OpenCV VideoCapture 设置和获取摄像头参数

OpenCV VideoCapture 设置和获取摄像头参数

VideoCapture capture(0);

设置相关的摄像头参数（不要轻易改变）

 capture.set(CV_CAP_PROP_FRAME_WIDTH, 1080);//宽度 
 capture.set(CV_CAP_PROP_FRAME_HEIGHT, 960);//高度
 capture.set(CV_CAP_PROP_FPS, 30);//帧率 帧/秒
 capture.set(CV_CAP_PROP_BRIGHTNESS, 1);//亮度 1
 capture.set(CV_CAP_PROP_CONTRAST,40);//对比度 40
 capture.set(CV_CAP_PROP_SATURATION, 50);//饱和度 50
 capture.set(CV_CAP_PROP_HUE, 50);//色调 50
 capture.set(CV_CAP_PROP_EXPOSURE, 50);//曝光 50

获取摄像头参数

capture.get(CV_CAP_PROP_FRAME_WIDTH);
capture.get(CV_CAP_PROP_FRAME_HEIGHT);
capture.get(CV_CAP_PROP_FPS);
capture.get(CV_CAP_PROP_BRIGHTNESS);
capture.get(CV_CAP_PROP_CONTRAST);
capture.get(CV_CAP_PROP_SATURATION);
capture.get(CV_CAP_PROP_HUE);
capture.get(CV_CAP_PROP_EXPOSURE);

示范代码

#include <iostream>
#include "opencv2/opencv.hpp"

using namespace std;
using namespace cv;

const string window_name = "用户界面";

#define USE_CAMERA
//#define USE_VIDEO

int main()
{
    Mat frame;

    double brightness = 0;        //亮度
    double contrast = 0;        //对比度
    double saturation = 0;        //饱和度
    double hue = 0;                //色调
    double gain = 0;            //增益
    double exposure = 0;        //曝光
    double white_balance = 0;    //白平衡

    double pos_msec = 0;        //当前视频位置(ms)
    double pos_frame = 0;        //从0开始下一帧的索引
    double pos_avi_ratio = 0;    //视频中的相对位置(范围为0.0到1.0)
    double frame_width = 0;        //视频帧的像素宽度
    double frame_height = 0;    //视频帧的像素高度
    double fps = 0;                //帧速率
    double frame_count = 0;        //视频总帧数
    double video_duration = 0.00;    //视频时长
    double format = 0;            //格式

#ifdef USE_VIDEO
    const string file_name = "201910915314.avi";
    VideoCapture capture(file_name);

    frame_width = capture.get(cv::CAP_PROP_FRAME_WIDTH);
    frame_height = capture.get(cv::CAP_PROP_FRAME_HEIGHT);
    fps = capture.get(cv::CAP_PROP_FPS);
    frame_count = capture.get(cv::CAP_PROP_FRAME_COUNT);
    format = capture.get(cv::CAP_PROP_FORMAT);
    pos_avi_ratio = capture.get(cv::CAP_PROP_POS_AVI_RATIO);
    video_duration = frame_count / fps;

    cout << "---------------------------------------------" << endl;
    cout << "视频中的相对位置(范围为0.0到1.0):" << pos_avi_ratio << endl;
    cout << "视频帧的像素宽度:" << frame_width << endl;
    cout << "视频帧的像素高度:" << frame_height << endl;
    cout << "录制视频的帧速率(帧/秒):" << fps << endl;
    cout << "视频文件总帧数:" << frame_count << endl;
    cout << "图像的格式:" << format << endl;
    cout << "视频时长:" << video_duration << endl;
    cout << "---------------------------------------------" << endl;
#endif // USE_VIDEO

#ifdef USE_CAMERA
    VideoCapture capture(0);
    brightness = capture.get(cv::CAP_PROP_BRIGHTNESS);
    contrast= capture.get(cv::CAP_PROP_CONTRAST);
    saturation = capture.get(cv::CAP_PROP_SATURATION);
    hue = capture.get(cv::CAP_PROP_HUE);
    gain = capture.get(cv::CAP_PROP_GAIN);
    exposure = capture.get(cv::CAP_PROP_EXPOSURE);
    white_balance = capture.get(cv::CAP_PROP_WHITE_BALANCE_BLUE_U);

    std::cout << "---------------------------------------------" << endl;
    std::cout << "摄像头亮度：" << brightness << endl;
    std::cout << "摄像头对比度：" << contrast << endl;
    std::cout << "摄像头饱和度：" << saturation << endl;
    std::cout << "摄像头色调：" << hue << endl;
    std::cout << "摄像头增益：" << gain << endl;
    std::cout << "摄像头曝光度：" << exposure << endl;
    std::cout << "摄像头白平衡：" << white_balance << endl;
    std::cout << "---------------------------------------------" << endl;
#endif // USE_CAMERA

    namedWindow(window_name,WINDOW_AUTOSIZE);
    while (capture.isOpened())
    {
        capture >> frame;

#ifdef USE_VIDEO
        pos_msec = capture.get(cv::CAP_PROP_POS_MSEC);
        pos_frame = capture.get(cv::CAP_PROP_POS_FRAMES);
        pos_avi_ratio = capture.get(cv::CAP_PROP_POS_AVI_RATIO);
        cout << "---------------------------------------------" << endl;
        cout << "视频文件中当前位置(ms):" << pos_msec << endl;
        cout << "从0开始下一帧的索引:" << pos_frame << endl;
        cout << "视频中的相对位置(范围为0.0到1.0):" << pos_avi_ratio << endl;
        cout << "---------------------------------------------" << endl;
#endif // USE_VIDEO

        imshow(window_name, frame);
        if (waitKey(60)==27)
        {
            break;
        }
    }
    capture.release();
    destroyAllWindows();
    return 0;
}

Reference：
https://www.cnblogs.com/ybqjymy/p/12510042.html

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