import cv2
from numpy import *
from scipy.signal import *

def nothing(x):
    pass


def test_estimate_delta(a,b, wid):

    cap = cv2.VideoCapture(0)
    flag = False
    while True:
        ret, v = cap.read()
            frame = frame[:,::-1]

        lst = []
        h = ones((a,a))
        for i in xrange(0,255):
            tmp = fftconvolve(where(v >= i, 1,0),h, mode="same")
            lst += [tmp]
        f = array(lst)
        d = arange(len(f))[:,None,None] * ones(f.shape)

        thresh = where((f <= b + wid) == (f > t - wid), d, 255).argmin(axis=0)
        thresh = where(thresh == 0, 255, thresh)

        v = where(v > thresh, 255, 0).astype(uint8)


        cv2.imshow("Movie", v)

        k = cv2.waitKey(1)
        if k == 27:
            break

        cap.release()
    cv2.destroyAllWindows()
capture_camera()