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这个b和c应该怎么修改呢，麻烦请教一下

import sensor, image, time
import time
from pyb import UART
from modbus import ModbusRTU
uart = UART(3,115200, parity=None, stop=2, timeout=1, timeout_char=4)
modbus = ModbusRTU(uart,slave_id=2,register_num=9999)
threshold   = (30, 100, 15, 127, 15, 127)
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QQVGA)
sensor.skip_frames(10)
sensor.set_auto_whitebal(False)
sensor.set_auto_gain(False)
clock = time.clock()
while(True):
    clock.tick()
    img = sensor.snapshot().lens_corr(1.8)
    img = sensor.snapshot()
    for c in img.find_circles(threshold = 3500, x_margin = 10, y_margin = 10, r_margin = 10,r_min = 2, r_max = 100, r_step = 2):
        img.draw_circle(c.x(), c.y(), c.r(), color = (255, 0, 0))
        circles = img.find_circles()
        print("***************************数据由此开始更新***************************************")
        print("X坐标：",c.x(),"Y坐标：",c.y(),"半径：",c.r())
        print(len(circles),"个")
    blobs = img.find_blobs([threshold], pixels_threshold=100, area_threshold=100)
    if blobs:
        for b in blobs:
            img.draw_rectangle(b[0:4])
            img.draw_cross(b[5], b[6])
            print("X坐标：",b[5],"Y坐标：",b[6])
            print(len(blobs),"个")
            print("X方向相差距离：",c.x()-b[5],"Y方向相差距离：",b[6]- c.y())
            print("***************************数据由此开始结束**********************************")
    if modbus.any():
            modbus.handle(debug=True)
    else:
            modbus.REGISTER[0] = c.x()- b[5]
            modbus.REGISTER[1] = b[6]- c.y()