pip install numpy-1.13.1+mkl-cp36-cp36m-win_amd64.whl
pip install opencv_python-3.3.1-cp36-cp36m-win_amd64.whl

import cv2
import numpy as np

img=cv2.imread('timg.jpg')
#缩放
rows,cols,channels = img.shape
img=cv2.resize(img,None,fx=0.5,fy=0.5)
rows,cols,channels = img.shape
cv2.imshow('img',img)

#转换hsv
hsv=cv2.cvtColor(img,cv2.COLOR_BGR2HSV)
lower_blue=np.array([90,70,70])
upper_blue=np.array([110,255,255])
mask = cv2.inRange(hsv, lower_blue, upper_blue)
cv2.imshow('Mask', mask)

#腐蚀膨胀
erode=cv2.erode(mask,None,iterations=1)
cv2.imshow('erode',erode)
dilate=cv2.dilate(erode,None,iterations=1)
cv2.imshow('dilate',dilate)

#遍历替换
for i in range(rows):
  for j in range(cols):
    if dilate[i,j]==255:
      img[i,j]=(0,0,255)#此处替换颜色，为BGR通道
cv2.imshow('res',img)

cv2.waitKey(0)
cv2.destroyAllWindows()