sum函数声明：
CV_EXPORTS_AS(sumElems) Scalar sum(InputArray src);
其返回的是一个Scalar数据类型，
Mat s = Mat::ones(3, 3, CV_8UC1);
Scalar ss = sum(s);
cout << ss[0] << endl;输出：9
Opencv Mat元素求和sum
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Origin blog.csdn.net/oMoDao1/article/details/86512424
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