如何确定 cv::Mat 是否为零矩阵? [英] How to determine if a cv::Mat is a zero matrix?

问题描述

我有一个根据以下代码动态更改的矩阵；

I have a matrix that is dynamically being changed according to the following code;

 for( It=all_frames.begin(); It != all_frames.end(); ++It)
{
    ItTemp = *It;

    subtract(ItTemp, Base, NewData);

    cout << "The size of the new data for ";
    cout << " is 
" << NewData.rows << "x" << NewData.cols << endl;
    cout << "The New Data is: 
" << NewData << endl << endl;

    NewData_Vector.push_back(NewData.clone());

}

我想要做的是确定 cv::Mat NewData 是零矩阵的帧.我尝试使用 cv::compare() 函数和简单的运算符(即 NewData == NoData)将它与大小相同的零矩阵进行比较，但我什至无法编译程序.

What I want to do is determine the frames at which the cv::Mat NewData is a zero matrix. I've tried comparing it to a zero matrix that is of the same size, using both the cv::compare() function and simple operators (i.e NewData == NoData), but I can't even compile the program.

是否有一种简单的方法可以确定 cv::Mat 何时填充零?

Is there a simple way of determining when a cv::Mat is populated by zeroes?

推荐答案

我用过

if (countNonZero(NewData) < 1) 
{
    cout << "Eye contact occurs in this frame" << endl;
}

这是一种非常简单(也许不是最优雅)的方法.

This is a pretty simple (if perhaps not the most elegant) way of doing it.

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