open mv二维码识别有时候识别不出来什么原因

ID:836780 · 发表于 2021-12-22 19:09

import sensor, image,time,lcd, math
from pyb import UART,Timer,LED

threshold_index = 0 # 0 for red, 1 for green, 2 for blue

thresholds1 = [(65, 94, -63, -29, -14, 27)] # 黑色阈值

thresholds = [(8, 66, 21, 79, 3, 62), # 红色
            (30, 100, -64, -8, -32, 32), #
            (96, 100, -15, -3, -14, 43)] #
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 2000)
sensor.set_auto_gain(False)
sensor.set_auto_whitebal(False)
clock = time.clock()
data = []
uart = UART(3,115200,8,None,1)    #创建串口对象

while(True):
  img = sensor.snapshot()    #保持一张照片
  for blob1 in img.find_blobs(thresholds1,roi= [0,0,318,145], pixels_threshold=300, area_threshold=200):
   b=blob1.x()-150
   d=blob1.x()+70
   e=blob1.y()+50
   print(d)
   print(e) #通过坐标得到一块识别区域
  if(uart.any()): #判断是否有串口信息过来
   data = uart.read(8)  #读8位数据
   if((data[0] == 0x55)&(data[1] == 0x02)&(data[7] == 0xBB)):
   print("4")
   if(data[2] == 0x92 and data[3] == 0x01 ):  #红绿灯
      for blob in img.find_blobs(thresholds,roi= [0,0,d,e], pixels_threshold=300, area_threshold=200):
            print( blob.code())
            if blob.code()==1 or blob.code()==4: #因为红色与黄色总是识别成一样的所以用坐标判断
               print("5")
               if blob.x()<b:  #红色
                  uart.writechar(0x55)
                  uart.writechar(0x02)
                  uart.writechar(0x92)
                  uart.writechar(0x01)
                  uart.writechar(0x01)
                  uart.writechar(0x01)
                  uart.writechar(0x00)
                  uart.writechar(0xBB)
                  print("红色")
               if blob.x()>b: #黄色
                  # qr_Tab = code.payload()
                  uart.writechar(0x55)
                  uart.writechar(0x02)
                  uart.writechar(0x92)
                  uart.writechar(0x01)
                  uart.writechar(0x01)
                  uart.writechar(0x03)
                  uart.writechar(0x00)
                  uart.writechar(0xBB)
                  print("黄色")
            if blob.code()!=1 or blob.code()!=4:#绿色
               # qr_Tab = code.payload()
                  uart.writechar(0x55)
                  uart.writechar(0x02)
                  uart.writechar(0x92)
                  uart.writechar(0x01)
                  uart.writechar(0x01)
                  uart.writechar(0x02)
                  uart.writechar(0x00)
                  uart.writechar(0xBB)
                  print("绿色")
      if(data[2] == 0x92 and data[3] == 0x02 ):  #二维码
               print("二维码")
               for code in img.find_qrcodes():  #这是一个二维码功能函数    uart.writechar是串口发送数据的
                  time.sleep(100)
                  qr_Tab = code.payload()
                  uart.writechar(0x55)
                  uart.writechar(0x02)
                  uart.writechar(0x89)
                  uart.writechar(0x01)
                  uart.writechar(len(qr_Tab))
                  for qrdata in qr_Tab:
                        uart.writechar(ord(qrdata))
                  uart.writechar(0xBB)
                  print("6")

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