在项目开始之前，我的环境已配置完成，具体环境如何配置可参考网络教程。下面我们开始项目的实现
库的导入
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#include<iostream>#include<opencv2/opencv.hpp>#include<string.h>using namespace std;using namespace cv; |
这就不多说了
开启摄像头
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Mat frame;Mat newframe;string outputVideoPath = "F:\\C++language\\robocon.avi";VideoCapture capture(0);int frame_width = capture.get(CAP_PROP_FRAME_WIDTH);int frame_height = capture.get(CAP_PROP_FRAME_HEIGHT);VideoWriter writer; |
开始摄像头，并获取摄像头的像素高度与宽度
定义所需变量
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int num = 3;//原图片长宽皆被划分为三份，共划分成九份int stepwidth;//划分后单个图片的宽度int stepheight;//划分后的那个图片的高度int space = 5;//九宫格中每张图片的间隔 |
捕获图片并生成视频
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capture >> frame;stepwidth = frame.cols / num;stepheight = frame.rows / num;resize(frame, frame, Size(stepwidth * num, stepheight * num), 1, 1, INTER_LINEAR);newframe = Mat(Size(frame.cols + (num - 1) * space, frame.rows + (num - 1) * space), CV_8UC3, Scalar(255, 255, 255));//新画布的生成writer.open(outputVideoPath, cv::VideoWriter::fourcc('M', 'J', 'P', 'G'), 10, Size(frame.cols + (num - 1) * space, frame.rows + (num - 1) * space));if (!capture.isOpened()){ cout << "The camera cannot be opened" << endl;}if (!writer.isOpened()){ cout << "The video cannot be saved" << endl;} |
根据九宫格各张图片以及间隔的大小生成新的画布，用于存放新的九宫格图片
实现图片的抓取、转换与保存
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int count = 1; while (count <= 60) { capture >> frame; stepwidth = frame.cols / num; stepheight = frame.rows / num; resize(frame, frame, Size(stepwidth * num, stepheight * num), 1, 1, INTER_LINEAR); Mat newframe = Mat(Size(frame.cols + (num - 1) * space, frame.rows + (num - 1) * space), CV_8UC3, Scalar(255, 255, 255)); int i = 0; int j = 0; for (i = 0; i < num; i++) { for (j=0; j < num; j++) { int x = stepwidth * j; int y = stepheight * i; frame(Rect(x, y, stepwidth, stepheight)).copyTo(newframe(Rect(x + space * j, y + space * i, stepwidth, stepheight))); } } imshow("output", newframe); waitKey(100); writer << newframe; count += 1; }} |
视频以10帧的形式呈现，共60帧图片。
补充
当然OpenCV不仅可以实现录制九宫格视频，还能制作出九宫格拼图功能，下面是实现的示例代码，感兴趣的可以学习一下
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#include <iostream>#include <opencv2/core/core.hpp>#include <opencv2/highgui/highgui.hpp>#include <opencv2/imgproc/imgproc.hpp>#include <stdlib.h>#include <time.h> using namespace cv;using namespace std;Mat img = imread("C:\\picture\\aa.jpg");int m = img.cols;//宽int n = img.rows;//高cv::Mat combine = cv::Mat::zeros(m, n, img.type());Mat imgROI1 = combine(Rect(0, 0, m / 3, n / 3));Mat imgROI2 = combine(Rect(m / 3, 0, m / 3, n / 3));Mat imgROI3 = combine(Rect(m / 3 * 2, 0, m / 3, n / 3));Mat imgROI4 = combine(Rect(0, n / 3, m / 3, n / 3));Mat imgROI5 = combine(Rect(m / 3, n / 3, m / 3, n / 3));Mat imgROI6 = combine(Rect(m / 3 * 2, n / 3, m / 3, n / 3));Mat imgROI7 = combine(Rect(0, n / 3 * 2, m / 3, n / 3));Mat imgROI8 = combine(Rect(m / 3, n / 3 * 2, m / 3, n / 3));Mat imgROI9 = combine(Rect(m / 3 * 2, n / 3 * 2, m / 3, n / 3));Mat a[10];Mat imge[10];int t = 0;int first;int second;Mat temp;int f(int xx, int yy);void onMouseHandle(int event, int x, int y, int flags, void *param);int main(){ //分割图像rect() imge[1] = img(Rect(0, 0, m / 3, n / 3)); imge[2] = img(Rect(m / 3, 0, m / 3, n / 3)); imge[3] = img(Rect(m / 3 * 2, 0, m / 3, n / 3)); imge[4] = img(Rect(0, n / 3, m / 3, n / 3)); imge[5] = img(Rect(m / 3, n / 3, m / 3, n / 3)); imge[6] = img(Rect(m / 3 * 2, n / 3, m / 3, n / 3)); imge[7] = img(Rect(0, n / 3 * 2, m / 3, n / 3)); imge[8] = img(Rect(m / 3, n / 3 * 2, m / 3, n / 3)); imge[9] = img(Rect(m / 3 * 2, n / 3 * 2, m / 3, n / 3)); //生成随机数 int i, j; int b[10];//存储获取到的随机数。 int f[10] = { 0 };//存储是否获取到过。 int nx = 1; //计数器。 srand((unsigned)time(NULL));//设置随机数种子。 while (nx < 10) { int my = rand() % 10; //获取一个0~9的随机数。 if (f[my]||my==0) continue;//该数之前已经获取到过。 b[nx++] = my;//将该数存入数组。 f[my] = 1;//标记该数已经获取过。 } for (i = 1; i <= 9; i++) { a[i] = imge[b[i]]; } namedWindow("九宫格"); resize(a[1], imgROI1, imgROI1.size()); resize(a[2], imgROI2, imgROI2.size()); resize(a[3], imgROI3, imgROI3.size()); resize(a[4], imgROI4, imgROI4.size()); resize(a[5], imgROI5, imgROI5.size()); resize(a[6], imgROI6, imgROI6.size()); resize(a[7], imgROI7, imgROI7.size()); resize(a[8], imgROI8, imgROI8.size()); resize(a[9], imgROI9, imgROI9.size()); imshow("九宫格", combine); setMouseCallback("九宫格", onMouseHandle, (void*)&combine); // 等待6000 ms后窗口自动关闭 waitKey(0); return 0;}int f(int xx, int yy){ int s; if (xx + yy == 2) { s = 1; } if (xx + yy == 3 && xx > yy) { s = 2; } if (xx + yy == 4 && xx > yy) { s = 3; } if (xx + yy == 3 && xx < yy) { s = 4; } if (xx + yy == 4 && xx == yy) { s = 5; } if (xx + yy == 5 && xx > yy) { s = 6; } if (xx + yy == 4 && xx < yy) { s = 7; } if (xx + yy == 5 && xx < yy) { s = 8; } if (xx + yy == 6) { s = 9; } return s;}void onMouseHandle(int event, int x, int y, int flags, void *param){ int xx ; int yy ; switch (event) { case CV_EVENT_LBUTTONDOWN ://左键单击 { xx = x / (m / 3) + 1; yy = y / (n / 3) + 1; ++t; if (t % 2 == 1) { first = f(xx, yy); } if (t % 2 == 0) { second = f(xx, yy); if (second == first + 3 || second == first - 3 || second == first + 1 || second == first - 1) { temp = a[first]; a[first] = a[second]; a[second] = temp; resize(a[1], imgROI1, imgROI1.size()); resize(a[2], imgROI2, imgROI2.size()); resize(a[3], imgROI3, imgROI3.size()); resize(a[4], imgROI4, imgROI4.size()); resize(a[5], imgROI5, imgROI5.size()); resize(a[6], imgROI6, imgROI6.size()); resize(a[7], imgROI7, imgROI7.size()); resize(a[8], imgROI8, imgROI8.size()); resize(a[9], imgROI9, imgROI9.size()); } } imshow("九宫格", combine); } break; default: break;}} |
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原文链接：https://blog.csdn.net/qq_51444641/article/details/124730825
