重塑矩阵在OpenCV 2.4.3中失败 [英] reshaping a matrix failed in OpenCV 2.4.3

问题描述

我正在使用OpenCV 2.4.3创建和重塑矩阵，如下所示:

I am using OpenCV 2.4.3 to create and reshape a matrix like this:

cv::Mat testMat = cv::Mat::zeros ( 500, 200, CV_8UC3 );
std::cout << "size of testMat: " << testMat.rows << " x " << testMat.cols << std::endl;

testMat.reshape ( 0, 1 );
std::cout << " size of reshaped testMat: " << testMat.rows << " x " << testMat.cols << std::endl;

然后从输出中，我看到重塑的testMat没有任何变化.我在旧版本的OpenCV中多次使用了重塑"功能，但是在这个新版本中，我看不到任何更改.这是一个错误吗?还是我在这里使用不正确?

Then from the output, I see there is no change for the reshaped testMat. I used "reshape" many times in older version of OpenCV, but with this new version, I couldn't see any changes. Is this a bug? Or am I using it incorrectly here?

推荐答案

reshape返回新的Mat标头

reshape returns a new Mat header

cv::Mat testMat = cv::Mat::zeros ( 500, 200, CV_8UC3 );
std::cout << "size of testMat: " << testMat.rows << " x " << testMat.cols << std::endl;

cv::Mat result = testMat.reshape ( 0, 1 );
std::cout << " size of original testMat: " << testMat.rows << " x " << testMat.cols << std::endl;
std::cout << " size of reshaped testMat: " << result.rows << " x " << result.cols << std::endl;

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