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license: apache-2.0
language:
- zh
- en
- ja
library_name: transformers
pipeline_tag: image-text-to-text
tags:
- document-parsing
- ocr
- document-understanding
- vision-language
- multimodal
---
<div align="center">
<h1 align="center">
NaviDC-OCR: Navigating Document Parsing Across Digital and Camera-Captured Documents
</h1>
[](LICENSE)
[](https://arxiv.org/pdf/2608.12898)
[](https://github.com/caipeng328/NaviDC-OCR)
</div>
<div align="center">
<img src="assets/score.png" width="800">
</div>
## Introduction
**Navigating Document Parsing Across Digital and Camera-Captured Documents**
**NaviDC-OCR** is a lightweight (~1.2B parameters), open-source Vision-Language Model designed specifically for document parsing.
Unlike existing methods that mainly target either digital documents or camera-captured documents, NaviDC-OCR unifies both scenarios within a single framework.
Compared with previous document parsing models, NaviDC-OCR introduces
- Multi-node Consensus Voting (MCV) for automatic pseudo-label generation
- Geometry-aware document modeling for camera-captured documents
- Curvature-Guided Douglas-Peucker Sampling (CGDP)
- Image-to-image self-verification for automatic data refinement
- Progressive four-stage training pipeline
- Content-Structure Decoupled Learning for tables and formulas
These techniques enable NaviDC-OCR to achieve state-of-the-art performance on both digital and camera-captured document benchmarks while remaining lightweight enough for practical deployment.
NaviDC-OCR achieves state-of-the-art performance on multiple public document parsing benchmarks.
### [OmniDocBench v1.6](https://github.com/opendatalab/OmniDocBench)
| Model Type | Methods | Param | Overall ↑ | Text Edit ↓ | Formula CDM ↑ | Table TEDS ↑ | Table TEDS-S ↑ | Read Order Edit ↓ |
|---|---|---:|---:|---:|---:|---:|---:|---:|
| **Specialized VLMs** | **NaviDC-OCR** | **1.2B** | **96.87** | <u>0.027</u> | 96.36 | **97.05** | **98.52** | <u>0.122</u> |
| | OvisOCR2 | 0.8B | <u>96.58</u> | **0.025** | **97.53** | <u>94.76</u> | <u>97.16</u> | **0.111** |
| | PaddleOCR-VL-1.6 | 0.9B | 96.33 | 0.033 | <u>97.49</u> | <u>94.76</u> | 97.11 | 0.127 |
| | MinerU2.5-Pro | 1.2B | 95.75 | 0.036 | 97.45 | 93.42 | 95.92 | 0.120 |
| | GLM-OCR | 0.9B | 95.22 | 0.044 | 97.18 | 92.83 | 95.39 | 0.133 |
| | PaddleOCR-VL-1.5 | 0.9B | 94.87 | 0.038 | 96.69 | 91.67 | 94.37 | 0.130 |
| | HunyuanOCR-1.5 | 1B | 94.74 | 0.033 | 97.49 | 94.76 | 97.11 | 0.127 |
| | PaddleOCR-VL | 0.9B | 94.11 | 0.040 | 95.70 | 90.65 | 93.74 | 0.135 |
| | Youtu-Parsing | 2.5B | 93.68 | 0.044 | 93.45 | 92.02 | 95.00 | 0.116 |
| | Logics-Parsing-v2 | 4B | 93.27 | 0.041 | 95.47 | 88.42 | 91.98 | 0.137 |
| | FireRed-OCR | 2B | 93.20 | 0.037 | 95.27 | 88.04 | 91.06 | 0.131 |
| | MinerU2.5 | 1.2B | 92.98 | 0.045 | 95.59 | 87.88 | 91.47 | 0.130 |
| | OpenDoc-0.1B | 0.1B | 90.64 | 0.049 | 92.93 | 83.88 | 87.45 | 0.140 |
| | dots.ocr | 3B | 90.50 | 0.048 | 89.12 | 87.18 | 90.58 | 0.138 |
| | DeepSeek-OCR 2 | 3B | 90.17 | 0.050 | 91.59 | 83.89 | 87.75 | 0.144 |
| | HunyuanOCR | 1B | 89.87 | 0.089 | 87.44 | 91.01 | 93.23 | 0.171 |
