OnnxOCR

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A high-performance multilingual OCR project based on ONNXRuntime

English | 简体中文

Version Updates

• 2026.05.01

  1. Added ONNX license plate detection and recognition.
  2. Added RapidTable-based ONNX table recognition.
  3. Added RapidLayout-based Chinese and English layout analysis.
  4. Added RapidDoc-based document layout analysis and Markdown export.
  5. Added /plate, /table, /layout, /layout_markdown, and related HTTP endpoints.

• 2025.05.21

  1. Added PP-OCRv5 models, supporting Simplified Chinese, Traditional Chinese, Chinese Pinyin, English, and Japanese in one model.
  2. Improved overall recognition accuracy compared with PP-OCRv4.
  3. Recognition accuracy is consistent with PaddleOCR 3.0.

Core Advantages

1. Deep learning framework free: a general OCR project ready for deployment.
2. Cross-architecture support: PaddleOCR-converted ONNX models can run on ARM and x86 devices.
3. Unified inference engine: all ONNX models create ONNXRuntime sessions through onnxocr/inference_engine.py.
4. Multilingual support: one model supports 5 text types.
5. Source-level integration: rapid_layout, rapid_table, and rapid_doc live under the onnxocr/ package, with no dependency on rapidocr==3.4.3 or rapid-orientation.
6. Hardware adaptation friendly: downstream vendors can adapt GPU/NPU providers by modifying the unified inference engine.

Environment Setup

python>=3.8
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple -r requirements.txt

Notes:

• The Mobile model is used by default.
• Mobile models are already stored in onnxocr/models/ppocrv5.
• Larger PP-OCRv5 Server ONNX models can be downloaded separately and used to replace det/rec models under onnxocr/models/ppocrv5/.

One-Click Run

python test_ocr.py

Feature-specific tests:

python tests/test_general_ocr.py
python tests/test_license_plate_ocr.py
python tests/test_table_ocr.py
python tests/test_layout_analysis.py
python tests/test_layout_markdown.py

Generated files are written to result_img/, which is ignored by git.

General OCR

import cv2
from onnxocr.onnx_paddleocr import ONNXPaddleOcr

img = cv2.imread("onnxocr/test_images/715873facf064583b44ef28295126fa7.jpg")
model = ONNXPaddleOcr(use_angle_cls=True, use_gpu=False)
result = model.ocr(img)
print(result)

License Plate Recognition

License plate recognition is integrated into ONNXPaddleOcr as an optional mode. Existing general OCR usage is unchanged.

from onnxocr.onnx_paddleocr import ONNXPaddleOcr, sav2PlateImg

plate_model = ONNXPaddleOcr(
    use_angle_cls=True,
    use_gpu=False,
    use_plate_recognition=True,
    plate_min_score=0.4,
)
plate_result = plate_model.ocr(img)
sav2PlateImg(img, plate_result, name="./result_img/test_plate_vis.jpg")

Model files:

onnxocr/models/license_plate/car_plate_detect.onnx
onnxocr/models/license_plate/plate_rec.onnx

Table Recognition

Table recognition is integrated from RapidTable. It reuses general OCR detection/recognition results, restores table structure, and outputs HTML, cell boxes, and logical row/column coordinates.

from onnxocr.onnx_paddleocr import ONNXPaddleOcr, sav2TableImg

table_model = ONNXPaddleOcr(
    use_angle_cls=True,
    use_gpu=False,
    use_table_recognition=True,
    table_model_type="slanet_plus",
)
table_result = table_model.ocr(img)
print(table_result["html"])
sav2TableImg(img, table_result, name="./result_img/test_table_vis.jpg")

Model files:

onnxocr/models/table/slanet-plus.onnx
onnxocr/models/table/ch_ppstructure_mobile_v2_SLANet.onnx
onnxocr/models/table/en_ppstructure_mobile_v2_SLANet.onnx

Chinese / English Layout Analysis

Layout analysis is integrated from RapidLayout. It locates document elements such as titles, text blocks, tables, figures, headers, and footers.

from onnxocr.onnx_paddleocr import ONNXPaddleOcr, sav2LayoutImg

layout_model = ONNXPaddleOcr(
    use_gpu=False,
    use_layout_analysis=True,
    layout_model_type="pp_layout_cdla",
)
layout_result = layout_model.ocr(img)
sav2LayoutImg(img, layout_result, name="./result_img/test_layout_vis.jpg")

For English layout analysis, set layout_model_type to pp_layout_publaynet.

