openmv红绿蓝色环识别

可以使用OpenMV的颜色追踪功能来识别红绿蓝色环。首先，需要使用OpenMV的IDE将颜色追踪代码烧录到OpenMV板子上。然后，可以使用以下代码来识别红绿蓝色环：

import sensor, image, time

red_threshold = (30, 100, 15, 127, 15, 127) # 红色阈值
green_threshold = (30, 100, -64, -8, -32, 32) # 绿色阈值
blue_threshold = (0, 30, 0, 64, -128, 0) # 蓝色阈值

sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 2000)

while(True):
    img = sensor.snapshot()
    blobs_red = img.find_blobs([red_threshold])
    blobs_green = img.find_blobs([green_threshold])
    blobs_blue = img.find_blobs([blue_threshold])
    if blobs_red:
        for b in blobs_red:
            img.draw_rectangle(b.rect())
            img.draw_cross(b.cx(), b.cy())
    if blobs_green:
        for b in blobs_green:
            img.draw_rectangle(b.rect())
            img.draw_cross(b.cx(), b.cy())
    if blobs_blue:
        for b in blobs_blue:
            img.draw_rectangle(b.rect())
            img.draw_cross(b.cx(), b.cy())
    print("红色环数量：", len(blobs_red))
    print("绿色环数量：", len(blobs_green))
    print("蓝色环数量：", len(blobs_blue))