| | Dolphin-v2 | 3B | 89.34 | 0.069 | 90.53 | 84.40 | 87.44 | 0.150 |
| | OCRVerse | 4B | 88.44 | 0.063 | 89.14 | 82.44 | 86.27 | 0.163 |
| | MonkeyOCR-pro-3B | 3B | 88.43 | 0.074 | 88.33 | 84.35 | 88.62 | 0.189 |
| **General VLMs** | Ovis2.6-30B-A3B | 30B | 93.62 | 0.035 | 94.93 | 89.44 | 92.40 | 0.135 |
| | Gemini 3 Pro | -- | 92.85 | 0.064 | 95.83 | 89.15 | 92.96 | 0.165 |
| | Gemini 3 Flash | -- | 92.58 | 0.066 | 95.03 | 89.29 | 93.51 | 0.173 |
| | Qwen3-VL-235B | 235B | 89.78 | 0.063 | 92.53 | 83.07 | 86.75 | 0.166 |
| | GPT-5.2 | -- | 86.52 | 0.114 | 88.00 | 82.95 | 87.93 | 0.193 |
| | InternVL3.5-241B | 241B | 83.61 | 0.130 | 89.52 | 74.35 | 79.78 | 0.215 |
### [Wild_OmniDocBench](https://github.com/VirtualLUOUCAS/Wild_OmniDocBench)
| Model Type | Methods | Param | Overall ↑ | Text Edit ↓ | Formula CDM ↑ | Table TEDS ↑ | Table TEDS-S ↑ | Read Order Edit ↓ |
| ------------------- | ----------------- | ----: | -----------: | ----------: | ------------: | -----------: | -------------: | ----------------: |
| **Decoupled VLMs** | **NaviDC-OCR** | 1.2B | **88.53** | **0.1173** | 88.26 | **89.05** | **92.14** | **0.2011** |
| | PaddleOCR-VL-1.6 | 0.9B | 87.36 | 0.1369 | 88.42 | <u>85.76</u> | <u>90.14</u> | 0.2057 |
| | MinerU2.5-Pro | 1.2B | 87.33 | 0.1362 | <u>90.15</u> | 85.46 | 90.12 | <u>0.2013</u> |
| | GLM-OCR | 0.9B | 85.08 | 0.1514 | 89.09 | 81.31 | 85.90 | 0.2228 |
| | PaddleOCR-VL-1.5 | 0.9B | 84.64 | 0.1461 | 86.72 | 81.80 | 86.52 | 0.2138 |
| **End-to-End VLMs** | OvisOCR2 | 0.8B | <u>87.91</u> | 0.129 | **90.37** | 85.13 | 89.11 | 0.2021 |
| | dots.ocr | 3B | 81.84 | 0.1483 | 85.0 | 75.32 | 80.20 | 0.2200 |
| | HunyuanOCR-1.5 | 1B | 77.62 | 0.1979 | 85.12 | 67.54 | 70.67 | 0.2750 |
| | Logics-Parsing-v2 | 4B | 77.10 | 0.4029 | 91.4 | 80.19 | 87.16 | 0.2355 |
### [PureDocBench](https://github.com/zhihengli-casia/puredocbench/)
| Model Type | Model | Clean Overall ↑ | Clean Text ↓ | Clean Formula ↑ | Clean Table ↑ | Digital Degraded Overall ↑ | Digital Degraded Text ↓ | Digital Degraded Formula ↑ | Digital Degraded Table ↑ | Real Degraded Overall ↑ | Real Degraded Text ↓ | Real Degraded Formula ↑ | Real Degraded Table ↑ |
| ------------------ | ----------------- | --------------: | -----------: | --------------: | ------------: | -------------------------: | ----------------------: | -------------------------: | -----------------------: | ----------------------: | -------------------: | ----------------------: | --------------------: |
| **Decoupled VLM** | **NaviDC-OCR** | **86.90** | **0.111** | **81.01** | **91.09** | <u>77.47</u> | 0.206 | **72.59** | 80.45 | **70.85** | <u>0.302</u> | **65.11** | **77.66** |
| | DotsMOCR | 76.27 | 0.151 | 66.23 | 77.65 | 73.16 | <u>0.198</u> | 64.32 | 74.95 | 61.73 | 0.312 | 54.39 | 61.97 |
| | MinerU2.5-Pro | 75.87 | 0.222 | 65.14 | 84.68 | 71.77 | 0.272 | 61.79 | 80.73 | 62.56 | 0.375 | 52.70 | 72.47 |
| | YouTu-Parsing | 75.02 | 0.230 | 67.34 | 80.74 | 69.66 | 0.270 | 61.44 | 74.49 | 60.29 | 0.360 | 52.20 | 64.69 |
| | PaddleOCR-VL-1.5 | 73.01 | 0.266 | 63.53 | 82.12 | 66.73 | 0.339 | 58.03 | 76.07 | 60.50 | 0.398 | 54.00 | 67.33 |
