4. 为什么脱机运行WiFi视频流传输，总是断网
  • OpenMV VSCode 扩展发布了，在插件市场直接搜索OpenMV就可以安装
  • 如果有产品硬件故障问题，比如无法开机，论坛很难解决。可以直接找售后维修。
  • 发帖子之前，请确认看过所有的视频教程，https://singtown.com/learn/ 和所有的上手教程http://book.openmv.cc/
  • 每一个新的提问，单独发一个新帖子
  • 帖子需要目的，你要做什么？
  • 如果涉及代码，需要报错提示与全部代码文本，请注意不要贴代码图片
  • 必看：玩转星瞳论坛了解一下图片上传，代码格式等问题。

    • 为什么脱机运行WiFi视频流传输，总是断网

    • M

      MJPEG Streaming AP.

      这个例子展示了如何在AccessPoint模式下进行MJPEG流式传输。

      Android上的Chrome，Firefox和MJpegViewer App已经过测试。

      连接到OPENMV_AP并使用此URL：http://192.168.1.1:8080查看流。

      import sensor, image, time, network, usocket, sys, math, ustruct
      from pyb import UART
      from pid import PID

      uart = UART(3,115200,bits=8, parity=None, stop=1, timeout_char = 1000)
      GRAYSCALE_THRESHOLD = [(0, 64)]
      ROIS = [ # [ROI, weight]
      (0, 100, 160, 20, 0.7),
      (0, 050, 160, 20, 0.3),
      (0, 000, 160, 20, 0.4)
      ]
      weight_sum = 0
      for r in ROIS: weight_sum += r[4]

      SSID ='OPENMV_AP' # Network SSID
      KEY ='1234567890' # wifi密码(必须为10字符)
      HOST = '' # 使用第一个可用的端口
      PORT = 8080 # 任意非特权端口

      sensor.reset()
      sensor.set_contrast(1)
      sensor.set_brightness(1)
      sensor.set_saturation(1)
      sensor.set_gainceiling(16)
      sensor.set_auto_gain(False)
      sensor.set_auto_whitebal(False)
      sensor.set_framesize(sensor.QQVGA)
      sensor.set_pixformat(sensor.GRAYSCALE)
      sensor.skip_frames(time = 2000)
      #sensor.set_vflip(True)
      #sensor.set_hmirror(True)

      wlan = network.WINC(mode=network.WINC.MODE_AP)
      wlan.start_ap(SSID, key=KEY, security=wlan.WEP, channel=2)

      def start_streaming(s):

      def sending_data(data):
    global uart;
    data = ustruct.pack("<bbb",
                   x,
                   0x0d,
                   0x0a
                   )
    uart.write(data);

print ('Waiting for connections..')
client, addr = s.accept()
# 将客户端套接字超时设置为2秒
client.settimeout(2.0)
print ('Connected to ' + addr[0] + ':' + str(addr[1]))

# 从客户端读取请求
data = client.recv(1024)
# 应该在这里解析客户端请求

# 发送多部分head
client.send("HTTP/1.1 200 OK\r\n" \
            "Server: OpenMV\r\n" \
            "Content-Type: multipart/x-mixed-replace;boundary=openmv\r\n" \
            "Cache-Control: no-cache\r\n" \
            "Pragma: no-cache\r\n\r\n")

# FPS clock
clock = time.clock()
a=0
n=0
# 开始流媒体图像
#注：禁用IDE预览以增加流式FPS。
while (True):
    if uart.any():
        a = uart.read(1)
        print(a[0])

        if a[0]==0x00:
            img = sensor.snapshot().binary(GRAYSCALE_THRESHOLD).invert()
            cframe = img.compressed(quality=35)
            header = "\r\n--openmv\r\n" \
                 "Content-Type: image/jpeg\r\n"\
                 "Content-Length:"+str(cframe.size())+"\r\n\r\n"
            client.send(header)
            client.send(cframe)
            centroid_sum = 0
            most_pixels = 5000
            for r in ROIS:
                blobs = img.find_blobs(GRAYSCALE_THRESHOLD, roi=r[0:4], merge=True)
                if blobs:
                    largest_blob = 0
                    for i in range(len(blobs)):
                        if blobs[i].pixels() > most_pixels:
                            most_pixels = blobs[i].pixels()
                            largest_blob = i
                    img.draw_rectangle(blobs[largest_blob].rect())
                    img.draw_cross(blobs[largest_blob].cx(),
                                   blobs[largest_blob].cy())
                    centroid_sum += blobs[largest_blob].cx() * r[4]
            center_pos = (centroid_sum / weight_sum)
            deflection_angle = 0
            deflection_angle = -math.atan((center_pos-80)/60)
            deflection_angle = math.degrees(deflection_angle)
            x = int(deflection_angle)
            sending_data(x)
            print("Turn Angle: %d" % deflection_angle)

        if a[0]==0x01:
            img = sensor.snapshot()
            sensor.set_pixformat(sensor.RGB565)

            cframe = img.compressed(quality=35)
            header = "\r\n--openmv\r\n" \
                 "Content-Type: image/jpeg\r\n"\
                 "Content-Length:"+str(cframe.size())+"\r\n\r\n"
            client.send(header)
            client.send(cframe)
            sensor.snapshot().save("singtown%s.jpg" % (n) )
            n +=1
            #print(n)

      while (True):
      # 创建服务器套接字
      s = usocket.socket(usocket.AF_INET, usocket.SOCK_STREAM)
      try:
      # Bind and listen
      s.bind([HOST, PORT])
      s.listen(5)

          # 设置服务器套接字超时
    # 注意：由于WINC FW bug，如果客户端断开连接，服务器套接字必须
    # 关闭并重新打开。在这里使用超时关闭并重新创建套接字。
    s.settimeout(3)
    start_streaming(s)
except OSError as e:
    s.close()
    print("socket error: ", e)
    #sys.print_exception(e)
      0