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Fix legacy documentation in CRNN #247

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Mar 26, 2024
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Fix legacy documentation in CRNN #247

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14 changes: 5 additions & 9 deletions models/text_recognition_crnn/README.md
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# CRNN

An End-to-End Trainable Neural Network for Image-based Sequence Recognition and Its Application to Scene Text Recognition
[An End-to-End Trainable Neural Network for Image-based Sequence Recognition and Its Application to Scene Text Recognition](https://arxiv.org/abs/1507.05717)

Results of accuracy evaluation with [tools/eval](../../tools/eval) at different text recognition datasets.

Expand All @@ -21,20 +21,16 @@ Note:
- `text_recognition_CRNN_EN_2021sep.onnx`: https://docs.opencv.org/4.5.2/d9/d1e/tutorial_dnn_OCR.html (CRNN_VGG_BiLSTM_CTC.onnx)
- `text_recognition_CRNN_CH_2021sep.onnx`: https://docs.opencv.org/4.x/d4/d43/tutorial_dnn_text_spotting.html (crnn_cs.onnx)
- `text_recognition_CRNN_CN_2021nov.onnx`: https://docs.opencv.org/4.5.2/d4/d43/tutorial_dnn_text_spotting.html (crnn_cs_CN.onnx)
- `text_recognition_CRNN_EN_2021sep.onnx` can detect digits (0\~9) and letters (return lowercase letters a\~z) (view `charset_36_EN.txt` for details).
- `text_recognition_CRNN_CH_2021sep.onnx` can detect digits (0\~9), upper/lower-case letters (a\~z and A\~Z), and some special characters (view `charset_94_CH.txt` for details).
- `text_recognition_CRNN_CN_2021nov.onnx` can detect digits (0\~9), upper/lower-case letters (a\~z and A\~Z), some Chinese characters and some special characters (view `charset_3944_CN.txt` for details).
- `text_recognition_CRNN_EN_2021sep.onnx` can detect digits (0\~9) and letters (return lowercase letters a\~z) (see `CHARSET_EN_36` for details in `crnn.py`).
- `text_recognition_CRNN_CH_2021sep.onnx` can detect digits (0\~9), upper/lower-case letters (a\~z and A\~Z), and some special characters (see `CHARSET_CH_94` for details in `crnn.py`).
- `text_recognition_CRNN_CN_2021nov.onnx` can detect digits (0\~9), upper/lower-case letters (a\~z and A\~Z), some Chinese characters and some special characters (see `CHARSET_CN_3944` for details in `crnn.py`).
- For details on training this model series, please visit https://github.com/zihaomu/deep-text-recognition-benchmark.

## Demo

***NOTE***:

- This demo uses [text_detection_db](../text_detection_db) as text detector.
- Selected model must match with the charset:
- Try `text_recognition_CRNN_EN_2021sep.onnx` with `charset_36_EN.txt`.
- Try `text_recognition_CRNN_CH_2021sep.onnx` with `charset_94_CH.txt`
- Try `text_recognition_CRNN_CN_2021sep.onnx` with `charset_3944_CN.txt`.

### Python

Expand Down Expand Up @@ -85,7 +81,7 @@ Run the demo detecting Chinese:

# get help regarding various parameters
./build/opencv_zoo_text_recognition_crnn --help

```

### Examples

Expand Down