想X=70,Y=20高=210，宽=200的区域内进行颜色识别

import sensor, image, time
from pyb import UART
uart = UART(3, 9600)

sensor.reset()                      # Reset and initialize the sensor.
sensor.set_pixformat(sensor.RGB565) # Set pixel format to RGB565 (or GRAYSCALE)
sensor.set_framesize(sensor.QVGA)   # Set frame size to QVGA (320x240)
#sensor.skip_frames(time = 2000)     # Wait for settings take effect.
sensor.skip_frames(10)
clock = time.clock()                # Create a clock object to track the FPS.
sensor.set_auto_whitebal(False)
red_threshold_01 = (90,100, -14, 17, -22, 15)
ROI=(70,20,210,200)
while(True):
    clock.tick()                    # Update the FPS clock.
    img = sensor.snapshot()         # Take a picture and return the image.
    statistics=img.get_statistics(roi=ROI)
    blobs = img.find_blobs([red_threshold_01], area_threshold=70)#Less than that area will be filtered out 
    if blobs:
       # print(blobs)
        for b in blobs:
            img.draw_rectangle(b[0:4])
            img.draw_cross(b[5], b[6])
            #m=[b[5],b[6]]
            #b[5]=231
            #m=int(b[5])
            m=str(b[5])
            m=m+'d'
            n=str(b[6])
            m=m+n
            m=m+'sp'
            #m='3sp'
            print(m,b[5])
            uart.write(m)
   # print(clock.fps())              # Note: OpenMV Cam runs about half as fast when connected
                                    # to the IDE. The FPS should increase once disconnected.

import sensor, image, time
from pyb import UART
uart = UART(3, 19200)

sensor.reset()                      # Reset and initialize the sensor.
sensor.set_pixformat(sensor.RGB565) # Set pixel format to RGB565 (or GRAYSCALE)
sensor.set_framesize(sensor.QVGA)   # Set frame size to QVGA (320x240)
sensor.skip_frames(time = 2000)     # Wait for settings take effect.
clock = time.clock()                # Create a clock object to track the FPS.
red_threshold_01 = (91, 100, 127, -9, -20, 20)

while(True):
    clock.tick()                    # Update the FPS clock.
    img = sensor.snapshot()         # Take a picture and return the image.
    blobs = img.find_blobs([red_threshold_01], area_threshold=150)
    if blobs:
       # print(blobs)
        for b in blobs:
            img.draw_rectangle(b[0:4])
            img.draw_cross(b[5], b[6])
            m=[b[5],b[6]]
            print(m)
            uart.write(m)
    print(clock.fps())              # Note: OpenMV Cam runs about half as fast when connected
                                    # to the IDE. The FPS should increase once disconnected.