適用於VideoCapture打開的攝像頭
VideoCapture capture(0);
設置攝像頭參數 不要隨意修改
1 capture.set(CV_CAP_PROP_FRAME_WIDTH, 1080);//寬度
2 capture.set(CV_CAP_PROP_FRAME_HEIGHT, 960);//高度
3 capture.set(CV_CAP_PROP_FPS, 30);//幀率 幀/秒
4 capture.set(CV_CAP_PROP_BRIGHTNESS, 1);//亮度 1
5 capture.set(CV_CAP_PROP_CONTRAST,40);//對比度 40
6 capture.set(CV_CAP_PROP_SATURATION, 50);//飽和度 50
7 capture.set(CV_CAP_PROP_HUE, 50);//色調 50
8 capture.set(CV_CAP_PROP_EXPOSURE, 50);//曝光 50
獲取攝像頭參數
1 capture.get(CV_CAP_PROP_FRAME_WIDTH); 2 capture.get(CV_CAP_PROP_FRAME_HEIGHT); 3 capture.get(CV_CAP_PROP_FPS); 4 capture.get(CV_CAP_PROP_BRIGHTNESS); 5 capture.get(CV_CAP_PROP_CONTRAST); 6 capture.get(CV_CAP_PROP_SATURATION); 7 capture.get(CV_CAP_PROP_HUE); 8 capture.get(CV_CAP_PROP_EXPOSURE);
源代碼
1 /** 2 @brief OpenCV攝像頭和視頻屬性操作 3 @author 4 @copyright - 5 @version 1.0 6 @data 7 @note - 8 */
9 #include <iostream>
10 #include "opencv2/opencv.hpp"
11
12 using namespace std; 13 using namespace cv; 14
15 const string window_name = "用戶界面"; 16
17 #define USE_CAMERA
18 //#define USE_VIDEO
19
20 int main() 21 { 22 Mat frame; 23
24 double brightness = 0; //亮度
25 double contrast = 0; //對比度
26 double saturation = 0; //飽和度
27 double hue = 0; //色調
28 double gain = 0; //增益
29 double exposure = 0; //曝光
30 double white_balance = 0; //白平衡
31
32 double pos_msec = 0; //當前視頻位置(ms)
33 double pos_frame = 0; //從0開始下一幀的索引
34 double pos_avi_ratio = 0; //視頻中的相對位置(范圍為0.0到1.0)
35 double frame_width = 0; //視頻幀的像素寬度
36 double frame_height = 0; //視頻幀的像素高度
37 double fps = 0; //幀速率
38 double frame_count = 0; //視頻總幀數
39 double video_duration = 0.00; //視頻時長
40 double format = 0; //格式
41
42 #ifdef USE_VIDEO 43 const string file_name = "201910915314.avi"; 44 VideoCapture capture(file_name); 45
46 frame_width = capture.get(cv::CAP_PROP_FRAME_WIDTH); 47 frame_height = capture.get(cv::CAP_PROP_FRAME_HEIGHT); 48 fps = capture.get(cv::CAP_PROP_FPS); 49 frame_count = capture.get(cv::CAP_PROP_FRAME_COUNT); 50 format = capture.get(cv::CAP_PROP_FORMAT); 51 pos_avi_ratio = capture.get(cv::CAP_PROP_POS_AVI_RATIO); 52 video_duration = frame_count / fps; 53
54 cout << "---------------------------------------------" << endl; 55 cout << "視頻中的相對位置(范圍為0.0到1.0):" << pos_avi_ratio << endl; 56 cout << "視頻幀的像素寬度:" << frame_width << endl; 57 cout << "視頻幀的像素高度:" << frame_height << endl; 58 cout << "錄制視頻的幀速率(幀/秒):" << fps << endl; 59 cout << "視頻文件總幀數:" << frame_count << endl; 60 cout << "圖像的格式:" << format << endl; 61 cout << "視頻時長:" << video_duration << endl; 62 cout << "---------------------------------------------" << endl; 63 #endif // USE_VIDEO
64
65 #ifdef USE_CAMERA 66 VideoCapture capture(0); 67 brightness = capture.get(cv::CAP_PROP_BRIGHTNESS); 68 contrast= capture.get(cv::CAP_PROP_CONTRAST); 69 saturation = capture.get(cv::CAP_PROP_SATURATION); 70 hue = capture.get(cv::CAP_PROP_HUE); 71 gain = capture.get(cv::CAP_PROP_GAIN); 72 exposure = capture.get(cv::CAP_PROP_EXPOSURE); 73 white_balance = capture.get(cv::CAP_PROP_WHITE_BALANCE_BLUE_U); 74
75 std::cout << "---------------------------------------------" << endl; 76 std::cout << "攝像頭亮度：" << brightness << endl; 77 std::cout << "攝像頭對比度：" << contrast << endl; 78 std::cout << "攝像頭飽和度：" << saturation << endl; 79 std::cout << "攝像頭色調：" << hue << endl; 80 std::cout << "攝像頭增益：" << gain << endl; 81 std::cout << "攝像頭曝光度：" << exposure << endl; 82 std::cout << "攝像頭白平衡：" << white_balance << endl; 83 std::cout << "---------------------------------------------" << endl; 84 #endif // USE_CAMERA
85
86 namedWindow(window_name,WINDOW_AUTOSIZE); 87 while (capture.isOpened()) 88 { 89 capture >> frame; 90
91 #ifdef USE_VIDEO 92 pos_msec = capture.get(cv::CAP_PROP_POS_MSEC); 93 pos_frame = capture.get(cv::CAP_PROP_POS_FRAMES); 94 pos_avi_ratio = capture.get(cv::CAP_PROP_POS_AVI_RATIO); 95 cout << "---------------------------------------------" << endl; 96 cout << "視頻文件中當前位置(ms):" << pos_msec << endl; 97 cout << "從0開始下一幀的索引:" << pos_frame << endl; 98 cout << "視頻中的相對位置(范圍為0.0到1.0):" << pos_avi_ratio << endl; 99 cout << "---------------------------------------------" << endl; 100 #endif // USE_VIDEO
101
102 imshow(window_name, frame); 103 if (waitKey(60)==27) 104 { 105 break; 106 } 107 } 108 capture.release(); 109 destroyAllWindows(); 110 return 0; 111 }
打印結果：
