Common examples opencv

1, batch convert grayscale and save

#include <iostream>
#include <opencv2/opencv.hpp>  
#include <string>
using namespace cv;
using namespace std;

int main()
{
    string fileName, grayFile;
 
    for(int i = 101; i <= 150; i++)
        for(int j = 0; j <= 23; j++)
        {
            //int 转换为 string
            stringstream ss1,ss2;  
            string str1, str2;  
            ss1 << i;    
            ss1 >> str1;  
            ss2 << j;
            ss2 >> str2;

            fileName = "srcImage/Tester_" + str1 + "TrainingPosepose_" + str2 + ".jpg";
            grayFile = "grayImage/Gray_Tester_" + str1 + "TrainingPosepose_" + str2 + ".jpg";
            //cout << fileName << endl;

            Mat srcImage = imread(fileName), grayImage;
            cvtColor(srcImage,grayImage,CV_BGR2GRAY);
            
            imwrite( grayFile, grayImage);
        }
    system("pause");
    return 0;
}

opencv batch conversion of grayscale and save - kuotian - blog Park https://www.cnblogs.com/kuotian/p/6365613.html

 

2, reading video files, video display

VideoCapture(0);

• VideoCapture capture; 
• capture.open ( "video.mp4"); Method class // VideoCapture 
• // 0:00 to open the usb camera. Enter a correct URL, you can load videos on the web

fourcc = cv2.VideoWriter_fourcc (* 'XVID') # specify the encoding format, Windows uses XVID, note that the wording is fixed

out = cv2.VideoWriter ( 'output.avi', fourcc, 20.0, (640,480)) # define a video storage object, and a video encoding method, frame rate, video format size, and finally a grayscale setting (default True color, but I tried to change the video False generate an error occurs)

 

OpenCV study notes (2) - How to process the video with OpenCV - blog Park - Zodiac7 https://www.cnblogs.com/zodiac7/p/9270529.htm L

The study notes --Opencv video processing module - gwpscut's blog - CSDN blog https://blog.csdn.net/gwplovekimi/article/details/80545274