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sudo apt-get install libopencv-dev

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#include <opencv2/opencv.hpp>

int main() {
 cv::VideoCapture cap(0); // ·­¿ªÏà»ú×°±¸£¬0ÌåÏÖĬÈÏÏà»ú
 
 if (!cap.isOpened()) { // ÅжÏÏà»úÊÇ·ñÀֳɷ­¿ª
     std::cout << "Ïà»úÎÞ·¨·­¿ª£¡" << std::endl;
     return -1;
 }
 
 cv::Mat frame;
 while (true) {
     cap >> frame; // ´ÓÏà»úÖжÁȡһ֡ͼÏñ
     
     cv::imshow("Camera", frame); // ÏÔʾͼÏñ
     
     if (cv::waitKey(1) == 'q') { // °´Ï 'q' ¼üÍ˳öÑ­»·
         break;
     }
 }
 
 return 0;
}

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#include <opencv2/opencv.hpp>

int main() {
 cv::Mat image = cv::imread("image.jpg"); // ¶ÁȡͼÏñÎļþ
 
 if (image.empty()) { // ÅжÏͼÏñÊÇ·ñÀֳɶÁÈ¡
     std::cout << "ͼÏñÎÞ·¨¼ÓÔØ£¡" << std::endl;
     return -1;
 }
 
 cv::cvtColor(image, image, cv::COLOR_BGR2GRAY); // ½«²ÊɫͼÏñת»»Îª»Ò¶ÈͼÏñ
 
 cv::imshow("Gray Image", image); // ÏÔʾ´¦ÀíºóµÄͼÏñ
 cv::waitKey(0);
 
 return 0;
}

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#include <opencv2/opencv.hpp>

int main() {
 cv::VideoCapture cap(0); // ·­¿ªÏà»ú×°±¸£¬0ÌåÏÖĬÈÏÏà»ú
 
 if (!cap.isOpened()) { // ÅжÏÏà»úÊÇ·ñÀֳɷ­¿ª
     std::cout << "Ïà»úÎÞ·¨·­¿ª£¡" << std::endl;
     return -1;
 }
 
 cv::Mat frame;
 while (true) {
     cap >> frame; // ´ÓÏà»úÖжÁȡһ֡ͼÏñ
     
     cv::cvtColor(frame, frame, cv::COLOR_BGR2GRAY); // ½«²ÊɫͼÏñת»»Îª»Ò¶ÈͼÏñ
     
     cv::imshow("Processed Image", frame); // ÏÔʾ´¦ÀíºóµÄͼÏñ
     
     if (cv::waitKey(1) == 'q') { // °´Ï 'q' ¼üÍ˳öÑ­»·
         break;
     }
 }
 
 return 0;
}

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