OpenCV扫描图像三种方式练习

约定不等于承诺〃 2023-07-14 10:50 5阅读 0赞

QT += core
    QT -= gui
    
    CONFIG += c++11
    
    TARGET = myOpencvTest1
    CONFIG += console
    CONFIG -= app_bundle
    
    TEMPLATE = app
    
    SOURCES += main.cpp
    
    INCLUDEPATH += C:\OpenCv4.0\include  \
                   C:\OpenCv4.0\include\opencv2
    
    CONFIG(debug, debug|release): {
    LIBS += C:\OpenCv4.0\x64\vc14\lib\opencv_world400d.lib
    #LIBS += -LC:\OpenCv4.0\x64\vc14\lib \
    #        -lopencv_world400d
    } else:CONFIG(release, debug|release): {
    LIBS += C:\OpenCv4.0\x64\vc14\lib\opencv_world400.lib
    #LIBS += -LC:\OpenCv4.0\x64\vc14\lib \
    #        -lopencv_world400
    }
    
    
    # The following define makes your compiler emit warnings if you use
    # any feature of Qt which as been marked deprecated (the exact warnings
    # depend on your compiler). Please consult the documentation of the
    # deprecated API in order to know how to port your code away from it.
    DEFINES += QT_DEPRECATED_WARNINGS
    
    # You can also make your code fail to compile if you use deprecated APIs.
    # In order to do so, uncomment the following line.
    # You can also select to disable deprecated APIs only up to a certain version of Qt.
    #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

#include <QCoreApplication>
    #include <iostream>
    #include <opencv2/core.hpp>
    #include <opencv2/highgui.hpp>
    #include <QDebug>
    #include <QDir>
    #include <QFile>
    #include "iostream"
    
    using namespace std;
    using namespace cv;
    /*!
     * \brief scanImagePtr
     * \param image
     * \return
     */
    Mat& scanImagePtr(Mat &image){
        double start = static_cast<double>(getTickCount());
        //! 行
        int rowNumber = image.rows;
        //! 每一行元素个数 = 列数 x 通道数
        int colNumber = image.cols * image.channels();
        for (int i = 0; i < rowNumber; i++)
        {
            //! 获取第i行的首地址
            uchar* data = image.ptr<uchar>(i);
            for (int j = 0; j < colNumber; j++)
            {
                data[j] /= 2;
            }
        }
        double end = static_cast<double>(getTickCount());
        double time = (end - start) / getTickFrequency();
        cout << "type1:" << time << "s" << endl;
        return image;
    }
    
    /*!
     * \brief scanImageiterator
     * \param image
     * \return
     */
    Mat& scanImageiterator(Mat &image){
        double start = static_cast<double>(getTickCount());
        //! 初始位置的迭代器
        Mat_<Vec3b>::iterator it = image.begin<Vec3b>();
        //! 终止位置的迭代器
        Mat_<Vec3b>::iterator itend = image.end<Vec3b>();
        for (; it != itend; it++)
        {
            //! 处理BGR三个通道
            (*it)[0] = 255;//B
            //(*it)[1] = 255;//G
            //(*it)[2] = 0;//R
        }
        double end = static_cast<double>(getTickCount());
        double time = (end - start) / getTickFrequency();//计算时间
        cout << "type2:" << time << "s" << endl;
        return image;
    }
    
    /*!
     * \brief scanImageAt
     * \param image
     * \return
     */
    Mat& scanImageAt(Mat &image){
        double start = static_cast<double>(getTickCount());
        int rowNumber = image.rows;
        int colNumber = image.cols;
        for (int i = 0; i < rowNumber; i++)
            for (int j = 0; j < colNumber; j++)
            {
                //! 处理BGR三个通道
                //image.at<Vec3b>(i, j)[0] = 0;//B
                image.at<Vec3b>(i, j)[1] = 255;//G
                //image.at<Vec3b>(i, j)[2] = 0;//R
            }
        double end = static_cast<double>(getTickCount());
        double time = (end - start) / getTickFrequency();//计算时间
        cout << "type3:" << time << "s" << endl;
        return image;
    }
    int main()
    {
        //! 只创建信息头部分
        Mat oriImage;
    
        //! 读入图片
        oriImage = imread("C:/1.png", IMREAD_COLOR);
        //! 判断图片是否成功
        if (oriImage.empty()){
            qDebug("image open erro");
            return 1;
        }
    
        if (!oriImage.data){
            qDebug("image open erro");
            return 1;
        }
        //! 显示原始图片
        imshow("ori", oriImage);
    
        //! ------------------指针操作-------------------------
        Mat targetImage;
        targetImage = scanImagePtr(oriImage);
        imshow("type1", targetImage);
        //! -----------------迭代器操作------------------------
        targetImage = scanImageiterator(oriImage);
        imshow("type2", oriImage);
        //! ----------------at方式-----------------------
        targetImage = scanImageAt(oriImage);
        imshow("type3", oriImage);
        waitKey(0);
    }