OpenCV设置和获取摄像头参数_opencv 设置摄像头 对比度

适用于VideoCapture打开的摄像头

VideoCapture capture(0);

设置摄像头参数 不要随意修改

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);

获取视频参数

capture.get(CV_CAP_PROP_FRAME_COUNT);//视频帧数

源代码

/**
@brief		OpenCV摄像头和视频属性操作
@author		xiaolei
@copyright	-
@version	1.0
@data		2019/10/12
@note		-
*/
#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;
}

打印结果：