python height_measurement_modify.py filename reference_height
for example, python height_measurement_modify.py df.jpg 205.0
And you need to draw 14 points, 1-4 points are used to draw a couple x axis parrel lines, 4-8 points, y axis parrel lines, thoes points are used to calculate the vanishing line. And 9,10 points are the reference object line in z axis, 11,12 points are the parrel line in z axis, 13,14 points are the object to be measured.