在这里有一个错误不知道怎么改急急急求指教

[wt4q]

import sensor, image, time, math, pyb

from pyb import UART

led = pyb.LED(3)

sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QQVGA)
sensor.skip_frames(10)
sensor.set_auto_whitebal(False)
clock = time.clock()

uart = UART(3, 19200)

k=4480

size_threshold = 2000

red_threshold = (73, 100, 44, -62, -51, 53)
green_threshold = (0, 69, -128, -19, -128, 114)

flag_get = 0

def find_max(blobs):
    max_size=0
    for blob in blobs:
        if blob[2]*blob[3] > max_size:
            max_blob = blob
            max_size = blob[2]*blob[3]
    return max_blob

while(True):
    clock.tick()
    img = sensor.snapshot()
    if uart.any():
	   flag_get = uart.readchar()
     if flag_get == 0x6E:
       blobs = img.find_blobs([green_threshold],pixels_threshold=200, area_threshold=200,merge=True)
       if len(blobs)==1:
        max_blob = find_max(blobs)
        img.draw_rectangle(max_blob[0:4])
        img.draw_cross(max_blob[5],max_blob[6])
        LM = (max_blob[2]+max_blob[3])/2
        length = k/LM
        if length < 60:
          print(length)
          uart.write("i")
	 led.on()
     time.sleep(150)
     led.off()
     time.sleep(100)

[kidswong999]

缩进不对。