Benchmark PiCamera vs. OpenCV

camera_benchmark.py

from picamera import PiCamera
from picamera.array import PiRGBArray
import time
import cv2

WINDOW_NAME = 'benchmark'
FRAME_COUNT = 100
FRAME_RATE = 30

camera = PiCamera(framerate = FRAME_RATE)
time.sleep(2)
camera.resolution = (640,480)
rawCapture = PiRGBArray(camera, size=camera.resolution)
start = time.time()
for frame, i in zip(camera.capture_continuous(rawCapture, format="bgr", use_video_port=True), range(FRAME_COUNT)):
    image = frame.array
    rawCapture.truncate(0)
    cv2.imshow(WINDOW_NAME, image)
    cv2.waitKey(1)
camera.close()
print("Time for {0} frames: {1} seconds".format(FRAME_COUNT ,time.time()-start))

time.sleep(2)

cap = cv2.VideoCapture(0)
cap.set(cv2.CAP_PROP_FRAME_WIDTH,640)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT,480)
cap.set(cv2.CAP_PROP_FPS, FRAME_RATE)
start = time.time()
for i in range(FRAME_COUNT):
    success, image = cap.read()
    if success:
        cv2.imshow(WINDOW_NAME, image)
        cv2.waitKey(1)
cap.release()
print("Time for {0} frames: {1} seconds".format(FRAME_COUNT, time.time() - start))