基本环境

（1）安装WSL；

（2）安装cmake：

sh
wget https://github.com/Kitware/CMake/releases/download/v3.20.0/cmake-3.20.0-linux-x86_64.tar.gz
tar -xzvf cmake-3.20.0-linux-x86_64.tar.gz
sudo ln -sf $(pwd)/cmake-3.20.0-linux-x86_64/bin/* /usr/bin/

(3)安装gcc++：

sh
# 如果 Ubuntu 版本 < 18.04，需要加入仓库
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc
sudo apt-get install g++

（4）安装GDB：

sh
sudo apt install gdb

（5）clion建立空工程后选择toolchains如下：

Ubuntu安装Opencv

从源码安装opencv-4.x

依赖：

sh
sudo apt install build-essential cmake git pkg-config libgtk-3-dev \
    libavcodec-dev libavformat-dev libswscale-dev libv4l-dev \
    libxvidcore-dev libx264-dev libjpeg-dev libpng-dev libtiff-dev \
    gfortran openexr libatlas-base-dev python3-dev python3-numpy \
    libtbb2 libtbb-dev libdc1394-22-dev libopenexr-dev \
    libgstreamer-plugins-base1.0-dev libgstreamer1.0-dev

去github下载最新包：https://github.com/opencv/opencv.git

或者去官网下载 一个版本：https://opencv.org/releases/

sh
cd opencv-4.x
mkdir -p build && cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE ..
make -j8
sudo make install 

从源码安装opencv-3.x

方法同opencv-4.x，但安装路径有区别，得注意。

直接pkg包安装

不想编译也ok，直接：

sh
sudo apt-get install -y libopencv-dev

freetype支持

https://cloud.tencent.com/developer/article/1353734

CLion工程cmake文件写法

c
# 声明要求的 cmake 最低版本
cmake_minimum_required( VERSION 3.8 )
# 声明一个 cmake 工程
project( cpptest )
# 设置编译模式
set( CMAKE_BUILD_TYPE "Debug"  )
#set(OpenCV_DIR "/usr/local/share/OpenCV")
set(OpenCV_DIR "/usr/local/share/opencv4") # 给一个安装路径
find_package( OpenCV REQUIRED ) # 找包
#添加OpenCV头文件
include_directories(${OpenCV_INCLUDE_DIRS})
message(STATUS "OpenCV_INCLUDE_DIRS: ${OpenCV_INCLUDE_DIRS}")
message(STATUS "OpenCV_LIBS: ${OpenCV_LIBS}")
# 添加一个可执行程序
# 语法：add_executable( 程序名 源代码文件 ）
add_executable( cpptest main.cpp)
# 将库文件链接到可执行程序上
target_link_libraries( cpptest  ${OpenCV_LIBS})

Opencv demo

c++
#include <iostream>
#include<opencv2/opencv.hpp>//opencv简单程序标配头文件
using namespace cv;//使用cv命名空间
int main()
{
    Mat src=imread("/mnt/c/Users/kevin/Desktop/img.png");//读取图片，要提前将图片放在程序路径下
    imwrite("/mnt/c/Users/kevin/Desktop/img2.jpg",src);//保存结果图片
    return 0;
}

MNN

mnn文档

https://mnn-docs.readthedocs.io/en/latest/compile/engine.html

在Ubuntu编译MNN

sh
sudo apt install protobuf-compiler
# 下载mnn源码后：
cd schema && ./generate.sh
mkdir -p build && cd build
cmake  -DMNN_BUILD_CONVERTER=ON -DCMAKE_BUILD_TYPE=Release ..
make -j8
sudo make install

