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  • 测距时的Lm是什么意思?



    • 0_1565187964268_2699e9e6-e6c9-4efc-baa3-6c33b0cf0ae3-image.png 这里用颜色来测距时,Lm是什么意思,实际长度?那例程中的length也是实际长度啊,Lm=色块长加宽除以2又是什么意思呀?

      # 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   = ( 56,   83,    5,   57,   63,   80)
      # 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.QQVGA) # use QQVGA for speed.
      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])
          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.