在OpenCV中向矩阵添加一行 [英] Add a row to a matrix in OpenCV

问题描述

这是一个非常简单的问题，但是我无法在Google或OpenCV文档中找到答案.如何在cv::Mat的底部插入带有向量或默认数字的行?我试过了:

This is a very simple question but I couldn't find the answer in Google or in OpenCV documentation. How do you insert a row with either a vector or a default number at the bottom of a cv::Mat? I tried:

std::vector<double> v = {0, 0, 1};
m.push_back(v);

可以编译，但是它总是让我得到一个断言错误.正确的方法是什么?

which compiles, but it always gets me an assertion error. What is the right way to do it?

推荐答案

添加的元素必须是与容器矩阵具有相同列数的Mat:

The added element must be a Mat with the same number of columns as the container matrix:

cv::Mat m = cv::Mat::ones(4, 3, CV_64F);    // 3 cols, 4 rows
cv::Mat row = cv::Mat::ones(1, 3, CV_64F);  // 3 cols, 1 row
m.push_back(row);                           // 3 cols, 5 rows

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