C++如何输出cv::mat数据类型 |21xrx.com

C++如何输出cv::mat数据类型

2023-07-08 08:21:14 深夜i -- --

C++ Output cv::mat Data Type

C++ programming language is widely used in computer vision applications. One of the most commonly used data types in computer vision is the cv::Mat data type. This data type represents a matrix or an image, and it is used in various image processing operations.

When programming in C++, it is essential to know how to output the cv::Mat data type. There are several ways to do this, but the easiest and most common method is to use the std::cout operator.

The cv::Mat data type is a matrix, and it can be displayed using the std::cout.operator by iterating through the matrix rows and columns. Here is an example code that shows how to output a cv::Mat matrix using the std::cout operator.


#include <opencv2/opencv.hpp>
#include <iostream>
using namespace std;
using namespace cv;
int main()
{
  Mat image = imread("myimage.jpg", IMREAD_GRAYSCALE);
  for (int i = 0; i < image.rows; i++)
  {
    for (int j = 0; j < image.cols; j++)
    {
      cout << image.at<uchar>(i,j) << " ";
    }
    cout << endl;
  }
  return 0;
}

In this code, we first read an image in grayscale mode and store it in the cv::Mat data type. Then, we iterate through the rows and columns of the matrix using two for loops and output each pixel value one by one using the std::cout operator.

Another way to output the cv::Mat data type is to use the imwrite function provided by the OpenCV library. This function can be used to write the cv::Mat data type to an image file on disk. Here is an example code that shows how to use the imwrite function.


#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
int main()
{
  Mat image = imread("myimage.jpg", IMREAD_GRAYSCALE);
  imwrite("output.jpg", image);
  return 0;
}

In this code, we first read the image in grayscale mode and store it in the cv::Mat data type. Then, we use the imwrite function to write the cv::Mat data type to an image file on disk. The function takes two arguments: the filename and the cv::Mat data type.

In conclusion, the cv::Mat data type is widely used in computer vision applications, and it is essential to know how to output it properly. The std::cout operator and the imwrite function are two common methods to output the cv::Mat data type, and they can be used based on the specific requirements of the application.

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