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README
Apache-2.0

tr - Text Recognition

一款针对扫描文档的离线文本识别SDK,核心代码全部采用C++开发,并提供Python接口

编译环境: Ubuntu 16.04


让CRNN支持多行文本的识别 CRNN For Text With Multiple Lines :star:

将CRNN与Transformer Encoder/Decoder相结合,从而使CRNN支持多行文本的识别。标注时不再需要标注文本行的边界框,大大降低标注和开发人员的工作量。适用于弯曲文本等场景。
如果您要识别的图片类似于以下图片,使用现有OCR无法解决时,那么可以试一试多行CRNN。


抢鲜体验: crnn_for_text_with_multiple_lines

Let's Continue,多行CRNN适用于Image Recognition任务吗?

如果我们把图像中的物体看成是一个个字符,那么图像识别任务不就是文字识别任务吗?

为了回答这个问题,我在PASCAL VOC数据集上进行了初步的验证,结论是多行CRNN模型不仅可以识别物体的类别,还可以识别物体的个数。不过由于Transformer强大的记忆力,在训练集上比较容易过拟合,需要进行数据增强并提高训练样本数量。
抢鲜体验: crnn_for_image_recognition

接下来让我们挑战一个难倒国内外无数大语言模型的任务

最近大语言模型真的好火,如何将CRNN技术应用到LLM呢?首先需要对多行CRNN进行改造以支持文本输入,只需将卷积特征提取层替换成nn.Embedding即可,为了方便区分,对改造后的模型简称为ChatCRNN。

目前行业内发布的大模型对多位数整数乘法表现较差,有很多研究机构在研究如何解决。通过实验我发现3位整数乘法对ChatCRNN而言还算比较容易学习的,单卡训练半小时内可达到99.99%以上精度。
更多技术细节可以参考我的知乎回答

以前我们经常需要单独训练一个语言模型来对OCR识别结果进行纠错,往后没必要那么麻烦了,因为加入多层TransformerEncoder后模型已经具备了语言模型的能力。

抢鲜体验: ChatCRNN


带Transformer的CRNN

https://github.com/myhub/tr/tree/master/v2.8

  • 采用当前流行的YOLO系列主干网络
  • 加入轻量级Transformer Encoder结构提升模型根据上下文纠错的能力
  • 降低对真实样本的依赖,训练集仅仅包含100多个真实样本

Install 安装:

pip install tr==2.8.2 -i https://pypi.tuna.tsinghua.edu.cn/simple
说明: 不同版本的精度有差异,新版本精度不一定更高
旧版本安装:
+ pip install tr==2.8.1

Windows 64位系统安装:
pip install tr==2.8.6 -i https://pypi.org/simple/

Example 代码示例:

import tr
crnn = tr.CRNN()                                # 初始化文本行识别网络
chars, scores = crnn.run("imgs/line.png")       # 识别文本行
print("".join(chars))                           # 打印结果

GUI 截图识别

# 需要安装PyQt5,PIL依赖
python -m tr.gui

更新说明

  • c++接口支持
  • 添加python2支持
  • 去除opencv-python、Pillow依赖,降低部署难度
  • 支持多线程

Requirements

  • python2/python3,需要安装numpy
  • 不支持Windows、CentOS 6、ARM

GPU版本安装说明

由于新型号的显卡需要更高版本的CUDA,GPU版本暂时只支持旧型号的显卡。
如果对速度有要求,推荐安装GPU版本
要使用GPU版本,复制tr_gpu文件夹里面的文件到tr文件夹
注意: 需要先安装CUDA 10.1以及cuDNN 7.6.5。

若不想安装CUDA/cuDNN,可以使用docker部署

docker pull mcr.microsoft.com/azureml/onnxruntime:v1.3.0-cuda10.1-cudnn7
sudo nvidia-docker run -v /path/to/tr:/path/to/tr --rm -it mcr.microsoft.com/azureml/onnxruntime:v1.3.0-cuda10.1-cudnn7

Install

  • 安装方法一
git clone https://github.com/myhub/tr.git
cd ./tr
sudo python setup.py install
  • 安装方法二
sudo pip install git+https://github.com/myhub/tr.git@master

Test

python2 demo.py               # python2兼容测试
python3 test.py               # 可视化测试
python3 test-multi-thread.py  # 多线程测试
python3 test_crnn_pyqt5.py    # 截图识别

关联项目

  • 若需要Web端调用,推荐参考TrWebOCR

Python Example

import tr

# detect text lines, return list of (cx, cy, width, height, angle)
print(tr.detect("imgs/web.png", tr.FLAG_RECT))

# detect text lines with angle, return list of (cx, cy, width, height, angle)
print(tr.detect("imgs/id_card.jpeg", tr.FLAG_ROTATED_RECT))

# recognize text line, return (text, confidence)
print(tr.recognize("imgs/line.png"))

# detect and recognize text lines with angle, return list of ((cx, cy, width, height, angle), text, confidence)
print(tr.run("imgs/id_card.jpeg"))

C++ Example

tr_init(0, 0, "crnn.bin", NULL);

#define MAX_WIDTH		512
int unicode[MAX_WIDTH];
float prob[MAX_WIDTH]; 

auto ws = tr_recognize(0, (void *)"line.png", 0, 0, 0, unicode, prob, MAX_WIDTH);

tr_release(0);

效果展示


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简介

Free Offline OCR 离线的中文文本检测+识别SDK 展开 收起
Python
Apache-2.0
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