C++ OpenCV中矩阵中元素的总和？
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Sum of elements in a matrix in OpenCV?
提问by kadu
I need to sum all the elements in a matrix. I used the function
我需要对矩阵中的所有元素求和。我用的功能
sum(sum(A));
in matlab. Where Ais a matrix of size 300*360.
I want to implement the same function in OpenCV. I used something like this.
在matlab中。其中A是大小为 300*360 的矩阵。我想在 OpenCV 中实现相同的功能。我用过这样的东西。
double s=cv::sum(cv::sum(A));
But there is error showing cannot convert scalar to double. How to fix this problem?
但是有错误显示无法将标量转换为双精度。如何解决这个问题？
回答by Shai
Unlike Matlab, in opencv, cv::sum(A)sums along ALL dimensions and returns a single number (scalar) that is equal to Matlab's sum(sum(A)).
So, what you need is
与 Matlab 不同，在 opencv 中，cv::sum(A)沿所有维度求和并返回一个等于 Matlab 的sum(sum(A)).
所以，你需要的是
double s = cv::sum( A )[0];