| | GLM-OCR | 68.65 | 0.314 | 57.89 | 79.44 | 63.06 | 0.383 | 53.23 | 74.21 | 58.31 | 0.433 | 50.34 | 67.83 |
| | Dolphin-v2 | 65.90 | 0.342 | 59.80 | 72.12 | 60.24 | 0.393 | 52.20 | 67.86 | 44.92 | 0.553 | 39.98 | 50.04 |
| | MonkeyOCR-pro-3B | 62.23 | 0.346 | 48.46 | 72.83 | 57.40 | 0.397 | 45.57 | 66.32 | 46.49 | 0.511 | 38.18 | 52.43 |
| **End-to-End VLM** | OvisOCR2 | <u>82.14</u> | <u>0.149</u> | <u>71.29</u> | <u>90.12</u> | **77.77** | **0.192** | <u>67.87</u> | **84.71** | 66.61 | 0.316 | 57.64 | <u>73.79</u> |
| | FD-RL | 78.38 | 0.193 | 68.21 | 86.22 | 76.33 | 0.214 | 67.16 | <u>83.22</u> | <u>67.04</u> | **0.298** | 58.82 | 72.08 |
| | Logics-Parsing-v2 | 76.35 | 0.213 | 67.67 | 82.67 | 73.85 | 0.248 | 67.33 | 79.02 | 67.64 | 0.304 | <u>61.65</u> | 71.64 |
| | dots.ocr | 72.01 | 0.248 | 61.37 | 79.51 | 65.95 | 0.307 | 56.67 | 71.86 | 55.68 | 0.403 | 47.70 | 59.63 |
| | Qianfan-OCR | 57.22 | 0.370 | 49.79 | 58.83 | 50.85 | 0.438 | 44.41 | 51.96 | 45.06 | 0.494 | 39.08 | 45.53 |
| **General VLMs** | Qwen3-VL-8B | 72.44 | 0.261 | 65.10 | 78.35 | 72.03 | 0.266 | 64.88 | 77.82 | 62.73 | 0.342 | 55.55 | 66.81 |
| | Kimi K2.6 | 72.32 | 0.303 | 66.93 | 80.30 | 69.95 | 0.322 | 64.69 | 77.31 | 68.02 | 0.335 | 62.44 | 75.14 |
| | Gemini-3.1-Pro | 70.04 | 0.306 | 65.63 | 75.08 | 69.28 | 0.322 | 65.81 | 74.24 | **71.98** | 0.300 | 68.62 | 77.26 |
| | Qwen3.5-397B-A17B | 69.12 | 0.233 | 65.26 | 65.40 | 68.34 | 0.244 | 63.91 | 65.53 | 62.70 | 0.287 | 60.70 | 56.12 |
### [ICDAR2026 Sci-ImageMiner](https://sites.google.com/view/sci-imageminer/)
| # | Team | RMS | TEDS | Weighted |
| ----: | --------------- | --------: | --------: | --------: |
| **1** | **NaviDC-OCR** | **17.23** | **66.39** | **41.81** |
| 2 | VLMinators | 17.29 | 64.31 | 40.80 |
| 3 | Ricoh_SRCB | 16.23 | 61.12 | 38.67 |
| 4 | Vassilis Sioros | 14.94 | 55.20 | 35.07 |
| 5 | DocMiner | 12.67 | 53.72 | 33.19 |
| 6 | Qwen3 VL 8B | 14.08 | 57.86 | 35.97 |
## Installation
```bash
pip install transformers torch pillow
```
## Quick Start
```python
import html
import itertools
import json
import re
from dataclasses import dataclass
from PIL import Image
import torch
from transformers import AutoProcessor, AutoModel
@dataclass
class ContentBlock:
type: str
bbox: list[float]
angle: int | None = None
content: str | None = None
@dataclass
class TableCell:
text: str
start_row_offset_idx: int
end_row_offset_idx: int
start_col_offset_idx: int
end_col_offset_idx: int
row_span: int = 1
col_span: int = 1
OTSL_NL = "<nl>"
OTSL_FCEL = "<fcel>"
OTSL_ECEL = "<ecel>"
OTSL_LCEL = "<lcel>"
OTSL_UCEL = "<ucel>"
OTSL_XCEL = "<xcel>"
OTSL_TOKENS = [OTSL_NL, OTSL_FCEL, OTSL_ECEL, OTSL_LCEL, OTSL_UCEL, OTSL_XCEL]
def _otsl_extract_tokens_and_text(text: str):
pattern = "(" + "|".join(map(re.escape, OTSL_TOKENS)) + ")"
tokens = re.findall(pattern, text)
parts = [part for part in re.split(pattern, text) if part.strip()]
return tokens, parts
def _count_right(rows, row_idx, col_idx, tokens):
span = 0
while col_idx < len(rows[row_idx]) and rows[row_idx][col_idx] in tokens:
span += 1
col_idx += 1
return span
def _count_down(rows, row_idx, col_idx, tokens):
span = 0
while row_idx < len(rows) and col_idx < len(rows[row_idx]) and rows[row_idx][col_idx] in tokens:
