python检查行人轨迹是否为下蹲动作的简化函数

def check_isdown(cfg, trajectory)
	isdown = False
	rect = trajectory["rect"][0]
	h1max = 0
	h2max = 0
	value = 2
	s1 = 0
	s2 = 0
	for i in range(1, len(trajectory["rects"])):
		rect = trajectory["rects"][i]
		if rect[3] < 0.5 and rect[3] > h1max:
			s1 = (rect[3]-rect[1])*(rect[2]-rect[0])
			h1max = rect[3]
		if rect[3] > 0.5 and rect[3] > h2max:
			s21 = (rect[3]-rect[1])*(rect[2]-rect[0])
			h2max = rect[3]
		if s1 != 0:
			value = s2/s1
		if value < 1.2 and value != 0:
			isdown = True
		return isdown	
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