1. pkg-config can't find opencv

    pkg-config can't find opencv

  2. OpenCV Point(x,y) represent (column,row) or (row,column)

    OpenCV Point(x,y) represent (column,row) or (row,column)

  3. Opencv multiply scalar and matrix

    Opencv multiply scalar and matrix

  4. install opencv into a virtual environment

    install opencv into a virtual environment