OpenCV读入图像，设置大小，按键移动图像位置。

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在OpenCV编写程序实现以下功能：

• 读入图像
• 设置图像大小
• 按键移动图像位置

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实现代码

#include "opencv2/core/core.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"

#include 
#include 

using namespace cv;
using namespace std;

int main(int argc, char* argv[])
{
    char* window = "img";
    int position_x = 1000, position_y=10,fullscreen=0;

    //读取待复制图片  
    cv::Mat roi = cv::imread("D:\\P1.jpg", cv::IMREAD_COLOR);
    cv::Mat roi_2 = cv::imread("D:\\P2.jpg", cv::IMREAD_COLOR);
    //cv::imshow("roi", roi);   

    //namedWindow(window, CV_WINDOW_AUTOSIZE);
    while (true)
    {
        //设置黑色背景画布
        cv::Mat image = cv::Mat::zeros(1024, 2048, CV_8UC3);//设置画布大小
        image.setTo(cv::Scalar(0, 0, 0));//设置背景颜色       

        //设置画布绘制区域并复制  
        cv::Rect roi_rect = cv::Rect(10, 10, roi.cols, roi.rows);
        cv::Rect roi_rect_2 = cv::Rect(position_x, position_y, roi_2.cols, roi_2.rows);

        roi.copyTo(image(roi_rect));
        roi_2.copyTo(image(roi_rect_2));        

        char key = cvWaitKey(30);
        switch (key)
        {
        //ROI平移操作           
        case 'a':
            position_x -= 1; break;
        case 's':
            position_y += 1; break;
        case 'd':
            position_x += 1; break;
        case 'w':
            position_y -= 1; break;
        case 'z':
            resize(roi_2, roi_2, Size(roi_2.cols*0.999, roi_2.rows*0.999), 0, 0, INTER_LINEAR);
            break;
        case 'x':
            resize(roi_2, roi_2, Size(roi_2.cols*1.005, roi_2.rows*1.005), 0, 0, INTER_LINEAR);
            break;
        case 'p':
            fullscreen = 1;
            break;
        case 'o':
            fullscreen = 0;
            break;
        }
        if (key == 27) break;

        namedWindow("LightField", CV_WINDOW_NORMAL);
        setWindowProperty("LightField", CV_WND_PROP_FULLSCREEN, fullscreen);
        cv::imshow("LightField", image);
    }   
    return 0;
}