How to detect the contour from any source data.

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C++

QT

Hello everyone. Now days i am working on how to detect the contours from my source data.
So in order to to this i am using openCV library, but when i run the program it gives me error. You can see What i tried in bellow. I do not understand why is this function giving error. Any help would be appreciated.

What I have tried:

void Contour::contourDetection( int nWidth, int nHeight, const QVector< float >& data )
{
 QVector< float > tData = data;
 Mat gray;
 Mat image( nHeight, nWidth, CV_16UC1, tData.data() );
	
 cvtColor( image, gray, CV_BGR2GRAY ); //Error is here ( "There is an unhandled exception." )
 Canny( gray, gray, 100, 200, 3 );
 
 vector< vector< Point > > contours;
 vector< Vec4i > hierarchy;
 RNG rng( 12345 );

 findContours( gray, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, Point( 0, 0 ) );

}