Opencv imread a frame - opencv

Question

I have recently used this piece of code to save frame data from a webcam
#include <opencv\cv.h>
#include <opencv\highgui.h>
#include <opencv2/opencv.hpp>
using namespace cv;
#include <fstream>
using namespace std;
int main(int argc, char** argv)
{
VideoCapture cap(0); // open the default camera
if (!cap.isOpened()) // check if we succeeded
return -1;
cap.set(CV_CAP_PROP_FPS, 15);
Mat edges;
namedWindow("image", 1);
std::vector<cv::Mat> images(100);
for (int i = 0; i < 100; ++i) {
// this is optional, preallocation so there's no allocation
// during capture
images[i].create(480, 640, CV_8UC3);
}
for (int i = 0; i < 100; ++i)
{
Mat frame;
cap >> frame; // get a new frame from camera
frame.copyTo(images[i]);
}
cap.release();
for (int i = 0; i < 100; ++i)
{
imshow("image", images[i]);
if (waitKey(30) >= 0) break;
}
After this, I want to use imread to analyse the newly splitted frames. However, I cannot think of a way to accomplish this.
I tried: Mat colorImage = imread(images[i]);
However, it leads to:
error C2664: 'cv::Mat cv::imread(const cv::String &,int)': cannot convert argument 1 from 'std::vector<cv::Mat,std::allocator<_Ty>>' to 'const cv::String &'
with
[
_Ty=cv::Mat
]
Thanks a lot in advance :)

Answer 1

imread function is used to open the image from disk.
You already have vector of images so you just do:
Mat colorImage = images[i];
and btw. there is no need for this:
for (int i = 0; i < 100; ++i) {
// this is optional, preallocation so there's no allocation
// during capture
images[i].create(480, 640, CV_8UC3);
}
because you are allocating new space anyway except you capture the frames directly like this:
cap >> images[i];