开机一段时间后摄像头捕捉到的画面色彩突然变得鲜艳 重新开机又变得暗淡

[snu3]

为什么在摄像头捕捉到的画面中 两张颜色的鲜艳度差的这么多
代码没更改过 期间只更换过小球

摄像头开一段时间之后颜色就变得鲜艳 重新启动后又变得暗淡

import sensor, image, time

sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QQVGA)
sensor.skip_frames(time = 2000)
sensor.set_auto_gain(False) # must be turned off for color tracking
sensor.set_auto_whitebal(False) # must be turned off for color tracking
clock = time.clock()
while(True):
    clock.tick()
    img = sensor.snapshot().lens_corr(1.8)
    for c in img.find_circles(threshold = 1050, x_margin = 10, y_margin = 10, r_margin = 40,
            r_min = 50, r_max = 200, r_step = 10):
        area = (c.x()-c.r(), c.y()-c.r(), c.r(), c.r())
        #img.draw_circle(c.x(), c.y(), c.r(), color = (255, 0, 0))#识别到的红色圆形用红色的圆框出来
        #area为识别到的圆的区域，即圆的外接矩形框
        statistics = img.get_statistics(roi=area)#像素颜色统计
        print(statistics)
        #(0,100,0,120,0,120)是红色的阈值，所以当区域内的众数（也就是最多的颜色），范围在这个阈值内，就说明是红色的圆。
        #l_mode()，a_mode()，b_mode()是L通道，A通道，B通道的众数。
        if 0<statistics.l_min()<10 and 10<statistics.a_mode()<30 and -20<statistics.b_mode()<5:#if the circle is pink
            img.draw_circle(c.x(), c.y(), c.r(), color = (255,0,255))#识别到的粉色圆形用红色的圆框出来
        elif 0<statistics.l_min()<20 and -5<statistics.a_mode()<5 and -2<statistics.b_mode()<2:#if the circle is white
            img.draw_circle(c.x(), c.y(), c.r(), color = (255, 255, 255))#识别到的白色圆形用白色的圆框出来
        elif 0<statistics.l_mode()<20 and -20<statistics.a_mode()<40 and -60<statistics.b_mode()<35:#if the circle is white
            img.draw_circle(c.x(), c.y(), c.r(), color = (0, 0, 255))#识别到的白色圆形用白色的圆框出来
    #print("FPS %f" % clock.fps())

[snu3]

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