import sensor, image, time

# 初始化摄像头
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 2000)
thread=(50,255,-128,127,-128,127)
sensor.set_auto_whitebal(False)
sensor.set_contrast(5)
# 创建两个图像缓冲区last_frame是背景
current_frame = sensor.snapshot()
#last_frame = current_frame.copy()
last_update_time = 0
person=0
while(True):
    x=0
    y=0
    ry=0
    rx=0
    i=0

    # 获取当前帧并计算差分图像
    current_frame = sensor.snapshot()

    if time.time() - last_update_time > 0.5 :
        #sensor.snapshot().save("bg.bmp")
        last_frame = current_frame.copy()
        last_update_time = time.time()



    diff_frame = current_frame.difference(last_frame)

    # 对差分图像进行阈值分割和形态学操作
    threshold = (50, 255)
    binary_frame = diff_frame.to_grayscale()
    binary_frame.binary([threshold])
    binary_frame.erode(1)
    binary_frame.dilate(4)
    # 检测阈值
    ROI = (0, 0, binary_frame.width(), binary_frame.height())
    statistics=binary_frame.get_statistics(roi=ROI)
    gray_count=statistics.mean()
    #print("目标区域:", gray_count)
    if gray_count>50:
       person=1
       last_update_time = time.time()
    if gray_count<50:
       person=0
    # 进行连通性分析并绘制矩形框
    blobs = binary_frame.find_blobs([thread],area_threshold=2, pixels_threshold=2,merge=False)
    for blob in blobs:
        if blob.pixels() > 1000:
            current_frame.draw_rectangle(blob.rect())
            i=i+1
            x=x+blob.cx()
            y=y+blob.cy()

    if i>0:
        x=x/i
        y=y/i
    rx=x/binary_frame.width()
    ry=y/binary_frame.height()
    print("色块数:", i,"x:",x,"y:",y)
    print("x的相对位置",rx,"y的相对位置",ry)
    time.sleep(0.1)

```![0_1705200390750_微信图片_20240114104601.png](https://fcdn.singtown.com/12edd7d6-e462-4d79-87c4-71e39a88fad8.png)

想要对多幅图像求平均获得一个背景图像，谢谢大佬

# Untitled - By: Administrator - 周四 5月 11 2023

import sensor, image, time

sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QQVGA)
sensor.skip_frames(time = 2000)

clock = time.clock()

lastfram=None


while(True):
    clock.tick()




    img = sensor.snapshot()

    img = image.rgb_to_grayscale(img)

    img=img.binary(50)

    if lastfram is None:
      lastfram = img.copy()
      continue

    diff=image.difference(lastfram,img)

    blobs=diff.find_blobs()

    count=len(blobs)

    lastfram=img.copy()

    print(clock.fps())

求问整个程序有什么错误