k210寻找颜色

import sensor
import image
import lcd
import time
lcd.init()
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.run(1)
green_threshold   = (0,   80,  -70,   -10,   -0,   30)
while True:
    img=sensor.snapshot()
    blobs = img.find_blobs([green_threshold])
    if blobs:
        img.draw_string(60, 100, "green", scale=4) 
    lcd.display(img)