安装成功：

sh
[100%] Built target OnnxClip
Install the project...
-- Install configuration: "Release"
-- Installing: /usr/local/include/MNN/MNNDefine.h
-- Installing: /usr/local/include/MNN/Interpreter.hpp
-- Installing: /usr/local/include/MNN/HalideRuntime.h
-- Installing: /usr/local/include/MNN/Tensor.hpp
-- Installing: /usr/local/include/MNN/ErrorCode.hpp
-- Installing: /usr/local/include/MNN/ImageProcess.hpp
-- Installing: /usr/local/include/MNN/Matrix.h
-- Installing: /usr/local/include/MNN/Rect.h
-- Installing: /usr/local/include/MNN/MNNForwardType.h
-- Installing: /usr/local/include/MNN/AutoTime.hpp
-- Installing: /usr/local/include/MNN/MNNSharedContext.h
-- Installing: /usr/local/include/MNN/expr/Expr.hpp
-- Installing: /usr/local/include/MNN/expr/ExprCreator.hpp
-- Installing: /usr/local/include/MNN/expr/MathOp.hpp
-- Installing: /usr/local/include/MNN/expr/NeuralNetWorkOp.hpp
-- Installing: /usr/local/include/MNN/expr/Optimizer.hpp
-- Installing: /usr/local/include/MNN/expr/Executor.hpp
-- Installing: /usr/local/include/MNN/expr/Module.hpp
-- Up-to-date: /usr/local/include/MNN/expr/NeuralNetWorkOp.hpp
-- Installing: /usr/local/include/MNN/expr/ExecutorScope.hpp
-- Installing: /usr/local/include/MNN/expr/Scope.hpp
-- Installing: /usr/local/lib/libMNN.so
-- Installing: /usr/local/lib/libMNN_Express.so
-- Set runtime path of "/usr/local/lib/libMNN_Express.so" to ""

CLion中使用

CmakeList.txt:

c
# 声明要求的 cmake 最低版本
cmake_minimum_required( VERSION 3.8 )
# 声明一个 cmake 工程
project( cpptest )
# 设置编译模式
set( CMAKE_BUILD_TYPE "Debug"  )
set(OpenCV_DIR "/usr/local/share/opencv4") # 给一个安装路径
find_package( OpenCV REQUIRED ) # 找包
if (OpenCV_FOUND)
    # If the package has been found, several variables will
    # be set, you can find the full list with descriptions
    # in the OpenCVConfig.cmake file.
    # Print some message showing some of them
    message(STATUS "OpenCV library status:")
    message(STATUS "    version: ${OpenCV_VERSION}")
    message(STATUS "    include path: ${OpenCV_INCLUDE_DIRS}")
else ()
    message(FATAL_ERROR "Could not locate OpenCV")
endif()
#添加OpenCV头文件
include_directories(${OpenCV_INCLUDE_DIRS})
set(lib_DIR /usr/local/lib)
include_directories(/usr/local/include)
add_library(MNN SHARED IMPORTED)
set_target_properties(
        MNN
        PROPERTIES IMPORTED_LOCATION
        ${lib_DIR}/libMNN.so
)
#include 是头文件 src是c代码
include_directories( ${CMAKE_SOURCE_DIR}/include )
message(STATUS "CMAKE_SOURCE_DIR : ${CMAKE_SOURCE_DIR}")
aux_source_directory( ${CMAKE_SOURCE_DIR}/src DIR_SRCS)
message(STATUS "DIR_SRCS: ${DIR_SRCS}")
# 添加一个可执行程序
add_executable( cpptest main.cpp ${DIR_SRCS})
# 将库文件链接到可执行程序上
target_link_libraries( cpptest MNN ${OpenCV_LIBS} )

main.cpp:

