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+This code is derived from(modified some codes) `paddle_ocr` project: https://github.com/PaddlePaddle/PaddleOCR/tree/release/2.6/deploy/cpp_infer 
+
+## how to install paddle_inference sdk (by downloading tar package from [official web](https://paddleinference.paddlepaddle.org.cn/user_guides/download_lib.html#linux))?
+
+1. Choose the right tar file according to your version of CUDA and GPUs
+2. Put the tar file at anywhere and unzip it
+3. Run `tools/install_paddle_inference.sh`, it will help you to install it automatically, **please modify the root path of paddle_inference at the first line in script**.
+
+> CUDA 11.1 TensorRT8.5 for this repo (tested).
+
+## how to build paddle_ocr?
+
+we can build paddle_ocr separately.
+
+0. set the right library path and include path for PaddlePaddle in `CMakeLists.txt`
+1. `mkdir build && cd build`
+2. `cmake ..`
+3. `make -j8`
+
+all lib files saved to `build/libs`, all samples saved to `build/samples`. please refer to videopipe about how to run samples for paddle_ocr.
+
+## Sample screenshot ##
+### text recognize
+![](../../doc/3rdparty/8.png)