cv :: Mat的向量在它们之间链接 [英] Vector of cv::Mat are linked between them
本文介绍了cv :: Mat的向量在它们之间链接的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
std::vector<cv::Mat1f> mat = std::vector<cv::Mat1f>(10,cv::Mat1f::zeros(1,10));
mat[0]+=1;
for(size_t i=0;i<mat.size();i++)
std::cout<<mat[i]<<std::endl;
它会打印:
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
如何避免这种情况?向量初始化必须是内联的.
How can I avoid this? It would be very important that the vector initialization is inline.
推荐答案
您不能这样做. vector
构造函数使用Mat
复制构造函数,该复制构造函数仅复制标头,而不复制数据.您需要以某种方式显式使用clone()
,或每次都创建一个新矩阵:例如:
You can't do that. The vector
constructor uses the Mat
copy constructor, which only copies the header but not the data. You need to explicitly use clone()
somehow, or create a new matrix every time: E.g:
std::vector<cv::Mat1f> mat(10);
for (size_t i = 0; i < mat.size(); i++) {
mat[i] = cv::Mat1f(1, 10, 0.f);
}
或:
cv::Mat1f m = cv::Mat1f(1, 10, 0.f);
std::vector<cv::Mat1f> mat(10);
for (size_t i = 0; i < mat.size(); i++) {
mat[i] = m.clone();
}
或:
std::vector<cv::Mat1f> mat(10);
std::generate(mat.begin(), mat.end(), []() {return cv::Mat1f(1, 10, 0.f); });
或:
cv::Mat1f m = cv::Mat1f(1, 10, 0.f);
std::vector<cv::Mat1f> mat(10);
std::generate(mat.begin(), mat.end(), [&m]() {return m.clone(); });
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