Opencv中面积检测相关问题

有没有opencv大神帮忙看看这个是什么情况？
为什么面积检测后会出来两组数据，分不清楚了
谢谢

# -*- coding: cp936 -*-
import cv2
import numpy as np
#import matplotlib.pyplot as plt

img = cv2.imread('22.jpg')
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
blur = cv2.GaussianBlur(gray,(5,5),0)
thresh = cv2.adaptiveThreshold(blur,225,1,1,11,2)

contours,hierarchy = cv2.findContours(thresh,cv2.RETR_LIST,cv2.CHAIN_APPROX_SIMPLE)

Area = []

for cnt in contours:
    if cv2.contourArea(cnt)>50:   #计算出轮廓面积>50
        [x,y,w,h] = cv2.boundingRect(cnt)   #包含轮廓的正方框，得到坐标
        if  h>28:
            #cv2.rectangle(img,(x,y),(x+w,y+h),(0,255,0),2)  #绘制出轮廓的方框
            string = str(cv2.contourArea(cnt))
            cv2.putText(img,string,(x,y+100),0,1,(0,255,0))
            print w,h


cv2.imshow('im',img)
cv2.waitKey(0)