The copy operation for mat: cv::Mat::clone() or cv::Mat::copyTo().
Most of the copying interfaces are under the reference count mechanism.

All image information is expressed by a single matrix in OpenCV. The tuple (r, g, b) is used by men to watch the colorful world.

#include <iostream>
#include <stdio.h>
#include <opencv2/opencv.hpp>

using namespace cv;
using namespace std;

int main()
{
    Mat image( 2, 2, CV_8UC3, Scalar(0,255,0) ); // b , g , r
    cout << "image= " << image << endl;

    namedWindow("Display Image", WINDOW_AUTOSIZE );
    imshow("Display Image", image);

    waitKey(0);
    return 0;
}



The constructor in the above code snippet has the following definition.

    /** @overload
    @param rows Number of rows in a 2D array.
    @param cols Number of columns in a 2D array.
    @param type Array type. Use CV_8UC1, ..., CV_64FC4 to create 1-4 channel matrices, or
    CV_8UC(n), ..., CV_64FC(n) to create multi-channel (up to CV_CN_MAX channels) matrices.
    @param s An optional value to initialize each matrix element with. To set all the matrix elements to
    the particular value after the construction, use the assignment operator
    Mat::operator=(const Scalar& value) .
    */
    Mat(int rows, int cols, int type, const Scalar& s);

How to define array type:

CV_[The number of bits per item][Signed or Unsigned][Type Prefix]C[The channel number]

eg:
Mat image( 2, 2, CV_8UC4, Scalar(0,255,0, 155) ); // b , g , r, transparent

Categories: OpenCV

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