4. 色块寻找？求没找到色块发送个0？
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    • 色块寻找？求没找到色块发送个0？

    • Y
       

      # Single Color RGB565 Blob Tracking Example
#
# This example shows off single color RGB565 tracking using the OpenMV Cam.

import sensor, image, time, math

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 = [(30, 100, 30, 127, -40, 60), # generic_red_thresholds
              (15, 40, -10, 40, -50, 20), # generic_block_thresholds
              (60, 80, 0, 64, -10,40)] # generic_blue_thresholds


sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 1000)
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()

# Only blobs that with more pixels than "pixel_threshold" and more area than "area_threshold" are
# returned by "find_blobs" below. Change "pixels_threshold" and "area_threshold" if you change the
# camera resolution. "merge=True" merges all overlapping blobs in the image.

while(True):
    clock.tick()
    img = sensor.snapshot()
    for blob in img.find_blobs([thresholds[threshold_index]], pixels_threshold=400, area_threshold=500, merge=True):
        # These values depend on the blob not being circular - otherwise they will be shaky.
        if blob.elongation() > 0.5:
            img.draw_edges(blob.min_corners(), color=(255,0,0))
            img.draw_line(blob.major_axis_line(), color=(0,255,0))
            img.draw_line(blob.minor_axis_line(), color=(0,0,255))
        # These values are stable all the time.
        img.draw_rectangle(blob.rect())
        img.draw_cross(blob.cx(), blob.cy())
        # Note - the blob rotation is unique to 0-180 only.
        img.draw_keypoints([(blob.cx(), blob.cy(), int(math.degrees(blob.rotation())))], size=20)

    try:
        print(threshold_index,blob[4])
    except NameError:
        print(1)
    threshold_index=threshold_index+1
    if threshold_index>1:
        threshold_index=0

      我是多色块寻找，返回色块颜色和大小，但是blob【4】这个变量无法更改，更改就报错，我试过del blob也没用，
      try函数是第一次没找到报错用的！
      最后效果想的是如果没找到色块，返回个0就好
      求大佬帮助啊

      0 

    • blobs = img.find_blobs()
if blobs:
    for blob in blobs:
        xxxx
else:
    print(0)
      0