使用raspberry pi 相機模組捕捉畫面

首先要啟用相機，開啟pi終端機下
sudo raspi-config

智能相機，之後pi版會要求重開機，就可使用

# import the necessary packages
from picamera.array import PiRGBArray
from picamera import PiCamera
import time
import cv2

# initialize the camera and grab a reference to the raw camera capture
camera = PiCamera()
camera.resolution = (160,120)
camera.framerate = 32
rawCapture = PiRGBArray(camera)

# capture frames from the camera
for frame in camera.capture_continuous(rawCapture, format="bgr", use_video_port=True):
        # grab the raw NumPy array representing the image, then initialize the timestamp
        # and occupied/unoccupied text
        image = frame.array

        # show the frame
        cv2.imshow("Frame", image)
        # clear the stream in preparation for the next frame
        rawCapture.truncate(0)

        # if the `q` key was pressed, break from the loop
        key = cv2.waitKey(1) & 0xFF
        if key == ord("q"):
                break

參考資料： http://www.pyimagesearch.com/2015/03/30/accessing-the-raspberry-pi-camera-with-opencv-and-python/ http://picamera.readthedocs.org/en/latest/recipes1.html#capturing-to-a-stream