<div class="geetest_canvas_img geetest_absolute" style="display: block;">
<div class="geetest_slicebg geetest_absolute">
	<canvas class="geetest_canvas_bg geetest_absolute" height="160" width="260"></canvas>
	<canvas class="geetest_canvas_slice geetest_absolute" width="260" height="160"></canvas>
</div>
<canvas class="geetest_canvas_fullbg geetest_fade geetest_absolute" height="160" width="260" style="display: none;"></canvas>
</div>

class VeriImageUtil():

 def __init__(self):
  self.defaultConfig = {
   "grayOffset": 20,
   "opaque": 1,
   "minVerticalLineCount": 30
  }
  self.config = copy.deepcopy(self.defaultConfig)

 def updateConfig(self, config):
  # temp = copy.deepcopy(config)
  for k in self.config:
   if k in config.keys():
    self.config[k] = config[k]

 def getMaxOffset(self, *args):
  # 计算偏移平均值最大的数
  av = sum(args) / len(args)

  maxOffset = 0
  for a in args:
   offset = abs(av - a)
   if offset > maxOffset:
    maxOffset = offset
  return maxOffset

 def isGrayPx(self, r, g, b):
  # 是否是灰度像素点，允许波动offset
  return self.getMaxOffset(r, g, b) < self.config["grayOffset"]

 def isDarkStyle(self, r, g, b):
  # 灰暗风格
  return r < 128 and g < 128 and b < 128

 def isOpaque(self, px):
  # 不透明
  return px[3] >= 255 * self.config["opaque"]

 def getVerticalLineOffsetX(self, bgImage):
  # bgImage = Image.open("./image/bg.png")
  # bgImage.im.mode = 'RGBA'
  bgBytes = bgImage.load()

  x = 0
  while x < bgImage.size[0]:
   y = 0
   # 点》》线，灰度线条数量
   verticalLineCount = 0
   if x == 258:
    print(y)
   while y < bgImage.size[1]:
    px = bgBytes[x, y]
    r = px[0]
    g = px[1]
    b = px[2]
    # alph = px[3]
    # print(px)
    if self.isDarkStyle(r, g, b) and self.isGrayPx(r, g, b) and self.isOpaque(px):
     verticalLineCount += 1
    else:
     verticalLineCount = 0
     y += 1
     continue

    if verticalLineCount >= self.config["minVerticalLineCount"]:
     # 连续多个像素都是灰度像素，直线
     # print(x, y)
     return x

    y += 1

   x += 1
  pass


if __name__ == '__main__':
 bgImage = Image.open("./image/bg.png")
 veriImageUtil = VeriImageUtil()

 # veriImageUtil.updateConfig({
 #  "grayOffset": 20,
 #  "opaque": 0.6,
 #  "minVerticalLineCount": 10
 # })
  bgOffsetX = veriImageUtil.getVerticalLineOffsetX(bgImage)
 print("bgOffsetX:{} ".format(bgOffsetX))