OPENMV4固件版本4.0.2就没办法用letnet数字识别了吗？文档里只有说3.6.5固件版本之前的，和openmv4 plus

import sensor, image, time
from pyb import UART
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QQVGA)
sensor.skip_frames(time = 2000)
clock = time.clock()
sensor.set_auto_gain(False)
sensor.set_auto_whitebal(False)
sensor.set_windowing((10,0,130,120))
color_threshold   =(71, 100, -10, 10, -21, 24)
uart=UART(3,115200)
def find_max(blobs):
    max_size=0
    for blob in blobs:
        if blob[2]*blob[3] > max_size:
            max_blob=blob
            max_size = blob[2]*blob[3]
    return max_blob
while(True):
    clock.tick()
    img = sensor.snapshot().lens_corr(1.8)
    blobs = img.find_blobs([color_threshold],area_threshold=50,pixels_threshold=50)
    #blobs = img.find_blobs([color_threshold])
    if blobs:
        max_blob = find_max(blobs)
        img.draw_rectangle(max_blob.rect())
        img.draw_cross(max_blob.cx(),max_blob.cy())
        uart.write("x:%03d,y:%03d\r\n"%(max_blob.cx(),max_blob.cy()))
        print("x:%03d,y:%03d\r\n"%(max_blob.cx(),max_blob.cy()))
    print(clock.fps())

OPENMV4 H7 ov7725
固件版本4.0.2

import sensor, image, time
from pyb import UART
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QQVGA)
sensor.skip_frames(time = 2000)
clock = time.clock()
sensor.set_auto_gain(False)
sensor.set_auto_whitebal(False)
sensor.set_windowing((10,0,130,120))
color_threshold   =(71, 100, -10, 10, -21, 24)
uart=UART(3,115200)
def find_max(blobs):
    max_size=0
    for blob in blobs:
        if blob[2]*blob[3] > max_size:
            max_blob=blob
            max_size = blob[2]*blob[3]
    return max_blob
while(True):
    clock.tick()
    img = sensor.snapshot().lens_corr(1.8)
    blobs = img.find_blobs([color_threshold],area_threshold=50,pixels_threshold=50)
    #blobs = img.find_blobs([color_threshold])
    if blobs:
        max_blob = find_max(blobs)
        img.draw_rectangle(max_blob.rect())
        img.draw_cross(max_blob.cx(),max_blob.cy())
        uart.write("x:%03d,y:%03d\r\n"%(max_blob.cx(),max_blob.cy()))
        print("x:%03d,y:%03d\r\n"%(max_blob.cx(),max_blob.cy()))
    print(clock.fps())

OPENMV4 H7 ov7725
固件版本4.0.2

识别颜色代码，用IDE运行程序时有40FPS,脱机运行是OPENMV帧率明显降低，传输出来的数据变慢，并且使用IDE运行程序时，运行一段时间会自动降低到19.2FPS,仅仅是一个简单的识别颜色的程序，降低过分辨率没有任何变化，找其他同学的OPENMV过来运行相同的代码，有的同学的OPENMV甚至只能19.2fps