直播软件开发，图像视频的读取与保存，以及调用相机拍摄

直播软件开发，图像视频的读取与保存，以及调用相机拍摄实现的相关代码

1、图片的读取、显示和保存

<br>//图片的读取与保存<br>#include <stdio.h><br>#include <iostream><br>#include <string><br>#include <opencv2\opencv.hpp><br>using namespace std;<br>using namespace cv;<br>int main()<br>{<br>cv::Mat a;<br>a = cv::imread("picture.jpeg", IMREAD_GRAYSCALE);//以灰色图像读取<br>if (!a.empty())<br>{<br>cout << "图像读取成功" << endl;<br>}<br>else<br>return -1;<br>cv::namedWindow("小黄人",WINDOW_NORMAL);//WINDOW_NORMAL使窗口可以调整大小，更多可选参数查看源码<br>cv::imshow("小黄人", a);<br>if (cv::imwrite("picture_gray.png", a))<br>{<br>cout << "图像保存成功" << endl;<br>}<br>else<br>cout << "图像保存失败" << endl;<br>cv::waitKey(0);//防止图片一闪而过<br>return 0;<br>}

2、视频的读取、显示和保存

<br>//视频的读取与显示<br>#include <stdio.h><br>#include <iostream><br>#include <string><br>#include <opencv2\opencv.hpp><br>using namespace std;<br>using namespace cv;<br>int main()<br>{<br>VideoCapture video("xiaohuangren.mp4");<br>if (!video.isOpened())<br>{<br>cout << "视频打不开" << endl;<br>}<br>else<br>{<br>cout << "视频中图像的宽度：" << video.get(CAP_PROP_FRAME_WIDTH) << endl;<br>cout << "视频中图像的高度：" << video.get(CAP_PROP_FRAME_HEIGHT) << endl;<br>cout << "视频的帧率：" << video.get(CAP_PROP_FPS) << endl;<br>cout << "视频的总帧数：" << video.get(CAP_PROP_FRAME_COUNT) << endl;<br>}<br>while (1)<br>{<br>Mat frame;<br>video >> frame;<br>if (frame.empty())<br>{<br>break;//所有帧图像都赋值给frame后再赋值一次frame变为空<br>}<br>cv::imshow("小黄人", frame);<br>waitKey(1000 / video.get(CAP_PROP_FPS));<br>}<br>waitKey(0);<br>return 0;<br>}<br>//调用摄像头进行拍摄显示<br>#include <stdio.h><br>#include <iostream><br>#include <string><br>#include <opencv2\opencv.hpp><br>using namespace std;<br>using namespace cv;<br>int main()<br>{<br>VideoCapture video(0);//0表示摄像头的ID号<br>if (!video.isOpened())<br>{<br>cout << "视频打不开" << endl;<br>}<br>else<br>{<br>cout << "视频中图像的宽度：" << video.get(CAP_PROP_FRAME_WIDTH) << endl;<br>cout << "视频中图像的高度：" << video.get(CAP_PROP_FRAME_HEIGHT) << endl;<br>cout << "视频的帧率：" << video.get(CAP_PROP_FPS) << endl;<br>cout << "视频的总帧数：" << video.get(CAP_PROP_FRAME_COUNT) << endl;<br>}<br>while (1)<br>{<br>Mat frame;<br>video >> frame;<br>cv::imshow("你", frame);<br>waitKey(10);<br>}<br>waitKey(0);<br>return 0;<br>}<br>//调用摄像头进行拍摄并保存视频<br>#include <stdio.h><br>#include <iostream><br>#include <string><br>#include <opencv2\opencv.hpp><br>using namespace std;<br>using namespace cv;<br>int main()<br>{<br>Mat img;<br>VideoCapture video(0);<br>if (video.isOpened())<br>{<br>cout << "摄像头打开成功" << endl;<br>}<br>else<br>{<br>cout << "摄像头打开失败" << endl;<br>return -1;<br>}<br>video >> img;<br>if (img.empty())<br>{<br>cout << "图片拍摄失败" << endl;<br>}<br>bool is_color = (img.type() == CV_8UC3);//判断图片是否为彩色图像<br>VideoWriter writer;<br>int video_encode = VideoWriter::fourcc('D','I','V','X');<br>writer.open("video_camera.mp4", video_encode, 30, img.size(), is_color);//30表示帧率<br>while (1)<br>{<br>if (!(video.read(img)))<br>{<br>cout << "摄像头读取完毕或者摄像头断开连接" << endl;<br>break;<br>}<br>writer.write(img);<br>imshow("video", img);<br>char c = waitKey(50);<br>if (c == 27)<br>{<br>break;<br>}<br>}<br>return 0;<br>}

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