只是有时会出现报错，有时不会
硬件是Openmv m3

Blob Detection and uart transport

import sensor, image, time
from pyb import UART
import json

For color tracking to work really well you should ideally be in a very, very,

very, controlled enviroment where the lighting is constant...

#red_threshold = (32, 77, -69, 96, 19, 64)
#green_threshold = (9, 100, -22, -83, 11, 125)
#blue_threshold = (27, 95, -43, 18, -7, -72)

red_threshold = (96, 12, 26, 103, 64, -114)
green_threshold = (100, 3, -13, -66, 49, -29)
blue_threshold = (100, 0, 70, -80, -65, -4)

You may need to tweak the above settings for tracking green things...

Select an area in the Framebuffer to copy the color settings.

size = 4000

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.

yanse=[0]
a=0
r=0
g=0
b=0

uart = UART(3, 115200)
def find_max(blobs):
max_size=0
for blob in blobs:
if blob.pixels() > max_size:
max_blob=blob
max_size = blob.pixels()
return max_blob

while(True):
img = sensor.snapshot() # Take a picture and return the image.

blobsr = img.find_blobs([red_threshold])
blobsg = img.find_blobs([green_threshold])
blobsb = img.find_blobs([blue_threshold])
if r==0:
    if blobsr:
        max_blob=find_max(blobsr)
        if max_blob.pixels()>size:
            yanse.append(1)
            uart.write("1")
            r=1
            img.draw_rectangle(max_blob.rect())
            img.draw_cross(max_blob.cx(), max_blob.cy())
if g==0:
    if blobsg:
        max_blob=find_max(blobsg)
        if max_blob.pixels()>size:
            yanse.append(2)
            uart.write("2")
            g=1
            img.draw_rectangle(max_blob.rect())
            img.draw_cross(max_blob.cx(), max_blob.cy())
if b==0:
    if blobsb:
        max_blob=find_max(blobsb)
        if max_blob.pixels()>size:
            yanse.append(3)
            uart.write("3")
            b=1
            img.draw_rectangle(max_blob.rect())
            img.draw_cross(max_blob.cx(), max_blob.cy())


if r==1:
    if g==1:
        if b==1:
            a=yanse[1]*100+yanse[2]*10+yanse[3]
            print('you send:',r,g,b,a)

行了，我把镜头移动一下对正就好了

为什么我把小球放在镜头正前方，都快把小球堵住整个镜头了，但上位机图像中的小球是偏左的。
小车追小球时，小球也是偏小车左侧的