It is definitely a question. Please re-open.

How to (imwrite) multiple images from a live camer Hello everyone, I successfully use this code to capture and imwrite

How to (imwrite) multiple images from a live camer Hello everyone, I successfully use this code to capture and imwrite

Hello everyone,

I am new in Image processing, so I would like to know whether it is possible to bring an object that appear far in an image closer to the view of the user?

Please advice if there is any techniques in opencv or matlab that can address this issue.

Thanking you.

@break. Thank you so much. I used the OS function you suggested and it works fine for me. @Eduardo You call it a Joke? Really ? I think it's better to share something if you have any.

@berak. Thank you for the comment, but anything related to images or image processing is related to Opencv.

@sturkmen, thanks for the comment, but that won't work well if I want to use it later to save date and time in my database.

Hello everyone, I wrote a program that capture an Image from a Webcam and save the image in a folder. Now , I want to extract the date and the time that Image was taken using Opencv. I will use this extracted date and time later in another Database Program.

Thanking you,

Best Regards,

Hello everyone,

I am definitely new in OpenCV. I am current working on an automated attendance management system using face recognition. I completed the face detection part, now working on how to implement the recognition part.

I already developed my Face Database (which will be compared with the detected faces), so are there any good tutorials, demo code or links that could guide me to write the c++ code to read and write images from and to the MS access database?

Thanking you in advance,

You can use this code: Please know that we are using a single camera, but if you want to use four cameras please uncomment other additional 3 cameras in order to achive your goal ::

// USBCameraVideoCapture.cpp : 定义控制台应用程序的入口点。 //

include "stdafx.h"

include <opencv cv.h="">

include <opencv2 opencv.hpp="">

include <opencv2 core="" core.hpp="">

include <opencv2 imgproc="" imgproc.hpp="">

include <opencv2 highgui="" highgui.hpp="">

using namespace cv; using namespace std;

int _tmain() { CvCapture capture0=cvCreateCameraCapture(0);//建立opencv图像捕获对象 //CvCapture *capture1=cvCreateCameraCapture(1); /CvCapture capture2=cvCreateCameraCapture(2); CvCapture *capture3=cvCreateCameraCapture(3); CvCapture *capture4=cvCreateCameraCapture(4);/ capture0=cvCaptureFromCAM(0);//cvCaptureFromCAM函数初始化第一个摄像头的采集（索引为0）。如果索引传入的为1,那么它初始化的是第二个摄像头 //capture1=cvCaptureFromCAM(1); /capture2=cvCaptureFromCAM(2); capture3=cvCaptureFromCAM(3); capture4=cvCaptureFromCAM(4);/ IplImage frame0=NULL; //IplImage *frame1=NULL;
/IplImage frame2=NULL; IplImage *frame3=NULL; IplImage *frame4=NULL;/

double fps=20;
CvSize size0=cvSize((int)(capture0,CV_CAP_PROP_FRAME_WIDTH),(int)(capture0,CV_CAP_PROP_FRAME_HEIGHT));
CvVideoWriter *writer0=cvCreateVideoWriter("e:/test0.avi",CV_FOURCC('X','V','I','D'),fps,size0);
/*  
CvSize size1=cvSize((int)(capture1,CV_CAP_PROP_FRAME_WIDTH),(int)(capture1,CV_CAP_PROP_FRAME_HEIGHT));
CvVideoWriter *writer1=cvCreateVideoWriter("e:/test1.avi",CV_FOURCC('X','V','I','D'),fps,size1);*/

/*CvSize size2=cvSize((int)(capture2,CV_CAP_PROP_FRAME_WIDTH),(int)(capture2,CV_CAP_PROP_FRAME_HEIGHT));
CvVideoWriter *writer2=cvCreateVideoWriter("e:/test2.avi",CV_FOURCC('X','V','I','D'),fps,size2);


CvSize size3=cvSize((int)(capture3,CV_CAP_PROP_FRAME_WIDTH),(int)(capture3,CV_CAP_PROP_FRAME_HEIGHT));
CvVideoWriter *writer3=cvCreateVideoWriter("e:/test3.avi",CV_FOURCC('X','V','I','D'),fps,size3);

CvSize size4=cvSize((int)(capture4,CV_CAP_PROP_FRAME_WIDTH),(int)(capture4,CV_CAP_PROP_FRAME_HEIGHT));
CvVideoWriter *writer4=cvCreateVideoWriter("e:/test4.avi",CV_FOURCC('X','V','I','D'),fps,size4);*/

for(;;)
{
    frame0=cvQueryFrame(capture0);
    /*frame1=cvQueryFrame(capture1);*/
    /*frame2=cvQueryFrame(capture2);
    frame3=cvQueryFrame(capture3);
    frame4=cvQueryFrame(capture4);*/
    cvWriteFrame(writer0,frame0);
    //cvWriteFrame(writer1,frame1);
    /*cvWriteFrame(writer2,frame2);
    cvWriteFrame(writer3,frame3);
    cvWriteFrame(writer4,frame4);*/
    cvShowImage("camera0",frame0);
    //cvShowImage("camera1",frame1);
    /*cvShowImage("camera2",frame2);
    cvShowImage("camera3",frame3);
    cvShowImage("camera4",frame4);*/
    cvWaitKey(1000/fps);
}

cvReleaseImage(&frame0);
//cvReleaseCapture(&capture0);
cvDestroyWindow("camera0");
//cvReleaseImage(&frame1);
////cvReleaseCapture(&capture1);

// cvDestroyWindow("camera1"); //cvReleaseImage(&frame2); ////cvReleaseCapture(&capture2); //cvDestroyWindow("camera2"); //cvReleaseImage(&frame3); ////cvReleaseCapture(&capture3); //cvDestroyWindow("camera3");
// cvReleaseImage(&frame4); ////cvReleaseCapture(&capture4); //cvDestroyWindow("camera4");
return 0;

}

Hello Everyone ,

I am very new in OpenCv, so I am writing a code that will detect a face from webcam, but whenever i try to follow the sample code in the book i am using. The cv::Mat will not be recognize, but IplImage * img is always working fine.

What could be the possible problem ?

Thank you all in advance !