Programming Language: C++ (Cpp)

Namespace/Package Name: cv

Class/Type: Mat

Method/Function: col

Examples at hotexamples.com: 30

The "cv::Mat col" function in OpenCV is part of the 'core' module of the library. It is used to access and manipulate columns of matrices stored in OpenCV's Matrix class.

The function takes a single parameter, which is the index of the column to be accessed. The returned value is a new Mat object that represents the column.

Here are a few examples of using 'cv::Mat col' function in C++:

**Example 1:** Accessing a single column of a matrix

**Example 2:** Using the returned column Mat object to modify the original matrix

**Example 3:** Using the 'cv::Mat col' function to create a new matrix from a single column

The function takes a single parameter, which is the index of the column to be accessed. The returned value is a new Mat object that represents the column.

Here are a few examples of using 'cv::Mat col' function in C++:

cv::Mat mat = cv::Mat::ones(3, 3, CV_8UC1); // create a 3x3 matrix of ones cv::Mat column = mat.col(1); // get the second column (index 1)

cv::Mat mat = cv::Mat::ones(3, 3, CV_8UC1); // create a 3x3 matrix of ones cv::Mat column = mat.col(1); // get the second column (index 1) column.setTo(cv::Scalar(255)); // set all the elements in the column to 255 std::cout << mat << std::endl; // print the original matrix, which now has a column of 255s

cv::Mat mat = cv::Mat::ones(3, 3, CV_32FC1); // create a 3x3 matrix of ones cv::Mat column = mat.col(1); // get the second column (index 1) cv::Mat newMat = cv::Mat::zeros(mat.rows, 1, CV_32FC1); // create a new 3x1 matrix of zeros column.copyTo(newMat.col(0)); // copy the second column from the original matrix to the new matrix std::cout << newMat << std::endl; // print the new matrix, which has a single column of 1s

Frequently Used Methods

Frequently Used Methods

Frequently Used Methods

Frequently Used Methods