执行会报错 OSError: Image format is not supported! 是图像格式还是在VGA 格式，没有回到QQVGA吗？
import sensor, image, time,pyb
def find_max(blobs): #寻找最大色块函数定义
max_pixels=0 #通过像素比较
for blob in blobs: #blob[0,1，2，3，4]=x,y,w,h,pixels (int)
if blob[4]>max_pixels:
max_blob=blob
max_pixels=blob[4]
return max_blob
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 2000)
clock = time.clock()
yellow= (44, 99, -47, 19, 28, 92)
while(True):
clock.tick()
img = sensor.snapshot()
blobs = img.find_blobs([yellow],area_threshold=50, pixels_threshold=50,margin = 1)
if blobs:
max_blob=find_max(blobs)
print(max_blob[5],max_blob[6],max_blob.rotation())
img.draw_rectangle(max_blob.rect(),color = (255,0,0))
img.draw_cross(max_blob.cx(),max_blob.cy())
sensor.set_framesize(sensor.VGA)
img = sensor.snapshot()
img.save("example4.jpg")
pyb.delay(500)
sensor.set_framesize(sensor.QQVGA)
print("11111")
pyb.delay(500)
sensor.set_framesize(sensor.QQVGA)
print("22222")
pyb.delay(500)
