lehz 发布的帖子

你的目标值和测量值都代表什么意思？
目标值是期望值吗？

openmv能远程升级main代码吗？非常关注这个问题。

usb电缆连接至计算机，测量3.3v无电压，测量vin管脚为1.8v

OpenMV变砖了，无法DFU升级,计算机也没有发现新端口。这个好像是坏的很彻底。怎么办？返厂维修费用大概是多少啊？返厂地址是什么？

在淘宝网上有一个透明保护壳，当我买了openmv4 h7 plus套件时，打开了包裹，发现透明保护壳不在包裹中

而客服表示，保护壳没有写在list的单子上。但那个保护壳却一直在照片里。怎么说？

@kidswong999
感谢回复。

没有改动程序。没有错误。不知道是不是以后还会抽筋。

硬件为OpenMV4 H7 PLUS

ide 3.0.3，windows7 ，openmv4 H7

# Measure the distance
#
# This example shows off how to measure the distance through the size in imgage
# This example in particular looks for yellow pingpong ball.

import sensor, image, time

# For color tracking to work really well you should ideally be in a very, very,
# very, controlled enviroment where the lighting is constant...
yellow_threshold   = (2, 85, -128, 127, 18, 64)
# You may need to tweak the above settings for tracking green things...
# Select an area in the Framebuffer to copy the color settings.

sensor.reset() # Initialize the camera sensor.
sensor.set_pixformat(sensor.RGB565) # use RGB565.
sensor.set_framesize(sensor.FHD) #【ov5640】
sensor.skip_frames(10) # Let new settings take affect.
sensor.set_auto_whitebal(False) # turn this off.
clock = time.clock() # Tracks FPS.

K=5000#the value should be measured

while(True):
    clock.tick() # Track elapsed milliseconds between snapshots().
    img = sensor.snapshot() # Take a picture and return the image.

    blobs = img.find_blobs([yellow_threshold], x_stride=2, y_stride=1)
    if len(blobs) == 1:
        # Draw a rect around the blob.
        b = blobs[0]
        img.draw_rectangle(b[0:4]) # rect
        img.draw_cross(b[5], b[6]) # cx, cy
        Lm = (b[2]+b[3])/2
        length = K/Lm
        print(length)

    #print(clock.fps()) # Note: Your OpenMV Cam runs about half as fast while
    # connected to your computer. The FPS should increase once disconnected.

以为是内容的问题，插入了sd新卡，仍旧报错。
请大佬不吝指点。谢谢