~~tag> VIM3 OpenCV~~

====== OpenCV DNN Usage ======

<WRAP important >
For [[:VIM3]] only, not for [[:VIM3L]].
</WRAP>

===== Install Dependencies =====

Before installing the OpenCV package, you need to install the dependencies.

```shell
sudo apt update
sudo apt install python3 python3-dev python3-numpy cmake libgtk2.0-dev
```

===== Install OpenCV =====

Get the OpenCV package and install it.

```shell
wget https://dl.khadas.com/development/opencv_4.8.1.deb
sudo dpkg -i opencv_4.8.1.deb
```

===== Run Test =====

==== Get demo source ====

Get the example repository from [[kg>OpenCV_NPU_Demo]].

```shell
cd ~
git clone https://github.com/khadas/OpenCV_NPU_Demo.git
```

==== Compile ====

Compile with cmake tool.

```shell
cd ~/OpenCV_NPU_Demo/cpp_demo
mkdir build && cd build
cmake ..
make
```

==== Run ====

After the operation is successful, you can see that the camera has captured the face.

```shell
cd ~/OpenCV_NPU_Demo/cpp_demo/build
./detect-camera 1 ../../model/yunet_int8.onnx
```

<WRAP tip >
For example my cam device node is ''/dev/video1'', 2nd argument must be ''1''
</WRAP>

{{products:sbc:vim3:npu:opencv-c.jpeg}}

===== Quantize Model =====

We suggest that quantize your model before running on VIM3. If your model performs bad after quantizing, without quantification is okay. Get [[https://github.com/opencv/opencv_zoo/tree/main/tools/quantize|quantized model]]