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运行halloworld的时候图像颜色很怪异，不知道是什么问题，求大神解答

想要设置SPI2的时钟频率为18000000应该怎么写呢？

@kidswong999 谢谢

import sensor, image, time

sensor.reset()
sensor.set_pixformat(sensor.GRAYSCALE)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 2000)
sensor.set_auto_whitebal(False)

clock = time.clock()

while(True):
    clock.tick()
    img = sensor.snapshot().lens_corr(1.8)
    thr = img.histogram().get_threshold()
#    print('threshold',thr[0])
#    img.binary([(thr[0],255)])
    img = img.binary([(0,thr[0])])
    blob0 = img.find_blobs([(255,255)],pixel_threshold = 4000)
    print(blob0)
    lin = img.get_regression([(thr[0],255)], roi = (70,0,180,240))
#    if (blob0):
#    img.draw_rectangle((277, 0, 43, 69), color = 127)
    if (lin):
         img.draw_line(lin.line(), color = 127)
         print(lin)

识别到的图像如下:

打印出来的结果如下：
[{"x":100, "y":0, "w":85, "h":240, "pixels":16918, "cx":146, "cy":112, "rotation":1.518160, "code":1, "count":1, "perimeter":744, "roundness":0.091413},
{"x":268, "y":0, "w":52, "h":69, "pixels":2353, "cx":300, "cy":28, "rotation":1.209709, "code":1, "count":1, "perimeter":375, "roundness":0.503028},
{"x":315, "y":69, "w":5, "h":3, "pixels":10, "cx":318, "cy":70, "rotation":2.727168, "code":1, "count":1, "perimeter":10, "roundness":0.332269},
{"x":181, "y":83, "w":2, "h":21, "pixels":35, "cx":182, "cy":93, "rotation":1.556911, "code":1, "count":1, "perimeter":42, "roundness":0.014494}]
{"x1":140, "y1":0, "x2":153, "y2":239, "length":239, "magnitude":2, "theta":177, "rho":-140}
[{"x":100, "y":0, "w":85, "h":240, "pixels":16919, "cx":146, "cy":112, "rotation":1.517971, "code":1, "count":1, "perimeter":741, "roundness":0.091471},
{"x":268, "y":0, "w":52, "h":69, "pixels":2317, "cx":300, "cy":27, "rotation":1.202760, "code":1, "count":1, "perimeter":418, "roundness":0.512365},
{"x":181, "y":83, "w":2, "h":20, "pixels":33, "cx":182, "cy":92, "rotation":1.562700, "code":1, "count":1, "perimeter":40, "roundness":0.015920}]
{"x1":140, "y1":0, "x2":153, "y2":239, "length":239, "magnitude":2, "theta":177, "rho":-140}

非常感谢各路大神指导