[英]How to copy Mat(CV_32FC1) to vector<float>*
I want to copy a mat data to vector . 我想将mat数据复制到vector。
So, now I have to that to copy mat data to "vector* Vf2" 因此,现在我必须将数据复制到“ vector * Vf2”
And I wrote this code. 我写了这段代码。
cv::Mat M=Mat(480,480,CV_32FC1,「the data ....」);
//copy vector to mat
vector< float> *Vf2;
//copy mat to vector
Vf2->assign((float*)M.datastart, (float*)M.dataend);
But, It fell without error while assign method. 但是,分配方法时没有错误。
And if vector isn't pointer. 而且如果vector不是指针。
So this below code success. 所以这下面的代码成功了。
cv::Mat M=Mat(480,480,CV_32FC1,「the data ....」);
//copy vector to mat
vector< float> Vf2;
//copy mat to vector
Vf2.assign((float*)M.datastart, (float*)M.dataend);
How to copy mat to vector<float>* Vf2
如何将mat复制到vector<float>* Vf2
Tell me someone 告诉我
sorry actuary I want to do is that copy the mat data to shared memory. 抱歉,我想做的是将垫数据复制到共享内存。 and I wrote like this code. 我写了这样的代码。
managed_shared_memory shmd(create_only, DEPTHNAME, WIDTH_PIC * HEIGHT_PIC * 4 + 1024);
std::vector<float> *ptrd=shmd.construct< std::vector<float> >("DepthImage")(); mxd->lock();
ptrd->assign((float*)decodedDepthData2.datastart,(float*)decodedDepthData2.dataend);
mxd->unlock();
By why, I want to copy the mat data to vector* 为什么,我想将垫子数据复制到矢量*
You defined a pointer to vector<float>
. 您定义了一个指向 vector<float>
的指针 。 Then you accessed it without allocating it first. 然后,您无需先分配即可访问它。 You need to initialize the pointer: vector<float> *Vf2 = new vector<float>;
您需要初始化指针: vector<float> *Vf2 = new vector<float>;
and the access the object to which it points. 并访问它指向的对象。
Don't forget to release it once you are done ( delete Vf2;
)! 完成后不要忘记释放它( delete Vf2;
)! Or consider using smart pointer . 或考虑使用智能指针 。
You shouldn't use a pointer to a vector
. 你不应该使用指向vector
的指针。
You can convert from/to vector
and Mat
: 您可以从/转换为vector
和Mat
:
#include <opencv2\opencv.hpp>
#include <vector>
using namespace std;
using namespace cv;
int main()
{
vector<float> v1{1, 2, 3, 4, 5};
// vector to Mat
Mat1f m1(v1); // not copying data, just creating the matrix header
Mat1f m2(v1, true); // copying data
// Mat to vector
vector<float> v2(m2.begin(), m2.end()); // copying data
// If you really need a pointer to a vector, then
vector<float>* v3 = new vector<float>(m2.begin(), m2.end());
// ... do your stuff
delete v3;
return 0;
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.