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Two possibilities : Don't use allocated memory copy each pixel in a Mat example image of type CV_16SC1

short *tmp=new short[256*256];
......  

cv::Mat m(256,256,CV_16S);
for (int i=0;i<256;i++)
    for (int j=0;j<256;j++)
        {
        m.at< short >(i,j)=tmp[i*256+j];
        }

and another way use memory still allocated

short tmp=new short[256256]; ......

cv::Mat m(256,256,CV_16S,(void *) tmp,AUTO_STEP);

In that case "The external data is not automatically deallocated, so you should take care of it."

Two possibilities : Don't use allocated memory copy each pixel in a Mat example image of type CV_16SC1

short *tmp=new short[256*256];
......  

cv::Mat m(256,256,CV_16S);
for (int i=0;i<256;i++)
    for (int j=0;j<256;j++)
        {
        m.at< short >(i,j)=tmp[i*256+j];
        }

and another way use memory still allocated

short tmp=new short[256256];
*tmp=new short[256*256];
...... 
 
cv::Mat m(256,256,CV_16S,(void *) tmp,AUTO_STEP);
 
In that case "The external data is not automatically deallocated, so you should take care of it."