cpp
#include <iostream>
#include <string>
#include <MNN/Interpreter.hpp>
#include <opencv2/opencv.hpp>
#include <iostream>
#include "Yolo.h"
using namespace MNN;
int main() {
    const char *model_name = "/mnt/d/cpp_ptoject/cpptest/checkpoints/yolov7-tiny416.mnn";
    std::shared_ptr<Interpreter> net(Interpreter::createFromFile(model_name));
    ScheduleConfig config;
    config.type = MNN_FORWARD_AUTO;
    Session *pSession = net->createSession(config);
    Tensor *ptensorInput = net->getSessionInput(pSession, NULL);
    std::vector<int> vctInputDims = ptensorInput->shape();
    printf("输入Tensor的维度为： ");
    for (size_t i = 0; i < vctInputDims.size(); ++i) {
        printf("%d ", vctInputDims[i]);
    }
    printf("\n");
    // opencv 读取数据，resize操作，减均值， 除方差，并且转成nchw
    cv::Mat matImg = cv::imread("/mnt/d/cpp_ptoject/cpptest/doc/bus.jpg", cv::IMREAD_COLOR);
    assert(matImg.data != NULL);
    cv::Mat matFloatImage;
    int MODEL_INPUT_HEIGHT = 416;
    int MODEL_INPUT_WIDTH = 416;
    float r;
    int dw, dh;
    letterbox(matImg,
              matFloatImage,
              MODEL_INPUT_WIDTH,
              MODEL_INPUT_HEIGHT,
              cv::Scalar(114, 114, 114),
              false,
              true,
              32, r, dw, dh);
    cv::cvtColor(matFloatImage, matFloatImage, cv::COLOR_BGR2RGB);
    matFloatImage.convertTo(matFloatImage, CV_32FC3);
    cv::Mat matStd(MODEL_INPUT_HEIGHT, MODEL_INPUT_WIDTH, CV_32FC3, cv::Scalar(255.0f, 255.0f, 255.0f));
    cv::Mat matMean(MODEL_INPUT_HEIGHT, MODEL_INPUT_WIDTH, CV_32FC3, cv::Scalar(0.0f, 0.0f, 0.0f)); // 均值
    cv::Mat matNormImage = (matFloatImage - matMean) / matStd;
    std::vector<std::vector<cv::Mat>> nChannels;
    std::vector<cv::Mat> rgbChannels(3);
    cv::split(matNormImage, rgbChannels);
    nChannels.push_back(rgbChannels); //  NHWC  转NCHW
    void *pvData = malloc(1 * 3 * MODEL_INPUT_HEIGHT * MODEL_INPUT_WIDTH * sizeof(float));
    int nPlaneSize = MODEL_INPUT_HEIGHT * MODEL_INPUT_WIDTH;
    for (int c = 0; c < 3; ++c) {
        cv::Mat matPlane = nChannels[0][c];
        memcpy((float *) (pvData) + c * nPlaneSize, \
             matPlane.data, nPlaneSize * sizeof(float));
    }
    // 将数据拷贝到Tensor中
    auto nchwTensor = new Tensor(ptensorInput, Tensor::CAFFE);
    ::memcpy(nchwTensor->host<float>(), pvData, nPlaneSize * 3 * sizeof(float));
    ptensorInput->copyFromHostTensor(nchwTensor);
    delete nchwTensor;
    // 获取输出Tensor
    Tensor *pTensorOutput = net->getSessionOutput(pSession, NULL);
    // 执行推理
    net->runSession(pSession);
    // 获取输出维度类型
    auto dimType = pTensorOutput->getDimensionType();
    if (pTensorOutput->getType().code != halide_type_float) {
        dimType = Tensor::CAFFE;
    }
    // 创建输出tensor
    std::shared_ptr<Tensor> outputUser(new Tensor(pTensorOutput, dimType));
    MNN_PRINT("output size:%d\n", outputUser->elementSize());
    // 拷贝出去
    pTensorOutput->copyToHostTensor(outputUser.get());
    auto type = outputUser->getType();
    auto size = outputUser->elementSize();
    //100行*7列
    std::vector<std::vector<float>> tempValues;
    if (type.code == halide_type_float) {
        auto values = outputUser->host<float>();
        for (int i = 0; i < size; i += 7) {
            std::vector<float> temp;
            if (values[i + 6] < 0.1) {
                break;
            }
            for (int j = 0; j < 7; j++) {
                temp.push_back(values[i + j]);
            }
            tempValues.push_back(temp);
        }
    }
    drawResultImage(matImg, tempValues, r, dw, dh);
    cv::imwrite("/mnt/d/cpp_ptoject/cpptest/doc/bus_out.jpg", matImg);
    // 释放我们创建的数据内存,这个不是tensor里的
    if (NULL != pvData) {
        free(pvData);
        pvData = NULL;
    }
    std::cout << "finish " << std::endl;
    return 0;
}

项目样子：