from PIL import Image
import itertools
img = Image.open('C:/img.jpg').convert('L') #打開(kāi)圖片,convert圖像類(lèi)型有L,RGBA

# 轉(zhuǎn)化為黑白圖
def blackWrite(img):
 blackXY = []

 # 遍歷像素點(diǎn)
 for x in range(img.size[0]):
  for y in range(img.size[1]):
   print img.getpixel((x,y))
   if img.getpixel((x,y))<128:
    img.putpixel((x,y),0) # 置為黑點(diǎn)
    blackXY.append((x,y))
   else:
    img.putpixel((x,y),255) # 置為白點(diǎn)
 return blackXY


# 去除干擾點(diǎn)
def clrImg(img,pointArr):
 # 獲取周?chē)邳c(diǎn)的個(gè)數(shù)
 def getN(p):
  count = 0
  x = [p[0]-1,p[0],p[0]+1]
  y = [p[1]-1,p[1],p[1]+1]
  for i in itertools.product(x,y): # 笛卡爾積
   try:
    if img.getpixel(i) == 0:
     count +=1
   except:
    print 'out of'
    continue
  print count
  return count

 for p in pointArr:
  if getN(p)<5: # 周?chē)邳c(diǎn)個(gè)數(shù) <5 的黑點(diǎn)認(rèn)為是干擾點(diǎn),置為白點(diǎn)
   img.putpixel(p,255)
   
pointArr = blackWrite(img)
clrImg(img,pointArr)
img.save("C:/img_1.jpg")