span += 1
row_idx += 1
return span
def _otsl_parse_texts(parts, tokens):
rows = [list(row) for is_nl, row in itertools.groupby(tokens, lambda token: token == OTSL_NL) if not is_nl]
if not rows:
return [], []
max_cols = max(len(row) for row in rows)
for row in rows:
row.extend([OTSL_ECEL] * (max_cols - len(row)))
cells = []
row_idx = 0
col_idx = 0
for idx, part in enumerate(parts):
if part in (OTSL_FCEL, OTSL_ECEL):
cell_text = ""
right_offset = 1
if part != OTSL_ECEL and idx + 1 < len(parts) and parts[idx + 1] not in OTSL_TOKENS:
cell_text = parts[idx + 1].strip()
right_offset = 2
next_right = parts[idx + right_offset] if idx + right_offset < len(parts) else ""
next_bottom = rows[row_idx + 1][col_idx] if row_idx + 1 < len(rows) and col_idx < len(rows[row_idx + 1]) else ""
col_span = 1 + (_count_right(rows, row_idx, col_idx + 1, {OTSL_LCEL, OTSL_XCEL}) if next_right in {OTSL_LCEL, OTSL_XCEL} else 0)
row_span = 1 + (_count_down(rows, row_idx + 1, col_idx, {OTSL_UCEL, OTSL_XCEL}) if next_bottom in {OTSL_UCEL, OTSL_XCEL} else 0)
cells.append(TableCell(
text=cell_text,
row_span=row_span,
col_span=col_span,
start_row_offset_idx=row_idx,
end_row_offset_idx=row_idx + row_span,
start_col_offset_idx=col_idx,
end_col_offset_idx=col_idx + col_span,
))
if part in (OTSL_FCEL, OTSL_ECEL, OTSL_LCEL, OTSL_UCEL, OTSL_XCEL):
col_idx += 1
elif part == OTSL_NL:
row_idx += 1
col_idx = 0
return cells, rows
def convert_otsl_to_html(otsl_content: str) -> str:
if otsl_content.startswith("<table") and otsl_content.endswith("</table>"):
return otsl_content
tokens, parts = _otsl_extract_tokens_and_text(otsl_content)
cells, rows = _otsl_parse_texts(parts, tokens)
if not cells or not rows:
return ""
grid = [[None for _ in range(len(rows[0]))] for _ in range(len(rows))]
for cell in cells:
for row_idx in range(cell.start_row_offset_idx, min(cell.end_row_offset_idx, len(rows))):
for col_idx in range(cell.start_col_offset_idx, min(cell.end_col_offset_idx, len(rows[0]))):
grid[row_idx][col_idx] = cell
html_rows = []
for row_idx, row in enumerate(grid):
html_rows.append("<tr>")
for col_idx, cell in enumerate(row):
if cell is None or cell.start_row_offset_idx != row_idx or cell.start_col_offset_idx != col_idx:
continue
attrs = ""
if cell.row_span > 1:
attrs += f' rowspan="{cell.row_span}"'
if cell.col_span > 1:
attrs += f' colspan="{cell.col_span}"'
html_rows.append(f"<td{attrs}>{html.escape(cell.text.strip())}</td>")
html_rows.append("</tr>")
return "<table>" + "".join(html_rows) + "</table>"
def post_process(blocks: list[ContentBlock]) -> list[ContentBlock]:
for block in blocks:
if block.type == "table" and block.content:
block.content = convert_otsl_to_html(block.content)
elif block.type == "equation" and block.content:
content = block.content.strip()
content = content.removeprefix("\\[").removesuffix("\\]").strip()
if not (content.startswith("$") and content.endswith("$")):
content = f"$${content}$$"
block.content = content
return [block for block in blocks if block.type != "equation_block"]
def infer(image: Image.Image, prompt: str) -> str:
messages = [
{"role": "system", "content": "You are a helpful assistant."},
{"role": "user", "content": [
