Lichee Pi 4A

OpenCV

应用与综合 系统：revyos 更新：2026-04-21

RuyiSDK 计算机视觉示例

  • 安装依赖包

    sudo apt update
sudo apt install -y git cmake libprotobuf-dev protobuf-compiler libvulkan-dev libopencv-dev

  • 安装 RuyiSDK 根据 RuyiSDK 官方安装指南，在开发板上完成 Ruyi 包管理器本身的安装部署

  • 安装工具链

    ruyi update
ruyi install gnu-plct-xthead

LicheePi 4A OpenCV

  • 示例描述和硬件环境准备

  1. 示例功能：基于 OpenCV 实现图像读取、窗口显示，验证 RuyiGCC 在 LicheePi 4A 上的 OpenCV 编译与运行能力。
  2. 硬件环境：LicheePi 4A 开发板（TH1520 芯片）
  3. 软件环境：Debian/openEuler for RISC-V 系统，已联网可正常访问外部仓库

  • 创建并激活 ruyi 虚拟环境

    # 创建虚拟环境：指定工具链+目标开发板+环境名称
ruyi venv -t gnu-plct-xthead sipeed-lpi4a opencv-env
 
# 激活虚拟环境
source opencv-env/bin/ruyi-activate

  • 使用 ruyi 工具链编译示例代码

    1. 获取 OpenCV 官方源码

      git clone https://github.com/opencv/opencv.git
cd opencv
git checkout 4.9.0

    2. CMake配置与编译

      # 创建独立的编译目录
mkdir build && cd build
 
# CMake配置
cmake -DCMAKE_BUILD_TYPE=Release \
      -DCMAKE_C_COMPILER=riscv64-plctxthead-linux-gnu-gcc \
      -DCMAKE_CXX_COMPILER=riscv64-plctxthead-linux-gnu-g++ \
      -DOPENCV_GENERATE_PKGCONFIG=ON \
      -DCMAKE_INSTALL_PREFIX=./install \
      -DWITH_GTK=ON \
      ..
 
make -j$(nproc)
make install

    3. 环境变量配置

      cd install
export OPENCV_HOME=$(pwd)
 
nano ~/.bashrc

      在文本编辑器中，用方向键滚到文件最末尾，把下面的内容粘贴进bashrc:

      # OpenCV 环境变量配置
export OPENCV_HOME=$HOME/opencv/build/install
 
if [ -d "$OPENCV_HOME/lib64" ]; then
    export PKG_CONFIG_PATH=$OPENCV_HOME/lib64/pkgconfig:$PKG_CONFIG_PATH
    export LD_LIBRARY_PATH=$OPENCV_HOME/lib64:$LD_LIBRARY_PATH
else
    export PKG_CONFIG_PATH=$OPENCV_HOME/lib/pkgconfig:$PKG_CONFIG_PATH
    export LD_LIBRARY_PATH=$OPENCV_HOME/lib:$LD_LIBRARY_PATH
fi

    4. 立即生效并验证

      source ~/.bashrc
pkg-config --modversion opencv4

      输出结果

      «Ruyi opencv-env» debian@revyos-lpi4a:~/opencv/build/installsource ~/.bashrcrc
debian@revyos-lpi4a:~/opencv/build/install$ pkg-config --modversion opencv4
4.14.0

  • 运行测试

    1. 编写代码

      # 进入示例生成目录
cd ~/opencv
 
nano test.cpp

      将以下代码粘贴进nano test.cpp:

      #include <opencv2/imgcodecs.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
#include <iostream>
 
using namespace cv;
using namespace std;
 
int main() {
    // Create a 512x512 white background
    Mat img(512, 512, CV_8UC3, Scalar(255, 255, 255));
 
    // Draw shapes: red filled circle, white rectangle, cyan line
    circle(img, Point(256, 256), 100, Scalar(0, 0, 255), FILLED);
    rectangle(img, Rect(128, 128, 256, 256), Scalar(255, 255, 255), 2);
    line(img, Point(256, 128), Point(256, 256), Scalar(255, 255, 0), 3);
 
    // Draw text
    putText(img, "Hello LicheePi", Point(150, 450),
            FONT_HERSHEY_DUPLEX, 1, Scalar(0, 0, 0), 2);
 
    // Save image
    if (imwrite("test_output.jpg", img)) {
        cout << "Success! Image saved as test_output.jpg" << endl;
    } else {
        cout << "Failed to save image!" << endl;
    }
    return 0;
}

    2. 运行测试程序

      # 编译程序
g++ draw_test.cpp -o draw_test `pkg-config --cflags --libs opencv4`
 
# 运行程序
./test

      输出结果

      Success! Image saved as test_output.jpg

      test.png