pip install opencv-contrib-python
pip install numpy
pip install pandas

python main.py

x = [x_postition, x_velocity, y_position, y_velocity]

    self.dt = dt                            # time interval
    self.A = np.array([                     # system matrix
        [1, dt, 0,  0],
        [0,  1, 0,  0],
        [0,  0, 1, dt],
        [0,  0, 0,  1],
    ], dtype=np.float)
    self.H = np.array([                     # system matrix
        [1, 0, 0, 0],
        [0, 0, 1, 0]
    ])
    self.Q = 0.9*np.eye(4, dtype=np.float)  # system error matrix
    self.R = np.array([                     # measurement error matrix
        [100, 0],
        [0, 100]
    ], dtype=np.float)