访问“垫"中的矩阵元素. OpenCV C ++中的对象(不是CvMat对象) [英] Accessing a matrix element in the "Mat" object (not the CvMat object) in OpenCV C++

问题描述

如何在OpenCV 2.0的新"Mat"类中逐行访问元素?文档链接在下面，但我无法理解. http://opencv.willowgarage.com/documentation/cpp/basic_structures.html#mat

How to access elements by row, col in OpenCV 2.0's new "Mat" class? The documentation is linked below, but I have not been able to make any sense of it. http://opencv.willowgarage.com/documentation/cpp/basic_structures.html#mat

推荐答案

在文档中:

http://docs.opencv.org/2.4/modules/core/doc/basic_structures.html#mat

它说:

(...)，如果您知道矩阵元素 类型，例如它是浮动的，那么你可以 使用at<>()方法

(...) if you know the matrix element type, e.g. it is float, then you can use at<>() method

也就是说，您可以使用:

That is, you can use:

Mat M(100, 100, CV_64F);
cout << M.at<double>(0,0);

也许使用Mat_类更容易.它是Mat的模板包装. Mat_具有operator()重载以访问元素.

Maybe it is easier to use the Mat_ class. It is a template wrapper for Mat. Mat_ has the operator() overloaded in order to access the elements.

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