python环境下OPenCV处理视频流局部区域像素值

# -*- coding:utf-8 -*-
import cv2
import numpy as np
camera = cv2.VideoCapture(0) # 参数0表示第一个摄像头
# camera = cv2.VideoCapture("test.avi") # 从文件读取视频
# 判断视频是否打开
if (camera.isOpened()):
 print 'Open'
else:
 print 'Fail to open!'
# # 测试用,查看视频size
# size = (int(camera.get(cv2.CAP_PROP_FRAME_WIDTH)),
#  int(camera.get(cv2.CAP_PROP_FRAME_HEIGHT)))
# print 'size:'+repr(size)
rectangleCols = 30
while True:
 grabbed, frame_lwpCV = camera.read() # 逐帧采集视频流
 if not grabbed:
  break
 gray_lwpCV = cv2.cvtColor(frame_lwpCV, cv2.COLOR_BGR2GRAY) # 转灰度图
 frame_data = np.array(gray_lwpCV)  # 每一帧循环存入数组
 box_data = frame_data[:, 400:400+rectangleCols] # 取矩形目标区域
 pixel_sum = np.sum(box_data, axis=1) # 行求和q
 length = len(gray_lwpCV)
 x = range(length)
 emptyImage = np.zeros((rectangleCols*10, length*2, 3), np.uint8)
 for i in x:
  cv2.rectangle(emptyImage, (i*2, (rectangleCols-pixel_sum[i]/255)*10), ((i+1)*2, rectangleCols*10), (255, 0, 0), 1)
 emptyImage = cv2.resize(emptyImage, (320, 240))
 # 画目标区域
 lwpCV_box = cv2.rectangle(frame_lwpCV, (400, 0), (430, length), (0, 255, 0), 2)
 cv2.imshow('lwpCVWindow', frame_lwpCV) # 显示采集到的视频流
 cv2.imshow('sum', emptyImage)  # 显示画出的条形图
 key = cv2.waitKey(1) & 0xFF
 if key == ord('q'):
  break
camera.release()
cv2.destroyAllWindows()