import sensor, image, time,pyb
yellow_threshold =(0, 100, -128, 127, 47, 21)
RED_LED_PIN = 1
BLUE_LED_PIN = 3
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(30) # Let new settings take affect.
sensor.set_auto_whitebal(False) # turn this off.
#关闭白平衡。白平衡是默认开启的，在颜色识别中，需要关闭白平衡。
clock = time.clock() # Tracks FPS.
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 blobs:
#如果找到了目标颜色
for b in blobs:
#迭代找到的目标颜色区域
# Draw a rect around the blob.
img.draw_rectangle(b[0:4]) # rect
#用矩形标记出目标颜色区域
img.draw_cross(b[5], b[6]) # cx, cy
#在目标颜色区域的中心画十字形标记
print(b[5], b[6])
print("You're on camera!")
pyb.LED(BLUE_LED_PIN).on()
img = sensor.snapshot()
img.save("example2.jpg") # or "example.bmp" (or others)
pyb.LED(BLUE_LED_PIN).off()
print("Done! Reset the camera to see the saved image.")
print(clock.fps()) # Note: Your OpenMV Cam runs about half as fast while
# connected to your computer. The FPS should increase once disconnected.
