求解 pan_servo.angle和tilt_servo.angle哪一个是横向转动，哪一个是纵向转动呢

[zgny]

while(True):
clock.tick() # Track elapsed milliseconds between snapshots().
img = sensor.snapshot() # Take a picture and return the image.

blobs = img.find_blobs([red_threshold])
if blobs:
    max_blob = find_max(blobs)
    pan_error = max_blob.cx()-img.width()/2
    tilt_error = max_blob.cy()-img.height()/2

    print("pan_error: ", pan_error)

    img.draw_rectangle(max_blob.rect()) # rect
    img.draw_cross(max_blob.cx(), max_blob.cy()) # cx, cy

    pan_output=pan_pid.get_pid(pan_error,1)/2
    tilt_output=tilt_pid.get_pid(tilt_error,1)
    print("pan_output",pan_output)
    pan_servo.angle(pan_servo.angle()+pan_output)
    tilt_servo.angle(tilt_servo.angle()-tilt_output)

[yuan]

Pan是云台下面的左右转动的舵机，tilt是云台上面上下转动的舵机。