Model files:

onnxocr/models/layout/layout_cdla.onnx
onnxocr/models/layout/layout_publaynet.onnx

Document To Markdown

Document-to-Markdown export is integrated from RapidDoc. It analyzes titles, paragraphs, tables, figures, and other layout elements, then saves the result as a Markdown file.

from onnxocr.layout_markdown import LayoutMarkdownConverter

converter = LayoutMarkdownConverter(
    layout_model_type="pp_doclayoutv2",
    formula_enable=False,
    table_enable=True,
)
result = converter.convert_file(
    "onnxocr/test_images/layout_cdla.jpg",
    output_md_path="./result_img/test_layout_markdown.md",
)
print(result["markdown_path"])

RapidDoc model files:

onnxocr/models/rapid_doc/layout/pp_doclayoutv2.onnx
onnxocr/models/rapid_doc/table/q_cls.onnx
onnxocr/models/rapid_doc/table/unet.onnx
onnxocr/models/rapid_doc/table/slanet-plus.onnx

Inference Engine Adaptation

General OCR, license plate recognition, table recognition, layout analysis, and RapidDoc document parsing all create ONNXRuntime sessions through onnxocr/inference_engine.py.

To adapt a downstream GPU/NPU provider, start from:

from onnxocr.inference_engine import create_session

Main extension points:

• create_session(model_path, providers=None, use_gpu=False, gpu_id=0, sess_options=None)
• build_providers(use_gpu=False, gpu_id=0, providers=None)
• build_providers_from_engine_cfg(engine_cfg)
• ProviderConfig(engine_cfg)

Only onnxocr/inference_engine.py imports onnxruntime directly. Feature modules do not call ONNXRuntime APIs directly.

API Service

Start service:

python app-service.py

Main endpoints:

• /ocr: general OCR.
• /plate: license plate recognition.
• /table: table recognition.
• /layout: layout analysis.
• /layout_markdown: image/PDF to Markdown.

WebUI:

python webui.py

Docker Image

docker build -t ocr-service .
docker run -itd --name onnxocr-service -p 5006:5005 ocr-service

Project Layout

onnxocr/
  inference_engine.py        # single ONNXRuntime entry
  onnx_paddleocr.py          # public user API
  predict_det.py             # general OCR detection
  predict_rec.py             # general OCR recognition
  orientation.py             # local RapidOrientation ONNX adapter
  license_plate.py           # license plate OCR
  table_recognition.py       # table recognition wrapper
  layout_recognition.py      # layout analysis wrapper
  layout_markdown.py         # RapidDoc Markdown wrapper
  rapid_layout/              # source-level RapidLayout ONNX integration
  rapid_table/               # source-level RapidTable ONNX integration
  rapid_doc/                 # source-level RapidDoc ONNX integration
  models/                    # local ONNX models
tests/                       # feature-specific tests

Effect Demonstration

Example 1	Example 2

Example 3	Example 4

Contact & Communication

OnnxOCR Community

Acknowledgments

Thanks to PaddleOCR for technical support and model references.

Thanks to the RapidAI open-source community, including RapidTable, RapidLayout, RapidDoc, and RapidOrientation, for excellent models, code, and engineering references.

Open Source & Donations

If you recognize this project, you can support it via Alipay or WeChat Pay.

Star History

Contribution Guidelines

Issues and Pull Requests are welcome.