph_class 生成 HTML 的 p 节点的 class pdf-paragraph
table_class 生成 HTML 的 table 节点的 class pdf-table
pdf_class 生成 HTML 的最外层 pdf div 节点的 class pdf-content
image_class 生成 HTML 的 img 节点的 class pdf-image
page_class 生成 HTML 的 page div 的 class pdf-page
mini_page_class 生成 HTML 的 mini-page div 的 class pdf-mini-page

Update log

  • 2020-03-18 add support for multiple-column PDFs
  • 2020-03-12 initial depdf realease

Appendix

todo

  • [x] add support for multiple-column pdf page
  • [x] better table structure recognition
  • [x] recognize embedded objects inside page elements

DePage element denotations

Useful element properties within page

page element

Project details


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