#!/usr/bin/env python
# -*- coding: utf-8 -*-
import cv2
import numpy as np

eta=1.0

cv2.namedWindow("preview")
vc = cv2.VideoCapture(0)

vc.set(3,1024)
vc.set(4, 768)
vc.set(cv2.cv.CV_CAP_PROP_FPS, 1)
print vc.get(cv2.cv.CV_CAP_PROP_FPS),'fps'
if vc.isOpened(): # try to get the first frame
    rval, frame = vc.read()
else:
    rval = False
    quit()

wframe=frame

while rval:
    wframe=wframe*(1.-eta)+frame*eta
    iframe=np.uint8(wframe)
    cv2.imshow("preview", iframe)
    rval, frame = vc.read()
    key = cv2.waitKey(20)
    if key%256 == 27: # exit on "ESC"
        break
cv2.destroyWindow("preview")