{"type": "image"},
{"type": "text", "text": prompt},
]},
]
chat_prompt = processor.apply_chat_template(
messages,
tokenize=False,
add_generation_prompt=True,
)
inputs = processor(
text=[chat_prompt],
images=[image.convert("RGB")],
padding=True,
return_tensors="pt",
).to(device=model.device, dtype=model.dtype)
output_ids = model.generate(
**inputs,
use_cache=True,
max_new_tokens=4096,
do_sample=False,
)
output_ids = output_ids.cpu().tolist()[0][len(inputs.input_ids[0]):]
return processor.batch_decode(
[output_ids],
skip_special_tokens=True,
clean_up_tokenization_spaces=False,
)[0].strip()
processor = AutoProcessor.from_pretrained("StarDoc-AI/NaviDC-OCR", trust_remote_code=True, use_fast=True)
model = AutoModel.from_pretrained(
"StarDoc-AI/NaviDC-OCR",
trust_remote_code=True,
torch_dtype=torch.bfloat16,
).cuda().eval()
# text
image=Image.open("./assets/text.png").convert("RGB")
raw_text = infer(image, "Please output the text content from the image.")
print(raw_text.strip())
# table
image=Image.open("./assets/table.png").convert("RGB")
raw_otsl = infer(image, "This is the image of a table. Please output the table in OTSL format.")
print(convert_otsl_to_html(raw_otsl))
# formula
image=Image.open("./assets/formula.png").convert("RGB")
raw_formula = infer(image, "Please write out the expression of the formula in the image using LaTeX format.")
formula_block = ContentBlock("equation", [0.0, 0.0, 1.0, 1.0], content=raw_formula)
formula = post_process([formula_block])[0].content
print(formula)
#code
image=Image.open("./assets/code.png").convert("RGB")
raw_code = infer(image,"The image contains a code snippet, please output the parsing result.")
print(raw_code.strip())
# layout
image=Image.open("./assets/layout.jpg").convert("RGB")
image = image.resize((1036, 1036), Image.Resampling.BICUBIC)
raw_layout = infer(image, "Analyze the image layout.")
print(raw_layout.strip())
# Distorted document layout
layout_image = Image.open("./assets/layout_distorted.jpg").convert("RGB")
layout_image = layout_image.resize((1036, 1036), Image.Resampling.BICUBIC)
raw_layout = infer(layout_image, "\nMulti-point Layout Segmentation Analysis.")
print(raw_layout.strip())
#scientific figure
image=Image.open("./assets/scientific_figure.png").convert("RGB")
raw_scientific_figure = infer(image, "This is a scientific figure. Please extract the table implied by this figure.")
print(convert_otsl_to_html(raw_scientific_figure))
```
If you would like to perform complete document parsing, please refer to our GitHub repository: https://github.com/caipeng328/NaviDC-OCR.
## Citation
```bibtex
@article{navidc_ocr,
title={NaviDC-OCR: Navigating Document Parsing Across Digital and Camera-Captured Documents},
author={Cai, Peng and Zou, Zhaofan and Liu, Shifa and Wang, Yikun and Tang, Jiawei and Yang, Kaicheng and Tong, Meng and He, Zhongjiang and Sun, Hao},
journal={arXiv preprint arXiv:2608.12898},
year={2026}
}
```
## Acknowledgements
NaviDC-OCR is built upon
- MinerU
- Qwen2.5-VL
- Qwen3
- Transformers
- PyTorch
- FlashAttention
We sincerely thank these excellent open-source projects.
---
## Contact
If you have any questions, feel free to open an issue or contact us. |