4. 这是寻找最大色块的程序，电脑连上摄像头以后大部分时候识别不到，偶尔能识别到
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    • 这是寻找最大色块的程序，电脑连上摄像头以后大部分时候识别不到，偶尔能识别到

    • M

      import sensor, image, time, math
      import json
      from pyb import Pin, Timer
      #屏幕 320*240
      height = 120
      sensor.reset()
      sensor.set_pixformat(sensor.RGB565)
      sensor.set_framesize(sensor.QVGA)
      #sensor.set_windowing(320,240))
      sensor.skip_frames(time = 2000)
      sensor.set_auto_gain(False) # must be turned off for color tracking
      sensor.set_auto_whitebal(False) # must be turned off for color tracking
      clock = time.clock()
      red_block_x=1
      green_block_x=2
      blue_block_x=3

      message=000

      #lcd.init() # Initialize the lcd screen.

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

      Color Tracking Thresholds (L Min, L Max, A Min, A Max, B Min, B Max)

      The below thresholds track in general red/green/blue things. You may wish to tune them...

      thresholds = [(23, 55, 26, 64, -19, 42), # generic_red_thresholds
      (53, 74, -42, -7, -29, 2), # generic_green_thresholds
      (53, 76, -30, 40, -68, -27)] # generic_blue_thresholds
      objthresholds = [(61, 86, 11, 44, -33, 0), # generic_red_thresholds
      (34, 97, -11, -46, -52, 40), # generic_green_thresholds
      (69, 51, 5, 44, -29, -50)] # generic_blue_thresholds

      graythreshold=[(100,255)]

      K=5000
      while(True):

      clock.tick()

light = Timer(2, freq=1800).channel(1, Timer.PWM, pin=Pin("P6"))#ferq=50000
light.pulse_width_percent(2)#30
if(C_led):
    light.pulse_width_percent(2)#30
# 控制亮度 0~100##############################################
CS_flag=1

img = sensor.snapshot()

if(CS_flag):
    #light = Timer(2, freq=1800).channel(1, Timer.PWM, pin=Pin("P6"))#ferq=50000
    #light.pulse_width_percent(2)#30
    clock.tick() # Track elapsed milliseconds between snapshots().
    img = sensor.snapshot() # Take a picture and return the image.
    blobs = img.find_blobs([thresholds[0],thresholds[1],thresholds[2]],x_stride=40,y_stride=40,pixels_threshold=1000)
    if blobs:
        data=[]
        max_blob = find_max(blobs)
        img.draw_cross(max_blob.cx(),max_blob.cy())
        img.draw_circle(max_blob.cx(),max_blob.cy(),max_blob.cx()-max_blob.x(), color = (255, 255, 255))
        X =int(max_blob.cx()-img.width()/2)
        Y =int(max_blob.cy()-img.height()/2)
        data.append((X,Y))
        data_out = json.dumps(set(data))
        uart.write('CS'+data_out +"\r\n")
        print(data_out)
        print("偏移坐标 : ",X, Y)
        #print("Y轴偏移坐标 : ",Y)
        #print("帧率 : ",clock.fps())
        CS_flag = 0
      0