Gen2 license plate example

gen2-license-plate-recognition/README.md

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+# Gen2 License Plates Recognition
+
+This example demonstrates how to run 2 stage inference on DepthAI using Gen2 Pipeline Builder.
+First, a license plate is detected on the image and then the cropped license frame is sent to text detection network, 
+which tries to decode the license plates texts
+
+
+> :warning: **This demo is adjusted to detect and recognize chinese license plates**! It may not work with other license plates
+
+## Demo
+
+[![Gen2 License Plates recognition](https://user-images.githubusercontent.com/5244214/111202991-c62f3980-85c4-11eb-8bce-a3c517abeca1.gif)](https://www.youtube.com/watch?v=tB_-mVVNIro "License Plates recognition on DepthAI")
+
+## Pre-requisites
+
+1. Purchase a DepthAI model (see [shop.luxonis.com](https://shop.luxonis.com/))
+2. Install requirements
+   ```
+   python3 -m pip install -r requirements.txt
+   ```
+
+## Usage
+
+```
+usage: main.py [-h] [-nd] [-cam] [-vid VIDEO]
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -nd, --no-debug       Prevent debug output
+  -cam, --camera        Use DepthAI 4K RGB camera for inference (conflicts with -vid)
+  -vid VIDEO, --video VIDEO
+                        Path to video file to be used for inference (conflicts with -cam)
+```
+
+To use with a video file, run the script with the following arguments
+
+```
+python3 main.py -vid ./chineese_traffic.mp4
+```
+
+To use with DepthAI 4K RGB camera, use instead
+
+```
+python3 main.py -cam
+```