example

def process_motion(frame):
    start_time_tst = time.time()
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    fgmask = bgs.apply(cv2.GaussianBlur(frame,(21,21),0))
    mn = np.mean(fgmask)
    if mn <20.0 and mn > .5:
        #keypoints = detector.detect(fgmask)
        # Draw detected blobs as red circles.
        ret, thresh = cv2.threshold(fgmask, 200, 255, 0)
        thresh = cv2.GaussianBlur(thresh,(21,21),0)
        contours, hierarchy = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)

        for cnt in contours:
            (x,y),radius = cv2.minEnclosingCircle(cnt)

            center = (int(x),int(y))
            radius = int(radius)
            area_circle = (radius ** 2) * math.pi
            area = cv2.contourArea(cnt)
            if  radius < 500 and radius > 30 and area > 0.3 * area_circle:
                tmp_bee = Bee(_is_input=True, start_point = (x,y), rect = (x - radius, y - radius, 2*radius, 2*radius), img = frame)
                #s_log("detect bee")
                is_need_add = True
                tmp_point = (x,y)
                for b in g_bees:
                    if b.is_input == tmp_bee.is_input and ( equals_centroid(b.start_point, tmp_point) or equals_centroid(b.end_point, tmp_point)) :
                        b.change((x, y), (x - radius, y - radius, 2*radius, 2*radius), img = frame )
                        is_need_add = False
                        break
                if is_need_add:
                    g_bees.append(tmp_bee)
                pass