如何在 OpenCV 中检查两个矩阵是否相同 [英] how to check whether two matrices are identical in OpenCV

问题描述

我有两个 cv::Mat 实例:m1 和 m2.它们具有相同的数字类型和大小.OpenCV 中是否有任何函数返回矩阵是否相同(具有所有相同的值)?

I have two instances of cv::Mat : m1 and m2. They are of the same numeric type and sizes. Is there any function in OpenCV that returns whether the matrices are identical (have all the same values)?

推荐答案

正如 Acme 提到的，你可以使用 cv::compare 虽然它不像你希望的那么干净.
在以下示例中，使用 cv::compare"noreferrer">!= 运算符:

As mentioned by Acme, you can use cv::compare although it is not as clean as you might hope.
In the following example, cv::compare is called by using the != operator:

// Get a matrix with non-zero values at points where the 
// two matrices have different values
cv::Mat diff = a != b;
// Equal if no elements disagree
bool eq = cv::countNonZero(diff) == 0;

据推测，通过比较元素进行迭代会更快吗?如果您知道类型，您可以使用 STL equal 函数:

Presumably it would be quicker to just iterate through comparing the elements though? If you know the type you could use the STL equal function:

bool eq = std::equal(a.begin<uchar>(), a.end<uchar>(), b.begin<uchar>());

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