MinerU/next_docs/en/user_guide/tutorial/output_file_description.rst

Output File Description
=========================

After executing the ``magic-pdf`` command, in addition to outputting
files related to markdown, several other files unrelated to markdown
will also be generated. These files will be introduced one by one.

some_pdf_layout.pdf
~~~~~~~~~~~~~~~~~~~

Each page layout consists of one or more boxes. The number at the top
left of each box indicates its sequence number. Additionally, in
``layout.pdf``, different content blocks are highlighted with different
background colors.

.. figure:: ../../_static/image/layout_example.png
   :alt: layout example

   layout example

some_pdf_spans.pdf
~~~~~~~~~~~~~~~~~~

All spans on the page are drawn with different colored line frames
according to the span type. This file can be used for quality control,
allowing for quick identification of issues such as missing text or
unrecognized inline formulas.

.. figure:: ../../_static/image/spans_example.png
   :alt: spans example

   spans example

some_pdf_model.json
~~~~~~~~~~~~~~~~~~~

Structure Definition
^^^^^^^^^^^^^^^^^^^^

.. code:: python

   from pydantic import BaseModel, Field
   from enum import IntEnum

   class CategoryType(IntEnum):
        title = 0               # Title
        plain_text = 1          # Text
        abandon = 2             # Includes headers, footers, page numbers, and page annotations
        figure = 3              # Image
        figure_caption = 4      # Image description
        table = 5               # Table
        table_caption = 6       # Table description
        table_footnote = 7      # Table footnote
        isolate_formula = 8     # Block formula
        formula_caption = 9     # Formula label

        embedding = 13          # Inline formula
        isolated = 14           # Block formula
        text = 15               # OCR recognition result


   class PageInfo(BaseModel):
       page_no: int = Field(description="Page number, the first page is 0", ge=0)
       height: int = Field(description="Page height", gt=0)
       width: int = Field(description="Page width", ge=0)

   class ObjectInferenceResult(BaseModel):
       category_id: CategoryType = Field(description="Category", ge=0)
       poly: list[float] = Field(description="Quadrilateral coordinates, representing the coordinates of the top-left, top-right, bottom-right, and bottom-left points respectively")
       score: float = Field(description="Confidence of the inference result")
       latex: str | None = Field(description="LaTeX parsing result", default=None)
       html: str | None = Field(description="HTML parsing result", default=None)

   class PageInferenceResults(BaseModel):
        layout_dets: list[ObjectInferenceResult] = Field(description="Page recognition results", ge=0)
        page_info: PageInfo = Field(description="Page metadata")


   # The inference results of all pages, ordered by page number, are stored in a list as the inference results of MinerU
   inference_result: list[PageInferenceResults] = []

The format of the poly coordinates is [x0, y0, x1, y1, x2, y2, x3, y3],
representing the coordinates of the top-left, top-right, bottom-right,
and bottom-left points respectively. |Poly Coordinate Diagram|

example
^^^^^^^

.. code:: json

   [
       {
           "layout_dets": [
               {
                   "category_id": 2,
                   "poly": [
                       99.1906967163086,
                       100.3119125366211,
                       730.3707885742188,
                       100.3119125366211,
                       730.3707885742188,
                       245.81326293945312,
                       99.1906967163086,
                       245.81326293945312
                   ],
                   "score": 0.9999997615814209
               }
           ],
           "page_info": {
               "page_no": 0,
               "height": 2339,
               "width": 1654
           }
       },
       {
           "layout_dets": [
               {
                   "category_id": 5,
                   "poly": [
                       99.13092803955078,
                       2210.680419921875,
                       497.3183898925781,
                       2210.680419921875,
                       497.3183898925781,
                       2264.78076171875,
                       99.13092803955078,
                       2264.78076171875
                   ],
                   "score": 0.9999997019767761
               }
           ],
           "page_info": {
               "page_no": 1,
               "height": 2339,
               "width": 1654
           }
       }
   ]

some_pdf_middle.json
~~~~~~~~~~~~~~~~~~~~

+----------------+--------------------------------------------------------------+
| Field Name     | Description                                                  |
|                |                                                              |
+================+==============================================================+
| pdf_info       | list, each element is a dict representing the parsing result |
|                | of each PDF page, see the table below for details            |
+----------------+--------------------------------------------------------------+
| \_             | ocr \| txt, used to indicate the mode used in this           |
| parse_type     | intermediate parsing state                                   |
|                |                                                              |
+----------------+--------------------------------------------------------------+
| \_version_name | string, indicates the version of magic-pdf used in this      |
|                | parsing                                                      |
|                |                                                              |
+----------------+--------------------------------------------------------------+

**pdf_info**

Field structure description

+-------------------------+------------------------------------------------------------+
| Field                   | Description                                                |
| Name                    |                                                            |
+=========================+============================================================+
| preproc_blocks          | Intermediate result after PDF preprocessing, not yet       |
|                         | segmented                                                  |
+-------------------------+------------------------------------------------------------+
| layout_bboxes           | Layout segmentation results, containing layout direction   |
|                         | (vertical, horizontal), and bbox, sorted by reading order  |
+-------------------------+------------------------------------------------------------+
| page_idx                | Page number, starting from 0                               |
|                         |                                                            |
+-------------------------+------------------------------------------------------------+
| page_size               | Page width and height                                      |
|                         |                                                            |
+-------------------------+------------------------------------------------------------+
| \_layout_tree           | Layout tree structure                                      |
|                         |                                                            |
+-------------------------+------------------------------------------------------------+
| images                  | list, each element is a dict representing an img_block     |
+-------------------------+------------------------------------------------------------+
| tables                  | list, each element is a dict representing a table_block    |
+-------------------------+------------------------------------------------------------+
| interline_equation      | list, each element is a dict representing an               |
|                         | interline_equation_block                                   |
|                         |                                                            |
+-------------------------+------------------------------------------------------------+
| discarded_blocks        | List, block information returned by the model that needs   |
|                         | to be dropped                                              |
|                         |                                                            |
+-------------------------+------------------------------------------------------------+
| para_blocks             | Result after segmenting preproc_blocks                     |
|                         |                                                            |
+-------------------------+------------------------------------------------------------+

In the above table, ``para_blocks`` is an array of dicts, each dict
representing a block structure. A block can support up to one level of
nesting.

