1、Mat矩陣值傳遞的時候,如果在函數內部類型發生改變時候,傳出來的數據會變化,所以需要在函數內部重新複製一塊區域給他,才能傳出想要的Mat
void getDes(Mat& des)
{
temp = Mat(10,10,CV_32FC1);
temp.copyTo(des);
}
void main()
{
Mat descriptor;
getDes(descriptor);
}
2、使用colRange()和rowRange()對矩陣進行擴充(https://blog.csdn.net/mikedadong/article/details/51305640)
Mat comMatR(Mat Matrix1,Mat Matrix2,Mat &);//函數聲明
Mat comMatC(Mat Matrix1,Mat Matrix2,Mat &);//函數聲明
//comMatR(conbine matrix as row):combine Matrix1 and Matrix2 to MatrixCom as row ,just as the matlab expression :MatrixCom=[Matrix1 Matrix1]
Mat comMatR(Mat Matrix1,Mat Matrix2,Mat &MatrixCom)
{
CV_Assert(Matrix1.rows==Matrix2.rows);//行數不相等,出現錯誤中斷
MatrixCom.create(Matrix1.rows,Matrix1.cols+Matrix2.cols,Matrix1.type());
Mat temp=MatrixCom.colRange(0,Matrix1.cols);
Matrix1.copyTo(temp);
Mat temp1=MatrixCom.colRange(Matrix1.cols,Matrix1.cols+Matrix2.cols);
Matrix2.copyTo(temp1);
return MatrixCom;
}
//comMatR(conbine matrix as col):combine Matrix1 and Matrix2 to MatrixCom as rows ,just as the matlab expression :MatrixCom=[Matrix1;Matrix1]
Mat comMatC(Mat Matrix1,Mat Matrix2,Mat &MatrixCom)
{
CV_Assert(Matrix1.cols==Matrix2.cols);//列數不相等,出現錯誤中斷
MatrixCom.create(Matrix1.rows+Matrix2.rows,Matrix1.cols,Matrix1.type());
Mat temp=MatrixCom.rowRange(0,Matrix1.rows);
Matrix1.copyTo(temp);
Mat temp1=MatrixCom.rowRange(Matrix1.rows,Matrix1.rows+Matrix2.rows);
Matrix2.copyTo(temp1);
return MatrixCom;
}