c语言opencv设置采集图像的图像宽高

电玩女神 2023-01-22 05:59 51阅读 0赞

### c语言opencv设置采集图像的图像宽高 ###

*  c语言版本
 *  python版本
 *  设置摄像头参数 谨慎修改！！
 *  获取摄像头参数

# c语言版本 #

VideoCapture capture;
    	capture.open(1);
    	if (!capture.isOpened())
    	{ 
    		printf("文件打开失败");
    	}
    	capture.set(CAP_PROP_FRAME_WIDTH, SRC_WIDTH);        //设置宽度
    	capture.set(CAP_PROP_FRAME_HEIGHT, SRC_HEIGHT);  //设置长度

# python版本 #

cap = cv2.VideoCapture(0) #打开默认摄像头采集图像
    
    width = 640  #定义摄像头获取图像宽度
    height = 480   #定义摄像头获取图像长度
    
    cap.set(cv2.CAP_PROP_FRAME_WIDTH, width)  #设置宽度
    cap.set(cv2.CAP_PROP_FRAME_HEIGHT, height)  #设置长度

# 设置摄像头参数 谨慎修改！！ #

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);

注意：opencv3和opencv4的宏定义有些区别  
opencv4如下：

capture.get(CAP_PROP_FRAME_WIDTH);
    	capture.get(CAP_PROP_FRAME_HEIGHT);
    	capture.get(CAP_PROP_FPS);

c语言完整程序

/***************************************************** 2021.5.7： opencv_capture_from_usb.cpp ******************************************************/
    #include "opencv2/core/core.hpp" 
    #include "opencv2/imgproc/imgproc.hpp" 
    #include "opencv2/calib3d/calib3d.hpp" 
    #include "opencv2/highgui/highgui.hpp" 
    #include <iostream> 
    #include <fstream> 
    #include <conio.h> 
    
    using namespace cv;
    using namespace std;
    
    #define SRC_WIDTH 1920
    #define SRC_HEIGHT 1080
    
    int main()
    { 
    	//测试视频
    	VideoCapture capture;
    	capture.open(1);
    	//capture.open("v4l2src device=/dev/video4 ! video/x-raw,width=1920,height=1020,framerate=30/1 ! videoconvert ! appsink");
    	if (!capture.isOpened())
    	{ 
    		printf("文件打开失败");
    	}
    	capture.set(CAP_PROP_FRAME_WIDTH, SRC_WIDTH);        //设置宽度
    	capture.set(CAP_PROP_FRAME_HEIGHT, SRC_HEIGHT);  //设置长度
    	Mat frame;
    	int n = 0;
    	char* cstr = new char[120];
    	while (true)
    	{ 
    		
    		capture >> frame;
    		if (frame.data == NULL)
    		{ 
    			printf("Image is empty\n");
    			//writer.write(frame);
    			break;
    			//continue;
    		}
    		char kk=waitKey(2);
    		if (kk == 'S' || kk == 's')
    		{ 
    
    			sprintf(cstr, "%s%d%s", "caliberation/", n++, ".jpg");
    			imwrite(cstr, frame);
    			printf("保存了图片\n");
    
    		}
    
    		
    		namedWindow("111", 0);//参数为零，则可以自由拖动
    		imshow("111", frame);
    		waitKey(2);
    	}
    
    	return 0;
    
    }