**block**

The outer block is referred to as a first-level block, and the fields in
the first-level block include:

+------------------------+-------------------------------------------------------------+
| Field                  | Description                                                 |
| Name                   |                                                             |
+========================+=============================================================+
| type                   | Block type (table|image)                                    |
+------------------------+-------------------------------------------------------------+
| bbox                   | Block bounding box coordinates                              |
+------------------------+-------------------------------------------------------------+
| blocks                 | list, each element is a dict representing a second-level    |
|                        | block                                                       |
+------------------------+-------------------------------------------------------------+

There are only two types of first-level blocks: “table” and “image”. All
other blocks are second-level blocks.

The fields in a second-level block include:

+----------------------+----------------------------------------------------------------+
| Field                | Description                                                    |
| Name                 |                                                                |
+======================+================================================================+
|                      | Block type                                                     |
| type                 |                                                                |
+----------------------+----------------------------------------------------------------+
|                      | Block bounding box coordinates                                 |
| bbox                 |                                                                |
+----------------------+----------------------------------------------------------------+
|                      | list, each element is a dict representing a line, used to      |
| lines                | describe the composition of a line of information              |
+----------------------+----------------------------------------------------------------+

Detailed explanation of second-level block types

================== ======================
type               Description
================== ======================
image_body         Main body of the image
image_caption      Image description text
table_body         Main body of the table
table_caption      Table description text
table_footnote     Table footnote
text               Text block
title              Title block
interline_equation Block formula
================== ======================

**line**

The field format of a line is as follows:

+---------------------+----------------------------------------------------------------+
| Field               | Description                                                    |
| Name                |                                                                |
+=====================+================================================================+
|                     | Bounding box coordinates of the line                           |
| bbox                |                                                                |
+---------------------+----------------------------------------------------------------+
| spans               | list, each element is a dict representing a span, used to      |
|                     | describe the composition of the smallest unit                  |
+---------------------+----------------------------------------------------------------+

**span**

+---------------------+-----------------------------------------------------------+
| Field               | Description                                               |
| Name                |                                                           |
+=====================+===========================================================+
| bbox                | Bounding box coordinates of the span                      |
+---------------------+-----------------------------------------------------------+
| type                | Type of the span                                          |
+---------------------+-----------------------------------------------------------+
| content             | Text spans use content, chart spans use img_path to store |
| \|                  | the actual text or screenshot path information            |
| img_path            |                                                           |
+---------------------+-----------------------------------------------------------+

The types of spans are as follows:

================== ==============
type               Description
================== ==============
image              Image
table              Table
text               Text
inline_equation    Inline formula
interline_equation Block formula
================== ==============

**Summary**

A span is the smallest storage unit for all elements.

The elements stored within para_blocks are block information.

The block structure is as follows:

First-level block (if any) -> Second-level block -> Line -> Span

.. _example-1:

example
^^^^^^^

.. code:: json

   {
       "pdf_info": [
           {
               "preproc_blocks": [
                   {
                       "type": "text",
                       "bbox": [
                           52,
                           61.956024169921875,
                           294,
                           82.99800872802734
                       ],
                       "lines": [
                           {
                               "bbox": [
                                   52,
                                   61.956024169921875,
                                   294,
                                   72.0000228881836
                               ],
                               "spans": [
                                   {
                                       "bbox": [
                                           54.0,
                                           61.956024169921875,
                                           296.2261657714844,
                                           72.0000228881836
                                       ],
                                       "content": "dependent on the service headway and the reliability of the departure ",
                                       "type": "text",
                                       "score": 1.0
                                   }
                               ]
                           }
                       ]
                   }
               ],
               "layout_bboxes": [
                   {
                       "layout_bbox": [
                           52,
                           61,
                           294,
                           731
                       ],
                       "layout_label": "V",
                       "sub_layout": []
                   }
               ],
               "page_idx": 0,
               "page_size": [
                   612.0,
                   792.0
               ],
               "_layout_tree": [],
               "images": [],
               "tables": [],
               "interline_equations": [],
               "discarded_blocks": [],
               "para_blocks": [
                   {
                       "type": "text",
                       "bbox": [
                           52,
                           61.956024169921875,
                           294,
                           82.99800872802734
                       ],
                       "lines": [
                           {
                               "bbox": [
                                   52,
                                   61.956024169921875,
                                   294,
                                   72.0000228881836
                               ],
                               "spans": [
                                   {
                                       "bbox": [
                                           54.0,
                                           61.956024169921875,
                                           296.2261657714844,
                                           72.0000228881836
                                       ],
                                       "content": "dependent on the service headway and the reliability of the departure ",
                                       "type": "text",
                                       "score": 1.0
                                   }
                               ]
                           }
                       ]
                   }
               ]
           }
       ],
       "_parse_type": "txt",
       "_version_name": "0.6.1"
   }

.. |Poly Coordinate Diagram| image:: ../../_static/image/poly.png